Measurement and verification of position-independent geometric errors of a five-axis machine tool using a double ball-bar |
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| Affiliation: | 1. College of Engineering, Nanjing Agricultural University, Nanjing 210031, China;2. Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK;1. The State Key Lab of Fluid Power Transmission and Control, Department of Mechanical Engineering, Zhejiang University, Room 123, Teaching building No.1, Yuquan Campus, Hangzhou 310027, China;2. School of Mechanical and Manufacturing Engineering, The University of New South Wales, NSW 2052, Australia;1. Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin 300072, China;2. School of Engineering, The University of Warwick, Coventry CV4 7AL, UK;1. School of Mechanical and Power Engineering, Nanjing TECH University, Nanjing, Jiangsu 211816, PR China;2. Nanjing Gongda CNC Technology Co., Ltd., Nanjing, Jiangsu 211899, PR China;3. College of Engineering, University of Illinois at Chicago, Chicago, IL 60607, United States |
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| Abstract: | In this study, position-independent geometric errors, including offset errors and squareness errors of rotary axes of a five-axis machine tool are measured using a double ball-bar and are verified through compensation. In addition, standard uncertainties of measurement results are calculated to establish their confidence intervals. This requires two measurement paths for each rotary axis, which are involving control of single rotary axis during measurement. So, the measurement paths simplify the measurement process, and reduce measurement cost including less operator effort and measurement time. Set-up errors, which are inevitable during the installation of the balls, are modeled as constants. Their effects on the measurement results are investigated to improve the accuracy of the measurement result. A novel fixture consisting of flexure hinges and two pairs of bolts is used to minimize set-up error by adjusting the ball's position located at the tool nose. Simulation is performed to check the validation of measurement and to analyze the standard uncertainties of the measurement results. Finally, the position-independent geometric errors of the five-axis machine tool (involving a rotary axis and a trunnion axis) are measured using proposed method. |
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| Keywords: | Position-independent geometric errors Rotary axis Five-axis machine tool Uncertainty analysis Double ball-bar |
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