Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (10): 125-128,139.

• Mechanical Engineering • Previous Articles     Next Articles

Thermal Variation Analysis of Spatial Positioning Error of Machine Tool Based on Diagonal Measurement

Shen Jin-hua  Yang Jian-guo   

  1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China
  • Received:2007-11-05 Revised:2008-04-01 Online:2008-10-25 Published:2008-10-25
  • Contact: 沈金华（1981-），男，博士生，主要从事精密测量与加工研究． E-mail:hoticey@sjtu．edu．cn
  • About author:沈金华（1981-），男，博士生，主要从事精密测量与加工研究．
  • Supported by:

    高等学校全国优秀博士学位论文作者专项资金资助项目（200131）;上海市引进技术的吸收与创新年度计划项目（05-12）

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Abstract:

In order to reveal the effect of temperature variation on the spatial positioning precision of NC machine tool, a sequential step measurement along the 4 body diagonals of the working space is proposed for the quick measurement of the spatial positioning error. Then, 6 sets of error data under different temperature conditions are measured based on the proposed method, and the z-axis positoning errors are analyzed as examples. Moreover, the z-axis positioning error at a certain temperature is predicted and compensated, which decreases from 15μm to less than 5 μm. Thus, the precision of the machine tool is successfully improved. It is concluded that the proposed sequential step measurement based on the body diagonal helps to reveal the relationship betweem the spatial positioning error and the temperature variation and to compensate the positioning error effectively.

Key words: NC machine tool, spatial positioning error, diagonal measurement, temperature variation