GOLF CLUB HEAD

PURPOSE:To provide the ball driving feeling similar to that of a wooden head and easily control the curve of a driven ball by manufacturing a golf club head with a superelastic Ni-Ti alloy by the lost wax precision casting. CONSTITUTION:A superelastic Ni-Ti alloy is composed of 56 + or -0.5wt.% of Ni and the remainder of Ti. Some alloy constituent such as Nb, V, Cr may be added for use, however, a head must have an austenitic structure at its operating temperature to provide superelasticity, thus an alloy composition having the transformation temperature higher than -10 deg.C must be provided. The head can be manufactured by the normal lost wax precision casting, however, the activated metal casting technology is preferably used. The head made of the superelastic metal is considerably bent centering on the portion kept in contact with a ball at the instant when the ball is driven, thus the contact area between the ball and the head is large, and the contact time is long. The condition of a curve can easily be controlled.