FORMATION OF DISK PART HAVING THROUGH-HOLE, MANUFACTURE OF WHEEL FOR AUTOMOBILE PROVIDED WITH DISK HAVING THROUGH-HOLE AND HOT-FORGING APPARATUS

摘要

PROBLEM TO BE SOLVED: To prevent the development of a working waste which is low regenerating ratio, and also, to form a through-hole with a simple equipment, in a method for forming a disk part having the through-hole. ;SOLUTION: In the method for forming the disk part 12 having the through- hole by using a hot-forgable material, a recessed part forming process, in which the recessed part 11 opened on the surface and provided with a bottom wall 16 projected on the rear surface is formed and simultaneously, the thickness in the boundary range connected with the outside from the bottom wall 16 is set to 0.1-3 mm, and a bottom wall removing process, in which the bottom wall wall 16 and the outside thereof are separated at the boundary range and the through-hole is formed, are provided with a hot-forging from the above material.;COPYRIGHT: (C)2000,JPO