Abstract
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.
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Foundation item: Projects(51575010, 51575009) supported by the National Natural Science Foundations of China; Project(Z1511000003150138) supported by Beijing Nova Program, China
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Cheng, Q., Ren, Wd., Liu, Zf. et al. Load-induced error identification of hydrostatic turntable and its influence on machining accuracy. J. Cent. South Univ. 23, 2558–2569 (2016). https://doi.org/10.1007/s11771-016-3317-4
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DOI: https://doi.org/10.1007/s11771-016-3317-4