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ABSTRACT
To promote higher-quality machining, this paper presents a software-based method for compensating for volumetric errors. The developed software compensation method modifies CNC part programs by applying previously obtained volumetric error tables to modify the axial motion commands. Furthermore, iterative learning control is employed to repetitively and precisely calculate these modified motion commands and further reduce any newly generated volumetric errors that deviate from the machining contours described by the CNC part programs. Several experiments and simulations were performed on a commercial CNC milling machine to validate the approach developed in this study. The results of the experiments indicate that volumetric errors are significantly reduced by applying the developed software compensation method. The rate of reduction was 77.99% for a tested circular contour and 87.59% for a tested spiral contour; therefore, the feasibility of the developed software compensation method was successfully validated for volumetric error compensation for CNC machines.
GRAPHICAL ABSTRACT
ACKNOLEDGEMENTS
This project is supported in part by the National Science Council of the Republic of China under Contract NSC 102-2221-E-027-023 and the Industrial Technology Research Institute, ROC, under project number 9353C72000, which is subcontracted from the Ministry of Economic Affairs, ROC. The authors would like to thank Dr. Hakiem Hsu (3DFamily Technology Co., Ltd.) for making valuable comments.