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International Journal of Machine Tools and Manufacture, Volume 89, February 2015, Pages 142–150.
Gaoyan Zhong1, Chaoqun Wang1, Shoufeng Yang2, Enlai Zheng1, Yanyan Ge1
- College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
- Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK
Abstract
This paper presents a position geometric error modeling, identification and compensation method for large 5-axis machining center prototype. First, regarding the prototype as a rigid multi-body system, a geometric error model has been established, which supports the identification of position geometric error associated with a translational axis by using laser interferometer, and a rotational axis by using laser tracker. Second, based on this model, an improved identification approach named as virtual rigid-body is put forward for calculating positioning error of each large translational axis. Detailed derivation of a generalized matrix equation is given. Third, analytical models based on the least-squares theory were adopted to compute error values at an arbitrary position for error compensation. Finally, the identified position geometric errors were compensated by using recursive software-based error compensation method. The results show that the position accuracy of large machining center prototype has been improved with compensation and up to the design requirements.
