Abstract: A method for manufacturing a blisk includes an intermediate product molding step of molding a blisk intermediate product including a circular disk-corresponding part, a plurality of rotor blade-corresponding parts, and bridges each connecting a front edge of one of each pair of the rotor blade-corresponding parts adjacent to each other and a rear edge of the other one of the rotor blade-corresponding parts. The method for manufacturing the blisk further includes a disk finishing step of cutting the disk-corresponding part so as to finish the disk-corresponding part into the disk in a product form, and a rotor blade finishing step of cutting each bridge so as to finish the respective rotor blade-corresponding parts into the respective rotor blades in a product form.

Abstract: A method for manufacturing a blisk includes an intermediate product molding step of molding a blisk intermediate product including a circular disk-corresponding part, a plurality of rotor blade-corresponding parts, and bridges each connecting a front edge of one of each pair of the rotor blade-corresponding parts adjacent to each other and a rear edge of the other one of the rotor blade-corresponding parts. The method for manufacturing the blisk further includes a disk finishing step of cutting the disk-corresponding part so as to finish the disk-corresponding part into the disk in a product form, and a rotor blade finishing step of cutting each bridge so as to finish the respective rotor blade-corresponding parts into the respective rotor blades in a product form.

Abstract: A set of golf clubs, has irons with their loft angles decreasing inversely proportionately to the lengths of shafts and their grounding edges formed on their soles such that they are swept back or regressed inversely proportionately to the lengths of the shafts. Thus, the longer irons for hitting up the ball are allowed to have their faces confront the ball accurately, and the shorter irons for hitting down the ball are allowed to have their faces hit it through.

Abstract: A head structure for a golf club, has a head body having a face for providing a ball hitting surface and a balancing weight made denser than the head body which is press-fitted so firmly on the head body that it may not come out. The press-fitting is accomplished by a combination of dovetail joint or the like. The dovetail joint includes a fitting mortise flaring towards its bottom and extending longitudinally of one of the head body and the balancing weight, and a corresponding fitting tenon flaring to have a width diminishing towards its root and extending longitudinally of the other so that it may be firmly fitted in the mortise.