B - Operations – Transporting – 30 – B
Patent
B - Operations, Transporting
30
B
B30B 15/16 (2006.01) B30B 15/18 (2006.01)
Patent
CA 2676045
The invention relates to a method and a device for controlling the synchronization of cylinder/piston units for counterforce rams and/or vee rings and for reducing pressure peaks during the fineblanking and/or forming of workpieces on a fineblanking or stamping press equipped with at least one tool. The basic object of the invention is to provide a method and a device for controlling the synchronization of cylinder/piston units and at least one main ram and for reducing pressure peaks during forming and/or fineblanking on fineblanking or stamping presses, which discharges any recoil caused by the impact between the punch and the workpiece, independently of quantity, from the controlling of the working pressure of the hydraulic fluid, bringing about a marked improvement in the synchronization properties of the cylinder/piston units and the main ram through a constant pressure characteristic in the hydraulic system including with high cycle times and speeds. This object is achieved in that first of all the cylinder/piston units 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 said 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 via a central control unit, whereby a rise in pressure caused by the impact between the tool and the workpiece is regulated, independently of quantity, from the pressure (P3) in the second accumulator to a permissible set pressure by discharging a significant part of the pressure pulse into a separate tank, and that the available cushion pressure allows ejection of the workpiece to be synchronized with retraction of the press ram.
Juhasz Francois
Schaltegger Markus
Winkler Thomas
Feintool Intellectual Property Ag
Riches Mckenzie & Herbert Llp
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