Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (9): 2432-2440.doi: 10.13229/j.cnki.jdxbgxb.20221411

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Vibration characteristics and precision reliability analysis of high-speed motorized spindle system

Xian-zhen HUANG1(),Bin GUO1,Zhi-yuan JIANG1,Ji-wu TANG2   

  1. 1.School of Mechanical Engineering and Automation，Northeastern University，Shenyang 110819，China
    2.School of Applied Technology，Dalian Ocean University，Dalian 116399，China
  • Received:2023-03-12 Online:2024-09-01 Published:2024-10-28

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Abstract:

In order to quantitatively analyze the influence of the randomness of the structure and material parameters of the high-speed motorized spindle system on the machining quality of the motorized spindle， a system model of motorized spindle， bearing and tool is established based on finite element method. The model considers the influence of mass eccentricity on the vibration characteristics of motorized spindle. In addition， the reliability analysis method of machining accuracy of electric spindle system is proposed by taking allowable tool tip vibration as threshold and combining with Kriging theory. Finally， the coupling effect of spindle speed and preload on tool vibration is analyzed by using the proposed method. The results show that the vibration reliability of tool tip caused by unbalance increases with the increase of spindle speed and bearing preload respectively.

Key words: motorized spindle, unbalance, vibration, reliability

CLC Number: 

  • TH122

Fig.1

Structural dimension drawing"

Fig.2

Finite element meshing"

Fig.3

Analysis of calculation results with different grid numbers"

Fig.4

Reliability analysis process based on Kriging model"

Fig.5

Total deformation result"

Fig.6

Influence of rotating speed on the amplitude of tool tip imbalance"

Fig.7

Determine the amplitude variation of the tool at the rotational speed"

Fig.8

Influence of eccentricity distance on amplitude"

Table 1

Principal axis parameter random variable"

设计变量分布类型均值标准差
L/mm正态分布405.52.025
D/mm正态分布1500.75
弹性模量Em/MPa正态分布2.1×1054.2×103
轴承刚度Kr/（N·mm-1）正态分布159 1003 182

Fig.9

Comparison between Kriging model and finite element model"

Fig.10

Relative error of Kriging model"

Fig.11

Reliability changes with rotational speed"

Fig.12

Reliability changes with bearing preload"

Fig.13

Mean reliability sensitivity"

Fig.14

Standard deviation reliability sensitivity"

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