METHOD OF DRAWING COMPLEX-SHAPE PARTS OF MOTOR VEHICLE BODY Russian patent published in 1997 - IPC

FIELD: drawing of different parts of sheet materials. SUBSTANCE: method of drawing complex-shape parts of motor vehicle body with deeply stamped out portions comprises steps of holding down peripheral and central portions of blank having at least one preliminarily punched technological opening in zone of said deeply stamped out portion; holding down central portion of blank by means of punch at its working stroke acting upon lower inner holder arranged along perimeter of central stamped out portion and at initial moment of drawing process placed in level of hold surface by means of power cylinders; deenergizing said cylinders at moment just before removal of formed part. Hold surface in zone of said central stamped out portion is arranged equidistantly relative to surface of said central stamped out portion of part. EFFECT: enhanced efficiency. 2 cl, 7 dwg