METHOD FOR CONTROLLING THE MATERIAL FLOW DURING THE DEEP-DRAWING OF SHEET METAL, AND DEEP-DRAWING TOOL

摘要

The invention relates to a method for controlling the material flow during the deep-drawing of sheet metal, the edges of the sheet metal (1) being compressed between at least one upper stopper (13) and at least one lower stopper (6, 7) during the deep-drawing process, with a controllable elastic force (8, 9). The invention also relates to a corresponding deep-drawing tool. According to the invention, a Z-shaped blocking step (11) is stamped into the edge (1a) of the sheet metal when the upper and lower stoppers (13, 6, 7) are closed, the basic shape is then produced by deep-drawing, maintaining the blocking step (11) and completely blocking the sheet metal between the stoppers, said sheet metal (1) being outwardly stretched, and the blocking step (11) is then reduced in terms of height, facilitating the outward displacement of the sheet metal towards the outside. The deep-drawing tool is characterised in that the lower stopper consists of an inner stopper (6) and an outer stopper (7), which are arranged in an annular manner on the edge of the sheet metal (1) and can be displaced in relation to each other in the holding direction.