Patent ID: 6484609
Filing Date: 2002-11-26
Classification: B21D,B23P

Abstract:
A method of producing a press-forming die, comprising the steps of:preparing a master die and a master punch relatively movable toward and away from each other so as to define therebetween a die cavity; relatively reciprocating the master die and the master punch together while a first blank sheet is disposed between the master die and the master punch, thereby press-forming the first blank sheet into a press-formed panel complementary in contour to the shape of the die cavity. while a second blank sheet is disposed between the in master die and the master punch, relatively reciprocating the master die and the master punch together with a stroke smaller than the stroke achieved when the press-formed panel is produced, thereby producing a half-pressed panel; applying an elastic material onto one surface of the half-pressed panel which has been situated in face to face with the master die; fitting the press-formed panel over the master punch and placing the half-pressed panel over the press-formed panel with the elastic material facing away from the press-formed panel; forcing the half-pressed panel against the press-formed panel via the elastic material to thereby shape the half-pressed panel into a die panel complementary in contour to the shape of the press-formed panel; and applying a back-up material to the rear surface of the die panel to thereby produce a press-forming die.