Method and device for controlling the stroke of a press machine
AssigneeAmada Company, Limited
InventorKinshirou Naito
Life of this patent
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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.
Claims4
A method for controlling the stroke of a cylinder type press machine in which the velocity of the stroke of a ram can be variably controlled, comprising the steps of:
- (a) preparing a plurality of processing patterns for the velocity of the stroke of the ram said plurality of processing patterns comprising punching process control patterns and forming process control patterns;
- (b) selecting a processing pattern from said plurality of processing patterns prepared in step (a);
- and
- (c) controlling the ram according to the selected processing pattern,
- wherein the forming process control patter comprises a forming interval in which the ram is lowered to form a workpiece by applying pressure, and a pressurizing interval in which the ram is maintained in its bottom position at a constant pressure for a fixed time.
A device for controlling the stroke of a press machine comprising:
- a servo valve for controlling a hydraulic cylinder which in turn controls the vertical motion of a ram;
- a servo valve control section which controls the servo valve;
- a memory section which comrises a punching process control pattern storage section, which stores various types of control patterns for a punching process, which stores various types of control patterns for a forming process;
- and
- a control pattern setting section which selects a specified control pattern from various types of control patterns stored in said memory section and transmits data on the specified control pattern to said servo valve control section,
- wherein the forming process control pattern comprises a forming interval in which the ram is lowered to form a workpiece by applying pressure, and a pressurizing interval in which the ram is maintained in its bottom position at a constant pressure for a fixed time.
Dependencies are inferred from the claim text.