Die cushion device of pressing machine
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United States of America Patent
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Mar 6, 2012
Grant Date -
Jun 25, 2009
app pub date -
Nov 14, 2005
filing date -
Nov 16, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
In a die-cushion device of a press machine a controller controls an opening degree of a proportional flow-rate control valve to an appropriate opening degree in order to control the flow rate flowing out of a lower chamber of a hydraulic cylinder supporting a cushion pad before a slide collides against the cushion pad using a die-cushion pressure command commanded from a commander in advance and a slide speed signal inputted from a slide speed detector. By this, generation of a surge pressure when a slide collides against the cushion pad at a high speed is restricted.
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