| 摘要 |
The press has a ram (1) and a ring (2) for the deep drawing of sheet metal workpieces. It has a hydraulically actuated device (3) by a hydraulic cylinder pressing on teh holders ring (3) for holding downthe sheet metal blank. The force exerted on the blank is initially low. A sensing device senses when any puckering of the sheet metal occurs and actuates the hydraulic pressure control system (6-14) so that the pressure is increased. The holding down force exerted by the hydraulic cylinder (11) is then held at this level until puckering recurs. The holdind down force is then further increased to eliminate puckering. This process of stepwise increases in the holding down force, is repeated until the deep drawing operation is completed. USE - Deep drawing of sheet metal workpieces.
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