Multiple stage press used as a crossover press comprises a hydraulic closing device having matrix halves moving relative to each other and a stamp moving relative to the closed halves, and hydraulic plungers

摘要

Multiple stage press comprises a hydraulic closing device (S1, S2) having matrix halves (22, 42) moving relative to each other and a stamp (20, 40) moving relative to the closed halves, a first hydraulic plunger (16) arranged on the first matrix half in a first hydraulic cylinder (6), and a second hydraulic plunger (36) in a second hydraulic cylinder (26). The second plunger is bombarded by a pressure from the first hydraulic plunger by pressing the workpiece. Preferred Features: Both hydraulic plungers have identical surfaces guaranteeing identical lifting speeds. The first hydraulic cylinder is arranged on a pressing ram (24). The second matrix half is arranged on the second hydraulic cylinder.