Stepwise CoefficientsModifying Modeling of  Thermal Errors of a CNC Machine Tool

Abstract

Abstract: Based on the analysis of insufficiencies and limitations of the linear regression analysis modeling method, a new modeling method, that is, stepwise coefficients-modifying modeling method (SCMM) whose basic theory and compensation strategies are evolved and elaborated on, was proposed. The modeling and compensation tests were carried out on a CNC turning center. The results show that the fitted errors are nearly close to zero at the sampled data based on that the model was derived (called original sampled data here) while a good conformity with the original sampled data is got at the nonoriginal sampled data, which proves the thermal error model can effectively improve the compensation accuracy.

Key words: thermal error, CNC turning center, stepwise coefficientsmodifying modeling method, zero error

CLC Number:

TH161.6

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Stepwise CoefficientsModifying Modeling of Thermal Errors of a CNC Machine Tool

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