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

doi:10.1007/s11465-010-0110-1

Front Mech Eng Chin

2010, Vol. 5

Issue (4) : 431-437 https://doi.org/10.1007/s11465-010-0110-1

RESEARCH ARTICLE

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

Min WANG(

), Jianzhong HU, Tao ZAN

School of Mechanical Engineering, Beijing University of Technology, Beijing 100024, China

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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

Corresponding Author(s): WANG Min,Email:wangm@bjut.edu.cn

Issue Date: 05 December 2010

Cite this article:

Tao ZAN,Jianzhong HU,Min WANG. Kinematic error separation on five-axis NC machine tool based on telescoping double ball bar[J]. Front Mech Eng Chin, 2010, 5(4): 431-437.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-010-0110-1
https://academic.hep.com.cn/fme/EN/Y2010/V5/I4/431

Fig.1 Configuration of employed five-axis NC machine tool

Fig.2 axis rotates with radial direction of ball bar

Fig.3 axis rotates with axial direction of ball bar

Fig.4 axis rotates with tangential direction of ball bar

Fig.5 axis rotates with axial direction of ball bar

Fig.6 axis rotates with tangential direction of ball bar

Fig.7 axis rotates with radial direction of ball bar

Tab.1 Actual lengths of ball bar which need to be read at special locations and poses

Tab.2 Identified results of kinematical errors

Tab.3 Identified results of kinematical errors using the former method

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