Cupola Casting Information

Metal Casting

A Cupola is a type of furnace that is very much alike to blast furnace. The Cupola furnace is refractory lined, stack of steel that is around 20 to 35 feet high. It rests on a base plate that is made of cast iron and has four legs. The casting that is obtained from the cupola furnace is known as a cupola casting.

Cupola Furnace: The Cupola Metal Casting furnace is one of the oldest forms of furnace that have been used by the iron and metal foundries. Most of the industries are aware and have used the Cupola furnace as it is the curdest and simplest furnace in the industry. However, the cupola’s use is declining and the furnace is fast being extinct.

Merits of the Cupola Casting Furnace: Though the electric or the blast furnace has started replacing the Cupola Furnace, it has some special benefits of its own. Whats nice about the Cupola furnace is that is usually can be running continuously. The furnace also offers a very high melting rate. The most important merit of the furnace is that it has relatively very low melting cost. The furnace has also permits a lot of ease of operation.

However, due to the invention and development of the electric furnace, the use of Cupola furnaces has substantially declined. The electric furnace melts a much larger amount of metal. The operation cost of the electric furnace is also very low. The electric furnace also emits a much smaller level of smoke heat and also pollutants.

Construction of the Cupola furnace: The Cupola furnace is constructed in a crude and simple manner. The Cupola Metal Casting furnace is a vertical structure like a steel shell. The steel is lined with refractory bricks from the inside. The furnace has an opening half way in the vertical shaft. The charge is introduced through the opening. The charge is divided into different layers. This is the place where the metal is contained that is inline to be melted. The metal is mixed with coke, fuel, and lime stone flux. The fuel is burnt directly into the air and is introduced in to the furnace through the tuyeres which are positioned above the hearth. The hot gases that have been produced ascend and pre heat the charge.

The cupolas in majority of the cases have drop down doors. The bottoms can be dropped down to facilitate the cleaning and the repairs. At bottom in front of the furnace is a tap hole. The molten metal is removed from the tap hole. Sometimes at the botton or rear there is another hole for slag to escape. A fume arrester or what is known as a spark is on top of the stag.

Usually the cupola has a diameter of 405 to 2000 mm. It is operated on varying fuels for different metal ratios. The molten metal that can be produced in the copula of this size at a speed of 1 to 30 tones per hour.

Inline of the Process: The charging is stopped once the process of melting has been finished. However, the blast of hot air is always maintained till all the metal has been melted and has been taken out from the tap hole. When the air cools down, the doors at the bottom are opened and the residue that has been left behind is removed.           

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Resin Casting Information

Metal Casting

Resin Casting is a system of technical installation that is used in the process of casting resin. The process of Resin Casting is a complex process that is used in a variety of fields. If you have a product and you are concerned about high quality and precision, then resin casting is the way to go.

Need for Resin Metal Casting : Resin casting is used to obtain a high level of quality and also precision in the dimensions of the product. Resin casting is basically used in the process of miniaturization i.e. the process of making things small. The process of Resin Casting is also used extensively the field of electronics. The electronics industries today resort to the resin castings to achieve the norms of total quality management.

The process of resin metal casting earned success and also gained popularity in the field of electronics because it facilitated the acute miniaturization process and also at the same time maintained a high level of quality. The electronics industry is a very demanding field in terms of quality and cost. Experts recommend that the process of resin casting is an ideal way to achieve the required quality and it also helps cut down the cost of production. The process is also highly productive and also reliable with respect to speed.          

Industrial Applications of Resin Casting: The process of resin casting is basically used in the electronics industry. Resin Casting is used in the production of transformers, Liquid Crystals Displays more commonly known as the LCD’s. It also used in the manufacture of heavy electronic systems.

Important steps in Resin Metal Casting : The process of resin casting is completed in basically five important steps. The first step is to condition the resin, and then the material is transported. After the transportation of the material the three most important steps are executed. First the material is metered, then the material is mixed and then finally it is dispensed.

Conditioning process: The process of conditioning in the resin casting evenly distributes the fillers ion the mixture. The conditioning also eliminates the moisture and air. It also makes the mixture constant, and also elevates the temperature of the mixture. The process of conditioning also maintains a low viscosity in the mixture. This process is very important for complex combinations as it intensifies the quality of the product.

Process of Material Transportation: In the process of transportation of the materials, the piston pumps, screw pumps, and the gear pumps are used. For the highly viscous substances, instead of gear pumps, follower plate pumps are used.

Mixing Process: This process is very important as it is mean to be used to obtain an equal and stabilized reaction through all the materials. The most commonly used methods in the mixing are the static mixing tube, the dynamic blender, and the dynamic static mixing tube.

Dispensing process: The process of dispensing is the most important process in the Resin Casting . The dispensing Unit and the movement of the part are actually relative to one another in the dispensing process.

There are a few ways that Resign can be dispensed and casted and these processes could be a metering system or maybe even a vacuum dispension. In the industrial to cut costs and also time multiple dispensing units are used.          

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Learn about the basics of Green Sand

Metal Casting

Green Sand: Green sand is also called as foundry sand or molding sand. This is utilized for sand Metal Casting . When this sand is oiled or moistened, it has a tendency to pack well and retain the shape. Green Sand is made up of three things: Pulverized Coal, Water, and Bentonite Clay and Sand. Out of these four components, the biggest part is that of the sand.  There are several proportions of these four components. The different ratios are used to adjust the surface finish, moldability and capacity of the hot molten metal to degas. The prime use of this sand is in the Metal Casting . The coal is usually called as sea coal in foundries. Sea Coal and the amount of Sea Coal is less than five percent. It undergoes partial combustion when there is molten metal present and this causes offgassing of organic vapors.

Green sand is stored in flasks (as the casters call the container). These are boxes that do not have a bottom or lid. This box is divided into two half parts and these are connected together. These halves are called as the top or cope and bottom or drag flask.

As per its name, green sand is not green in color. The word “green” is used as it is used in the wet state.

Casting Sand: Some Casting sands are oil bonded and foundry mix sand. This is a mixing of oil, resin and sharp fine silica sand. Such a mix can be utilized in sand casting of all varieties of metals. Some casting sands consist of 20 percent more oil and resin as compared to other brands. What you are trying to do is to find the best mix that will have good freen power and a very good finish.

The oil bonded sand is a substitute for water bonded green sands to be used for casting sand. The advantage over traditional, older sands is that as water is absent, the sand does not steam like the traditional sands. This sand is more secure to use than green sand. The reason is that potentially explosive quantities of steam are not generated. Due to this dearth of steam generation and the smooth texture of the sand, the oil bonded sand results in a smoother surface finish. The novice can use these sands and get professional results.

Use of casting sand: The same techniques, patterns and tools that are used for water bonded sands can be used for oil bonded casting sands. As the sand has better adhesive properties, there are fewer hassles with loose sand in the impression. The difference is that water cannot be used to manage loose sections. However, as the self adhesion is better, there are fewer problems of crumbling.

When the oil comes in contact with molten metal, it does not burn. When the castings are being shaken out, it is advisable to take off the sand that is burned. This sand that is burned can then be mixed again in the pile of fresh sand. It reabsorbs oil and works very well. After repeated use of this sand, the oil gets depleted. In this case, around 30W of non-detergent motor oil can be used to reload the sand with oil.

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Information on Metal Casting Crucibles

Metal Casting

A pot in which metal is held, while melting in a furnace is called as a “Crucible.” It is made of silicon carbide and clay graphite.

Shapes of a Crucible: If you are looking for a crucible that has the shape of a barrel then you need to find a Blige Shape Crucible. The part of the crucible in the middle region is called as a bilge. This is the widest part of the crucible and has the maximum diameter. The top of the Casting crucible has lesser diameter than the bilge. The base of the crucible has lesser diameter than the top. As per a thumb rule, the # of a bilge crucible is the number of pounds of aluminum that it would hold. For bronze and brass, thrice the # can be held. For instance, a #5 bilge crucible can hold almost 5 pounds of aluminum and 15 pounds of brass. This thumb rule is applicable for bilge shape only.

If you are looking at an "A" shaped crucible, you will see that it has a narrow bottom and a wider top so that it looks like the shape of an "A". What these are are straight sides that are somewhat bent outwards. The diameter continuously increases from the base to the top. As it is simpler to manufacture this shape than the bilge one, the A shaped crucible has a lesser cost. When compared with the equivalent bilge style, the capacity of the A shaped crucible is lesser.

Both the above mentioned shapes can be manufactured in Clay graphite and silicon carbide.

Properties of crucibles: A crucible must be able to bear the extremely high temperatures of the molten metal. For this, the melting point of the material used to create the crucible must be more than the melting point of the metal that in placed in the crucible. Also, the crucible material must have excellent strength even in the white hot state.

For melting metals like aluminum and zinc, a steel crucible made at home can be used. The reason is that the melting point of aluminum and steel is lesser than steel. In this case, the interior surface of the steel Metal Casting crucible undergoes flaking or scaling. Due to this scale, the molten metal is polluted. The thickness of the crucible walls decreases fast. Hence, a coating of marcote-7 is applied to the inner surface of the steel crucible. The use of steel crucibles is okay if the contamination due to the scales is not regarded serious.

Materials used: To construct a Casting crucible, the usual refractory materials (i.e. carbon bonded silicon carbide and clay graphite) can survive the extremely high temperatures of work of a foundry. In addition, silicon carbide is a very durable material.

Some of the clay graphite crucibles can be used up to 2750 degrees Fahrenheit. Some A shaped crucibles are used up to 2000 degrees Fahrenheit. These crucibles can be used to handle gold, silver, bronze, brass, aluminum and zinc alloys.

The A shaped crucibles have a rough surface finish and there are dents along the rims. However, this roughness does not interfere with the performance by any means.

While handling crucibles, correctly fitting tongs must be used. In correct tongs can lead to damage or total failure of the crucible. There really must be a piece of the cardboard that is inbetween the base of the furnace and the crucible.

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What kind of Casting Tools Do you need

Metal Casting

There are various types of Casting tools. Provided below are details of some of the casting tools.

Esmarch plaster scissors: These are German stainless steel cast scissors of high quality. The entire length is 20 centimeters or 8 inches. There is a 6 centimeters slanted blade for safety of the patient. The handle for leverage is of 15 centimeters. This is perfect to cut the inner layers of synthetic cast materials or plaster.

Good stainless steel scissors are really what you want for casting and the best ones are Lister Bandage Scissors. The size of the blade is 5.5 centimeters. It resists rust and corrosion. This scissors are perfect to remove QuickCast splints and casts.

Cast scissors for serial finger casts: These are manufactured from German stainless steel of highest quality. Nine Centimeters ends up being tht total length. There is a 1.3 centimeters slant design on the cutting surface. During cast removal, there is good patient safety and the scissors offer excellent force.

Metal Casting spreader: This has a stainless steel construction. There is a spring loaded handle to facilitate use.

Metal Casting breaker: The length of the cast breaker is seven inches. This is an O.R. quality German instrument. This is used for lightweight cast breaking and trimming. This has deep serrated tips and is free of latex. The cast breaker is available in sizes of 9.5 inches also.

Plaster and Utility shears: The length of this instrument is 8 inches. This is a German instrument of O.R. quality. There is a spring loaded handle design that decreases the hand fatigue. This is very efficient in case of cotton or cloth wadding. It is free of latex.

Wire suture scissors: This is a stainless steel scissors of high quality. This is a perfect device to remove finger serial casts and to make tight corner cuts.

Fiskars all purpose snips: This instrument has a positive safety latch, a stainless steel spring and a comfort grip. The design is such that there is maximum power and handling ease. It is important that the blades have a very high quality stainless steel blades so they can cut a variety of materials. Low temperature thermoplastics can be cut at room temperature by this device.

Aviation snips: These snips are of industry quality. Non-heated splinting material can be cut with efficiency. It can be used to cut straight lines as well as wide curves. The handles are coated with plastic to increase the comfort. This device can be used in the left hand as well as right hand.

Softouch spring action scissors: Those who have weak hands can also operate these by employing half the effort. There is a gray cushion grip. This is used to provide relief to the finger and thumb discomfort. It also absorbs squeezing pressure. The handle can be easily gripped and used in the left hand or right hand. There is a gentle spring action to open blades at the end of each cut. This offers relief to the hand and joints. There is a large slide lock for single handed operation. This also maintains the blades closed for portability and safe storage. It is free of latex.

Cast stand: The height can be adjusted. This comprises of a drip bucket. While the limb is being casted, it provides support to the arm or leg of the patient.

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Iron Casting Information

Metal Casting

Iron Metal Casting can be referred to as products made out of melted iron molecules. These molecules are, first, poured into mold and allowed to cool. They are then extracted. The casting properties depend a great deal on the foundry practice. They also depend on the cooling rate. Iron contains huge carbon concentrations. This content facilitates melting, simplicity of casting, and machining. Iron casting designs have a great variation owing to the property of iron to resist shrinkage during the process of cooling. The end product attains a great reputation for its strength and durability. Tensile strength ranges between 20,000 psi and over 60,000 psi. The values of hardness (without heat treatment) range between 100 and 300 BHN.

Some factors need to be considered while buying iron Casting . The first thing on the agenda should be, checking the quality of foundry used in products and procedures. This should be done because foundry practices determine the casting properties. The consumer might have a tough time in finding the apt one. Secondly, the concentration of carbon should be looked into. The percentage of carbon commonly ranges between 2.5 and 4%. An addition of even 0.1% would cause the tensile strength to decrease by around 2700 psi. As youo can imagine, each foundry is run very differently which means that their casting procedures will be very different if compared to one another.

Green sand molding is the most commonly used type of Metal Casting . Normally, small and medium sized products are produced using this type of casting. Shell molding is preferred for bigger applications. Shell molding facilitates cooling of the mold containing heated metal. This process gives a better finishing to the final product as compared to all the other processes. Centrifugal casting is used for producing big cylinders and pipes. Both, producer and consumer would get highly satisfied if a proper blend of correct casting process and reputed foundry is made.

Iron castings are utilized extensively in machinery, automotive, and agricultural industry. Parts such as turbine and pump housings, dynamometer bases, compressors are made out of iron castings. Majority of manufacturers have the caliber to go for high and low production outputs. They are also entitled to go for short order runs. To give the customer the highest accuracy and quality there are standard prototypes that should be used. Some manufacturers provide finishing services like galvanizing, painting, and machining as well. In general, iron castings include alloy casting, ductile castings, and malleable castings. There are some terms relating to iron castings. They need to be known in order to get a fair idea of iron.

Brinell Hardness Number (BHN): It can be defined as the method used for measuring the hardness of iron. For iron castings, a metal ball of 3000Kg is put on a flat iron piece. After the removal of ball, indentation observed is recorded. This measurement indicates the value of hardness.

Tensile Strength: Tensile strength can be defined as the quantity of bending and stretching undergone by a material before tearing or breaking. Here the metal is iron.

Modulus of Elasticity: It can be defined as the ratio of stress to strain. This value determines the elasticity as well as the stiffness of the concerned material.

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Metal Casting Molds and Learn About Making Molds for Metal Casting Information

Metal Casting

Casting molds are an essential part of the metal casting process as it will be used to shape the final result. Nearly all metal casting methods will use some type of mold. The standard mold will consist of a cope and drag that when together is called a flask. The mold itself can be constructed of several materials depending upon the DIY Casting method.

Most molds will be made from latex, fiberglass, sand, and even metal. A lot of times you will see Sand being used in DIY Home Foundries and therefore Sand Molds are some of the most popular molds. In Permanent Mold Casting, the mold is created from metal. Most molds can be used over and over again, but not all of them. Certainly the metal molds can be used multiple times without loosing any quality from the finished product. However, molds created using sand or other materials will not have a very long shelf life. This is not generally seen as a huge problem just a minor annoyance since mold making is relatively cheap and easy.

No matter what material the mold is made from, the basic construction is pretty much the same. The molding box is called the flask which has a cope, the top, and drag, the bottom.  You will then fill the flask with the molding material and then place the original into the mold. So, if you want to cast a tiny metal elephant, you will place an original of the elephant usually made from clay, wax, wood, or even metal into the drag of the flask. If this is done in sand you will ram the flask until the sand is packed tightly around the original. The top of the flask, the cope is then placed on and more molding material poured in. The entire flask is then rammed or vibrated making sure everything is packed in nice and tight.

After you have waiting for a long time until the molding material is very dry, and then you can get rid of the mold and retrieve the original. Now, if you want to make sure that there are some empty spaces in the cast to be finished then you will place cores into the mold. The cores are made of sand or wax.

The type of mold used depends heavily on the type of Metal Casting , alloy, and complexity of the pattern to be cast. Metal molds have little use in small foundries unless you plan on casting a lot of tiny metal elephants.

In some cases, pre-made molds can be found in hobby shops or through company casting companies. Usually, pre-made molds are used in miniature castings. Many individual metal casters prefer to make their own molds since it is inexpensive and allows them greater control over the finished casting.

DIY Casting involves several sets of skills and mold making is one of these skills. Eventually, all metal casters must learn to obtain the skill for making molds as this is very important to the casting process. Not only are molds used in metal casting but in other casting types as well. Resin casting and other plastic casting requires a mold as well. The flask can be made of wood, metal, and in some cases those toy building blocks, we all know the type. What you are really looking for is something that can hold the mold material until it dries and if the fllask can do this, then it can be used.

Every metal caster should learn how to make a mold instead of relying on others. Independence is one thing that this is all about, but the other is also that this will help you save lots of money. Making your own mold is just cheaper.

 
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What Metal Casting Supplies are Needed for Metal Casting

Metal Casting

Some of the Metal Casting supplies are described below.

Cast cutters and blades: There are two varieties of cast cutter blade for plaster casts – 2 inches and 2.5 inches. This comprises of one blade and in most of the cutters, stainless steel blades fit in. This has a maintenance free operation and is comfortable to use. There is a high torque motor and an ON / OFF switch. The Cast cutter blade for synthetic casts is also available in two sizes – 2 inches and 2.5 inches. This has the same features as mentioned above. The Hercules Plaster Shears 7.5 inches is a Hercules heavy duty bandage and plaster shears 7.5 inches (19.1 cm) and has a serrated blade. The Cast cutter heavy duty with metal housing consists of one 2 inches fiberglass blade. In most of the cutters, a stainless steel blade can be fitted. Twelve is the length.5 inches and weight is 3 lbs 13 oz. This is specially lubricated for greater service and more comfort. The heavy duty can be used in both clinical use and fabrication setting.

Cast padding: The specialist Metal Casting padding 3 inches X 4 yards is made up of micro pleated cotton fabric that stretches more than 50 percent. There is no need to tear and tuck for a smooth and comfortable fit. This is also available in sizes of 4 inches X 4 yards as well as 2 inches X 4 yards. The Sof Rol padding 3 inches X 4 yards is made of 100 percent surgical grade rayon. This is also available in sizes of 2 inches and 4 inches X 4 yards.

Metal Casting splinting materials: The orthoplast II splint material plain is available in size of 18 inches X 24 inches X 1/8 inch. The setting time is 3 to 4 minutes. The finished splints can be butt bonded, hinged, bonded, strapped and riveted. There is a wax coated surface. This is self adhering when heated. This is majorly designed for upper extremities. Hand Splints is where this really comes in handy. It moulds as per the contours of the body without any wrinkling. The orthoplast splinting material plain is available in sizes of 18 inches X 24 inches X 1/8 inch. This is made of a low heat thermo plastic material and is highly comfortable. After this material is heated, it can be molded or cut to any shape and adheres to itself. This material can be butt bonded, hinged, bonded, strapped and riveted. This can also be used in cylindrical casting procedures.

Heat gun: This is of two types – heat gun and master heat gun 220 volt.

Splinting pans: The forma splint 14 inches X 10 inches is an extremely compact and lightweight design. So, it is perfect for small splinting needs or for varying spots. This has a stainless steel working tank of dimensions 13 inches X 9.5 inches X 1.25 inches. This has a lexan cover. Water is maintained at controlled temperatures by a variable temperature thermostat between 150 degrees Fahrenheit and 190 degrees Fahrenheit. There is a high heat safety switch and grounded hospital grade plug. The empty weight of this device is 5.5 lbs. The Required Temperature is reached in only around 15 seconds.

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Aluminum Information

Metal Casting

Aluminum is amongst those metals which can be ‘cast’ by every process used in metal casting. These processes, in descending order of quantity of aluminum  casting are: die casting, permanent mold Metal Casting , sand casting, plaster casting, investment casting, and continuous casting. The Metal Casting process is selected on the basis of factors such as cost, feasibility, quality, etc.

One should not be concerned about these methods as they are all very simple and feasible. However, the most suitable casting method can be decided according to the design features or dimensions.  For instance-Large products are made using sand casting. The quality factor is also important in selecting the casting process. Quality refers to both, mechanical properties (ductility and strength) and soundness (surface imperfections, cracking, and porosity freedom).

The methods most commonly used can be described as follows:

Die Metal Casting : As per the statistics, around $2.Its been said that each year in the united states, there are about 5m worth of die castings of aluminum alloys produced. The process of die casting utilizes almost two times the tonnage of aluminum  alloys as the combination of other casting processes. Die casting is best suited for large quantity production of relatively tiny parts. Aluminum die castings upto 50 Kg of weight can be produced if casting-machine costs and high tooling are justified.

Some common applications of die cast aluminum  alloys are inclusive of alloy 380.0 for Lawnmower housings, Alloy A380.0 for streetlamps housings, dental equipment, typewriter frames, Alloy 360.0 for frying skillets, instrument cases, cover plates, parts needing corrosion resistance, Alloy 413.0 for outboard parts of motor like connecting rods, pistons, housing, and Alloy 518.1 for conveyor components, escalator parts, aircraft, marine hardware.

Die castings cannot be easily heated or welded due to entrapped gases. Efforts are being on the war footing to overcome this obstacle. The die castings of aluminum  alloys are generally produced using aluminum -silicon-copper alloys. This alloy family gives an excellent combination of corrosion resistance, strength, and cost, along with respite from ‘hot shortness’ and high fluidity which are mandatory for easy casting. If one desires a better resistance to corrosion, he should make use of alloys having a lower copper content.

‘Permanent Mold’ casting: ‘Permanent mold’ casting is best suited for high-volume production. Their size is larger than ‘die castings’. These castings have a very low pouring rate. They are gravity-fed. Outstanding mechanical properties are exhibited by ‘permanent mold’ castings. There is a lot of scope for further improvement if they are given heat treatment.

If you are looking for some of the most common alloys of aluminum permanent mold casting is the alloy 366.0 for automotive pistons, Alloys 355.0, A357.0, C355.0  for impellers, timing gears, compressors, missile and aircraft components, Alloys A356.0, 356.0 for aircraft wheels, parts of machine tools, pump parts, valve bodies, marine hardware, and 296.0, 333.0, 319.0.

Sand casting: This type of casting involves formation of casting mold (with sand). It is inclusive of conservative sand casting & lost-foam casting. The first one involves forming a pattern of sand, pouring the molten metal into it and breaking it once the product is formed. The foam that goes into the mold in the lost foam pattern process should be assumed that the foam is dispensable. The rest of the procedure is the same as conservative sand casting.

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Learn about the basics of Brass Casting, types of Brass Casting, and the process of Brass Casting

Metal Casting

Brass Casting , as the name suggests, involves the use of brass as the molten metal. Brass casting can be carried out by the way of sand Metal Casting only. Sand casting can be defined as a ‘cast part’ produced by formation of a mold from a mixture of sand and pouring the casting liquid (mostly molten metal) into mold. Then the air-cooling of the mold takes place. It is only after the metal is solidified that the removal of the mold can take place. The metal used here is brass. It is a known fact that brass is an alloy of copper and zinc. Hence, to be precise, the molten metal consists of two elements. 

Sand molding consists of two types- ‘Green sand’ molding and ‘air set’ molding. The first one consists of a blend of moisture, clay, silica sand and other additives. The second one makes use of dry sand bonded to all the above materials except moist clay, by the way of using an adhesive, which is fast curing.

At times, there is a placing of a temporary plug (in the mold cavity) to enable the formation of a channel to pour the fluid which is to be molded. The molds of the second type, i.e. Two part molds are produced with molds are formed by the air-set process. The two parts are bottom and top. The tamping-down of the sand mixture takes place as it gets added. Many a times, the final assembly of the mold is vibrated to get the sand compacted and get the unwanted voids filled. Then the molten alloy (brass) gets poured into mold. After the solidification and cooling of brass, the separation of casting from sand mold takes place. Normally, such molds are one-time usable.

Metal Casting Patterns: These are made by a desinger whom the engineer has given the design for the object that will be made. On the basis of this design, a pattern is built by an efficient pattern maker by the use of plastic, metal, or wood. Polystryene is another good choice and can aslo be used. The casting brass would get contracted during solidification. If you are wondering, sometimes non-uniformity can also cause this. Therefore, the size of the pattern should be a bit larger as compared to the final product. ‘Contraction Allowance’ is the name given to this difference. Brass enters the mold cavity through a runner system including sprue and other feeders.

Molding box: A molding box having multiple parts (also known as casting flask whose bottom and top halves are called drag and cope respectively) is constructed for receiving the pattern. There may be an addition of sand to nullify the defects introduced due to the pattern getting removed.

Chills: To have a proper control over metallurgical structure and solidification of brass, plates of brass, or any other metal can be placed in mold. Its at these particular spots that a very hard structure may be formed. Chills can be used for promoting directional solidification as well.

Design Requirements: The thing in making and the pattern corresponding to it should be designed in such a way that every stage of process can get accommodated. One should be able to take away the pattern without causing any disturbance to molding sand.

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How does the Lost Foam Casting Process Work

Metal Casting

Lost Foam Metal Casting is a sub type of Investment Casting. This type of casting method uses foam pattern as the investment. This method benefits from the advantages of the foam properties helpful to make simple and cheap castings. These types of simple castings are impossible using the regular cope and drag method.

Here are the details of the Casting Process:

Foam Shaping: The original foam pattern of the Polystyrene is generally molded or carved.

Carving Polystyrene: You will want to used some older carving tools that you see around various shops or maybe a new age hot wire cutting tool in order to cut the formed foam. It can also be sanded easily.

Injecting Polystyrene in a Mold: Polystyrene contains pentane as a blowing agent and is commonly used for beads. The beads are pre-extended, stabilized and then blown into the mold to form pattern sections. A steam cycle forces the beads to expand fully, after this the fuse together and then it undergoes an in-mold cooling cycle. The final shape if very complex, then it is molded in sections. A cluster is formed by aging and gluing together the shaped foam sections. 

Preparing Final Mold (Investment) for Metal Casting : Gates and Raisers are generally attached to the pattern, they are also the part of the casting as this helps reduce the shrinkage. If you think of how you are going to coat the foam you probably will want to use either pouring, dipping, or spraying as your method of choice. The reason for this coating is that it forms a barrier and helps to prevent the molten metal to penetrate or cause sand erosion while pouring. Structural integrity of the casting is protected thanks to the coating. The cluster when dried is backed up with un-bonded sand and is placed in a flask. Proper and uniform compaction is then achieved by performing mold compaction using a vibrating table. Finally, after a lot of detailed work and proper compaction you can now pour into the mold.

Automatic pouring is the preferred method in Lost Foam Metal Casting . This is the most critical process and also a bit difficult than the traditional foundry practice. As there are no parting lines or fins to remove the cleaning is easier and requires far more less time and operations in the Lost Foam Casting process.

Advantages of Lost Foam Casting: Due to its unique properties, foam is easy to carve glue and manipulate. It also provides accurate dimensions as Lost Foam Casting is more accurate and effective than sand casting. There are no fins or parting lines the finishing process is easy and less time consuming. The elimination of cores makes complex casting designs easy. Lost Foam Casting also allows us to control the wall thickness and thus no core prints are required thus eliminating shifts or fins and also saves the trouble of sand mixing and core defects. As there are no drafts multiple levels of casting is possible. Precise gate and riser replacements are achieved. What is nice about Lost Foam Casting that sometimes, it is much easier to to cast items in this way versus other types of casting methods.  Due to simpler process and easy finishing work, the process is very cost effective and lowers the overall price of the final product.

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Learn about the basics of Lost Wax, types of Lost Wax Casting, and the process of Lost Wax Casting

Metal Casting

Lost Wax Metal Casting is known as Cire Perdue in French. This is a very important process where a scuplture made by an artist is used to cast bronze. The Lost Wax Casting method is also known as  Investment Casting in the modern industrial world. A long time ago in ancient times, this method was used to cast small bronze sculptures but as it has evolved today, it is used to make a lot of different things and each foundry uses the process differently. Today this developed method of Lost Wax Casting is used to make articles like fine jewelery, show pieces, dental restoration, a few specific industrial parts and also some machine tools.

Process of Lost Wax Metal Casting :
 
Rough Sculptor making: A creative artist makes an original sculptor or mold or an artwork by using raw material like wax, plaster of Paris or clay. A mixture of oil based clay and wax is preferred as these materials retain their softness.

Final Mold Making: A mold is then made as per the original sculptor. The mold is made up of two pieces and a key with shim is placed between the two pieces during construction so the mold can be put accurately back together. Molds are generally made using plaster or fiberglass or any other material that may be suitable. An inner mold of latex or vinyl or silicone is put pup preserve the details of the original art work. Generally, the original art work made of plaster mold cracks and breaks during the initial phase of deconstruction. Many a times, numerable molds are required to get the exact replica of the original art work.

Filling up the mold: Once the latex and plaster mold is complete and finished, molten wax is poured into the mold till it gets an even coating all around the mold. The thickness of the wax coating is around 1/8 inch. This process is then repeated until the desired thickness is achieved.

Removal of wax replica: The hollow wax replica of the original art work is then removed from the mold. It would be nice if you could reuse the mold a variety of times but becausee there is significant wear and tear it really can only be used one time.

Softening: Each wax mold is then chased or softened using heated metal tools. The metal tools are rubbed around portions that show cracks or the joining line of the mold, where the pieces have come together. Separately molded wax pieces are then heated and attached. All of the imperfections will now be dressed since the mold is finished. The final piece then looks like a bronze sculpture.

Making paths for molten bronze: It is also known as “spuring”, in short the wax copy is then branched with treelike wax, so that the molten bronze reaches the right parts and also it helps the air to escape. The critical and careful spuring begins from the top of the wax copy. The top of the copy is attached to by wax cylinders to different points on the wax copy.

Slurry, burnout, testing, pouring, release, metal-chasing, and painting are the final steps in the process of Lost Wax Metal Casting .

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Bronze Casting Information and the process of Bronze Casting

Metal Casting

Bronze has been the most sought-after metal for cast metal sculptures in the bygone years. Bronze alloys have a desirable and unusual property to expand slightly prior to their setting. This helps a great deal in filling every corner of the mold. Their ductility and strength causes them to be molded into any form. However, bronze has a basic disadvantage of not being durable. Hence, there are hardly any traces of ancient bronze statues found. Bronze Metal Casting generally takes place by a process called lost-wax casting. Though, centrifugal and sand castings are also employed, around 90% of bronze casting takes place through lost-wax casting.

Lost-wax method: Lost-wax Metal Casting , in the industry, is better known as investment casting. It is costlier than die and sand Casting , but outshines them in terms of accuracy. It is easily possible to make complicated structures through ‘lost-wax casting’. The process can be described as follows:

Sculpting: First, the original artwork is created by the artist from clay, wax, or some other material. Since you really want a material that has a retention of softness you will usually use Clay or Wax.

Mold making: Majority of molds consist of 2 pieces, along with a shim placed between 2 halves at the time of construction in order to put back the mold accurately. The shim area is where the keys are stored. The small sculpture molds generally consist of plaster. Fiberglass can also be used. To have the minute details preserved on the surface of original artwork, there exists a mold inside. It is made up of vinyl, silicone, or latex supported by plaster part of mold. Generally, the destruction of original artwork takes place during making. This is due to the solid nature of the originals. The other reason is the rigidity of the originals at the time of removal of plaster mold. That’s why; the original is cut off into thin, long pieces and separately molded. At times, a number of molds are required for recreating the original structure.

Wax: After the completion of latex-and-plaster mold, the pouring of molten wax takes place. Then, swishing is carried out till a uniform coating is obtained. The thickness of the coating is 1/8 inches. Usually its the inner surface of the mold that gets covered by it. This process is repeatedly executed till the preferred thickness is attained.

Wax removal: Artwork’s ‘hallow wax copy’ is detached from mold. This mold may be reused by the artist for making more copies of wax, but its use gets restricted due to frequent ‘wear & tear’. Around 25 copies can be made for tiny bronze artworks.

Chasing: The chasing of each copy starts. Rubbing of the marks is done by a hot metal tool. The marks showing ‘flashing’ or ‘parting line’ are rubbed out.

Spruing: The spruing of copy generates paths to flow (for molten bronze) and causes air to move out.

Slurry: The dipping of sprued copy into a liquid silica slurry, and then into sand-like ‘stucco’ takes place. If its 1/2 inch that you are going for in your coating, you will want to continue this process until this thickness is obtained.

After these steps, the out-and-out processes like burnout, testing, pouring, releasing, metal chasing, and patinating are carried out.

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Learn about the basics of Die Casting, types of Die Casting, and Advantages of Die Casting.

Metal Casting

Die casting is the method used for forcing molten metal into mold cavities under high pressure. Die Casting is very versatile and hence, is the widest used method for casting a metal. Die casting is same as permanent mold casting the only difference is that the metal is injected into the mould at very high pressure of 10-210 Mpa. This results in a more uniform part, usually good dimensional accuracy and also good surface finish.

The different metals and alloys that can be used in die casting are zinc, aluminum, copper, magnesium, tin and lead. Ferrous metals can also be used for die casting, die casting method is generally used for applications in which a large quantity is medium or small sized parts are required with detail, good dimension and fine surface finish.

There are namely two equipments used for die casting cold chamber and hot chamber process.

Molten metal is a huge part of the cold chamber process as you get to fill a cold chamber of each module with this molten metal. The time exposure provided for the molten metal to plunge the walls of the mold is less. This clod chamber process method is very useful for metals like aluminum, copper and metals that easily alloy with iron at high temperatures.

Hot Chamber process: In the hot chamber process method of Metal Casting , the pressure that is connected to the die cavity is forever and permanently in molten metal. As the plunger moves towards the open position that is towards the non - pressurized area, the inlet port connected to the pressurizing cylinder is uncovered.

The die casting molds which are used in this method are expensive and take usually take long production time. These die casting modules are also called as “dies’

Advantages of Die Casting: The method of die casting gives excellent dimensional accuracy. The dimensional accuracy is as good as 0.1mm for the first 2.5cms and 0.005 for the first inch. Die casting also provides with smooth cast surfaces. Small and thin walls and can be made using the method of die casting walls as tiny as 0.75mm approximately can be casted. Inserts like thread insert, high strength bearing surfaces and heating elements can also be inserted using the Die Casting method. Casting also helps in reducing or even completely eliminating the use of secondary machining operations. The use of Die Casting method also helps to reduce the production time and a huge number of articles can be produced in a very short time. Die casting method also helps to retain as well as increase the tensile strength of the metal. This is what sort of strength this offers as it is as high as 415 MPa and that is about 60ksi.
 
Disadvantages of Die Casting: The casting weight is very less hardly between 30 grams and 10 kgs. Also the size of the material that needs to be casted using the Die Casting method needs to small say around 600mm. the process of Die Casting requires high budget and can pile up high initial cost. Die Casting method makes the metal porous up to some extent. In the Die Casting method the thickest section needs to be less than 13mm or 0.5 inches.

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What is Gravity Casting and how is Gravity Casting Used

Metal Casting

Research and development in Gravity Casting has taken an important step in making metal products a part of our day to day lives. The products used in homes, aircrafts, artifacts, automobiles have become more durable and less expensive. Cast alloy parts are formed by melting the alloy and then pouring it in a mold under heavy pressure or vacuum. Metal Casting is also known as vacuum casting. It is a technique in which large diameter filaments are used with adequate separation. This ensures that no clusters are formed and also good metal wetting of the fiber is guaranteed. This technique was first used in 1970. The gravity casting method has advantages like cost effective, good quality, and process control over other casting techniques.

Gravity casting is done in ceramic molds, sand, permanent casting and also in investment or lost wax casting. The Casting process was started with common steel after successful implementation it was further tried on heat resistance super alloys. With recent development and with more refined methods today even titanium alloys are being cast using the gravity casting method and using ceramic crucibles. The use of desired mold designs and also specially made unique designs enable a reduction in the metal cast to yield the given part. This also helps in reducing the amount of energy that is used in making such casting articles.

With new developments, today even computerized control of the vacuum pressure and rate is possible. What this does is to allow the person using the equipment to control the rate of fill. This makes casting of high quality metals like and viscous metals like metal matrix and composites of aluminum casting possible. This gravity casting method is used to produce casting worth of more than $200 million. The industry is expected to grow rapidly in the coming years due to the increase in production of automotive exhaust manifolds in stainless steel.

Howmet Industries was the first company to use this technology commercially. Because this technology was very precise, it was used quite a bit to design various parts for aircrafts. This technology is also being used by Ford Motors to develop and improve the casting process of light truck and automobile engine blocks.

Today, metal parts fabricated using gravity casting method is being used in 90 per – cent of all durable goods. Goods like stoves, washing machine, automobiles, refrigerators, lawn mowers, cars and even boats. Many other articles like badminton rackets, tennis rackets, and even football studs are made by using light weight metals which are gravity casting method. This gravity casting method has been used to develop metal alloy parts, which are used for the auto and airline industries, which is said to make vehicles lighter though much stronger and extremely efficient.

There are a lot of different metals that are used in Gravity Casting and these are casting grade iron and casting grade steel. Also die cast grade zinc can be cast using gravity casting method. Also other raw materials like sand, spin or plaster are used. Aluminum is also used, but it is very difficult to gravity cast aluminum a lot of care needs to be taken and proper pressure should be applied to obtain the desired shape and effect. 

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Learn how to Cast Jewelry and the Metal Casting Process

Metal Casting

Casting Jewelry is a process in which liquid material made from heating metals, is poured in a module, to give the liquid a desired shape. Then the liquid is cooled and a solid object in the desired shape and size is obtained. Casting Jewelry is the latest “in-thing” in the fashion markets. This jewelry is made from different materials like silver, aluminum, gold, bronze, alloy metals and even plated casting jewelry is available.

Casting Jewelry is very attractive and delicate. They are made using machines, but very finely crafted and hand made jewelry is also available in the market. This type of jewelry can be available at a very low, as well as high costs, depending on the design and material and design that you choose. Casting Jewelry is very fragile and should be handled with out most care as it can break easily. With the advent of casting jewelry, the fashion world has benefited a great deal. Today, free flowing designs, multicolored jewelry and even a special made to order jewelry is available in the market.

Before this, it was difficult to cast a metal in a desired shape but today it is as simple as it gets, all you need is a creative mind to create new designs and a group of well qualified workers and good machinery to make your own casting jewelry. This also gives you an option to make your own series of new designs. Everwhere you go in this world you can find people Casting Jewelry. With the prices of gold increasing day by day and with the entry of new metal jewelry like platinum, casting jewelry slowly but surely is making a mark in the fashion world. With the cost silver plated casting jewelry, the dream of wearing a new necklace or a new ear-ring everyday is a reality. You can actually afford new set of jewelry everyday. There are also costly models made of pure gold and delicate designs and with embedded diamonds that are available. 

Casting Jewelry is not only about fashion, it has also opened a new avenue for small scale businesses. With proper knowledge and machinery, you can start your own company and make casting jewelry. This is very nice because anyone can get started because you don't need a lot of expensive material or a lot of money to get the process started. A small store room in your house will also be sufficient to set up your casting jewelry work-shop. You can then design your own range or hire a professional jewelry designer to create your range of jewelry.

Casting Jewelry has also helped the educational branch of “jewelry designing” grow considerably. Really Jewelry Casting and Jewelry Making is right in line now with the fashion designers. Many young students are nowadays looking at jewelry designing as a full time career.

Sometimes plated casting jewerly will start to loose its coating of gold or silver if it is used on a daily basis which is really a drawback of this type of jewelry casting. If they come in contact with water regularly, then they can turn black. You can get them re-plated and use them. As casting jewelry is very fragile and delicate, even a slight mishap can change its shape or even break it.

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Learn about Casting Furnaces that you Can DIY at Home

Metal Casting

DIY Casting Furnace are nothing but Do It Yourself casting furnaces. One can make variety of furnaces. The procedure of some of them can be described as follows:

DIY Casting Furnace : Theoretically, only three things are required for implementing induction heating: High frequency Electrical Power Source, work coil for generating an alternating magnetic field, and a workpiece-electrically conducive. However, the practical approach is very complicated. For instance, the work coil and High Frequency source’ should have a matching network in between, to obtain better power transfer. Use of water cooling systems is very common in induction heaters of high power. This facilitates removal of waste heat from the matching circuit of the work coil and the coil itself. This process involves application of control electronics as well. Control Electronics, as the name suggests, controls the heating action’s intensity, thereby ensuring consistent results. Its the bad working and operating conditions that this will provide protection from.

Usually, the incorporation of work coil takes place into a resonant tank circuit. There are innumerable advantages of this. The first advantage is that any one of the parameters, i.e. voltage or current is made sinusoidal. This causes fewer losses to inverter by the way of allowing it getting benefited from either zero-current-switching or zero-voltage-switching corresponding to the arrangement chosen. The visibility of sinusoidal waveform at work coil gives the proof of purity of signal. There also occurs less interference of radio frequency with the equipment in its vicinity. The designer is the one that can choose between the various themes.

DIY Bronze Furnace: The making of DIY Casting Furnace involves taking silica bricks of 9 inches X 4 ½ inches X 2 ½ inches in the first place. After that, one is supposed to put a steel plate having dimensions 18 inches X 24 inches at the place where he intends building the furnace. In other words, the steel plate should be used as a base. The construction of furnace should start thereafter. It is advisable to keep the circumference of the furnace as 14 inches. A small hole of diameter 3 inches should be made at a height of 5.5 inches above the floor. Eleven and a half inches should be the height of the cylindrical furnace from floor to the top. This hole is to be used for inserting the burner.

The cutting of the burner port should be done in such a way that it acts as a perfect tangent to furnace. This should be done in order to make the flames whirl around crucible, thereby hitting it indirectly. The peculiarity of bronze casting is emission of toxic fumes. Good Ventilation is a very important key when casting because if what was just discussed. Safety closthing and safety glasses are really very key when you are working in this environment. After the completion of furnace (including the cutting of hole to get the fitting of one’s biggest crucible enabled), it should be permitted to dry. At that time, trawling of water, vermiculite, and kaolin clay on the exterior is recommended. The immediate use should be strictly avoided, as it may develop cracks. After drying, let the furnace be heated slowly to reduce ‘kaolin paste’ cracking.
 

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Metal Casting Process and Spin Casting and Sand Casting

Metal Casting

There are various casting processes being implemented now days. The oldest amongst them is sand casting. Metal Casting is also widely used. They can be described as follows:

Sand Casting: Sand Casting involves formation of mold from a mixture of sand and to pour a casting liquid, most probably, a molten metal into mold. The metal is then allowed to solidify and the removal of mold, takes place. Sand molding consists of two types: green sand method and air set method. The first one consists of mixture of clay, moisture, silica, and many other additives. The second one consists of mixture of dry sand and other materials, not moist clay. They are mixed with the help of a quick curing adhesive. When all of these materials are used together, it is a process called air set.

At times, there is temporary plug placed to pour the fluid which is to be molded. Air-set molds usually form molds consisting of two parts-the bottom and the top. The sand will be pounded down after the mixture of sand is added. It does not generate any by-product. After the solidification and cooling of metal, the mold gets usually destroyed. This is because its removal involves a lot of breaking and cracking. The casting accuracy depends a great deal on the sand and the process of molding used. Castings composed of green sand result into formation of rough texture on casting surface, and this characteristic makes them easily recognizable. In reality, studies show that molds that are air-set produce the smoothest castings.

Many a times, the casting process results in losing of components of sand mixture. It is possible to reuse green sand by the way of adjusting the composition to get the lost additives and moisture replenished. The entire pattern itself is eligible to be reused for producing novel sand molds. The method of reuse can be continued for an indefinite period. In 1950, casting process got automated partially. They have been in great demand for developing production lines since then. 

Spin Casting: Sand Casting is better known as Centrifugal Rubber Mold Casting (CRMC). It implies utilization of centrifugal force for producing castings out of rubber mold. As a customary practice, a mold having shape of a disc gets spun through its ‘central axis’ at a pre-decided speed. The material used for casting is usually thermoset plastic in the liquid form or a molten metal. It gets poured into the mold through the opening at its centre. Corresponding to the solidification of metal, or the setting of thermoset plastic, the spinning of the filled mold takes place.

Normally, organic rubber or vulcanized silicone is used as a mold-making substrate in spin casting. Vulcanization takes place in the middle of process of mold-making. After the successful completion of vulcanization process, venting and gating must be undergone by the mold. This implies carving of channels for ensuring proper material flow and air during the course of casting. A scalpel or knife is used to carry out the above two processes. The mold complexity is directly proportional to the time required in implementation of venting and gating.  

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Information on Metal Casting and DIY Metal Casting

Metal Casting

Casting can be defined as a process of manufacturing, which implies pouring of a ‘liquid’ material into ‘A Mold’ containing a desired shaped hollow cavity, and then made to solidify. What needs to be done to finally complete the process is to take out the casting and break it apart so you can see your finished project. The use of casting is ‘forming hot liquid metals’ or numerous metals that are cooled after having the components like clay, plaster, concrete, and epoxies mixed. Really, Casting is one of the only processes that takes complex shapes and can actually make them because other avenues just can't do it. Casting came into being around 6000 years ago. ‘Copper Frog’ is the most ancient casting existing till date since 3200 BC. The process of casting has two distinct subdivisions: non-expendable and expendable mold casting.

‘Non-expendable’ mold casting: This technique is inclusive of at least 4 distinct methods: continuous, centrifugal, die, and permanent casting.

Continuous casting: Continuous Metal Casting can be defined as a refined process of casting for high-volume, continuous production of ‘metal sections’ with constant cross-section. The pouring of molten metal into a water-cooled, open-ended copper mold takes place. This allows a ‘layer’ of ‘solid metal’ to be formed above the ‘still-liquid’ center. Continuous casting is widely accepted due to its cost-effectiveness. The metals continuously cast are aluminum, copper, and steel.

Centifugal casting: Centrifugal Metal Casting is independent of both-pressure and gravity. This is because its own ‘force feed’ is created by the way of using a ‘temporary sand mold’ in ‘spinning chamber’ at 900 N. Lead time is variant with respect to application. True- and semi-centrifugal processing allow 30 to 50 pieces/hr. The batch processing has an upper limit of around 9000 Kg (practically). This method used to be applied for ‘Casting of Railway Wheels’. A company knows as Krupp is who it was developed by. It had a German origin. The thing that is most cast by this method is Jewelry.

Die-casting: Die Metal Casting can be defined as a process of ‘forcing molten metal’ into cavities of mold under high pressure. The castings that we are talking about are really made of various types of metals such as aluminum, copper and zinc. It is even possible to make die castings of metal. The method of die casting is used where finer parts are needed.

‘Permanent Mold Casting’: This casting is made up of non-ferrous metals. It requires some time to set up (some weeks), after which the production rate of about 5 to 50 pieces/hour-mold is achieved. The coating of ‘acetylene soot’ is applied to steel cavities. This helps in removing the work piece easily and promoting longer life (of tools). Permanent molds possess a limited life span. For worn molds, replacement or refinishing is required.

Expendable mold casting: ‘Expendable Mold casting’ can be referred to as a standard classification inclusive of the following:

Sand casting: It is amongst the simplest and most popular casting types used since ages. It involves very small size operations. The bonding of sand takes place by use of clays (as in ‘green sand’) or ‘polymerized oils’, or ‘chemical binders’. Recycling is easily possible.

Plaster Casting can be easily compared to Sand Casting except that instead of sand, you use Plaster. Similarly, there are also plastic and concrete castings.

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Metal Casting Torches including Injector Torch and Cutting Torch is now described

Metal Casting

When you are utilizing oxygen and fuel gasses to cut and weld metals then this process is called Oxy-Fuel cutting.These two processes when looked at more closely are very different from one another. In the first process, a cutting torch is made use of for heating ferrous metal to a temperature of around 980 degree Celsius. An oxygen stream is being trained on a hot metal that combines with iron chemically which later flows from the kerfs, or cut in the form of slag of iron oxide. In the second process, a ‘welding torch’ is made use of for welding metals.

Torches that burn the inside fuel with air (atmosphere) cannot be termed as oxy-fuel torches. They stand out owing to the use of single tank. Welding really requires Oxygen, Fuel, and two tanks which is why this happens. It’s not possible to melt some of the metals with single-tank torches. Therefore, you can use these torches all you way for brazing and soldering but they should not be used for welding. A metal-cutting torch is better known as hot blue spanner, blue wrench, hot wrench, smoke wrench, and gas-axe.

Types of Casting Torches: The torch can be defined as the part held and manipulated by the welder to get the weld made. It possesses a valve and connection for oxygen and the same things for fuel gas, a handle to obtain the grip, an integrating chamber (angularly set) where there occurs a mixing of oxygen and fuel gas, with a tip where formation of flame takes place. The fuel gases used along with oxygen include propylene, propane, hydrogen gas, MAPP gas, Liquefied Petroleum Gas (LPG), and the most widely used is acetylene. 

Injector Casting Torch: It can be defined as an archetypal oxy-fuel torch, also known as an equal-pressure torch. It carries out the mixing of mere two gases. The injector torch operates in such a way that high pressure oxygen comes out of the tiny nozzle present in the torch head, and the fuel gas gets dragged towards it via the venturi effect.

Rose-bud Torch: The use of this torch is to carry out the heating of metals for straightening, bending, etc. It is generally used where a huge area requires heating. It produces a rose-bud shaped flame at the end, hence the name. This torch can carry out the function of heating small areas like rusted bolts and nuts as well. However, here, filler rod won’t be used with torch.

Cutting Metal Casting Torch: The head of the cutting torch is used for cutting metal. Its identification details are as follows: The inside of the torch consists of a combination of oxygen and acetylene. It helps in producing flame of a high temperature. What it looks like are three pipes that are affixed to a tube at a 90 degree angle. It also contains an oxygen-blast trigger which blasts away the material during its cutting by the way of providing oxygen.

Welding Torch: The welding torch consists of either 1 or 2 pipes running towards the nozzle without oxygen-blast trigger. As the name suggests, it performs the function of welding.

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Blast Furnace and Electric Arc Furnace now Described

Metal Casting

There are several types of Casting Furnace which include Electric Arc furnaces, Blast furnaces, Cornwall Iron Furnace, etc. Below we will take a short and concise look at some of these.

Electric Arc Furnace: This furnace can be described as a furnace heating charged materials by the way of an electric arc. These furnaces exist in all the sizes-right, from the smallest one having a capacity of around 1 ton to the largest one having a capacity of 400 tons. The former one is used in foundries to produce cast iron products, whereas the latter one is used for secondary steel making. The ones used by dentists and in research laboratories might be having capacity of a few grams only. The electric arc furnace can have temperatures risen up to 1800 Celsius. The first electric furnaces came into being in 1907, at the hands of Paul Heroult of French origin. The commercial part of these furnaces was established in the United States of America. Some of the first products that were made such as spring steel and machine tools were made using electric steel. Calcium Carbide was also prepared in these arc furnaces. It (calcium carbide) was used in carbide lamps.

This Casting Furnace comprises of a refractory-lined vessel, normally water-cooled in huge sizes, having a covering of a retractable roof, through which the entry of graphite electrodes takes place. There may be many or there may be just a few. The furnace is divided into 3 sections: the shell, consisting of lower steel bowl and sidewalls, the hearth, consisting of refractory lining the lower bowl, and the roof, that can be water-cooled or refractory-lined, and can easily be shaped into a spherical section or conical section (frustum). A refractory delta is also supported by the roof at its center, by the way of which graphite electrodes make an entry.

The process of operation starts with delivery of scrap metal to scrap bay which is located adjoining melt shop. After that, the loading of scrap into huge buckets or baskets takes place. The next step is to carry this basket to the melt shop. The charging takes place here. After the completion of charging, let the electrodes be allowed to enter and placed onto scrap. This causes the arc to be struck. Lower voltage is preferred for this part (of operation) to provide protection to the walls and roof against arc damage and excessive heat. After having the electrodes reached the heavy melt, shielding of arcs by scrap takes place. This enables a rapid formation of molten pool, thereby decreasing tap-to-tap times. Oxygen is also allowed to enter.

Casting Furnace : It can be referred to as a kind of metallurgical furnace, through which the process of smelting takes place. This produces metals, normally iron. These furnaces trace their origin to China (around 500 BC). They were also found in Belgium and England later. They do not have any special mode of operation. Heating is the only way that the metals get heated. Generally, iron is melted in these furnaces. The chemical reaction can be explained as follows:
                Fe2O3 + 3CO -> 2Fe + 3CO2

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CRT Monitors

A CRT Monitor is one of the most common types of computer monitors used today. The other most common monitor being the more recent invent, the LCD monitor. But what are the differences between the two models? How can you be sure that a CRT monitor is right for you? The main step is understanding the difference and the benefits of each type.

 

What is a CRT?

 

CRT is an abbreviation of cathode-ray tube. A CRT works by moving an electron beam back and forth across the back of the screen. Each time the beam makes a pass, it lights the phosphor dots on the inside of the glass tube. This illuminates the active portions of the screen, and by drawing many of these lines from the top to bottom of the screen, it creates the image or images you see on your computer screen.

 

Comparing CRT and LCD

 

Size-wise, the CRT monitor is much larger than the newer LCDs that are more compacted and lightweight. Due to the presence of the cathode-ray tube unit inside, adequate desk space must be allowed for CRT monitor that offers an added advantage of a larger viewing display size. LCDs, however, are becoming increasingly comparable in size to CRT monitors.

 

Many CRT monitors are able to display unlimited colors as well as multiple video resolutions. Both of these factors give CRT a leg up on LCD monitors that are limited in color capability and resolution. The CRT monitors can display multiple resolutions at the same quality while LCDs are limited to what is known as a Native resolution (the best display resolution).

 

CRT monitors generally do not have an issue with brightness due to the construction of the unit itself. The CRT also has the benefit of being able to be viewed from a very wide angle and from just about ever side.

 

While CRT monitors are generally cheaper than their LCD counterparts, the long-term costs of the CRT over the LCD are higher. CRTs consume much more energy than LCD monitors.

 

CRT Monitors in the Workplace

 

While LCDs have decreased in prices over the years, CRT monitors still have their fans in industry. The printing and broadcasting industry as well as other graphic fields (where higher resolution and viewing capabilities are needed) still use, almost exclusively, CRT monitors. Professional video and photography businesses are also still using CRTs because of the better color and contrast abilities.

 

Finding CRT Monitors

 

Deciding what type of monitor you purchase depends on your individual needs. Many major manufacturers of CRT monitors have discontinued or plan to discontinue production of these monitors. So, if you wish to purchase a CRT model, you may find yourself having to search harder than originally hoped.  However, be diligent, even with the newer models of LCD monitors becoming available with new capabilities, CRT monitors still have them beat in many important areas.

Spyware: The Lurking Danger On Your Computer

It is not always possible to know whether or not your laptop or computer has become affected by spyware since such malicious programs are something that remain in the background and go about their business in the shadows without letting you become aware that a problem exists with your personal computer or laptop.

Be Aware

Most of us are not even aware about what damage such software can do to your system and you may also not be aware of preventive measures to help block the presence of spyware, which makes matters worse. It is therefore necessary to look a little deeper into the problem and know what spyware actually is and how you can prevent it from disrupting the proper working of your system.

Spyware are essentially computer programs that plant themselves on your computer's hard disk and are known to come in different flavors and types, and they can also even jot down your browsing activities. These programs are able to also send such information to third parties while others will note down your keystrokes and then send sensitive information to people that should not have access to such sensitive information.

Certain types of spyware that are known as keyloggers can steal your password as well as username and provide this information to those who will take unfair advantage of that information. The internet is the most common way of getting spyware on your system--often when downloading software or other programs.

However, not all spyware is actually dangerous--it is nevertheless an unwanted risk that can do damage to your system. Therefore, it has become necessary that you learn how to protect your computer from such programs and your best bet would be to use certain specialized programs that are designed to identify and then rid your system of such unwanted intruders.

Spybot is one such computer program, which can help you keep your system free and your personal information well protected. You need to be aware of certain kinds of spyware that will try and fool you into thinking that they are actually anti-spyware programs when in fact they are not.

To fight the threat posed by spyware it would pay to look at the possibility of using spyware blockers. Of course, some spyware won't do anything malicious though others will try and do harm. It pays to ensure that you don't take risks and use whatever means are available to prevent your system from becoming corrupted by spyware.

It is not always possible to know whether or not your laptop or computer has become affected by spyware. Read this awesome free article explaining the perils of spyware on your computer. View more articles at http://www.spyware.jsgenterprises.com.

Learn about Furnace Torches

Furnace Torch

Metal Casting provides the hobbyist with a great way to create personalized parts and pieces that may otherwise be unattainable or far too expensive. Casting is an ancient art that is still is use to this day by major industries to artists to those with backyard foundries. This skill is a valuable one that promises to provide the hobbyist with a rewarding past time. Most hobbyists begin their casting careers with a modest sized furnace to fit their most basic needs. Within a few months, the hobbyist might find that the furnace has grown and that they are casting at every chance that comes along. Don't worry, this is completely natural.

To say that Metal Casting is addictive is an understatement. Metal casting provides a way for an idea to materialize through molten metal. This is perhaps one of the greatest parts of the entire metal casting process like seeing what was once just sketches solidify from liquid iron, or whatever metal is used. What is nice about metal casting, is that you create an idea for a design and then all you need is molten metal to make that design.

The furnace is the pride and joy for the metal caster. Most will construct their own furnace tweaking the design here and there to better suit their needs. Many home Home Metal Casting foundries are based on home made furnaces and if constructed correctly can prove to be highly effective.  The crucial part of the furnace is the furnace torch. The torch brings the heat, incredibly high heat, and without it that chunk of metal would just sit in the crucible and never see life as something new and exciting. Except as a paper weight; a very ugly paper weight.

When searching for an appropriate casting torch the hobbyist will need to take several things into consideration. The size of the furnace, and what metals you plan to use are chief among the considerations. Many casters will use a torch that uses propane gas as it provides enough pressure and heat to melt most metals. An easy solution seems that you could tap into the natural gas line that is already going to your house but usually this line will not provide enough heat or pressure. The same is true for Butane. While natural gas and Butane can be used, propane seems to yield the best results. Oxyacetylene torches are a favorite with many casters especially for casting iron.

Price is yet another consideration. While it may be possible to rig a casting furnace it is not always advisable. Torches can range in price from $40 to several hundreds of dollars depending upon the size, the use, and accessories.

Many jewelers are able to use small independent casting torches but when dealing with metal casting in furnaces you will need to use a torch that can be mounted and used in such a fashion. Many think that just because you need a furnace torch you are going to need a large furnace. This is simply not true. A small furnace and furnace torch can produce enough heat to melt aluminum, iron, and a number of other metals. One of the furnaces functions is to help the flame reach optimum temperature and in the case of Reverberatory Furnaces, a furnace torch is an absolute requirement.

Casting torches can be found in some hobby shops and in hardware stores. Several online shops also sell torches for the hobby metal caster. When buying a torch hobbyist should shop around in order to find the best deal. Always use caution when dealing with a furnace torch.

 
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Silversmithing Tools along with Metal Casting Tools

Metal Casting

Metal Casting takes a certain amount of skill and knowledge not to mention the appropriate tools of the trade. Luckily, anyone can learn metal casting and the tools are widely available and some can even be crafted right at the home workshop.

Most of the DIY Casting tools are pretty standard and can be used for the different casting processes. If you already familiar with metal work then the chances are pretty good that you already have some of the tools in your garage or workshop. In fact, it is possible to make many of the tools that are commonly found in small foundries.  If you are unable to make your own tools then there are many online resources where you can buy tools and even home improvement stores will have the tools.

The absolute must have metal casting tools will be used for safety. Safety in the home foundry is a must since any accidents that can occur will more then likely result in devastating injuries, remember safety first.

Gloves will be necessary when pouring the molten metal or picking up the crucible with the aid of heavy strength tongs. The heat from many of the molten metals will be very intense so long sleeve shirts are also advisable. Jeans and work boots will help prevent any injuries in case of spills. Remember, molten metal will splatter when poured on wet surfaces or surfaces that have recently been wet. Even concrete can cause molten metal to splatter that is why metal casters always keep a muffin tin on hand where any excess molten metal can be safely stored. Always wear goggles when working with intense flames to avoid eye damage. Without the appropriate safety gear injuries are pretty much guaranteed. 

The furnace is the most important tool of the trade when it comes to metal casting. This tool does not necessarily have to be large and can even be as small as a flower pot. Size does not matter and even the smallest of furnaces can melt your alloy. The individual tools used in the furnace can differ. Not all of them will use a crucible but all of them will use a fuel source and require a refractory of some sort to help shield the furnace and direct the heat.

The crucible is where you place the metal to be melted. It pools inside the crucible and with help of tongs which can be made in a workshop is transported to the mold to be poured. For furnaces that do not use crucibles like cupolas, a ladle is needed to transport the mold. The desired shape of the molten metal bascially is caused by the mold that the metal is poured into. The mold consists of two pieces a cope and drag. The cope is the top half of the mold and the drag the bottom. The sprue is where the molten metal enters the mold. After the metal solidifies the sprue is cut away from the cast.

Metal Casting involves many other tools some of which are used for all processes and some are not. The tools needed change from job to job. When you start out in metal casting make sure you gather all the needed tools before you begin. As you start new jobs or look at doing new projects then you can start o gather more tools in your inventory.

 
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