| 摘要 |
Method and apparatus for diagnosing a cushioning device of a press, wherein an optimum range of a blank-holding force acting on a pressure member through a cushion platen, balancing hydraulic cylinders and cushion pins is determined on the basis of a rate of change of the detected hydraulic pressure in the hydraulic cylinders with a change of the blank-holding force, or on the basis of the detected blank-holding force and hydraulic pressure and according to a predetermined formula formulated on the basis of specifications of the cushioning device. Where the rate of change of the detected hydraulic pressure is used for diagnosing the cushioning device, the optimum range of the blank-holding force is determined if the rate of change of the hydraulic pressure with the blank-holding force is substantially constant, or is substantially equal to a reference value determined on the basis of the specifications of the cushioning device.
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