Manufacturing method for a golf club head

Abstract

A manufacturing method for a golf club head is disclosed. The golf club head is composed of a body and a reinforced plate secured to the body at a sweet spot of the golf club head. The reinforced plate is embedded in the body by friction welding. Whereby, the reinforced plate is securely integrated with the body and the head has a long term of use life.

What is claimed is:  
     
         1 . A manufacturing method for a golf club head comprising steps: 
 making a body ( 20 ) and a reinforced plate ( 10 ) by casting or forging, wherein a major component of the reinforced plate ( 10 ) is the same metal as that of the body ( 20 ), but the reinforced plate ( 10 ) is harder than the body ( 20 );    friction welding the reinforced plate ( 10 ) on the body ( 20 ) at a sweet spot ( 21 ), wherein the body is fixed steady and the reinforced plate ( 10 ) is turned with a high rotation speed and has a vertical pressure (P) exerted thereon, and when the reinforced plate ( 10 ) touches the body ( 20 ), friction occurring from the rotation of the reinforced plate against the fixed steady body and the vertical pressure (P) melts interface areas of the reinforced plate ( 10 ) and the body ( 20 ), and the reinforced plate ( 10 ) is securely embedded in the body ( 20 ) and has burrs ( 200 ) formed therearound; and    finishing the head by removing the burrs ( 200 ) and the part of the reinforced plate ( 10 ) protruded from the body ( 20 ).    
     
     
         2 . The manufacturing method as claimed in  claim 1 , wherein the rotational speed of the reinforced plate ( 10 ) is 3000 RPM to 20000 RPM.  
     
     
         3 . A golf club head comprising: 
 a body ( 20 ); and    a reinforced plate ( 10 ) integrated with the body ( 20 ) at a sweet spot ( 21 ) by means of friction welding.