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CSME 2020/08
Volume 41 No.4
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457-465
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Abbe Positioning Error Modeling and Compensation of CNC Machine Tools Based on Instantaneous Rotation Center
Hong-Tao Yanga, Li Lia, Yong-Jun Panga and Bang-Shen Chena
aSchool of Mechanical Engineering, Anhui University of Science and Technology, Huainan 232001, China.
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Abstract:
In order to reduce the uncertainty of the imprecise Abbe offset calculation to the positioning error compensation of Computerized Numerical Control machine tools, the concept of instantaneous rotation center was proposed in this paper. The precise calculation model of Abbe offset and the compensation model of Abbe positioning error of the Computerized Numerical Control worktable was built based on instantaneous rotation center. An experimental system for determining the instantaneous rotation center was established by using a laser interferometer and speed sensors. The experiments for determining the instantaneous rotation center of the Computerized Numerical Control worktable with different X direction moving speed were carried out. The experimental results show that the instantaneous rotation center positions of the worktable change under different positions and speeds. The positioning error compensation experiments with the new compensation model based on the instantaneous rotation center and the traditional model were carried out, respectively. Under the speeds of 180 mm/min, 240 mm/min and 300 mm/min, the position errors of the Computerized Numerical Control worktable compensated by the instantaneous rotation center method are 0.81 μm , 1.12 μm and 1.18 μm less than errors compensated by using the traditional method respectively, the positioning errors compensation method based on the instantaneous rotation center can achieve a higher Abbe distance calculation accuracy and better Abbe positioning error compensation of the Computerized Numerical Control worktable.
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Keywords: Computerized Numerical Control machine tool, guide rail system, Abbe positioning error, instantaneous rotation center, precise compensation.
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©
2020
CSME , ISSN 0257-9731
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