| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain strength characteristics, excellent in high impact resistance and high toughness, by forming the face body of a golf club head of a hybrid of a metallic glass phase and a crystalline phase. SOLUTION: The club head 2 is constituted by mounting the face body 1 hybrid with the metal glass phase layer G and the crystalline phase layer K in a recessed part 31 for fitting disposed on the face 1a side of the head body 30. The production of such face body 1 is executed by first installing a metallic material 26 on a die 5 of press molds consisting of a punch 4 and a die 5, melting this material 26 by using, for example, an arc electrode 8 and pressing the resultant molten metal of a m.p. or above with the punch 4 and the die 5 to deform the molten metal to a prescribed shape, then cooling part of the molten metal simultaneously with the deformation at the critical cooling rate or above, thereby forming the metal glass. The other part of the molten metal which exists between the molten metal and the die 5 and has the temp. lower than the molten metal by contact with the die 5 is cooled and deformed, by which the crystal phase hybrid with the metal glass phase is formed and the face body 1 of the prescribed shape is manufactured.</p> |
