MONITORING DEVICE AND MONITORING METHOD OF MAIN SPINDLE ROTATION SPEED IN MACHINE TOOL, AND MACHINE TOOL
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United States of America
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Issued Date -
May 6, 2021
app pub date -
Oct 2, 2020
filing date -
Oct 2, 2020
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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 drawing unit, a variation position display unit, and a reduction effect index display unit. The drawing unit is configured to display a variation diagram that illustrates a relationship between a variation amplitude and a variation cycle of the rotation speed. The reduction effect index display unit is configured to display a reduction effect index on the variation diagram. The reduction effect index represents a reduction effect of chatter vibration. The reduction effect index is calculated based on a speed ratio that is a ratio of a rotation speed of one rotation before to a rotation speed at an identical rotation position of the main spindle at any given timing.
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