Bearing preload optimization for machine tool spindle by the influencing multiple parameters on the bearing performance

Abstract

The bearing preload plays an important role on the bearing performance, particularly the important characteristics of the bearing include bearing temperature increases, the bearing fatigue life, and ball skidding. Generally, the bearing preload contains the initial bearing preload and the thermal-induced bearing preload. Moreover, the bearing performance is closely related to machine tool accuracy. Obtaining an optimal bearing preload can improve the spindle work accuracy of machine tools. A method for determining optimal bearing preload over a wide range of speeds is given in this article. The method is based on the aforementioned factors that affect bearing performance, synthetically considering the initial preload and thermal-induced bearing preload, and it is verified both experimentally and with simulations. The results show that there is a minimum bearing preload value for avoiding the bearing ball skidding; the bearing temperature rise more than 30°C can be hardly achieved in the normal speed range, the fatigue life decides the biggest bearing preload; and the method is applicable to machine tool spindle usage.

The bearing parallel misalignment running model–based machine tool spindle thermal error analysis

“…The spindle system thermal error, with deviations, was generated by an FEA model, based on a model previously described in our laboratory 15 and Jiang and Mao. 16 The comparative results for the simulation versus empirically derived measurements in condition of spindle speed of 3000 r/min and an axial load of 800 N are presented in Figure 11, and the axial load 800 N is selected for limiting the ball skidding which is clarified in Dong et al 17 Normally, the Z direction thermal error should have the smallest slope, because the spindle system has absolute symmetry structure. However, it was observed that the parallel bearing installation misalignment has a greater influence on the spindle thermal error in the Z direction than in the X and Y directions.…”

Research Development of Preload Technology on Angular Contact Ball Bearing of High Speed Spindle: A Review

“…By combining the bearing fatigue life model and the internal stress distribution model, Xu [47] optimized the preload based on multi-parameter criteria with respect to bearing life reliability condition, analyzed the rotation influence on internal stress distribution and contact angle variation, obtained the optimal preload by adjusting the reliability of the fatigue life model. Dong [54] proposed a complete calculation method to obtain the optimal preload, with impact factors such as bearing stiffness, temperature rise, fatigue life and ball sliding considered. Figure 9 [54] is the relationship between the optimal preload when the three factors acting simultaneously, where the bearing skidding is the [54] minimum boundary condition, the relationship between the initial preload and the fatigue life is the maximum boundary condition for preload computation.…”

“…Dong [54] proposed a complete calculation method to obtain the optimal preload, with impact factors such as bearing stiffness, temperature rise, fatigue life and ball sliding considered. Figure 9 [54] is the relationship between the optimal preload when the three factors acting simultaneously, where the bearing skidding is the [54] minimum boundary condition, the relationship between the initial preload and the fatigue life is the maximum boundary condition for preload computation.…”

Optimization of Factors Affecting Vibration Characteristics of Unbalance Response for Machine Motorized Spindle Using Response Surface Method

“…Recently, considerable researches have been carried out to improve the vibration response characteristics of MMS. The effects of design variables or operation parameters on system dynamics response have been covered with the inclusive variety of researches [6][7][8][9][10][11][12]. These previous researches were focused on improving the dynamic performances of highspeed (HS) motorized spindle through optimizing the design factors.…”