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Production of pistons having a cavity

  • US 4,712,600 A
  • Filed: 07/09/1986
  • Issued: 12/15/1987
  • Est. Priority Date: 07/12/1985
  • Status: Expired due to Fees
First Claim
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1. A method for producing a piston of a light alloy matrix metal having a cavity within its head by pressure casting, comprising the steps of:

  • preforming a precursory member having the shape of said cavity from an extractable material which remains in solid state at room temperature and is convertible into a fluid at a heating temperature below the melting point of the matrix metal,disposing said precursory member in place in a pressure casting mold having a cavity corresponding to the shape of the piston, while covering said precursory member with a porous member stable to molten matrix metal,pouring molten matrix metal into the mold cavity and applying a pressure thereto to form a piston-shaped casting having said precursory member and said porous member embedded therein, andheating said casting at a temperature below the melting point of said matrix metal and above the fluidizing temperature of the material of said precursory member to convert the precursory member material into a fluid, and extracting said fluid from said casting, leaving a cavity at the location of said precursory member.

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