Die cushion force control method and die cushion device
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United States of America Patent
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Jul 18, 2017
Grant Date -
Jul 2, 2015
app pub date -
Dec 16, 2014
filing date -
Dec 26, 2013
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Abstract
There are provided a die cushion force control method and a die cushion device that can improve response delay of die cushion force without changing die cushion waiting position upward. In the die cushion force control method, a servo motor is driven according to a die cushion force command B previously set and the die cushion force is generated on the cushion pad. The die cushion force control method includes a step of allowing the cushion pad to wait in a predetermined die cushion waiting position at which a die cushion force action will start, and a preliminary pressurization step of outputting the die cushion force command B and preliminary applying pressure to the cushion pad before a slide of a press machine reaches the die cushion waiting position.
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