Research on the Mechanism of Free Surface Contour Error Caused by the Stiffness of Feed System of Five-axis Machine Tools

doi:10.3901/JME.2016.21.146

Abstract

Abstract: The complex structures of feed system are the main components of five-axis CNC machine tool. Particularly during the processing, the dynamic stiffness of feed system change with the motions of each axis, which present the performance limit of cutting free-form surface. The model of the elastic deformation of the feed system on an A/C machine tool is established. Based on a new free surface specimen, the contouring errors caused by deformation are analyzed. The motions of five axes are simulated by a cross constraint control strategy then the contouring errors on different curvature of the specimen are obtained. The mechanism of elastic deformation of feed rate on courting errors is explained and verified by the cutting experiments. Presenting, measuring and evaluation these limits are easy for the user to understand the challenging of elastic deformation of the machine tool. It also provide a new way to evaluating the performance of machine tool by S part specimen.

Key words: contouring error, dynamic stiffness, elastic deformation, freeform surface, five-axis machine tools

WANG Wei, ZHANG Xinyu, MEI Xiong. Research on the Mechanism of Free Surface Contour Error Caused by the Stiffness of Feed System of Five-axis Machine Tools[J]. Journal of Mechanical Engineering, 2016, 52(21): 155-165.

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Research on the Mechanism of Free Surface Contour Error Caused by the Stiffness of Feed System of Five-axis Machine Tools

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