Method for Manufacturing a Golf Club Head

Abstract

A method for manufacturing a golf club head with an improved surface hardness and surface strength is disclosed. The method includes forging a spring steel to form a club head body with a striking faceplate portion and a back portion opposite to the striking faceplate portion, and quenching the club head body by a quenching medium at 800-1000° C.

What is claimed is: 
     
         1 . A method for manufacturing a golf club head, comprising:
 forging a spring steel to form a club head body having a striking faceplate portion and a back portion opposite to the striking faceplate portion, and   quenching the club head body by a quenching medium at a quenching temperature of 800-1000° C.   
     
     
         2 . The method for manufacturing the golf club head as claimed in  claim 1 , wherein quenching the club head body comprises quenching an entire area of the club head body. 
     
     
         3 . The method for manufacturing the golf club head as claimed in  claim 2 , wherein quenching the club head body comprises soaking the entire area of the club head body in the quenching medium for 5-30 seconds. 
     
     
         4 . The method for manufacturing the golf club head as claimed in  claim 1 , wherein quenching the club head body comprises quenching the striking faceplate portion of the club head body. 
     
     
         5 . The method for manufacturing the golf club head as claimed in  claim 4 , wherein quenching the club head body comprises quenching the back portion of the club head body. 
     
     
         6 . The method for manufacturing the golf club head as claimed in  claim 4 , wherein quenching the club head body comprises ejecting the quenching medium to the club head body with a nozzle head at a rate of 5-20 L/min. 
     
     
         7 . The method for manufacturing the golf club head as claimed in  claim 1 , wherein the quenching medium is a fluid having a temperature of 5-40° C. 
     
     
         8 . The method for manufacturing the golf club head as claimed in  claim 1 , further comprising forming grooves on the striking faceplate portion of the club head body prior to quenching of the club head body. 
     
     
         9 . The method for manufacturing the golf club head as claimed in  claim 8 , wherein forming the grooves comprises pressing the striking faceplate portion of the club head body to form the grooves. 
     
     
         10 . The method for manufacturing the golf club head as claimed in  claim 1 , further comprising forming grooves on the striking faceplate portion of the club head body after quenching of the club head body. 
     
     
         11 . The method for manufacturing the golf club head as claimed in  claim 10 , wherein forming the grooves comprises milling the striking faceplate portion of the club head body to form the grooves. 
     
     
         12 . The method for manufacturing the golf club head as claimed in  claim 1  further comprising: preparing the spring steel made of 0.8-1.1 wt % of chromium, 0.65-0.95 wt % of manganese, 0.47-0.55 wt % of carbon, 0.15-0.35 wt % of silicon, 0.15-0.25 wt % of vanadium, less than 0.03 wt % of sulfur, less than 0.03 wt % of phosphor, less than 0.05 wt % of oxygen, 0.05 wt % of nitrogen, and an balanced amount of iron before forging the spring steel. 
     
     
         13 . The method for manufacturing the golf club head as claimed in  claim 1 , wherein quenching the club head body results in a surface hardness of HV 267-700 of the club head body. 
     
     
         14 . The method for manufacturing the golf club head as claimed in  claim 1 , wherein quenching the club head body results in a tensile strength of 240-310 ksi of the club head body. 
     
     
         15 . The method for manufacturing the golf club head as claimed in  claim 1 , wherein quenching the club head body results in a yield strength of 200-240 ksi of the club head body.