Chapter 4 CASTING.ppt
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Casting is a manufacturing process where a liquid material is poured into a mold, which contains a hollow cavity of the desired shape. The liquid material is then allowed to solidify in the mold, taking on its shape. The document discusses two main types of casting: sand casting and die casting. Sand casting involves creating a sand mold around a pattern, pouring molten metal into the mold cavity, and letting it solidify. Die casting uses high pressure to force molten metal into a mold cavity. The mold is then opened to eject the finished casting.
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Chapter 4 CASTING.ppt
- 1. CASTING Manufacture of a machine part by heating a metal or alloy above its melting point and pouring the liquid metal/alloy in a cavity approximately of same shape and size as the machine part is called casting process. The two major classification of casting is as follows 1. Sand Casting 2. Die Casting mohankumar
- 2. Sand casting • Pattern Making: The different materials used to make the pattern are Wood, Metal such as Cast iron, Brass, Aluminium, Plastics, Rubbers, Plasters, Waxes • Mould making: Sand is used to make the mould • Melting the Metal: Metal is melted in the melting furnace • Casting: Molten metal is poured in the mould • Fettling: Sand and casting are separated • Testing & Inspection: Casting is done inspection Pouring the molten metal into the mold cavity and allowed to solidify is called Casting. mohankumar
- 3. Sand Casting Place a pattern in sand to create a mold. Incorporate the pattern and sand in a gating system. Remove the pattern. Fill the mold cavity with molten metal. Allow the metal to cool. Break away the sand mold and remove the casting. mohankumar
- 4. Mould making mohankumar Sand casting process can be used to make Electric motor bodies, Pump bodies, Machine bodies, Big size gears and Pipes. Source:http://www.themetalcasting.com/casting-mold-making.html
- 5. Sand casting process can be used to make Electric motor bodies, Pump bodies, Machine bodies, Big size gears and Pipes. mohankumar Source:http://www.finetechnocast.in/casting-product.html
- 6. Die Casting 1. Close and lock the two halves of a die after coating the mould cavity surfaces with a mould wash, if specified 2. Inject the molten metal under pressure into the die. 3. Maintain the pressure until metal solidifies. 4. Open die halves. 5. Eject the casting along with runner, riser etc. 6. The above cycle is repeated. Two pressure die casting methods are used: 1. Hot chamber process 2. Cold chamber process mohankumar
- 7. DIE CASTING METHODS This uses pressures up to 35 MPa and is used for zinc, tin, lead, and their alloys. In this process the chamber, in which molten metal is stored before being pressure injected into the die, is kept heated. mohankumar Hot chamber process Source:http://4mechtech.blogspot.com/2014/09/die-casting-process.html
- 8. Cold chamber process Cold chamber process: In this process, pressures as high as 150 MPa are used. The storing chamber is not heated. This process is used mainly for metals and alloys having relatively higher melting point e.g., aluminium, magnesium and their alloys. mohankumar Source:https://getrevising.co.uk/revision-cards/processing_metals
- 9. REFERENCES Manufacturing Technology: Foundry, Forming and Welding, 4e (Volume 1) by PN Rao mohankumar