Bearing Wear Due to Mechanical Stresses and Electrical Currents

2009 ◽  
Author(s):  
S. Srinidhi ◽  
Mayank Tiwari ◽  
Rajni Burra ◽  
Hombe Gowda ◽  
Paul A. Siemers
Keyword(s):  
Surface Roughness ◽  
Electrical Properties ◽  
Electrical Discharge ◽  
Axial Load ◽  
Ball Bearing ◽  
Electrical Machines ◽  
Radial Load ◽  
Angular Contact Ball Bearing ◽  
Electrical Currents ◽  
Work Effect

Passage of current through moving conductive contacts results in electrical discharge and then melting of the material, which leads to wear. Such kind of bearing wear is common in electrical machines. There are however certain patterns which are unique to this kind wear. This wear pattern is called ‘fluting’, which are repetitive in nature. Electrical discharge can create higher surface roughness. Also the thermal and rheological properties of the lubricant play a big role in the film thickness formation. The passage of current through the lubricant also changes this and is determined by the electrical properties of the lubricant. In this work effect of bearing currents on a 7204 angular contact ball bearing is studied. This is tested with and without different cage materials with an axial load and no radial load, rotating at 2700 rpm. Four experiments were done at different-level of voltage, lube and cage material. Type of lubricant was seen to play a significant role in fluting.

Effects of raceway surface roughness in an angular contact ball bearing

2018 ◽  
Vol 121 ◽  
pp. 198-212 ◽  
Author(s):  
Wang Yunlong ◽  
Wang Wenzhong ◽  
Zhang Shengguang ◽  
Zhao Ziqiang
Keyword(s):  
Surface Roughness ◽  
Ball Bearing ◽  
Angular Contact Ball Bearing

Cage Instabilities in High-Speed Ball Bearings

2013 ◽  
Vol 278-280 ◽  
pp. 3-6 ◽  
Author(s):  
Zhen Huan Ye ◽  
Li Qin Wang
Keyword(s):  
Dynamic Model ◽  
Axial Load ◽  
High Speed ◽  
Ball Bearing ◽  
Rotation Speed ◽  
Ball Bearings ◽  
Radial Load ◽  
Mass Center ◽  
Clearance Ratio ◽  
Force Relationship

The dynamic model of the cage in high-speed ball bearing was developed according to the geometry and force relationship between bearing elements. Based on this dynamic model, cage instability was researched through mass center whirl. The effect of clearance ratio, load and bearing rotation speed on cage instability were studied by taking type 7004 angular ball bearing as an example. The results shown that the increase of clearance ratio and radial load makes cage stability lowered, and the cage stability could be enhanced by increasing the axial load and bearing rotation speed.

Computational-experimental research of the stiffness of high-speed spindles

2020 ◽  
pp. 33-39
Author(s):  
I.A. Zverev
Keyword(s):  
Elastic Deformation ◽  
Experimental Research ◽  
Rotational Speed ◽  
High Speed ◽  
Ball Bearing ◽  
Deformation Model ◽  
Ball Bearings ◽  
Radial Load ◽  
Angular Contact Ball Bearing ◽  
Spindle Unit

The stiffness indices of high-speed spindle units on angular contact ball bearings at high rotational speeds are investigated. It is found, that the spindle rotational speed, radial load, bearing temperature, type and magnitude of the preload in the bearings significantly affect the stiffness of the spindle unit. Keywords: high-speed spindle unit, angular contact ball bearing, elastic-deformation model. [email protected]

Experimental research on cage motion with different pocket shapes in angular contact ball bearing

2021 ◽  
pp. 135065012110593
Author(s):  
Dujuan Yuan ◽  
Ruixiang Wang ◽  
Shijin Chen ◽  
Xiaoyang Chen
Keyword(s):  
Experimental Research ◽  
Ball Bearing ◽  
Slip Rate ◽  
Operating Conditions ◽  
Radial Load ◽  
Test Rig ◽  
Angular Contact Ball Bearing ◽  
Slip Rates ◽  
Rotating Speed ◽  
Displacement Sensors

The cage motion with different pocket shapes, such as spherical, square, and cylindrical, in an angular contact ball bearing under different operating conditions are studied experimentally. A test rig with two laser displacement sensors is used to obtain the displacements of the cage in five freedom degrees. The results reveal that these three type cage shapes have different trends of the centroid trajectory versus rotating speed or radial load. The whirling radius is equal to half of the pocket clearance for the spherical pocket, and half of the guiding clearance for both square and cylindrical pocket. The slip rates of all cages decrease with increasing radial load, and increase with rotating speed. Both inclination angel and slip rate of the spherical, cylindrical and square pocket decrease in turn.

Radial Stiffness of Spring Preloaded Angular Contact Ball Bearing under Dynamic Radial Load

2018 ◽  
Author(s):  
Nao Hayashi ◽  
Tomoya Sakaguchi ◽  
Tomoya Nakamura ◽  
Satoshi Kawasaki ◽  
Masaharu Uchiumi
Keyword(s):  
Ball Bearing ◽  
Radial Load ◽  
Angular Contact Ball Bearing ◽  
Radial Stiffness

Life calculation of angular contact ball bearings for industrial robot RV reducer

2019 ◽  
Vol 71 (6) ◽  
pp. 826-831
Author(s):  
Fukang Deng ◽  
Kangchun Li ◽  
Xiongfeng Hu ◽  
Haifu Jiang ◽  
Fuchuan Huang
Keyword(s):  
Ball Bearing ◽  
Great Influence ◽  
Variable Load ◽  
Ball Bearings ◽  
Radial Load ◽  
Angular Contact Ball Bearing ◽  
Operating Condition ◽  
Content Type ◽  
Actual Operating ◽  
Rv Reducer

Purpose The purpose of this paper is to analyze the force and basic rating life of angular contact ball bearings of RV reducer under the actual operating condition. Design/methodology/approach Force analysis of angular contact ball bearing under the actual operating condition, calculate the axial, radial load and internal load distribution, calculate the basic rating life of angular contact ball bearing under variable load conditions. Findings The external load has a great influence on the radial load of angular contact ball bearing, further affecting the basic rating life of angular contact ball bearing, which is a great influence on the overall life of RV reducer under the condition of high frequency and heavy load. Originality/value This paper provides important ideas for the design and manufacture of RV reducer in theory and experiment technology.

Thermal Evaluation of a Dry Nonrotating Thin Section Contact Bearing

1996 ◽  
Vol 118 (4) ◽  
pp. 610-614 ◽  
Author(s):  
E. W. Spence ◽  
D. A. Kaminski
Keyword(s):  
Thermal Resistance ◽  
Axial Load ◽  
Ball Bearing ◽  
Elastic Stress ◽  
Hertzian Contact ◽  
Contact Theory ◽  
Difference Model ◽  
Angular Contact Ball Bearing ◽  
Outer Race ◽  
Hertzian Contact Theory

The thermal resistance of an angular contact ball bearing as a function of the radial and axial load is investigated numerically. An elastic stress analysis, based on Hertzian contact theory, provides circumferentially-varying contact areas for input to the thermal model. A finite difference model of the combined conductive, convective and radiative transport from the inner to outer race is used to calculate the overall thermal resistance of the bearing.

Recent Patents on the Angular Contact Ball Bearing of High-Speed Motorized Spindle

2020 ◽  
Vol 13 ◽  
Author(s):  
Yudong Bao ◽  
Linkai Wu ◽  
Yanling Zhao ◽  
Chengyi Pan
Keyword(s):  
High Speed ◽  
Ball Bearing ◽  
Rapid Development ◽  
Ceramic Materials ◽  
Development Trend ◽  
Numerical Control ◽  
Angular Contact Ball Bearing ◽  
Practical Applications ◽  
High Speed Cutting ◽  
Advantages And Disadvantages

Background:: Angular contact ball bearings are the most popular bearing type used in the high speed spindle for machining centers, The performance of the bearing directly affects the machining efficiency of the machine tool, Obtaining a higher value is the direction of its research and development. Objective:: By analyzing the research achievements and patents of electric spindle angular contact bearings, summarizing the development trend provides a reference for the development of electric spindle bearings. Methods:: Through the analysis of the relevant technology of the electric spindle angular contact ball bearing, the advantages and disadvantages of the angular contact ball bearing are introduced, and the research results are combined with the patent analysis. Results:: With the rapid development of high-speed cutting and numerical control technology and the needs of practical applications, the spindle requires higher and higher speeds for bearings. In order to meet the requirements of use, it is necessary to improve the bearing performance by optimizing the structure size and improving the lubrication conditions. Meanwhile, reasonable processing and assembly methods will also have a beneficial effect on bearing performance. Conclusion:: With the continuous deepening of bearing technology research and the use of new structures and ceramic materials has made the bearing's limit speed repeatedly reach new highs. The future development trend of high-speed bearings for electric spindles is environmental protection, intelligence, high speed, high precision and long life.

Temperature Rise Prediction of Oil-Air Lubricated Angular Contact Ball Bearings Using Artificial Neural Network

2019 ◽  
Vol 12 (3) ◽  
pp. 248-261
Author(s):  
Baomin Wang ◽  
Xiao Chang
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Temperature Rise ◽  
High Speed ◽  
Ball Bearing ◽  
Influence Factors ◽  
Ball Bearings ◽  
Ann Model ◽  
Angular Contact Ball Bearing ◽  
Artificial Neural

Background: Angular contact ball bearing is an important component of many high-speed rotating mechanical systems. Oil-air lubrication makes it possible for angular contact ball bearing to operate at high speed. So the lubrication state of angular contact ball bearing directly affects the performance of the mechanical systems. However, as bearing rotation speed increases, the temperature rise is still the dominant limiting factor for improving the performance and service life of angular contact ball bearings. Therefore, it is very necessary to predict the temperature rise of angular contact ball bearings lubricated with oil-air. Objective: The purpose of this study is to provide an overview of temperature calculation of bearing from many studies and patents, and propose a new prediction method for temperature rise of angular contact ball bearing. Methods: Based on the artificial neural network and genetic algorithm, a new prediction methodology for bearings temperature rise was proposed which capitalizes on the notion that the temperature rise of oil-air lubricated angular contact ball bearing is generally coupling. The influence factors of temperature rise in high-speed angular contact ball bearings were analyzed through grey relational analysis, and the key influence factors are determined. Combined with Genetic Algorithm (GA), the Artificial Neural Network (ANN) model based on these key influence factors was built up, two groups of experimental data were used to train and validate the ANN model. Results: Compared with the ANN model, the ANN-GA model has shorter training time, higher accuracy and better stability, the output of ANN-GA model shows a good agreement with the experimental data, above 92% of bearing temperature rise under varying conditions can be predicted using the ANNGA model. Conclusion: A new method was proposed to predict the temperature rise of oil-air lubricated angular contact ball bearings based on the artificial neural network and genetic algorithm. The results show that the prediction model has good accuracy, stability and robustness.

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