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| Effect analysis of dynamic characteristics of a parallel machine tool on machining accuracy |
| XU Zhao-tang1, 2, LIU Yuan-wei1, WANG Tong-yue1, WU Hai-bing1 |
| 1. Key Laboratory of Digital Manufacturing Technology, Huaiyin Institute of Technology, Huaian, Jiangsu, 223003；2. Department of Traffic Engineering, Huaiyin Institute of Technology, Huaian, Jiangsu, 223003 |
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Abstract In order to improve machining accuracy of a parallel machine tool, effect of dynamic characteristics of a parallel machine tool on machining accuracy is analysed. Dynamic equation of a parallel machine tool can be obtained by Newton-Euler approach. Drive force of a leg is solved from the dynamic equation. According to relation between axial extension length and drive force of a leg, length error of a leg is calculated. With a leg length of length error-free used as optimization objective, position and pose of a moving platform are got by optimization method. Position error and pose error of a moving platform is obtained by a comparison between the position and pose with length error of a leg and the one without length error of a leg. According to position of a tool in a coordinate system of a moving platform, error of machining position is calculated, effect on accuracy of machined parts is obtained. The result shows that error of machining position of a tool is caused by length error of a leg in a parallel machine tool, which produces form and position and dimension error in a machined part. Disturbed error of machining position of a tool is caused by disturbance of length error of a leg from rotor eccentricity of a parallel machine tool, which effects surface roughness of a machined part.
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Received: 08 February 2012
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2013, Vol. 32 
