| 摘要 |
A sheet hydroforming system utilizing multi-separated blank holder pressure is provided to improve formability such that a formed article with high quality is produced by forming an article with a deep forming depth such as an automobile outer panel using a material with a relatively low partial elongation such as aluminum. A sheet hydroforming system utilizing multi-separated blank holder pressure comprises: a die(10) fixed to an installation face; a press ram(20) lifted and lowered in an upper side of the die; a punch(30) fixed to the central bottom of the press ram; a plurality of cylinders(40) fixed onto the bottom of the press ram and arranged in such a shape that the cylinders make a round of the outer periphery of the punch; pistons(50) lifted and lowered according to hydraulic pressure in the cylinders; blank holders(60) which make a round of the outer periphery of the punch, and are supported to lower ends of the pistons; and a hydraulic unit for controlling the hydraulic pressure in the cylinders.
|
