Hydraulic drive for a sheet metal forming press
    1.
    发明授权
    Hydraulic drive for a sheet metal forming press 失效
    钣金成型机的液压驱动

    公开(公告)号:US5499525A

    公开(公告)日:1996-03-19

    申请号:US142490

    申请日:1994-05-20

    CPC classification number: B30B1/266 B21D24/08 B21D24/14 B30B15/16

    Abstract: The invention relates to a drive for a press, in particular for a sheet metal forming press, the press including a press ram which can be moved up and down and a hydraulic movable counter support. The counter support can be moved in a forward stroke in the direction towards the press ram via at least one hydraulic cylinder by a first hydrostatic machine, and in a return stroke by the press ram. In known presses, during the return stroke of the counter support, the pressure medium is displaced from the hydraulic cylinder while a predetermined pressure is maintained by means of a pressure relief valve (pressure limiting valve) or a throttle valve (flow control valve). The balance sheet of energy of such a drive of such a press is to be improved. This is achieved by providing that the first hydrostatic machine is a pressure controlled machine, preferably an axial piston machine. Preferably, the axial piston machine can be swiveled in both directions, i.e. pivoted towards both sides. Further, at least during a portion of the return stroke of the counter support, pressure medium from the hydraulic cylinder flows across a second hydrostatic machine.

    Abstract translation: PCT No.PCT / DE93 / 00275 Sec。 371日期1994年5月20日 102(e)日期1994年5月20日PCT 1993年3月25日PCT公布。 WO93 / 19866 PCT公开号 日本特开1993年10月14日。本发明涉及一种用于压力机的驱动装置,特别是一种用于金属板成型压力机的压力机,该压力机包括可以上下移动的压力冲杆和一个液压可移动的支架。 相对支撑件可以通过第一静液压机器经由至少一个液压缸并且在通过压力机压头的返回行程中沿朝向压头压头的方向向前行程移动。 在已知的压力机中,在反向支撑件的返回冲程期间,压力介质从液压缸移位,同时通过减压阀(限压阀)或节流阀(流量控制阀)保持预定的压力。 这种压机的这种驱动的能量的资产负债表要改进。 这通过提供第一静液压机是压力控制的机器,优选的是轴向活塞机来实现。 优选地,轴向活塞机可以在两个方向上旋转,即朝向两侧枢转。 此外,至少在对向支撑件的返回行程的一部分期间,来自液压缸的压力介质流过第二静液压机器。

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