Preload has a significant effect on the precision of machine tool spindle, and it changes transiently in different operating conditions. In this paper, the transient feature of spindle preload under multi-factor coupled effect was discussed theoretically and experimentally. By adopting the transient network method and the time-discrete approach, the integrated thermo-mechanical model of a spindle was established. The axial and radial deformations of spindle system, induced by centrifugal force, thermal, and assembly stresses, were all discussed. The effects of the various factors on the transient preload were analyzed, and results show that speed and temperature contribute the most to the transient preload, followed by the bearing deflection. Finally, experimental results indicate the correctness of the improved model.
LiXLiHHongJ, et al.Heat analysis of ball bearing under nonuniform preload based on five degrees of freedom quasi-static model. Proc IMechE, Part J: J Engineering Tribology2015; 230: 709–728.
2.
WuWLiXXuF, et al.Investigating effects of non-uniform preload on the thermal characteristics of angular contact ball bearings through simulations. Proc IMechE, Part J: J Engineering Tribology2014; 228(6): 667–681.
3.
HwangYKLeeCM. A review on the preload technology of the rolling bearing for the spindle of machine tools. Int J Precis Eng Manuf2010; 11: 491–498.
4.
ChenJSChenKW. Bearing load analysis and control of a motorized high speed spindle. Int J Mach Tools Manuf2005; 45(12): 1487–1493.
5.
JiangSMaoH. Investigation of variable optimum preload for a machine tool spindle. Int J Mach Tools Manuf2010; 50: 19–28.
6.
HagiuGD. Reliable high speed spindles by optimum bearings preload. Int J Appl Mech Eng2003; 8: 57–70.
7.
Tsuneyoshi T. Spindle preload measurement and analysis. In: Proceedings of ASPE summer topical meeting, State College, PA, 11–12 June 2007.
8.
ZhouZCWangYQWuWW, et al.Thermally induced preload and stiffness calculation for machine tool spindle bearing. J Xi'an Jiaotong Univ2015; 49: 111–116.
9.
LinCWTuJFKammanJ. An integrated thermo-mechanical-dynamic model to characterize motorized machine tool spindles during very high speed rotation. Int J Mach Tools Manuf2003; 43: 1035–1050.
10.
SteinJLTuJF. A state-space model for monitoring thermally induced preload in anti-friction spindle bearings of high-speed machine tools. J Dyn Syst Meas Contr Trans ASME1994; 116: 372–386.
11.
BossmannsBTuJF. A thermal model for high speed motorized spindles. Int J Mach Tools Manuf1999; 39: 1345–1366.
12.
LiHShinYC. Integrated dynamic thermo-mechanical modeling of high speed spindles. part 1 model development. J Manuf Sci Eng2004; 126: 148–158.
13.
Tu JF and Stein JL. On-line preload monitoring for anti-friction spindle bearings of high-speed machine tools. Journal of Dynamic Systems, Measurement, and Control 1995; 117: 43–53.
14.
PalmgrenA. Ball and roller bearing engineering, Philadelphia: Philadelphia Skf Industries Inc, 1959.
15.
YanKHongJZhangJ, et al.Thermal-deformation coupling in thermal network for transient analysis of spindle-bearing system. Int J Therm Sci2016; 104: 1–12.
16.
CaoH. Centrifugal expansion of high-speed spindle and its influences on bearing dynamic characteristics. J Mech Eng2012; 48: 59.
17.
HolkupTCaoHKolářP, et al.Thermo-mechanical model of spindles. CIRP Ann Manuf Technol2010; 59: 365–368.
18.
HarrisTAKotzalasMN. Advanced concepts of bearing technology: rolling bearing analysis, 5th ed. Boca Raton: CRC Press, 2007.
19.
Kim W, Lee CM and Hwang YK. A study on the shrink fits and internal clearance variation for ball bearing of machine tool using FEM. In: International multiconference of engineers and computer scientists, Hong Kong, China, 18–20 March 2009.
