US2002025861A1PendingUtilityA1

Golf club head and method of manufacturing the same

36
Priority: Aug 28, 2000Filed: May 22, 2001Published: Feb 28, 2002
Est. expiryAug 28, 2020(expired)· nominal 20-yr term from priority
Inventors:Hiroyuki Ezawa
A63B 53/0466A63B 53/047A63B 53/0416A63B 53/0408A63B 53/0458A63B 53/0425A63B 53/0454A63B 53/045
36
PatentIndex Score
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Cited by
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References
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Claims

Abstract

A face portion 11 of a golf club head 10 is obtained press-forming a metal plate into a predetermined shape. On the front surface 11 a of the face portion 11 , score lines 12 are formed by means of die sinking of electrical discharge machining, and a mirror finished surface portion 13 is formed by means of finish processing of electrical discharge machining. On the rear surface 11 b of the face portion 11 , a rib structure 15 , and a high hardness layer 16 of an amorphous metal layer are formed. The electrical discharge machining is numerically controlled.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A golf club head comprising a high hardness layer on front and/or rear surfaces of a face portion, the high hardness layer being constituted by a transmuted layer formed by means of electrical discharge machining.  
     
     
         2 . The golf club head according to  claim 1 , wherein the high hardness layer has a micro-Vickers hardness of 1000 or more.  
     
     
         3 . A golf club head comprising a corrosion resistant layer formed on front and/or rear surfaces of a face portion, the corrosion resistant layer being constituted by a transmuted layer formed by means of electrical discharge machining.  
     
     
         4 . A golf club head comprising a wear resistant layer formed on front and/or rear surfaces of a face portion, the wear resistant layer being constituted by a transmuted layer formed by means of electrical discharge machining.  
     
     
         5 . The golf club head according to any one of  claims 1  to  4 , wherein the high hardness layer, the corrosion resistant layer or the wear resistant layer is an amorphous layer which is formed using a silicon electrode and contains silicon.  
     
     
         6 . The golf club head according to any one of  claims 1  to  4 , wherein the high hardness layer, the corrosion resistant layer or the wear resistant layer is constituted by the transmuted layer and an amorphous layer which is formed on the transmuted layer by means of finish processing using a silicon electrode and contains silicon.  
     
     
         7 . A golf club head comprising a mirror finished surface portion formed on a front surface of a face portion, the mirror finished surface portion being formed by means of finish processing of electrical discharge machining.  
     
     
         8 . The golf club head according to  claim 7 , wherein the mirror finished face portion has a maximum roughness of 1 μm or less.  
     
     
         9 . A golf club head comprising a roughly finished surface portion formed on a front surface of a face portion, the roughly finished surface portion being formed by means of rough processing of electrical discharge machining.  
     
     
         10 . A golf club head comprising a reinforced layer having a rib structure formed on a rear surface of a face portion, the reinforced layer being formed by means of die sinking of electrical discharge machining.  
     
     
         11 . A golf club head of an iron having a cavity back structure, comprising a decoration layer which is formed on a rear surface of a face portion formed by means of die sinking of electrical discharge machining.  
     
     
         12 . The golf club head according to  claim 11 , wherein the decoration layer includes electrical discharge traces formed by means of electrical discharge machining.  
     
     
         13 . A method of manufacturing a golf club head in which a high hardness layer is formed on front surface and/or rear surfaces of a face portion, the high hardness layer being constituted by a transmuted layer formed by means of electrical discharge machining.  
     
     
         14 . A method of manufacturing a golf club head in which a corrosion resistant layer is formed on front surface and/or rear surfaces of a face portion, the corrosion resistant layer being constituted by a transmuted layer formed by means of electrical discharge machining.  
     
     
         15 . A method of manufacturing a golf club head in which a wear resistant layer is formed on front surface and/or rear surfaces of a face portion, the wear resistant layer being constituted by a transmuted layer formed by means of electrical discharge machining.  
     
     
         16 . The method of manufacturing a golf club head according to any one of  claims 13  to  15 , wherein, the high hardness layer, the corrosion resistant layer or the wear resistant layer is an amorphous layer which is formed using a silicon electrode and contains silicon.  
     
     
         17 . The method of manufacturing a golf club head according to any one of  claims 13  to  15 , wherein, the high hardness layer, the corrosion resistant layer or the wear resistant layer is constituted by the transmuted layer and an amorphous layer which is formed on the transmuted layer by means of finish processing using a silicon electrode and contains silicon.  
     
     
         18 . A method of manufacturing a golf club head in which a mirror finished surface portion is formed on a front surface of a face portion, the mirror finished surface portion being formed by means of finish processing of electrical discharge machining.  
     
     
         19 . A method of manufacturing a golf club head in which a roughly finished surface portion is formed on a front surface of a face portion, the roughly finished surface portion being formed by means of rough processing of electrical discharge machining.  
     
     
         20 . A method of manufacturing a golf club head of an iron, wherein a reinforced layer having a rib structure is formed on a rear surface of a face portion, the reinforced layer being formed by means of die sinking of electrical discharge machining.  
     
     
         21 . A method of manufacturing a golf club head of an iron having a cavity back structure, wherein a decoration layer is formed on a rear surface of the face portion by means of die sinking of electrical discharge machining.

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