PRESS FORMING METHOD

摘要

PURPOSE: A press forming method is provided to minimize the decline of the whole process cycle speed and simultaneously to reduce the phenomenon of spring back by delaying the stroke speed of an upper mold near a bottom dead center. CONSTITUTION: A press forming method comprises the following steps. The stroke is progressed while provisionally stopping an upper mold from the predetermined start point of constrained forming to the bottom dead center(BDC) in the middle of descending of the upper mold and performing a stroke. The starting point of constrained forming is fixed on the section between 4-8mm before reaching the bottom dad center. [Reference numerals] (AA) Falling; (BB) Rising; (CC) Stroke; (DD) Time;