Kinematic error separation on five-axis NC machine tool based on telescoping double ball bar

Abstract

The theory and algorithm of the homogeneous transformation matrix (HTM) method are applied in establishing the kinematic error model of five-axis machining tool with two-axis turntable. Based on this model, a new method for the kinematic error separation in five-axis numerical control (NC) machining tool is proposed. In this study, three types of simultaneous three-axis control motions are designed for each rotary axis to identify the deviations. In the measurement, two translational axes and one rotary axis are simultaneously controlled to keep a constant distance between the tool and the worktable. Telescoping double ball bar is used to measure the relative distance between the spindle and the worktable in the motion of NC machining tool. Finally, the value measured by telescoping double ball bar is substituted into the model to obtain kinematic error of NC machining tool. Comparison has confirmed that the proposed method is high precision and can be applied to effectively and conveniently measure the five-axis machining tool.

Keywords

error modeling / error separation / telescoping double ball bar / five-axis numerical control (NC) machining tool

References

[1] Bohez E L J. Five-axis milling machine tool kinematic chain design and analysis. International Journal of Machine Tools & Manufacture, 2002, 42(4): 505-520

[2] Kakino Y, Ihara Y, Kamei A, Ise T. Study on the motion accuracy of NC machine tools (1st report): the measurement and evaluation of motion errors by double ball bar test. Journal of the Japan Society of Precision Engineering, 1986, 52(7): 1193-1198 (in Japanese)

[3] Lai J M, Liao J S, Chieng W H. Modeling and analysis of nonlinear guideway for double-ball bar (DBB) measurement and diagnosis. International Journal of Machine Tools & Manufacture, 1997, 37(5): 687-707

[4] Takeda Y, Shen G, Funabashi H. A DBB-based kinematic calibration method for in-parallel actuated mechanisms using a Fourier series. Journal of Mechanical Design, 2004, 126(5): 856-865

[5] Florussen G H J, Delbressine F L M, Schellekens P H J. Assessing thermally induced errors of machine tools by 3D length measurements. CIRP Annals-Manufacturing Technology, 2003, 52(1): 333-336

[6] Inasaki I, Kishinami K, Sakamoto S. Shaper Generation Theory of Machine Tools - Its Basis and Applications. Tokyo: Yokendo, 1997, 95-103 (in Japanese)

[7] ISO 230–1. Test Code for Machine Tools (Part 1): Geometric Accuracy of Machines Operating under No-load or Finishing Conditions. 1996,1-62

[8] Tsutsumi M, Saito A. Identification and compensation of systematic deviations particular to 5-axis machining centers. International Journal of Machine Tools & Manufacture, 2003, 43(8): 771-780

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Higher Education Press and Springer-Verlag Berlin Heidelberg