| 摘要 |
A control apparatus and method for progressively fracturing a work piece from a material sheet in a mechanical press in which the separation distance between an upper die and a lower die is varied in discrete steps as an upper platen advances the upper die toward the lower die, each discrete step occurring within the thickness of the material being stamped. Varying the separation distance includes a motion opposite to the relative direction movement of the upper platen at one or more predetermined distances to create a controlled release of stored forces in the dies and press frame. A distance measuring transducer generates an output indicative of the position of the upper die in relation to the lower die. A controller, in response to a stored control program and the output of the distance measuring transducer, controls the operation of fluid valves to supply pressurized fluid to one or more cylinders coupled between one platen and one die to create the relative separation motion between the upper die and the lower die. The controller also controls a pressure regulating valve to supply fluid at a plurality of discrete pressures to the cylinder or cylinders throughout the operation of the press. The controller alternately controls slidable wedges disposed between a plate fixed to one platen and a movable plate fixed to one die to perform the relative separation motion.
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