Accuracy of an electric spindle

WANG Liping; ZHAO Qinzhi; ZHANG Binbin

doi:10.16511/j.cnki.qhdxxb.2018.26.035

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Journal of Tsinghua University(Science and Technology) ›› 2018, Vol. 58 ›› Issue (8) : 746-751. DOI: 10.16511/j.cnki.qhdxxb.2018.26.035

MECHANICAL ENGINEERING

Accuracy of an electric spindle

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Abstract

An electric spindle, as the core of a CNC machine center, directly affects the accuracy of the CNC machining center. This paper describes a method to evaluate electric spindle accuracy by analyzing the spindle radial, tilt and axial motion errors. A radial error model of the electric spindle is then developed from the least squares circle. A rapid evaluation method of the radial accuracy uses a least squares circle approximation algorithm. The radial error is then used to calculate the tilt error and the tilt angle of the spindle rotation axis. Time and frequency domain signal analyses are used to extract the eigenvalues of the axial error to evaluate the axial positioning accuracy of the spindle. This comprehensive accuracy analysis method was applied to a high-speed electric spindle with the results showing that with as the rotational speed increased, the radial error increased while the tilt error and the axial error remained constant. This accuracy analysis method can be applied to analyzed the performance and accuracy degradation of spindles.

Key words

spindle / radial error motion / tilt error motion / axial error motion / least squares circle

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WANG Liping, ZHAO Qinzhi, ZHANG Binbin. Accuracy of an electric spindle[J]. Journal of Tsinghua University(Science and Technology). 2018, 58(8): 746-751 https://doi.org/10.16511/j.cnki.qhdxxb.2018.26.035

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