| 摘要 |
<p>PURPOSE: To expand a sweet area while ensuring sufficiently the strength of a face part. CONSTITUTION: A head body 1 has 1mm or more and 2.5mm or less of the thickness between the bottom surface 11a of a cavity 11 at the back 3 side and a face 2, and the face 2 of the head body 1 made of steel is subjected to cementation quenching by which the strength of the face 2 part is ensured while the thickness (a) can be thinned. According to the thinning, the weight distribution of the head body 1 is more he peripheral part to expand a sweet area.</p> |
