Geometric error measurement and compensation for the rotary table of five-axis machine tool with double ballbar

This paper proposes a novel measuring method for geometric error identification of the rotary table on five-axis machine tools by using double ballbar (DBB) as the measuring instrument. This measuring method greatly simplifies the measurement setup, for only a DBB system and a height-adjustable fixture are needed to evaluate simultaneously five errors including one axial error, two radial errors, and two tilt errors caused by the rotary table. Two DBB-measuring paths are designed in different horizontal planes so as to decouple the linear and angular errors. The theoretical measuring patterns caused by different errors are simulated on the basis of the error model. Finally, the proposed method is applied to a vertical five-axis machining center for error measurement and compensation. The experimental results show that this measuring method is quite convenient and effective to identify geometric errors caused by the rotary table on five-axis machine tools.

[1]  J.-M. Lai,et al.  Modeling and analysis of nonlinear guideway for double-ball bar (DBB) measurement and diagnosis , 1997 .

[2]  Soichi Ibaraki,et al.  Influence of position-dependent geometric errors of rotary axes on a machining test of cone frustum by five-axis machine tools , 2011 .

[3]  W. T. Lei,et al.  Accuracy test of five-axis CNC machine tool with 3D probe-ball. Part I: Design and modeling , 2002 .

[4]  Wuyi Chen,et al.  A methodology for error characterization and quantification in rotary joints of multi-axis machine tools , 2010 .

[5]  J. B. Bryan,et al.  A simple method for testing measuring machines and machine tools Part 1: Principles and applications , 1982 .

[6]  J. B. Bryan,et al.  A simple method for testing measuring machines and machine tools. Part 2: Construction details , 1982 .

[7]  S. Weikert,et al.  R-Test, a New Device for Accuracy Measurements on Five Axis Machine Tools , 2004 .

[8]  Dong-Mok Lee,et al.  Identification and measurement of geometric errors for a five-axis machine tool with a tilting head using a double ball-bar , 2011 .

[9]  Robert Schmitt,et al.  Geometric error measurement and compensation of machines : an update , 2008 .

[10]  J.R.R. Mayer,et al.  Assessment of machine tool trunnion axis motion error, using magnetic double ball bar , 2006 .

[11]  W. T. Lei,et al.  Accuracy test of five-axis CNC machine tool with 3D probe-ball. Part II: errors estimation , 2002 .

[12]  Masaomi Tsutsumi,et al.  Simultaneous Five-axis Motion for Identifying Geometric Deviations Through Simulation in Machining Centers with a Double Pivot Head , 2008 .

[13]  W. T. Lei,et al.  Double ballbar test for the rotary axes of five-axis CNC machine tools , 2007 .

[14]  Wen-Yuh Jywe.  The Development and Application of a Planar Encoder Measuring System for Performance Tests of CNC Machine Tools , 2003 .

[15]  Soichi Ibaraki,et al.  Prediction and compensation of machining geometric errors of five-axis machining centers with kinematic errors , 2009 .

[16]  Y. Y. Hsu,et al.  A new compensation method for geometry errors of five-axis machine tools , 2007 .

[17]  Masaomi Tsutsumi,et al.  Identification of angular and positional deviations inherent to 5-axis machining centers with a tilting-rotary table by simultaneous four-axis control movements , 2004 .