Comprehensive compensation method for thermal error of a vertical drilling center

To eliminate the influence of thermally induced error of machine tool on the machining accuracy, a comprehensive error compensation method for the thermal displacement of the screw shaft and spindle is put forward. Based on heat transfer mechanism and experimental analysis, the model of the screw thermal expansion error is built. Similarly, the modeling of the spindle thermal growth depending on speed variations is proposed. Then, the thermal tests for studying thermal behavior of the spindle and screw axis are carried out on the vertical drilling center TC500R.Finally, the compensation effect of the robust model is validated via experimental test and machining. The experimental results show that the thermal displacement variations are controlled within 2 when the compensation system is activated. The suggested model can achieve high accuracy and well applicability of different moving state. The machining results indicate that the dimensional accuracy of the workpiece is significantly improved after implementation of the compensation. The feasibility of the thermal error compensation system can satisfy in application on the drilling operation.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author