An Intelligent Thermal Error Compensation System for CNC Machining Centers

一種智慧型綜合加工之熱誤差補償系統

范光照(Kuang-Chao Fan)

《中國機械工程學刊》 28卷1期 (2007/02) Pp. 91-97

https://doi.org/10.29979/JCSME.200702.0011

摘要

本文針對工具機熱誤差補償技術中，熱誤差模型建立的主要困難例如：溫度感測器放置點、長時間的熱誤差建模及熱誤差模型的強健性等進行研究分析。發展溫度感測器最佳放置點原理與方法及快速熱誤差模型建立技術。不同於ISO230-3規範所提的空切削熱誤差建模法，本文提出更符合實際的實切削熱誤差建模法。以AD590 I.C.型溫度感測器偵測最佳放置點的溫度變化，以標準桿配合觸發式探頭進行切削中熱誤差線上量測。將實驗結果以線性迴歸分析建立切削中熱誤差預測模型。並發展單板電腦硬體補償器，以8051微處理器為核心，透過工具機參考原點漂移的方式直接補償預測熱誤差值。實際切削工件驗證的結果顯示，主軸熱變形的誤差經由補償的方式可以大幅降低至10µm之內。

並列摘要

A measurement and compensation control system for the spindle thermal expansion of machine tools has been developed in this study. The low cost but accurate thermal sensor of AD 590 IC and the tool setting probe MP4 of Renishaw Co. were developed for the measurements of temperature and spindle expansion respectively. Instead of the non-cutting condition as specified by the ISO230-3, the proposed thermal error model is derived from the real cutting condition. With the proper selection of sensor locations, a linear error model with respect to only one or two temperature terms could always be single board computer was then developed to compensate for the thermal error in real time. As the error model can be generated in one day under hazard conditions and the whole system is low cost, this system is suitable for industrial use. The intelligent features of this system include: fast model generation, self-malfunction detection, real-time temperature display, EMI removal, automatic compensation, and suitable for most ambient conditions. Experimental tests show the thermal error of a general type CNC machining center can be controlled to within 10µm.

並列關鍵字

Machine Tool ； Thermal Error ； Real cutting condition ； Error compensation