| Mechanical Engineering |
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X-axis thermal error modeling and compensation for an NL201HA CNC horizontal lathe |
Yong LUO1,2,Zhufeng SHAO1,*( ),Liping WANG1,2,Jiahao QIU1,Zhejin SHENG1 |
1. Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipments and Control, State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
2. Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China |
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Abstract The influence of thermal error on machine tool processing accuracy was analyzed for a computer numerical control (CNC) horizontal lathe. Thermal error data was recorded using an infrared thermal imager, a displacement sensor and a temperature sensor to establish a thermal error model and a thermal error compensation system. Infrared thermal images and correlation analyses were used to optimize the locations of key temperature measurement points. Then, a linear regression thermal error model was developed for the main lathe axis in the radial direction (X direction). Tests show that the linear regression model is robust and suitable for thermal error modelling of the lathe. The linear regression model was then used to develop a thermal error compensation system based on a Siemens 828D CNC system and an S7-300PLC (programmable logic controller). Tests show that the radial thermal error of the shaft is reduced from the original 10 μm to less than 5 μm with the accuracy improved by more than 50%.
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| Keywords
computer numerical control (CNC) horizontal lathe
temperature measuring point
thermal error modeling
thermal error compensation
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Corresponding Authors:
Zhufeng SHAO
E-mail: shaozf@tsinghua.edu.cn
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Issue Date: 26 November 2020
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2021,
Vol. 61
