Positioning tool for ceramic cores

• US 6,830,093 B2
• Filed: 12/06/2002
• Issued: 12/14/2004
• Est. Priority Date: 12/26/2001
• Status: Active Grant

• Current Assignee: Callaway Golf Company
• Original Assignee: Callaway Golf Company
• Inventors: Bramley, John
• Primary Examiner(s): Stoner, Kiley S.
• Assistant Examiner(s): TRAN, LEN
• Application Number:
  US10/065,987
• Publication Number:
  US 20030116300A1
• Time in Patent Office: 739 Days
• Field of Search: 164/34, 164/35, 164/516
• US Class Current: 164/34
• CPC Class Codes: B22C 7/02 Lost patterns
• CPC Class Codes: B22C 9/04 Use of lost patterns
• CPC Class Codes: B22C 9/10 Cores; Manufacture or installation of cores breaker cores B22C9/084

Abstract

An apparatus and method for forming a hollow golf club head is disclosed. The apparatus includes a first mold cavity having depressions formed therein, a second mold cavity having a shape complementary to the exterior of the desired club head, a ceramic core, and wax injecting means. Each depression of the first mold cavity has a depth equal to a desired wall thickness of a corresponding portion of the club head. When the ceramic core is placed in the first mold cavity and wax is injected, wax protuberances, which correspond to the depressions, are formed about the ceramic core. The wax protuberances position the ceramic core in the second mold cavity, where wax is deposited over the majority of the ceramic core.

Claims

1. A method for forming a hollow, metallic golf club head, the method comprising:

placing a ceramic core into a first mold cavity, the first mold cavity having a plurality of depressions formed therein;

injecting wax into the first mold cavity to fill in the plurality of depressions, the wax adhering to portions of an exterior surface of the ceramic core and forming a plurality of wax protuberances on the exterior surface, each protuberance corresponding to a respective depression in the first mold cavity;

placing the ceramic core with the wax protuberances into a second mold cavity, the second mold cavity having a shape complementary to a desired exterior of the golf club head, the plurality of wax protuberances properly positioning the ceramic core in the second mold cavity;

injecting wax into the second mold cavity, the wax adhering to a majority of the exterior surface of the ceramic core and to the wax protuberances;

forming a shell over the wax;

melting the wax to form a gap between the shell and the ceramic core; and

casting molten metal into the gap to form the golf club head.

2. The method according to claim 1, further comprising providing the first mold cavity with the plurality of depressions, each depression having a depth substantially equal to a desired wall thickness of a corresponding portion of the golf club head.

3. The method according to claim 2, further comprising providing the first mold cavity with a plurality of channels formed therein, the channels interconnecting the depressions.

4. The method according to claim 1, wherein placing the ceramic core into the first and second mold cavities includes fully enclosing the ceramic core within each of the first and second mold cavities.

5. The method according to claim 1, further comprising removing the ceramic core from the metal golf club head.