Method for manufacturing iron golf club head, iron golf club head, and iron golf club

Patent metadata

Field	Value
Publication number	US-11007411-B2
Application number	US-202016863053-A
Country	US
Kind code	B2
Filing date	Apr 30, 2020
Priority date	Mar 31, 2017
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

Provided is a method for manufacturing an iron golf club head by forging a single round rod member with a pair of dies to form, as a single piece, a body and a neck into which a shaft is to be inserted. The method includes: a first step of heating the single round rod member into a heated material; a second step of placing the heated material in the pair of dies; and a third step of forging the heated material placed in the pair of dies. In the third step, the heated material is prevented from flowing out from parting surfaces of the respective dies at a sole side of the body in the pair of dies, and the heated material blocked at the sole side in the pair of dies flows toward each of a toe of the body and the neck in the pair of dies.

First claim

The invention claimed is:

1. An iron golf club head comprising a body forming a ball striking portion, and a neck into which a shaft is to be inserted, the body and the neck being formed as a single piece from a single material by forging, wherein
grain flows extend from the neck to a toe of the body, and
a ratio of the number of grain flows included in the iron golf club head to the number of grain flows included in the single material is higher than 97%.

2. The iron golf club head according to claim 1 , wherein
grain flows are formed in a curved shape along a shape of an outer edge of the body from a sole to the toe of the body.

3. The iron golf club head according to claim 2 , wherein
a sole side of the body includes at least a grain flow satisfying a relation:
1.30 Ls≤Lt≤1.35 Ls

where Ls is a length of a score line in a toe-heel direction formed in a face of the body, and Lt is a length of the grain flow extending in the body from a heel side end of the score line to a toe-side end of the body.

Assignees

• Mizuno Kk
• Chuo Ind Ltd

Inventors

• Doi Kazuhiro
• Kanayama Tetsuya
• Yoshikawa Jun

Classifications

• A63B2209/00

  Characteristics of used materials · CPC title

• B21J5/008

  Incremental forging · CPC title

• A63B53/0433

  with special sole configurations · CPC title

• A63B2102/32

  Golf · CPC title

• B21K17/00

  Making sport articles, e.g. skates · CPC title