| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of and a device for reducing pressure peaks during the fine blanking and/or forming of a workpiece on a press. SOLUTION: The object is achieved in that first of all the cylinder/piston units 1 are continuously maintained at a preadjustable cushion pressure P1 and that the cylinder/piston units are then subjected to a preadjustable displacement pressure P2 from a connectable high-pressure source, with the pressure being set to a pressure PU varying between the cushion pressure P1 and the pressure for forming and/or blanking by supplying a separate control oil quantity to a second accumulator 19 via a central control unit, whereby a rise in pressure caused by the impact between a tool and a workpiece is regulated, independently of quantity, from the pressure P3 in the second accumulator 19 to a permissible set pressure by discharging a significant part of the pressure pulse into a separate tank 22, and that the available cushion pressure allows ejection of the workpiece to be synchronized with retraction of a press ram. COPYRIGHT: (C)2010,JPO&INPIT |
