Control system for sheet-metal deep drawing press - with the drawing velocity varied as a function of the sheet holder velocity

摘要

The control system is intended for a deep drawing press including a drawing tool (a male die 4, a female die 3). In such a tool the metal sheet (6) is clamped - by means of rods (7) and one or several hydraulic cylinders (9) - between the surrounding area of the die (3) and a sheet holder (5) carried along by the die (3). The cylinder pressure is regulated by an output signal (Ra) from a regulator (R) comparing the actual pressure variation (Pi) with the required pressure variation (Ps). The system is characterised by the fact that a drawing velocity (Zg) is derived from the velocity of the sheet holder (5) and that the pressure variation (Ps) is fed to both the regulator (R) and a computer (C). The latter combines the quantities (Zg) and (Ps), and issues the result as an influence signal (B) superimposing the signal (Ra). USE/ADVANTAGE - The invention can be used with deep drawing presses. In comparison with the existing methods, it enables the quality of deep-drawn components to be further improved by allowing variations of additional process parameters to be taken into account during the drawing operation.