Study on Dynamic Characteristics of Motorized Spindle Rotor-Bearing-Housing System

doi:10.3901/JME.2021.13.026

Abstract

Abstract: Long-cantilever housing is introduced into motorized spindle for internal grinding of deep hole. The influence of the housing's flexible deformation on the rotor dynamics of the motorized spindle should be considered. However, the housing is simplified as a rigid body in the previous modelling for the motorized spindle, this assumption can not meet the requirement of dynamic analysis for such a complex motorized spindle in the study. The dynamic model of the rotor-bearing-housing system for the motorized spindle is established based on the whole transfer matrix method (WTMM) and duplex ball bearing analysis theory considering the flexible deformation of the housing. Critical speed and dynamic stiffness of the spindle are calculated using the model. A case study is carried out to reveal the effects of the housing's flexural rigidity and the bearing type on the dynamic characteristics of the motorized spindle. A motorized spindle with long-cantilever housing is developed, and its dynamic stiffness is detected to verify the dynamic model. The results show that, the proposed model can be used to analyze the dynamic behavior of the motorized spindle for internal grinding of deep hole. The dynamic performance of the motorized spindle is significantly improved by increasing the bending stiffness of the housing. Both the first order critical speed of the motorized spindle and the static stiffness of the spindle end are increased by replacing light series bearings with ultra-light series bearings.

Key words: motorized spindle, rotor dynamics, whole transfer matrix method, duplex bearing, dynamic characteristics

CLC Number:

TH113

JIANG Shuyun, LIN Shengye. Study on Dynamic Characteristics of Motorized Spindle Rotor-Bearing-Housing System[J]. Journal of Mechanical Engineering, 2021, 57(13): 26-35.

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