Title: The design and development of a real-time compensation controller of thermally-induced errors for CNC machine tools

Authors: Jianmin Hu; Zude Zhou; Quan Liu; Ping Lou; Hu Zhang

Addresses: Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology; School of Information Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, China ' Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology; School of Information Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, China ' Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology; School of Information Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, China ' Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology; School of Information Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, China ' Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology; School of Information Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, China

Abstract: Thermal deformation of the machine tool structure is one of critical factors affecting the machining accuracy level. These thermally-induced errors can account for as much as 70% of the dimensional errors on a machined work piece. Although thermally-induced errors can be reduced by applying the new materials with low-expansion coefficient to machine tools, designing the well symmetrical structure of machine tools, as well as controlling the temperature of the machining process, the costs will rise greatly. Furthermore, thermally-induced errors cannot be eliminated completely at the design stage. Hence if thermally-induced errors can be predicted, the use of indirect compensation systems will emerge as the most economical and inevitable course of action. In this paper, a real-time compensation controller of thermally-induced errors for CNC machine tools is designed and developed with the embedded technology. Test results demonstrate this compensation controller predict and compensate thermally-induced errors of CNC machine tools very well.

Keywords: thermally-induced errors; CNC machine tools; error compensation; embedded system.

DOI: 10.1504/IJMR.2017.083655

International Journal of Manufacturing Research, 2017 Vol.12 No.1, pp.118 - 130

Received: 28 Apr 2016
Accepted: 31 Aug 2016

Published online: 10 Apr 2017 *

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