Machine press

A machine press (1) comprising a machine framework (3), a lower tool support (4), an upper tool support (7), which can be moved linearly up and down relative to the lower tool support, by means of a hydraulic drive system, by an operating stroke (H), and a numeric machine control (21), wherein the machine press furthermore has the following characteristics:

• the hydraulic drive system comprises at least two hydraulic drive units (8, 9) that are independent of one another, wherein each of the hydraulic drive units in turn has the following characteristics:
• at least one hydraulic cylinder (12) brings about the linear up and down movement of the upper tool support (7) and is connected, by way of valves (22, 26, 27) and a main pressure line (20) that stands under a supply pressure, with a pump (16) driven by a motor (17), which pump draws hydraulic fluid from a tank (18);
• a speed of rotation of the motor (17) is adjustable by way of the numeric machine control (21), wherein a speed-of-rotation profile defined over a work cycle is stored in a memory of the numeric machine control;
• a pressure-limiting unit limits the level of the supply pressure at least during a part of the work cycle, to a lower pressure of a pressure stored in the memory of the numeric machine control (21), defined over the work cycle, and an actual load pressure at the at least one hydraulic cylinder (12), increased by a margin.