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Metal casting

  • US 3,863,706 A
  • Filed: 12/04/1972
  • Issued: 02/04/1975
  • Est. Priority Date: 12/04/1972
  • Status: Expired due to Term
First Claim
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1. In casting apparatus having a sealable melting and mold pouring chamber, a sealable loading compartment mounted on said chamber and valve and conduit means communicating between said chamber and said compartment that improvement comprising:

  • a sealable mold container having a bottom opening for sealing around the lower open end of a gas permeable mold supported therewithin and extending downwardly therebeyond said mold container including upper and lower cup elements movable into sealed relationship with one another a crucible in said chamber having surrounding induction coils for holding and stirring molten metal to cause outward surface movement thereof along its surface to carry impurities away from the central area of said crucible power means including piston means independently supporting said cup elements from above for relative movement into said sealed relationship and for movement between said compartment and said chamber through said valve and conduit means to said central area of said crucible and means for selectively varying the pressure of said chamber, compartment and container to fill said mold after lowering said container with the lower open of said mold beneath the surface of molten metal in said central area of said crucible and permit loading and unloading said mold from said container in raised position by relative movement of said cup elements within said compartment while maintaining the chamber pressure by closure of said valve and conduit means.

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