Method and apparatus for correcting thermal displacement of...

Data processing: generic control systems or specific application – Specific application – apparatus or process – Product assembly or manufacturing

Reexamination Certificate

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C700S174000, C700S176000, C700S178000

Reexamination Certificate

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11255649

ABSTRACT:
A method corrects thermal displacement of a machine tool having a rotational spindle. The method includes detecting a rotation speed of the spindle. A thermal displacement amount of the spindle in the current cycle of execution of a program is estimated by using an arithmetic expression that is based at least on the spindle rotation speed and a thermal displacement amount that has been estimated in the preceding cycle of execution of the program. The estimated thermal displacement amount in the current cycle is used as a correction amount for canceling the thermal displacement of the spindle. Therefore, thermal displacement of a machine tool is corrected with no complicated processes when a spindle rotation speed changes.

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“Improving CNC Machining Accuracy Through Thermal Model Based Control” -Michaloski et al, Proceedings of JUSFA'04, 2004 Japan—USA Symposium on Flexible Automation, Jul. 19-21, 2004.
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“A Real Time Thermal Innacuracy Compensation Method on Machining Centre”—Tseng et al, National Chung Hsing University Department of Mechanical Engineering, 1997.
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