Golf club head fabrication method

A golf club head fabrication method including the steps of:

• i) preparing a rubber mixture by mixing a rubber with fillers, then pre-warming the rubber mixture thus obtained in a material tank of an injection molding machine at a temperature of about 60.degree. C., and then delivering the pre-warmed rubber mixture to an injection molding tube of the injection molding machine which is heated to a temperature of about 70.degree. C.;
• ii) preparing a club head casing having a front open chamber at its front side, a filling hole at one side in communication with said front open chamber, and an inside flange raised from a bottom side of said front open chamber around the border, then welding a face panel to the inside flange of said club head casing to close said front open chamber, and then filling a bonding agent through said filling hole into said front open chamber, and then pre-heating said club head casing at a temperature of about 100.degree. C. for about 480 second;
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• iii) injecting said pre-warmed rubber mixture into said filling hole by said injection molding machine at an injection velocity of about 3.0 cm/sec, an injection pressure of about 100 kg/cm.sup.2, a mold closing pressure of about 150 kg/cm.sup.2, and an injection time of about within 10 seconds to 30 seconds, to mold a shock absorbing rubber in said front open chamber through a vulcanization process.