Measurement trajectory evaluation and error compensation for kinematic calibration of a 5-axis hybrid machine tool

LIU Yuzhe; WU Jun; WANG Liping; WANG Jinsong

doi:10.16511/j.cnki.qhdxxb.2016.22.037

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Journal of Tsinghua University(Science and Technology) ›› 2016, Vol. 56 ›› Issue (10) : 1047-1054. DOI: 10.16511/j.cnki.qhdxxb.2016.22.037

Measurement trajectory evaluation and error compensation for kinematic calibration of a 5-axis hybrid machine tool

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Abstract

This paper described the kinematic calibration of the measurement trajectory and error compensation of a 5-axis hybrid machine tool. The kinematics model was based on the closed loop vector kinematic equations while the error model was based on the linear perturbation method. An index to evaluate the measurement trajectory was developed from a non-orthogonal index of the trajectory vectors. Two calibration tests were performed using different trajectories. Two error compensation schemes were based on the forward and inverse kinematics. The calibration tests show that the error compensation scheme based on the inverse kinematics has higher compensation accuracy. Finally, a test of machining an "S"-shape test specimen shows that 94% of the detected points are acceptable. The results verify the effectiveness of the index and the error compensation scheme.

Key words

kinematic calibration / hybrid machine tool / measurement trajectory / error compensation

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LIU Yuzhe, WU Jun, WANG Liping, WANG Jinsong. Measurement trajectory evaluation and error compensation for kinematic calibration of a 5-axis hybrid machine tool[J]. Journal of Tsinghua University(Science and Technology). 2016, 56(10): 1047-1054 https://doi.org/10.16511/j.cnki.qhdxxb.2016.22.037

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