| 摘要 |
PROBLEM TO BE SOLVED: To improve characteristics of an iron-type golf club by performing surface treatment on a soft-iron forged head in particular for satisfying functions required for the iron golf club such as (1) spin performance, (2) trajectory directionality, (3) striking sensation, (4) swinging-through sensation, (5) distance controllability, and (6) flyer amelioration.SOLUTION: An underlayer of an electroless Ni-P plating film is formed at the entire surface of a soft-iron forged head, and a surface layer of an electroless Ni-P-W plating film is formed on the entire surface of the underlayer. When forming the electroless Ni-P-W plating film, heat treatment is performed in the range of 300-700°C. The head is a wedge-type head comprising a pitching wedge, an approach wedge, or a sand wedge. |
