HYDRAULIC PRESS (VERSIONS) Russian patent published in 2003 - IPC

FIELD: metal working. SUBSTANCE: invention relates to plastic metal working and it can be used in stamping, mainly short-stroke stamping, for instance, die stamping. According to first design version, press contains power hydraulic cylinder, pump-hydraulic motor with flywheel on its shaft, electric motor and hydraulic distributor. The latter provides alternate connection of pressure space of power hydraulic cylinder to outlet and inlet chambers of pump-hydraulic motor. Inlet chamber is connected through check valve with working liquid make-up hydraulic line. Press is furnished also with blank feeding device and self-contained drive for changing over hydraulic distributor connected with blank feeding device. Pneumohydraulic accumulator with divider is connected to pressure space of power hydraulic cylinder. According to second design version, press is furnished with second power hydraulic cylinder independent from first one. Pneumohydraulic accumulators with divider are connected to pressure spaces of power hydraulic cylinders. In this case hydraulic distributor provides alternate connected of pressure spaces of power cylinders to outlet and inlet chambers of pump-hydraulic motor. EFFECT: increased capacity of press, reduced metal usage and energy losses in hydraulic drive. 11 cl, 2 dwg