Method and apparatus for closed loop control of ram motion and ram force in a multipoint servo hybrid press

摘要

The present invention relates to a method for closed loop control of ram motion and ram force in a multipoint servo hybrid press. In the method, a servo motor drive unit corresponding to each pressing point or each pressing point group of the ram as a main functional unit is a hydraulic type within the pressing point of the ram driving unit via the conductive shaft function unit. It forms a combined interaction with the drive integrated in the press as a secondary function in the form of a pressure pad and / or a process pad acting as a mechanical or mold pad, thereby In the prior to and during the closing phase for molding and full curing of the thermoforming press member, a high closing force of the ram is obtained with reduced drive power, and after the closing phase a low opening force of the ram is obtained. And, on the other hand, hydraulic pads and / or processes within the pressure points of the ram in order to compensate for process variations caused by variable mechanical and thermal influences on the properties of the hot pressed material Package Depending on the distance and force, due to the closed loop control of the active penetration depth and inclination before, during and after the closing phase of the ram in the region of the lower reversal point, respectively, In combination with the main drive, closed-loop control is possible independently of one another.