PUNCH FOR DRAW-FORMING OF BODY DETAILS Russian patent published in 2009 - IPC B21D22/20 

FIELD: metallurgy.

SUBSTANCE: punch consists of die, of blank holder with constriction threshold and of matrix with upper holding surface, opening and recess for constriction threshold. Also the matrix has the first and the second drawing edges. The recess for the constriction threshold facilitates a gap relative to the constriction threshold equal to thickness of punched material with regard to its positive thickness allowance. Contour of matrix opening is formed with regard to the said recession. Surface of contact with the billet of the said recess is formed with the first drawing edge of the matrix, with side surface of the recess and with the second drawing edge of the matrix traversing to upper holding surface of the matrix.

EFFECT: upgraded accuracy and quality of drawn details with saving of sheet material.

4 dwg