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Effect of grease on bearing vibration performance caused by short-time high-temperature exposure

  • Can Wu
  • Ruifeng Xiong
  • Jing NiEmail author
  • Paul D. Teal
  • Maolai Cao
  • Xinling Li
Technical Paper
  • 69 Downloads

Abstract

A short-time high-temperature environment is a common working condition in the use of bearings; it can occur as rapid heating before interference assembly of a bearing, or in a quick shutdown due to failure and heating of other parts of equipment. However, the current research mainly focuses on the influence of long-term high temperatures on bearing lubrication. In this paper, the 6204DDU ball bearing with lithium soap/mineral oil (paraffin base type) grease and fatty acid soap/mineral oil (refined white oil) grease (white grease) is investigated. The recovery performance of the two greases after a short-time high temperature is studied. It is found that a large number of fractures occur in the soap fibre of the white grease after 20 min exposure in 140 °C temperature environments, while lithium grease remains in a good working condition. The vibration velocity with white grease decreases during a temperature falls from 110 °C to the heated balanced temperature, while the vibration velocities with lithium grease is without significant fluctuations. Before and after heating, the vibration velocities in middle frequency band of rolling bearings with lithium grease and white grease increase with the increase in preload, but it is the opposite in the high frequency band except for white grease after heating condition. Infiltration with a small amount of water or oil can greatly affect the performance of white grease. Water can emulsify the white oil and accelerates the oxidation of white grease. The structure of the L-AN32 oil contaminant is different from that of white oil, resulting in uneven dispersion of saponified crystals and obvious flocculent agglomeration is presented.

Keywords

Short-time high temperature Lithium grease White grease Ball bearing Vibration 

List of symbols

d

Bearing inner diameter (mm)

D

Bearing outside diameter (mm)

B

Bearing width (mm)

z

Number of rolls

n

The revolving speed (r/min)

λ

Wavelength of the surface roughness or waviness (mm)

f

Vibration frequency of the bearing (Hz)

x

Displacement (mm)

m

The mass of one rolling body (kg)

C

Damping coefficient (N s/mm)

K

Stiffness coefficient (N/mm)

ω

Rolling body natural frequency (Hz)

Hmin

Dimensionless minimum film thickness

U

Dimensionless speed parameter

G

Dimensionless material parameter

W

Dimensionless load parameter

k

Elliptical eccentricity parameter

η0

Slide oil dynamic viscosity (Pa s)

Effective elastic modulus (N/mm2)

Vm

Average bearing speed (mm/s)

Rx

Effective radius in the x direction (mm)

Ry

Effective radius in the y direction (mm)

a1

Viscosity coefficient of lubricating oil (Pa−1)

F

Load (N)

hmin

Minimum film thickness (mm)

Koil

Oil film stiffness (N/mm)

Abbreviations

LG

Lithium grease

WG

White grease

BT

Balanced temperature

HBT

The temperature returned to BT after heating

LF

Low frequency band

MF

Median frequency band

HF

High frequency band

PSD

Power spectrum density

RMS

Root mean square value

WG-W

White grease mixed water

WG-O

White grease mixed oil (L-AN32)

PAO10

Poly Alpha Olefin 10

Notes

Acknowledgements

The work was supported by National Key R&D Program of China (Grant Nos. 2017YFB1301300, 2018YFB2000400) and Natural Science Foundation of Zhejiang Province (Grant No. LY19E050014).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interests.

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.School of Mechanical EngineeringHangzhou Dianzi UniversityHangzhouChina
  2. 2.School of Engineering and Computer ScienceVictoria University of WellingtonWellingtonNew Zealand
  3. 3.Hangzhou Bearing Test & Research Center Co. LtdHangzhouChina

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