基于对角线测量的机床空间定位误差热变化分析  

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

作　　者：沈金华[1] 杨建国[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《华南理工大学学报（自然科学版）》2008年第10期125-128,139,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：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)

摘　　要：为了研究数控机床温度变化对机床空间定位精度的影响,提出了一种通过分步测量机床工作空间4条体对角线以快速获得机床空间定位误差的方法.基于这种方法,在不同的温度条件下测量了6组数控机床的空间定位误差,并以z轴定位误差为例进行了分析.在某一机床温度条件下,对空间定位误差进行了预测和补偿,z轴定位误差最大从15μm降低到5μm以内,精度得到了改善.结果证明,分步体对角线测量是一种研究机床空间定位误差与机床温度变化之间对应关系并加以补偿的有效手段.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.

关 键 词：数控机床 空间定位误差 对角线测量 温度变化 

分 类 号：TH161[机械工程—机械制造及自动化]