DEVICE FOR HYDRAULIC DRIVING OF MACHINING MACHINES, SUCH AS MACHINES FOR PROCESSING METALS BY PRESSURE, AND METHOD OF DRIVING SIMILAR MACHINES FOR PROCESSING METALS BY PRESSURE

摘要

1. A device for driving metal forming machines, such as forging machines, forging and stamping presses or extrusion presses, by means of pressurized fluids having one or a plurality of motor-driven pumps (34, 35, 36) having an adjustable capacity that enables the activation of at least two alternately actuated hydrostatic actuators (1, 2) by means of one or a plurality of control valves (21, 22, 23, 24) by means of a liquid pressure generating fluid, such as hydraulic oil or an emulsion, and in which another pressure generating medium, such as water, can be supplied via a separate pipe system to hydrostatic actuators (1, 2), and in which the pressure of another pressure generating medium the pressure is increased by hydrostatic drives (1, 2) to the pressure necessary to drive the corresponding forging machines, such as forging and stamping presses or extrusion presses, and the specified other medium can be supplied to these machines m to actuate them by means of a common system (47) of pipes or channels for a pressure generating medium, while the device further comprises a pre-compression valve (7, 8), which allows the check valve to be bypassed (3, 4) when brought into action for preliminary compression of the chamber (1e, 2e) of the cylinder of each of the actuators (1, 2) with a fluid, in particular, pure water coming from the pipe (12) through the pre-compression valve (7, 8) in this cylinder (1e, 2e) when the other piston (1b, 2b) is ready to extrude fluid