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Ceramic mold casting - for the production of precision castings
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By : Mark Nel
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What is Ceramic Mold Casting Ceramic mold casting is a process in which materials are combined to make a mold which has rubber like consistency. As in plaster mold casting, the pattern used in ceramic mold casting is made of rubber, metal, plastic, wood or plaster. Ceramic mold casting can be used for simple home foundry casting and also complicated, intricately designed industrial castings. The process is a expensive, but it can eliminate costly secondary machining operations and can produce castings with high accuracy and smooth surfaces. Stainless steel impellers, cutting tools, impellers made from bronze, plastic mold tooling are some of the parts made using this process. The Process
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Ceramic mold casting, is an expendable process in which reusable and cheap patterns made of wood, metals, plastic or rubber are used. Patterns with intricate designs can be used since the molding material supports castings of complicate designs.
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In ceramic mold casting, there are two different types of slurries used which are known as the true ceramic molding and shaw process. The patterns are kept is a flask and aggregate is poured over the pattern. Molding material sets in a rubber like consistency around the pattern. The rubber like consistency makes it easy for the
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pattern to be stripped out of the mold. The mold which is made in cope and drag form, is heated to make it harden (It is baked in a furnace at about 1000 degree celsius (1832 degree Farenheit). The strong mold is useful for high temperature pours, which can be done when the mold is still hot. With a creative bend of mind, ceramic molds can designed in any imaginative shapes. The slurry used for ceramic mold casting can be made of a mixture of zinc, calcined, high-alumina mullite slurries or as in shaw process, the molding mixture consist of mixture to refractory filler, hydrolyzed ethyl silicate and a liquid catalyst. Generally the mold is heated in an oven by combining the shaw process and the lost wax process, the advantage of both the process can be gained.
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Features of Ceramic Mold Casting:
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Tolerances can be held to 0.4 % Surface finishes can be better than 2 - 4 µm (.075 - .15 µin) Wall thickness can be as small as 1.25 mm (.050 in) Weights: Can range from 60 g (2oz) to a 1000kg Draft allowance: 1 Degree
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Ceramic Mold Casting Applications Using stainless steel and bronze, ceramic mold casting is best suited for casting a wide variety of products ranging from house hold goods to industrial tools. Some of casted products are kitchenwares like kettles, industrial products like impellers, complex cutting tools, plastic mold tooling etc. Advantages: * High temperature pours possible therefore suitable for steels and other alloys * Creative complex designs can be made * Can be used for mass production * Casting with accurate dimensional accuracy possible * Little machining is required therfore difficult-to machine alloys can be cast * Supports both industry and home foundry operations * Complicate and innovative designs can be casted. For more information on ceramic mold castings, Metal casting , investment castings, sand and metal castings, visit: http://www.industrialmetalcastings.com
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Author Resource:- Mark Nel has lot of experience and great knowledge about casting industry, metal casting, sand casting,die casting,investment casting,metal casting process,industrial casting supplies,industrial casting process. He just want to share his exrperience and knowledge through article. Now he is associated with industrialmetalcastings.com Article From article monkeys article directory Submitted 2010-05-06 03:47:48
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