DEVICE, PLANT AND METHOD OF SHEET METAL WORKPIECE FORMING, AND PART, PRODUCED ACCORDING TO THIS METHOD Russian patent published in 2017 - IPC B21D22/22 B21D24/04 B21D24/10 

FIELD: metallurgy.

SUBSTANCE: provide the sheet metal workpiece forming into the sleeve. The forming device includes the punch with the bottom forming section and the wall forming section, the ring workpiece holder, surrounding the punch and having the support surface for positioning the drawn edge, the inner matrix with the bottom forming section and the outer matrix with the wall forming section and the clamping section for gripping the drawn edge and for its pressing against the support surface of the workpiece holder. The workpiece is placed in the open forming device. During the first moulding step, the inner matrix and the outer matrix and the workpiece holder are moved in the drawing direction along with the clamped workpiece. After the workpiece is clamped between the clamping section of the outer matrix and the support surface of the workpiece holder, the two matrices are moved together in the same direction at different speeds. During one of the moulding process stages the inner matrix overtakes the outer matrix, or vice versa.

EFFECT: reduction of ruptures at the workpiece edge sections.

12 cl, 9 dwg