Abstract: An apparatus and method for controlling a stroke of a cylinder-type press machine in which a forming process control pattern comprises a pressurizing interval in which a ram of the press is maintained at its bottom position at a constant pressure for a fixed time. Accordingly, warp and distortion of a workpiece due to a spring-back of the workpiece is suppressed. Another feature of the present invention is that either the punching or forming process can be accomplished by selecting a specified pattern for various types of control patterns stored in a punching process control pattern storage section and a forming process control pattern storage section.

Abstract: A method and device, for controlling a press machine, which creates an appropriate control pattern whereby high efficient processing is performed having low vibration and low noise and with operating efficiencies increased. This is accomplished based on the knowledge that the amount of vibration and noise are principles determined by the punching pressure. An appropriate punching velocity is selected from a table in accordance with a maximum punching pressure detected in a test punching operation, and then an appropriate control pattern of the stroke of a ram is created on the basis of the data detected in the test punching operation and the selected punching velocity.