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A new high-efficiency error compensation system for CNC multi-axis machine tools

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Abstract

To enhance the accuracy of CNC machines for the request of modern industry, an effective static/quasi-static error compensation system composed of an element-free interpolation algorithm based on the Galerkin method for error prediction, a recursive software compensation procedure, and an NC-code converting software, is developed. Through automatically analyzing the machining path, the new error prediction method takes into consideration the fact that the machine structure is non-rigid, and can efficiently determine the position errors of the cutter for compensation without computing a complex error model on-line. The predicted errors are then compensated based on a recursive compensation algorithm. Finally, a compensated NC program will be automatically generated by the NC-code converting software for the precision machining process. Because of the advantage of the element-free theory, the error prediction method can flexibly and irregularly distribute nodal points for accurate error prediction for a machine with complex error distribution characteristics throughout the workspace. To verify the algorithm and the developed system, cutting experiments were conducted in this study, and the results have shown the success of the proposed error compensation system.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Chung Yuan University, Chung-Li, 32023, Taiwan

    Shih-Ming Wang, Han-Jen Yu & Hung-Wei Liao

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  1. Shih-Ming Wang
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  2. Han-Jen Yu
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  3. Hung-Wei Liao
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Correspondence to Shih-Ming Wang.

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Wang, SM., Yu, HJ. & Liao, HW. A new high-efficiency error compensation system for CNC multi-axis machine tools. Int J Adv Manuf Technol 28, 518–526 (2006). https://doi.org/10.1007/s00170-004-2389-8

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  • DOI: https://doi.org/10.1007/s00170-004-2389-8

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