Patent ID: 7086265

Claim:
A method for controlling the material flow during the deep-drawing of sheet metal plates, the method comprising: forming the sheet metal plate in a press between a die stamp arranged at a base plate and a matrix arranged at a top plate; providing the die stamp and the matrix with adapted profiled sections for the formation of die beads at the edges of said sheet metal plate compressing the edges of said sheet metal plate between at least one upper sheet metal stopper and at least one lower sheet metal stopper during the deep-drawing process, applying a controllable spring load; initially, as the upper and lower sheet metal stoppers are closed, stamping a Z-shaped blocking step into the sheet metal plate edge; then, by maintaining the blocking step and a complete blocking between said sheet metal stoppers, completing the drawing of the base form, with said sheet metal plate being stretched-out from inside to outside; and finally, reducing the blocking step in its height, thus facilitating the sheet metal trailing from outside.