Contouring error modeling and simulation of a four-axis motion control system

A layered modeling method is proposed to resolve the problems resulting from the complexity of the error model of a multi-axis motion control system. In this model, a low level layer can be used as a virtual axis by the high level layer. The first advantage of this model is that the complex error model of a four-axis motion control system can be divided into several simple layers and each layer has different coupling strength to match the real control system. The second advantage lies in the fact that the controller in each layer can be designed specifically for a certain purpose. In this research, a three-layered cross coupling scheme in a four-axis motion control system is proposed to compensate the contouring error of the motion control system. Simulation results show that the maximum contouring error is reduced from 0.208 mm to 0.022 mm and the integration of absolute error is reduced from 0.108 mm to 0.015 mm, which are respectively better than 0.027 mm and 0.037 mm by the traditional method. And in the bottom layer the proposed method also has remarkable ability to achieve high contouring accuracy.

[1]  D. Sun,et al.  A Synchronization Approach for the Minimization of Contouring Errors of CNC Machine Tools , 2009, IEEE Transactions on Automation Science and Engineering.

[2]  Bin Hongzan,et al.  Study on symmetrical machining technology , 2008 .

[3]  Pau-Lo Hsu,et al.  Estimation of the contouring error vector for the cross-coupled control design , 2002 .

[4]  Chao-Chung Peng,et al.  Biaxial contouring control with friction dynamics using a contour index approach , 2007 .

[5]  Lin Li,et al.  Kinematical system of breadth cam profile design , 2011 .

[6]  Chih-Ching Lo,et al.  A tool-path control scheme for five-axis machine tools , 2002 .

[7]  Ruxu Du,et al.  A CNC program module based on polar coordinate system , 2013, The International Journal of Advanced Manufacturing Technology.

[8]  F.J. Perez-Pinal,et al.  Relative coupling strategy , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[9]  Naoki Uchiyama,et al.  Robust contouring control for biaxial feed drive systems , 2008 .

[10]  Rida T. Farouki,et al.  Performance analysis of cross-coupled controllers for CNC machines based upon precise real-time contour error measurement , 2012 .

[11]  Yoram Koren,et al.  Cross-Coupled Biaxial Computer Control for Manufacturing Systems , 1980 .

[12]  Li Zhuang,et al.  Integrated geometric error modeling, identification and compensation of CNC machine tools , 2012 .

[13]  Ming-Yang Cheng,et al.  Motion Controller Design for Contour-Following Tasks Based on Real-Time Contour Error Estimation , 2007, IEEE Transactions on Industrial Electronics.

[14]  Zexiang Li,et al.  A Novel Contour Error Estimation for Position Loop-Based Cross-Coupled Control , 2011, IEEE/ASME Transactions on Mechatronics.