Effect analysis of dynamic characteristics of a parallel machine tool on machining accuracy

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (16) : 198-204.

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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

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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.

Key words

parallel machine tool / drive force of a leg / length error of a leg / position error and pose error of a moving platform / error of machining position

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XU Zhao-tang;;LIU Yuan-wei;WANG Tong-yue;WU Hai-bing. Effect analysis of dynamic characteristics of a parallel machine tool on machining accuracy[J]. Journal of Vibration and Shock, 2013, 32(16): 198-204