Thermal-structure interaction characteristics of a high-speed spindle- bearing system

• Published in: International journal of machine tools & manufacture Vol. 137; pp. 42 - 57
• Main Authors: Liu, Jialan, Ma, Chi, Wang, Shilong, Wang, Sibao, Yang, Bo, Shi, Hu
• Format: Journal Article
• Language: English
• Published: Elmsford Elsevier Ltd 01.02.2019; Elsevier BV
• Subjects: Bearing; Bearings; Boundary conditions; Closed-loop iterative modeling; Deformation mechanisms; Error compensation; Heat generation; Heat sources; High speed; Iterative methods; Lubricants; Mathematical models; Model accuracy; Modelling; Morphology; Spindle-bearing system; Temperature distribution; Temperature field distribution; Thermal analysis; Thermal deformation variation; Thermal-structure interaction; Temperature field distribution; Spindle-bearing system; Closed-loop iterative modeling; Thermal-structure interaction; Thermal deformation variation
• ISSN: 0890-6955; 1879-2170
• DOI: 10.1016/j.ijmachtools.2018.10.004

The neglection of thermal-structure interaction of high-speed spindle system may lead to the modeling error of the thermal characteristics. To improve the modeling accuracy, the thermal-structure interaction mechanism was analyzed and the closed-loop iterative modeling method of thermal characteristics was proposed to modify the heat sources and thermal boundary conditions of the spindle system in each substep. The heat generation of bearings and built-in motor, the convective coefficients and the thermal contact resistances (TCRs) of bearing joints were computed. The heat generation of bearings was calculated by the SKF bearing thermal model and the results were compared with that obtained by integral method. The heat generation of bearings was modified by considering the combined effect of the lubricant viscosity variation and thermally-induced preload of bearings. Moreover, a novel geometrical-mechanical-thermal model for TCRs was proposed by characterizing the rough surface morphology and by establishing the multi-scale contact mechanics of joint surfaces. To validate the effectiveness of the proposed method, the thermal characteristic experiments of the spindle system were conducted under different rotational speeds. The results showed that the modeling errors in the temperature field and thermal deformation are reduced significantly and that this model has the ability of thermal error compensation. [Display omitted] •A closed-loop modeling method is proposed to analyze thermal-structure interaction characteristicof spindle system.•Interaction between temperature and thermal deformation is realized by updating heat source and boundary condition.•A novel geometrical-mechanical-thermal predictive model for thermal contact resistance is proposed.•SKF model is much accurate than the integral method based on the quasi-static mechanics analysis of bearings.•Modeling accuracy could be improved by taking TCR and the thermal-structure interaction into consideration.