Novel method for identifying sensitive geometric errors of CNC machine tools oriented to cylindricity in flank milling

• Published in: Journal of manufacturing processes 2024-09, Vol.126, p.370-381
• Main Authors: Chen, Guangchun, Ding, Shuang, Xu, Guicai
• Format: Article
• Language: English
• Subjects: Cylindricity; Geometric errors; Sensitivity error analysis
• ISSN: 1526-6125
• DOI: 10.1016/j.jmapro.2024.07.087

Parts machining accuracy is greatly affected by the machine tool geometric errors. According to geometrical product specification (GPS), the evaluation criteria for part accuracy depend on the part features. The existing spatial pose sensitivity analysis methods for geometric errors are not related to part features. There is a lack of sensitive error analysis methods oriented to the feature quality of shape-position. Therefore, a novel method for identifying sensitive geometric errors of CNC machine tools, oriented to cylindricity in multi-axis flank milling, is proposed for cylindrical feature parts. Firstly, a mapping model has been established relating cylindricity to geometric errors through the Homogeneous Transformation Matrix (HTM) and Multi-Body System Theory (MBS). Secondly, sensitive geometric errors affecting cylindricity were identified using the global Morris method. Then, the numerical simulation demonstrates the superiority of the proposed method over the conventional spatial pose sensitivity analysis. Finally, the cutting experiment was carried out using NC programs modified with actual inverse kinematics. The results indicate that the compensation of the identification method oriented to cylindricity is more favourable compared to existing methods. This approach is more conducive to improving the accuracy performance of cylindrical parts.