| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable a clubface which hardly gives rises to plastic deformation in a clubface member at the time of hitting a ball and is capable of exhibiting high elastic force regardless of the different values of a head speed by forming at least the fitting surface of a face part of a metallic material having prescribed specific yield strength and elastic modulus. SOLUTION: A head body 2 exclusive of the face member 1 is formed of a stainless steel (sp. gr. 7.9) and the sweet area portion 1A of the face member 1 is formed of an aluminum-scandium alloy (sp. gr. 2.9) of 2.5 mm in thickness. The face part 1 is fitted to a peripheral edge 2A of the inner peripheral of the head body 2 and at least the hitting surface thereof is formed of the metallic material having the specific yield strength of >=200 and the elastic modulus (GPa) of <=80. The face member 1 is extremely small in sp. gr. and large in the specific yield strength and is small in the elastic modulus and, therefore, there is no need to make the thickness of the face member 1 extremely small and even if the thickness exceeds 3 mm, the so-called peripheral weight distribution is made possible.</p> |
