Study on the Dynamic Characteristics and Fatigue Life of a Spindle-Bearing System for Large Machine Tools

Authors:
  • HOHyeon-Il Oh
    Hyeon-Il Oh
  • SKSun-Woong Kwon
    Sun-Woong Kwon
  • WPWoo-Sang Park
    Woo-Sang Park
  • SHSeong-Wook Hong
    Seong-Wook Hong
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Abstract
The spindle-bearing system is one of the main components that determine the overall performance of machine tools. It is important to accurately predict the characteristics of a spindle-bearing system because the dynamic characteristics of the spindle-bearing system has a significant effect on the performance of the machine tool. In this paper, the dynamic characteristics of a large spindle system supported by angular contact ball bearing (ACBB) considering rotational speed and cutting load were studied. To this end, the equilibrium equations of the spindle system were derived and repeatedly solved to overcome the statistically indeterminate characteristics. Important characteristics of spindle-bearing system such as bearing stiffnesses, bearing fatigue life and spindle natural frequency were estimated with varying the rotating speed and the radial cutting load. The characteristics with regard to several parameters affecting bearing fatigue life were investigated.
Funding Information
  • Korea Institute for Advancement of Technology

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