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Investment casting of golf club heads with high density inserts

  • US 5,766,091 A
  • Filed: 06/27/1997
  • Issued: 06/16/1998
  • Est. Priority Date: 06/27/1997
  • Status: Expired due to Fees
First Claim
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1. A method of making a composite golf club head containing at least one insert comprising the steps:

  • (a) forming a disposable pattern of a golf club head that includes at least one insert at least a portion of which protrudes from the exterior of said pattern so as to form at least one protruding insert;

    (b) forming a multi-layered mold around said pattern and said protruding insert, said mold comprising (i) at least one face coat layer of metallic or ceramic particles and a metallic oxide binder, and (ii) a multiplicity of backup layers of progressively coarser particles and a metallic oxide binder, wherein said metallic particles in said at least one face coat layer are selected from the group consisting of Nb, Ta, Mo and W;

    (c) removing said pattern from said mold;

    (d) curing said mold to form a refractory mold;

    (e) filling said refractory mold at ambient temperature with a molten reactive metal to form a golf club head in the shape of said pattern and containing said at least one protruding insert;

    (f) removing said mold from said golf club head; and

    (g) removing the protruding portion of said at least one protruding insert.

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