Patent ID: 9021846
Filing Date: 2015-05-05
Classification: B21D

Abstract:
1. A hydroforming method for metal comprising: preparing a hydroforming mold, with the hydroforming mold including side dies, a punch, and a push rod to define a die cavity having a peripheral wall including corners; providing a metal embryo, with the metal embryo including a bottom and a plurality of side walls having top edges, with the bottom and the plurality of side walls together defining an interior space, with the interior space having an opening; placing the metal embryo into the die cavity, with the punch pressing against the bottom of the metal embryo, with the push rod facing the opening; filling the interior space of the metal embryo with a working fluid via the opening of the metal embryo, with the working fluid exerting a pressure on the metal embryo; moving the push rod toward the die cavity, with the push rod pressing against the working fluid and the top edges of the plurality of side walls of the metal embryo to bulge the plurality of side walls of the metal embryo; and moving the punch toward the die cavity to bulge the metal embryo to abut the peripheral wall of the die cavity and to fill corners of the peripheral wall of the die cavity, forming a hardware, wherein the punch is moved away from the die cavity while the push rod is moving toward the die cavity, and a velocity of the punch is smaller than a pushing velocity of the push rod.