Method for manufacturing golf club head
First Claim
1. A method for manufacturing a hollow golf club head comprising the steps of:
- preparing a main frame made of a metal material and provided with a top opening and a bottom opening;
preparing a sole plate made of a metal material, whereinthe specific gravity SGs of the metal material of the sole plate is larger than the specific gravity SGm of the metal material of the main frame, andthe proof stress YSs of the metal material of the sole plate is smaller than the proof stress YSm of the metal material of the main frame, andthe sole plate comprises a main part which can almost fit to the bottom opening, and a protrusion which protrudes from the peripheral edge of an inner surface of the main part;
placing the sole plate in the bottom opening of the main frame so that the protrusion protrudes from the inner surface of an edge portion of the main frame around the bottom opening;
inserting a die into the inside of the main frame through the top opening;
caulking the sole plate by crushing the protrusion of the sole plate onto said edge portion around the bottom opening, by the use of the inserted die;
placing the crown plate in the top opening of the main frame; and
fixing the crown plate to the main frame.
3 Assignments
0 Petitions
Accused Products
Abstract
A method for manufacturing a hollow golf club head is disclosed, wherein a metallic main frame provided with a top opening and a bottom opening, a metallic crown plate and a metallic sole plate are prepared. The sole plate is placed in the bottom opening. A die is inserted into the inside of the main frame through the top opening. A protrusion of the sole plate is crushed onto the edge portion of the main frame around the bottom opening, by the use of the inserted die. Then the top opening is closed by the crown plate. The specific gravity SGm and proof stress YSm of the main frame, the specific gravity SGs and proof stress YSs of the sole plate, and the specific gravity SGf of the face plate satisfy: SGf=<SGm<SGs and YSs<YSm.
18 Citations
11 Claims
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1. A method for manufacturing a hollow golf club head comprising the steps of:
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preparing a main frame made of a metal material and provided with a top opening and a bottom opening; preparing a sole plate made of a metal material, wherein the specific gravity SGs of the metal material of the sole plate is larger than the specific gravity SGm of the metal material of the main frame, and the proof stress YSs of the metal material of the sole plate is smaller than the proof stress YSm of the metal material of the main frame, and the sole plate comprises a main part which can almost fit to the bottom opening, and a protrusion which protrudes from the peripheral edge of an inner surface of the main part; placing the sole plate in the bottom opening of the main frame so that the protrusion protrudes from the inner surface of an edge portion of the main frame around the bottom opening; inserting a die into the inside of the main frame through the top opening; caulking the sole plate by crushing the protrusion of the sole plate onto said edge portion around the bottom opening, by the use of the inserted die; placing the crown plate in the top opening of the main frame; and fixing the crown plate to the main frame. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A hollow golf club head comprising
a main frame provided with a front opening and a bottom opening and made of a material having a specific gravity SGm and a proof stress YSm, a face plate covering the front opening and made of a material having a specific gravity SGf, and a sole plate covering the sole portion and made of a material having a specific gravity SGs and a proof stress YSs, wherein the specific gravities SGm, SGf and SGs satisfy the following condition: - SGf=<
SGm<
SGsand the proof stress YSm and proof stress YSs satisfy the following condition;
YSs<
YSm.- View Dependent Claims (8, 9, 10, 11)
- SGf=<
Specification