Golf ball manufacturing method
AssigneeBridgestone Sports Co., Ltd.
InventorMasaki Shiraishi
Life of this patent
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Abstract
A method for manufacturing a golf ball having a core and a cover of at least one layer includes the step of molding the cover layer with a vertically separating two-part injection mold which has a spherical cavity and three or more support pins disposed so as to be capable of advancing and retracting in a direction perpendicular to a mold parting line, each support pin being housing in a pin housing hole having a nitrided inner peripheral sidewall. This method enables a golf ball cover material to be molded using an injection mold which, because a thick plating of hard chrome does not need to be applied to the inner peripheral sidewalls of the holes housing the support pins, is inexpensive and in which the pin housing holes have a good abrasion resistance.
Claims9
A method for manufacturing a golf ball having a core and a cover of at least one layer, which method comprises the step of:
- molding at least one layer of the cover with a vertically separating two-part injection mold, wherein the injection mold has a spherical cavity and three or more support pins disposed so as to be capable of advancing and retracting in a direction perpendicular to a parting line of the mold, each support pin being housed in a pin housing hole having an inner peripheral sidewall that is made by a nitriding treatment.
Dependencies are inferred from the claim text.