Method and device for controlling the synchronism of cylinder/piston units and for reducing peak pressure during forming and/or fine blanking in presses

摘要

The method involves maintaining a cylinder/piston unit (1) at a preadjustable cushion pressure (P1) by an accumulator (10) e.g. bladder accumulator. The unit is subjected to a preadjustable displacement pressure. A rise in pressure in the form of a pressure pulse caused by impact between a tool e.g. punch, and a workpiece is regulated, independently of quantity of control oil, from a displacement pressure (P3) in another accumulator (19) to a permissible set pressure, where available cushion pressure allows synchronization of ejection of the workpiece with retraction of a press ram. An independent claim is also included for an apparatus for controlling a piston/cylinder unit for a counterforce ram or vee ring and for reducing pressure peaks during fineblanking or forming of workpieces on a fineblanking or stamping press.