Patent ID: 6474196
Filing Date: 2002-11-05
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, the master die having a working surface partially defining to die cavity; while a first blank sheet is disposed between the master die and the master punch, relatively reciprocating the master die and the master punch together, thereby press-forming the first blank sheet into a press-formed panel complementary in contour to the shape of the die cavity; cutting down the working surface of the master die by a predetermined depth of cut; fitting the press-formed panel over the master punch; while a second blank sheet having a thickness equal to the predetermined depth of cut of the working surface is disposed between the master die and the press-formed panel fitted over the master punch, relatively reciprocating the master die and the master punch together, thereby press-forming the second blank sheet 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.