Method for manufacturing iron golf club head

• US 5,930,887 A
• Filed: 02/04/1998
• Issued: 08/03/1999
• Est. Priority Date: 02/07/1997
• Status: Expired due to Fees

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Tomita, Osamu, Tsuchida, Atsushi
• Primary Examiner(s): ECHOLS, PERCY W
• Application Number:
  US09/018,829
• Time in Patent Office: 545 Days
• Field of Search: 29/527.1, 409/131, 409/132, 473/291, 473/324, 473/349, 473/350, 473/409
• US Class Current: 29/527.1
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/047 iron-type
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like
• CPC Class Codes: B23P 13/02 in which only the machining operations are important
• CPC Class Codes: Y10T 29/4998 Combined manufacture including applying or shaping of fluent material

Abstract

A cavity iron golf club head being forme from a metal ingot by a rotary cutting tool that has a conical cutting section and a cylindrical cutting section which are formed into an integral unit in tow stages with the respective cutting surface angles differing from each other. An inner circumferential surface on the head sole side of an indentation formed in the back surface of the metal ingot which has been roughly finished and formed in cut into an overhanging surface shape by the conical cutting section and cylindrical cutting section of the rotary cutting tool, and the other inner circumferential surfaces on the toe and heel sides and on the top side of the metal ingot are cut into upright surface shapes by the cylindrical cutting section of the rotary cutting tool.

Claims

1. A method for manufacturing by a cutting tool an iron golf club head having a cavity that is formed as an indentation on a back surface side of said head, and an inner circumferential surface on a head sole side of said cavity is formed with a shape of an overhanging surface and other inner circumferential surfaces which are continuous to said overhanging surface and comprise toe, heel and top sides of said cavity are formed with a shape of upright surfaces, wherein,

said rotary cutting tool has a configuration in which a conical cutting section and a cylindrical cutting section are integrated into two stages;

said inner circumferential surface on said sole side of said indentation on the back surface side of a roughly finished and formed head ingot is cut into overhanging surface shape by means of said conical cutting section and said cylindrical cutting section;

said other inner circumferential surfaces of said indentation on said to toe, heel top sides, which are continuous to said overhanging inner circumferential surface, are cut into upright surface shapes by means of said cylindrical cutting section; and

a surface of said head ingot which has been subjected to said cutting is subjected to surface treatments including polishing and plating.

2. A method for forming a golf club head from an iron ingot having a cavity by a method comprising the steps of:

cutting a first inner circumferential surface of an indentation in said iron ingot so as to form a first inner circumferential surface into an overhanging surface shape by a conical cutting section of a rotar, cutting tool and a cylindrical cutting section of said cutting tool, said first inner circumferential surface being located on a sole side of said club head;

cutting second inner circumferential surfaces and a third inner circumferential surface of said indentation so as to form said second and third inner circumferential surfaces into upright surface shapes by said cylindrical cutting section of said cutting tool, said second inner circumferential surfaces being located on toe and heel sides of said club head and said third inner circumferential surface being located on a top side of said club head; and

an entire surface of said club head upon which cutting by said cutting tool has been performed is surface treated.