| 摘要 |
<p>PURPOSE:To manufacture the golf club shaft having high rigidity by winding a prepreg to a mandrel, inserting a cylindrical preformed body obtained by heat-forming into a hollow cylindrical forming die and executing heat-forming, while applying pressure to the outside from the inside of the preformed body. CONSTITUTION:A prepreg consisting of a reinforced fiber and a thermoplastic resin is wound to a mandrel 1, a heat resisting non-adhesive tape 3 is wound thereon and tightened, and thereafter, by heating it to a melting temperature or above of the thermoplastic resin, the prepreg 2 is melted, and it is unified by joining each layer. After cooling it, when the tape 5 is removed, the mandrel 1 is drawn out and a hollow tapered preformed body 4 is obtained. Subsequently, the preformed body 4 is installed in the inside of a forming die 5 which is hollow and cylindrical, whose inside surface 6 is tapered, and also, in which plural step differences 7... are formed in the longitudinal direction, its inside surface is covered with a flexible cover tube 11, and by operating an exhaust device, air in the gap between the forming die 5 and the preformed body 4 is exhausted. Next, the forming die is contained in an autoclave 10, and set to a heated and pressurized state. Thereafter when the inside of the autoclave 10 is cooled, the forming die 5 is taken out and removed, and a shaft 12 is obtained.</p> |
