Graphical presentation of error motions of rotary axes on a five-axis machine tool by static R-test with separating the influence of squareness errors of linear axes
- 作者：Cefu Hong ; Soichi Ibaraki ; ibaraki@prec.kyoto-u.ac.jp ; Chiaki Oyama
- 关键词：Five-axis machine tool ; R-test ; Calibration ; Error motion ; Squareness error
- 刊名：International Journal of Machine Tools and Manufacture
- 出版年：2012
- 期刊代码：84_08906955
- 类别：et
- 出版时间：August, 2012
- 卷：59
- 期：Complete
- 页码：24-33
- 文件大小：1748 K
摘要
This paper presents an efficient and automated scheme to observe error motions of rotary axes on a five-axis machine tool by using the R-test. During a five-axis measurement cycle, the R-test sensors nest measures the three-dimensional displacement of a sphere attached to the spindle in the coordinate system attached on the rotary table. This paper first demonstrates an intuitive, graphical presentation method of R-test measurements to understand how error motions of rotary table change in three-dimensional space depending on the swiveling angle. A critical issue with the error calibration by the R-test is that error motions of linear axes must be sufficiently small as a prerequisite to calibrate component errors of rotary axes. To partially address this issue, this paper proposes a scheme to separate squareness errors of linear axes by performing a set of R-test measurement cycles with different sphere positions.