上海交通大学学报(自然版) ›› 2014, Vol. 48 ›› Issue (1): 27-32.

• 机械仪表工程 • 上一篇    下一篇

基于自适应分段与动态修正的机床定位误差补偿

李自汉,杨建国,张毅,姚晓栋
  

  1. (上海交通大学 机械与动力工程学院, 上海 200240)
     
  • 收稿日期:2013-01-28
  • 基金资助:

    国家科技重大专项项目(2011ZX04015031),教育部高等学校博士学科点专项基金项目(20110073110041),国家自然科学基金项目(51175343)资助

Machine Tool Positioning Error Compensation Based on Adaptive Segmentation and Dynamic Modification
 

LI Zihan,YANG Jianguo,ZHANG Yi,YAO Xiaodong
  

  1. (School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
     
  • Received:2013-01-28

摘要:

为了提高并保持机床的加工精度,提出了自适应分段建模与动态修正相结合的误差补偿方法.根据误差曲线形状与建模精度需求,自适应地确定分段区间与函数最佳拟合阶次,以实现在线自动建模.结果表明,所建模型并非一个固定的算法,能够实时监测机床温度场、外界环境温度及冷却液工作状态的变化情况,不断更新数学补偿模型的几何调整因子与热增益系数,并动态修正补偿模型.同时,在VM850型立式加工中心进行了误差补偿实验.结果表明,在复杂工况下,基于自适应分段建模与动态修正相结合的误差建模及补偿方法能够满足数控机床的实时补偿需求,其补偿精度高、鲁棒性好.

关键词: 机床, 定位误差, 自适应建模, 动态修正, 实时补偿

Abstract:

To improve and maintain the machining accuracy of machine tools, this paper proposed a novel compensation method based on adaptive segmentation modeling and dynamic modification. This algorithm can figure out the exact segmentation intervals and the best-fitting polynomial automatically according to the positioning error curve shape and the modeling accuracy requirement. In addition, the compensation model is not a fixed algorithm. It can monitor the real-time temperature field of machine tools, the ambient temperature variation, as well as the working conditions of coolant, and adjust the coefficients for the compensation model. Compensation experiments on the machining center VM850 showed that the compensation method could meet the requirement of realtime error compensation under complex working conditions, with its excellent modeling accuracy and robustness.
 

Key words: machine tool, positioning error, adaptive modeling, dynamic modification, realtime compensation

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