HYDROFORMED PART, METHOD FOR HYDROFORMING THE FORMED PART AND VEHICLE MEMBER USING THE HYDROFORMED PART

摘要

PROBLEM TO BE SOLVED: To provide a hydroformed part capable of improving quality of a product in which an outer diameter is gradually changed to small/large. SOLUTION: The hydroformed part is made by subjecting a tube stock 18, which changes an outer peripheral shape corresponding to a change in the outer shape of a product 14, to hydroforming, even in the case of the product 14 having the outer shape section gradually changing the outer diameter to small/large, the high quality product 14 accommodating a tube expansion rate in a restrict range is obtained.