Title:
THERMAL DISPLACEMENT ESTIMATING METHOD FOR MACHINE TOOL
Document Type and Number:
Japanese Patent JP3805932
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To estimate thermal displacement with high accuracy even in the case of representing a characteristic out of a primary delay system by a temperature change and a displacement amount change.
SOLUTION: A temperature in each part of a machine tool is measured and numerically valued. When a rotational speed is changed, after calculation of a step difference amount, a counter is started, a truncation coefficient S which is a threshold value changing an estimation characteristic in a transient condition is calculated. After execution of step difference absorbing treatment, an optimum coefficient F is calculated, the optimum coefficient F is compared with the truncation coefficient S, in the case of obtaining a relation F<S, the optimum coefficient F is set to a value equal to the truncation coefficient S. Thereafter, an estimating intermediate value is calculated, a thermal displacement amount is arithmetically estimated, and an NC device executes a correction process by a correction amount corresponding to the estimated thermal displacement amount.
Inventors:
Senda Harumitsu
Application Number:
JP24627899A
Publication Date:
August 09, 2006
Filing Date:
August 31, 1999
Export Citation:
Assignee:
Okuma Corporation
International Classes:
B23Q15/18; G05B19/404; B23Q1/00; B23Q1/72; B23Q17/00; (IPC1-7): B23Q15/18; B23Q1/00; B23Q17/00; //G05B19/404
Domestic Patent References:
| JP68107A | ||||
| JP3120597A |
Attorney, Agent or Firm:
Yoshiki Ishida
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