HYDRAULIC DRIVE FOR A DIE CUSHION DEVICE OF A PRESS MACHINE

The invention relates to a hydraulic drive for a hydraulic spindle, such as a die cushion device of a press machine for example, comprising a fluid pump for providing a volumetric flow for a drawing process from a fluid supply to a hydraulic cylinder of the die cushion device and from the hydraulic cylinder to the fluid supply. According to the invention, the hydraulic drive comprises a motor pumpunit, a circulation line, and a valve device, wherein the valve device is arranged between the fluid pump and the hydraulic cylinder, a volume flow from the fluid pump to the hydraulic cylinder and/or from the hydraulic cylinder to the fluid pump can be conducted via the valve device, and a circulation volume flow can be circulated from the fluid supply to the fluid pump and from the fluid pump to the fluid supply by means of the fluid pump via the circulation line. The invention additionally relates to a method for controlling such a hydraulic drive. 本发明涉及一种针对液压轴、例如压力机的拉伸垫设备的液压驱动器，该液压驱动器带有流体泵，流体泵用于针对拉伸过程将体积流从流体贮存器提供