PRESS BRAKE AND METHOD OF CONTROLLING BIDIRECTIONAL FLUID PUMP OF HYDRAULIC CYLINDER OF PRESS BRAKE

A controller (18) controls an AC servomotor (39) to reverse the rotation of a bidirectional piston pump (31) so as to reverse the vertical movements of a ram (5U). At this time, a command generator (65) of the controller (18) maintains the ram (5U) at a constant speed for a predetermined warm-up tim...

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Bibliographische Detailangaben
1. Verfasser:	ARIJI, NOBUAKI
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS HEATING HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PRESSES PRESSES IN GENERAL PUNCHING METAL SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL TRANSPORTING WEAPONS WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A controller (18) controls an AC servomotor (39) to reverse the rotation of a bidirectional piston pump (31) so as to reverse the vertical movements of a ram (5U). At this time, a command generator (65) of the controller (18) maintains the ram (5U) at a constant speed for a predetermined warm-up time after a reverse of the ram movement and change the ram speed to a predetermined speed. A command position counter (67) reads the ram position from the ram speed pattern, and an adder (73) sums the read value and the actual position of the ram (5U) detected by a position detector (11) to control the rotation of the AC servo motor (39).