COLD PRESS MOLDING METHOD FOR CONTROLLING THE RISING PRESSURE OF A BLANK HOLDER CAPABLE OF PREVENTING A CRACK ON A PRODUCT

摘要

PURPOSE: A cold press molding method for controlling the rising pressure of a blank holder is provided to make the rising pressure of a blank varied according to the degree of molding or the progressive degree of a stroke, thereby preventing a crack on a product during a molding process.;CONSTITUTION: A cold press molding method for controlling the rising pressure of a blank holder comprises the following steps. A blank is molded by a press device including a lower mold(120), an upper mold(130) and a blank holder(150) interlocked with the upper mold. The lifting pressure of the blank holder is varied according to the descending of the upper mold. The initial and last stage of molding has a high rising pressure, while the intermediate stage of molding has a low rising pressure.;COPYRIGHT KIPO 2013