Procedure, advantages and disadvantages of investment casting

Investment casting 

• Investment casting also known as lost wax process or precision casting.
• This is suitable for stainless steel and brass.
• In this method wax pattern is made first.
• Wax patterns are made by injection.
• The wax is injected into mould at a pressure of 35 to 7MPa and 50⁰ to 80⁰.
• Then precoating the wax pattern assembly.
• The coated wax assembly is inverted in the mould.
• The molten metal is poured into the mould. The casting are removed from the mould after solidification.

Advantages

• Good Surface finish
• No Casting defects

Dis advantages

• Slow process
• Suitable for small parts
• High production cost