HYDRAULIC PRESS BRAKE

HYDRAULIC PRESS BRAKE

The pump discharge flow rate of a bidirectional piston pump (31) is set to a reference pump discharge flow rate Qa if the operation state of a lifting/lowering cylinders (15) is in a no-load state, and is set to a small-flow-rate pump discharge flow rate Qb that is smaller than the reference pump di...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: OKUBO, TAKANORI, YUKITA, TOMOHIRO, NAKAMURA, AKIRA
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:The pump discharge flow rate of a bidirectional piston pump (31) is set to a reference pump discharge flow rate Qa if the operation state of a lifting/lowering cylinders (15) is in a no-load state, and is set to a small-flow-rate pump discharge flow rate Qb that is smaller than the reference pump discharge flow rate Qa if the operation state of the lifting/lowering cylinders (15) is in a high-load state. The value Qb·Pb found by multiplying the pump discharge flow rate Qb and the pump discharge pressure Pb of the bidirectional piston pump (31) for when the operation state of the lifting/lowering cylinders (15) is in a high-load state is set substantially equal to or less than the value Qa·Pa found by multiplying the pump discharge flow rate Qa and the discharge pressure Pa of the bidirectional piston pump (31) for when the operation state of the lifting/lowering cylinders (15) is in a no-load state.