Patent ID: 8172699

Claim:
A method for manufacturing a golf club head, the golf club head comprising a clubface for striking a ball, the clubface comprising a contact face and face grooves, and a metallic skin covering the contact face and interior surfaces of the face grooves, the method comprising the steps of: forming the face grooves in the clubface by pressing a die onto the clubface, wherein the die has a principal surface and ribs protruding from the principal surface, the ribs arranged in a pattern corresponding to the inverted shape of the face grooves be incused; forming the metallic skin on the clubface including the interior surfaces of the face grooves so that the surface roughness Ral of the metallic skin on the interior surfaces of the face grooves is not more than 0.20 micrometers; masking the interior surface of the face grooves with a masking agent; blasting abrasive to at least a central part of the clubface so that said at least central part excluding the face grooves has a surface roughness of more than 0.20 micrometers; and removing the masking agent from the face grooves, wherein the method further comprises a step of forming auxiliary grooves in the clubface prior to the step of forming the face grooves, wherein the auxiliary grooves each have a depth of from 0.005 to 0.025 mm and a width of from 0.10 to 0.50, and sidewalls inclined at an angle θ1 of from 40 to 70 degrees to become wider toward its opening at the clubface, and wherein the auxiliary grooves are formed by pressing a die onto the clubface, the die having a principal surface and ribs protruding from the principal surface, and the ribs arranged in a pattern corresponding to the inverted shape of the auxiliary grooves be incused.