scholarly journals A Design of Partial Textured Surface on Gear Washers for Reducing Friction and Wear under Low Speed and Heavy Load Conditions

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4666
Author(s):  
Yang Liu ◽  
Hui Zhang ◽  
Guangneng Dong
Keyword(s):  
Friction Coefficient ◽  
Friction And Wear ◽  
Surface Texturing ◽  
Experimental Tests ◽  
Stribeck Curve ◽  
Textured Surface ◽  
Heavy Load ◽  
Low Speed ◽  
Sector Angle ◽  
Load Conditions

This paper presents the effort to reduce friction and wear of gear washers under low-speed and heavy-load conditions by designing the arrangement of surface textures. The influence of distributional parameters of textures on load-bearing capacity and friction coefficient of gear washers are studied numerically to obtain a preferable surface texturing design. Then, experimental tests were carried out to plot the Stribeck curves of the obtained texture arrangement compared with bare surface and another unoptimizable texture distribution arrangement to facilitate the verification of the simulation results. Theoretical predictions illustrate that the annular gear washers with partial surface texturing provide lower friction coefficients than bare washers. Textures having a sector angle of 20°, a coverage angle of 12°, a circumferential number of 8, and a radial number of 6 are selected as the final optimal surface texture distribution design. Experimental results confirm that the obtained texture arrangement moves the Stribeck curve towards the lower left, indicating thickening of oil film thickness and reduction in friction coefficient. In addition, the weight loss caused by wear is also reduced by the optimized texture design.

Experimental study on friction coefficient and temperature rise of heavy-load grease-lubricated spherical plain bearings with surface texture

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jinlong Shen ◽  
Tong Zhang ◽  
Jimin Xu ◽  
Xiaojun LIU ◽  
Kun Liu
Keyword(s):  
Friction Coefficient ◽  
Temperature Rise ◽  
Surface Texture ◽  
Tribological Performance ◽  
Textured Surface ◽  
Textured Surfaces ◽  
Roughness Parameters ◽  
Heavy Load ◽  
Friction Coefficients ◽  
Content Type

Purpose This paper aims to improve the tribological performance of grease-lubricated spherical plain bearings (SPBs) under heavy load, dimple-type textures were prepared by laser on the outer surface of the inner ring. The influence of roughness parameters of a textured surface on reducing friction coefficient and temperature rise was also explored. Design/methodology/approach This study adopts a laser processing method to fabricate dimple-type textures. Three-dimensional roughness parameters were used to characterize the textured surfaces. The friction coefficients of five SPBs with surface texture and one original commercially available SPB without surface texture under different nominal loads were measured on a self-established test rig. The data of temperature rise were obtained by nine embedded thermal couples. Findings The results indicate that SPBs with textures generally exhibit lower friction coefficients than the original SPB without textures. The dimple depth has a significant influence on improving the tribological performance, which coincides with the analysis by surface roughness parameters. A textured surface with negative Ssk and high Vvc has the minimum temperature rise. Originality/value As it is too difficult to arrange sensors into heavy-load SPBs, there are few reports about the temperature characteristics. Through nine embedded thermal couples, the distribution of temperature rise on the inner ring of SPBs was given in this study. The positive effect of surface texture on reducing temperature rise and friction coefficient was verified, which is beneficial for the design of heavy-load SPBs.

scholarly journals Surface Texturing Technique Based on Ultrasonic Turning for Improving Tribological Properties

2022 ◽  
Vol 16 (1) ◽  
pp. 78-86
Author(s):  
Keisuke Hara ◽  
Toshihiro Fukuda ◽  
Kyosuke Taguchi ◽  
Hiromi Isobe ◽  
◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Radial Direction ◽  
Principal Direction ◽  
Surface Texturing ◽  
Target Surface ◽  
Textured Surface ◽  
Rotation Direction ◽  
Lubrication Performance ◽  
Efficiency Performance

Tribological properties such as lubrication, friction, and wear resistance greatly affect machine operation efficiency, performance, and service life. Surface texturing methods such as scraping can be used to improve these properties. Scraping creates many small depressions on the target surface. These depressions, which are evenly distributed, function as oil holes and thus improve lubrication performance. This paper describes a surface texturing technique based on ultrasonic vibration-assisted turning (UVAT) that simultaneously improves tribological properties and machinability. In UVAT, the cutting tool is oscillated mainly in the principal direction. Vibration in the radial direction, which is induced by Poisson deformation, periodically digs up or pushes the workpiece surface in the radial direction, creating a textured surface. A surface subjected to UVAT has periodic depressions along the workpiece rotation direction. The texturing rate of UVAT is up to 6700 mm2/min, which is higher than that of manual scraping. To evaluate the tribological performance of a surface textured by UVAT, the friction coefficient between a stainless steel pin and the surface was measured under oil dipping conditions. The results of friction experiments show that the friction coefficient of the UVAT-treated surface and its fluctuation were lower than those of a conventional turned surface. The UVAT-treated surface had stable friction properties.

scholarly journals Corrosion Wear Performance of Pure Titanium Laser Texturing Surface by Nitrogen Ion Implantation

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 990 ◽  
Author(s):  
Lin Cao ◽  
Yun Chen ◽  
Jie Cui ◽  
Wei Li ◽  
Zhidan Lin ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Ion Implantation ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Textured Surface ◽  
Artificial Joints ◽  
Nitrogen Ion Implantation ◽  
Nitrogen Ion

The poor tribological performances of titanium have significantly limited its applications in the field of artificial joints. In order to solve problems regarding the wear and corrosion of artificial joints in the body, we fabricated the composite materials utilizing the combination of laser surface texturing and nitrogen ion implantation technology, and investigated the effect of laser surface texturing, nitrogen ion implantation, and different dimple area densities on tribological performance. The results show that the textured surface could reduce the friction coefficient and improve the wear resistance, and the optimum dimple density was found to be 25%. After N ion implantation, the wear resistance of the textured sample was further improved, due to the formation of the nitride layer. Moreover, as shown by the electrochemical test results, the corrosion resistance was enhanced significantly. The friction coefficient decreased the most, and the wear resistance increased by 405% with the lowest wear rate of 0.37 × 10−3 mm3/N·m. However, the specimen with a dimple density of 60% had the worst wear resistance. The results of the study provide a basis for the development and application of artificial joint materials.

Effect of surface texture on the frictional properties of grease lubricated spherical plain bearings under reciprocating swing conditions

2016 ◽  
Vol 231 (1) ◽  
pp. 125-135 ◽  
Author(s):  
Zhanqi Tang ◽  
Xiaojun Liu ◽  
Kun Liu
Keyword(s):  
Friction Coefficient ◽  
Surface Texture ◽  
Surface Texturing ◽  
Roughness Parameters ◽  
Frictional Properties ◽  
Texture Parameters ◽  
Low Load ◽  
Hydraulic Servo ◽  
Load Conditions ◽  
Effect Of Surface

Surface texturing is a widely used method to improve the tribological performance of the mechanical systems. To introduce the surface texture into the mechanical components, this study experimentally examined the frictional behaviors of grease lubricated spherical plain bearings under mixed lubrication conditions on an electro-hydraulic servo tribological test rig. The effects of the surface texture parameters and roughness parameters on the frictional properties of bearings were investigated. The results showed that higher dimple depths and lower dimple densities would result in a distinct improvement on the friction coefficients. A maximum reduction of 55% was gained for the textured sample under running conditions compared with the untextured one. In addition, the surface roughness parameters also influence the frictional behaviors. In the high load conditions, the friction coefficient decreases while the Ssk value gets more negative, even though the Sa value is much higher. On the other hand, in the low load conditions, when the value of Ssk varies between −5 and −1, the influence of the value of Sa on the friction coefficient becomes obvious, a higher Sa value results in a higher friction coefficient.

Laser surface texturing and its contribution to friction and wear reduction: a brief review

2016 ◽  
Vol 68 (1) ◽  
pp. 57-66 ◽  
Author(s):  
Ahmad Firdaus Shamsul Baharin ◽  
Mariyam Jameelah Ghazali ◽  
Juyana A Wahab
Keyword(s):  
Friction And Wear ◽  
Laser System ◽  
Surface Texturing ◽  
Laser Surface Texturing ◽  
Textured Surface ◽  
Laser Beam Machining ◽  
Content Type ◽  
Excellent Method ◽  
Coated Surface ◽  
Wear Reduction

Purpose – The purpose of this paper is to make people aware of the increase usage of laser system in surface texturing process. Design/methodology/approach – As it is a brief review paper, no particular method was used. Findings – It has been found that most of the surface texturing methods used mas laser beam machining using Nd:YAG laser. It shows that the realization of the textured surface helps to reduce friction and wear which can increase the life span of a material. Research limitations/implications – Most of the texturing is done on the substrates directly, and few research were conducted on coated surface of the material, which coating is also known as an excellent method to improve tribological properties. Originality/value – The paper shows details on the recent development of surface texturing and its contribution to friction and wear reduction.

Mixed thermal elastohydrodynamic lubrication analysis with dynamic performance of aero ball bearing during start-up and shut-down

2020 ◽  
Vol 234 (6) ◽  
pp. 873-886
Author(s):  
Xiujiang Shi ◽  
Jiqiang Wu ◽  
Bin Zhao ◽  
Xuan Ma ◽  
Xiqun Lu
Keyword(s):  
Boundary Lubrication ◽  
Ball Bearing ◽  
Dynamic Performance ◽  
Elastohydrodynamic Lubrication ◽  
Heavy Load ◽  
Low Speed ◽  
Start Up ◽  
Ball Number ◽  
Lubrication Properties ◽  
Load Conditions

In this study, a coupling model is developed to include the aero ball bearing dynamic performance in the mixed thermal elastohydrodynamic lubrication analysis, and the low-speed and heavy-load conditions during start-up and shut-down are involved. Based on the bearing quasi-dynamics, the inside motion state of the main loading surface is obtained, and the mixed thermal elastohydrodynamic lubrication is conducted to get bearing lubrication state and properties. The numerical lubrication model under low-speed and heavy-load conditions is validated against published tested data, which reveal well consistency in central film thickness. The lubrication properties between a single ball and inner race during start-up have been studied, which indicate the lubrication film transforms from boundary lubrication to unsafe mixed thermal elastohydrodynamic lubrication, and then goes into safe lubrication. The lubrication properties of the balls at different azimuths have been investigated during shut-down and compared with those in start-up, which have a similar opposite changing trend, but not a simple invertible process. The time in boundary lubrication region during shut-down is shorter, and the ball number in boundary lubrication region gets less, which means the lubrication properties are relatively better. At last, the parametric study on mixed thermal elastohydrodynamic lubrication properties during shut-down has been carried out. It is found that the small bearing curve coefficient and increasing ball number can reduce the boundary lubrication time and improve the bearing lubrication.

Optimising lubricated friction coefficient by surface texturing

2013 ◽  
Vol 227 (11) ◽  
pp. 2610-2619 ◽  
Author(s):  
E de la Guerra Ochoa ◽  
J Echávarri Otero ◽  
E Chacón Tanarro ◽  
P Lafont Morgado ◽  
A Díaz Lantada ◽  
...  
Keyword(s):  
Experimental Data ◽  
Friction Coefficient ◽  
Chemical Etching ◽  
Surface Texturing ◽  
Point Contact ◽  
High Load ◽  
Operating Conditions ◽  
Textured Surface ◽  
Lubrication Regimes ◽  
Texture Size

Surface texturing has proved to be a very useful tool for expanding the behaviour under hydrodynamic and elastohydrodynamic regimes instead of mixed or boundary lubrication regimes, and therefore for reducing the friction coefficient under high-load low-speed conditions. This article presents the texturing of different copper test-samples using photolithography and chemical etching to measure the friction coefficient using a point contact machine. The effects of texture size, texturing density, the initial roughness of the samples and the operating conditions have all been studied. Some combinations of texturing density and texture size achieve up to 30% reduction in the friction coefficient. Taking into account experimental data, artificial neural networks are used as a tool for both predicting and optimising the friction coefficient on the textured surface for any given operating condition.

Friction and Wear Behavior of Textured Al2O3/TiC Ceramic Surface Filled with MoS2 Solid Lubricants

2012 ◽  
Vol 229-231 ◽  
pp. 35-39 ◽  
Author(s):  
You Qiang Xing ◽  
Jian Xin Deng ◽  
Ze Wu ◽  
Yun Song Lian
Keyword(s):  
Friction Coefficient ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Solid Lubricants ◽  
Laser Surface Texturing ◽  
Textured Surface ◽  
Ceramic Surface ◽  
Textured Surfaces ◽  
Wear Properties ◽  
Wear Rates

Three different textures were produced by Laser Surface Texturing (LST) on Al2O3/TiC ceramic surfaces. MoS2 solid lubricants were filled into the textures. The friction and wear properties of textured and untextured surfaces were investigated by carrying out sliding tests against AISI440C stainless steel balls. Results showed that the textured surfaces filled with MoS2 solid lubricants exhibited lower friction coefficient and excellent anti-wear properties compared with untextured surfaces. At the texture spacing of 100μm, 150μm and 200μm, wavy textured surface had the lowest friction coefficient, while it was the dimpled surface at the texture spacing of 250μm. MoS2 film in the spaces between the textures was formed by mechanical engagement of particles in the rough surfaces and solid lubricants in textures. The friction coefficient and wear rates were reduced by supply of solid lubricants from the textures to the surfaces, bulges around the textures and TiO2 formed after laser texturing.

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