Load-induced error identification of hydrostatic turntable and its influence on machining accuracy

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• 作者：Qiang Cheng 程强 ; Wei-da Ren 任伟达 ; Zhi-feng Liu 刘志峰&#8230
• 关键词：Key wordsmachine tool ; load ; induced error ; geometric error ; hydrostatic turntable ; screw theory
• 刊名：Journal of Central South University
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：23
• 期：10
• 页码：2558-2569
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Engineering, general; Metallic Materials;
• 出版者：Central South University
• ISSN：2227-5223
• 卷排序：23

文摘

In heavy duty machine tools, hydrostatic turntable is often used as a means for providing rotational motion and supporting workpiece, so the accuracy of turntable is crucial for part machining. In order to analyze the influence of load-indcued errors on machining accuracy, an identification model of load-induced errors based on the deformation caused by applied load of hydrostatic turntable of computerized numerical control (CNC) gantry milling heavy machine is proposed. Based on multi-body system theory and screw theory, the space machining accuracy model of heavy duty machine tool is established with consideration of identified load-induced errors. And then, the influence of load-induced errors on space machining accuracy and the roundness error of a milled hole is analyzed. The analysis results show that load-induced errors have a big influence on the roundness error of machined hole, especially when the center of the milled hole is far from that of hydrostatic turntable.