METHOD FOR DRAWING PARTS OF SHEET MATERIAL (VARIANTS) Russian patent published in 2007 - IPC B21D22/22 

FIELD: sheet forming processes and equipment.

SUBSTANCE: method comprises steps of pressing edge portion of blank and further pulling-in of edge portion of blank to gap between punch and die. According to first variant after pressing edge portion of blank, in central portion of blank recesses are formed at preliminarily defining blank surface due to thinning material. Then at the same transition defined surface of blank is smoothed and pulled-in and simultaneously edge portion of blank is pulled-in to gap between punch and die for forming wall of three-dimensional part. According to second variant edge portion of blank is pressed and further pulled-in to gap between punch and die at press stroke downwards. After pressing edge portion of blank, initial stage of drawing is realized by non-full depth of part. Then recesses are formed in blank central portion and preliminary blank surface is defined due to thinning material. At final stage of drawing defined surface of blank is smoothed and pulled-in and simultaneously edge portion of blank is pulled-in to gap between punch and die for forming wall of three-dimensional part.

EFFECT: lowered labor consumption of drawing process, improved quality of drawn part due to increased limit depth of drawing.

2 cl, 2 dwg