数控机床热误差建模补偿与在机测量技术研究综述

Review of research on thermal error modelling and compensation and on-machine measurement technology of CNC machine tools

  • 摘要: 装备制造业是立国之本与强国之基,高端数控机床作为其“工业母机”,在动态环境下的精度保障能力直接关系到国家重大战略装备的核心竞争力。在各类误差源中,热误差因其强非线性与时延特性,已成为制约精密加工精度的主要瓶颈,而在机测量(on-machine measurement, OMM)作为实现“加工-检测-修正”一体化闭环控制的关键手段,一直是精密制造领域的研究热点。文章立足于机床精度全生命周期管控,系统综述了热误差建模补偿与在机测量技术的最新研究进展。首先,针对热误差控制,从误差检测与热特性分析、预测模型建模方法以及实时补偿实施策略三个维度进行了深度剖析;其次,针对在机测量,论述了测头系统误差辨识与综合补偿方法、对于测点的自适应采样策略以及多约束下的智能路径规划方法;最后,展望了机床精度全生命周期闭环控制的发展趋势,旨在为高精密数控机床的精度演化与稳健控制提供理论参考与技术支撑。

     

    Abstract: The equipment manufacturing industry is the foundation of the country and the foundation of a strong country. As its "industrial master machine", the precision guarantee capability of high-end CNC machine tools in a dynamic environment is directly related to the core competitiveness of major national strategic equipment. Among all kinds of error sources, thermal error has become the main bottleneck restricting precision machining accuracy due to its strong nonlinearity and time delay characteristics. On-machine measurement (OMM), as a key means to realize the closed-loop control of ''machining-detection-correction'' integration, has always been a research hotspot in the field of precision manufacturing. Based on the whole life cycle control of machine tool accuracy, the latest research progress of thermal error modelling and compensation and on-machine measurement technology is systematically reviewed. Firstly, for thermal error control, the three dimensions of error detection and thermal characteristic analysis, prediction modelling methods and real-time compensation implementation strategy are deeply analyzed. Secondly, for on-machine measurement, the error identification and comprehensive compensation method of the probe system, the adaptive sampling strategy for measuring points and the intelligent path planning method under multiple constraints are discussed. Finally, the development trend of closed-loop control of the whole life cycle of machine tool accuracy is prospected, which aims to provide theoretical reference and technical support for the accuracy evolution and robust control of high-precision CNC machine tools.

     

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