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[CN 201711051799.7] Title of Die Cushion Device of Press: Application Number of Die Cushion Device of Press: CN 201711051799.7 Applicant: Application Date of Huita Engineering Technology Co., Ltd.: 2017-10-31 Patent Type: Invention Application for Die Cushion Device of Press (10), including a hydraulic cylinder (3) supporting a cushion pad (2) and generating a die cushion force when a slide of a press is lowered, an orifice and a hydraulic pump/motor (4) interconnected in parallel between a container (9) and a lower chamber (3c) of the hydraulic cylinder (3), a servo motor (5) connected to a rotating shaft of the hydraulic pump/motor (4), and a torque of the servo motor (5) is controlled to control the control unit of the mold buffer force, herein, during the generation of the die cushion force, the rotation direction of the servo motor (5) is switched from the first rotation direction in which the hydraulic pump/motor (4) is used as the hydraulic motor to the second rotation direction in which the hydraulic pump/motor (4) is used as the hydraulic pump.
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