Monitoring device and monitoring method of main spindle rotating speed in machine tool, and machine tool
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United States of America Patent
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Feb 8, 2022
Grant Date -
May 6, 2021
app pub date -
Oct 2, 2020
filing date -
Oct 30, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
A monitoring device of a main spindle rotation speed in a machine tool displays a variation state of the rotation speed by a rotation speed variation unit using a display unit in the machine tool. The monitoring device includes a variation value setting unit, a drawing unit, a first display unit, and a settable range calculating unit. The settable range calculating unit is configured to calculate a settable range of a variation amplitude and a variation cycle based on a calculation formula. The calculation formula includes the variation cycle, a difference between a first rotation speed and a second rotation speed at mutually different timings among the rotation speeds varied relative to a reference rotation speed, an inertia of a rotating body, a rated output of a motor that drives a main spindle, and a usage proportion to the rated output of the motor.
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