PURPOSE: To shorten the forming time of a wheel for vehicle and to improve the size accuracy and the yield.
CONSTITUTION: A press-forming method of the wheel for vehicle is the method for press-forming a cupped blank 15 having a disk part 16 and circular wall part 17 corresponding to a rim of the wheel for vehicle. Then this method contains a pushing process for obtaining a preformed material 44 which has the outer peripheral surface having the outer diameter of the rim or smaller, by pressing the disk part 16 from the outside with a first punch 31 and pushing the circular wall part 17 into a gap 40 which is formed between a first mandrel 36 and a first die 39 arranged in the outer periphery of the first mandrel 36 and has larger shape than a forming scheduled rim shape, to form the circular wall part 17 and a forming process for forming to the aimed shaped rim by laying the circular wall part of the preformed material 44 in a second die 49 having the inner peripheral surface which has the same shape as the outer peripheral surface of the rim, and inserting a second punch 43 having the outer peripheral surface which has the same shape as the inner peripheral surface of the rim, into the second die 49.
OGITA TAKESHI
HONDA HIROYUKI
