IMPROVING ACCURACY OF CNC MACHINE
TOOLS THROUGH COMPENSATION
FOR THERMAL ERRORS
Abstract： A method for improving accuracy of CNC machine tools through compensation for the thermal errors is studied. The thermal errors are obtained by 1-D ball array and characterized by an auto regressive model based on spindle rotation speed. By revising the workpiece NC machining program , the thermal errors can be compensated before machining. The experiments on a vertical machining center show that the effectiveness of compensation is good.
Key words : CNC machine tool Thermal error Compensation
0 INTRODUCTION
Improvement of machine tool accuracy is essential to quality cont rol in manufacturing processes. Thermally induced errors have been recognized as the largest cont ributor to overall machine inaccuracy and are probably the most formidable obstacle to obtaining higher level of machine accuracy. Thermal errors of machine tools can be reduced by the st ructural improvement of the machine tool it self through design and manufacturing technology. However , there are many physical limitations to accuracy which can not be overcome solely by production and design techniques. So error compensation technology is necessary. In the past several years , significant effort s have been devoted to the study. Be數控機床相關畢業設計翻譯通過熱量誤差補償來改善數控機床的精確度
摘 要：通過熱量誤差補償來改變數控機床的精度是一種可行的方法。熱量誤差的獲得是通過1-D滾珠排列和建立在錠子轉速基礎上的自動退刀的表征。通過改變工件的數控程序，熱量誤差在機加工以前可以被補償。試驗表明直立的加工中心的實際補償是可行的。
關鍵詞： 數控加工中心, 熱量誤差,補償
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