METHOD FOR DRAWING COMPLEX-SHAPE BODY PARTS Russian patent published in 2005 - IPC

FIELD: cold sheet forming processes and equipment.

SUBSTANCE: method comprises steps of shaping braking members by means of die lip and recess of holder for lip; pressing peripheral part of blank to die with lip; acting by deforming effort onto central portion of blank and simultaneously braking blank portion by means of constriction lip. Cylindrical portion of constriction lip is made in the form of protrusion having desired height and radius at apex equal to radius of die. Upper surface of recess of lip is joined by means of respective radius. Flange of blank is braked at drawing it through gap between cylindrical portion of holder recess for lip and flat portion of surface of pressing lip of die. Minimum gaps are provided between said surfaces; said gaps are equal to initial thickness of blank while taking into account positive allowance for sheet thickness. Flange of blank is also braked due to sign-variable bending of blank flange moved between protrusion of constriction lip and cylindrical portion of holder recess for lip of die .

EFFECT: improved braking degree and tension intensity of blank metal.

3 dwg