Press machine and method of controlling press machine
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United States of America Patent
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Dec 11, 2018
Grant Date -
Dec 10, 2015
app pub date -
Feb 4, 2014
filing date -
Feb 12, 2013
priority date (Note) -
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Abstract
A press machine includes a servo amplifier configured to supply a drive current to a servo motor, a current detector for detecting the drive current, a rotational angle detector for detecting a rotational angle of a rotary motion provided by the servo motor, and a controller. The controller is configured to set a press production speed by setting a correspondence between rotational angles and rotational speeds at the rotational angles, which defines the rotary motion. The controller is configured to determine whether or not the drive current detected by the current detector is greater than or equal to a first threshold. The controller is configured to reduce all the rotational speeds by an equal ratio when the drive current detected by the current detector is greater than or equal to the first threshold.
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