The Tribological Behavior of Cast Iron by Laser Surface Texturing under Oil-Lubricated Initial Line Contact for Rotary Compressor
Abstract
:1. Introduction
2. Tribological Experiments
2.1. Samples
2.2. Testing Parameters
3. Results and Discussion
3.1. Friction Characteristics
3.2. Wear Performances
4. Conclusions
- (1)
- The tribological improvement brought about by textured surfaces strongly depends on the contact form. For the oil-lubricated initial line contact in this study, the textured surface showed better frictional advantage with a lower friction coefficient and slower temperature rise. The advantage gradually expanded with the increase in the applied load. The friction coefficients on the textured surface were 11~64% lower than the friction coefficients on the untextured one. However, the textured surface deteriorated in terms of the wear behavior with a greater wear depth and width; namely, the laser surface texturing (LST) did not improve the wear resistance.
- (2)
- The textured micro-dimples generated a hydrodynamic effect to enhance the load-carrying capacity of the oil film and increase the film thickness, thus reducing the friction coefficient. However, the coupling effect between the material deformations of counter surface and the micro-cutting effect of the texture edges generated repetitive cutting wear between the textured region and its counter region, which caused more severe wear loss than for the untextured one. The abrasive wear and fatigue wear were the dominant wear mechanisms.
- (3)
- Differing from wide applications in face contact, for the initial line contact, laser surface texturing has the potential to reduce the friction power consumption in refrigeration and air-conditioning compressors. But it needs to avoid direct contact and collision with the high applied load between friction pairs for material reliability and durability. The coupling processing of the textured surface and a protective surface coating is an important way to keep the friction reduction and improve the wear resistance.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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No. | Designed Depth/μm | Dimple Diameter/mm | Dimple Area Density | Dimple Numbers | Dimple Patterns | ||
---|---|---|---|---|---|---|---|
Major | Minor | x-Direction | y-Direction | ||||
1# | -- | -- | -- | -- | -- | -- | Untextured |
2# | 6.0 | 0.4 | 0.2 | 10.36% | 15 | 11 | Ellipse |
Specimen Numbers | Test 1# | Test 2# | Test 3# | Average Value |
---|---|---|---|---|
No. 1# | 0.136 | 0.127 | 0.138 | 0.134 |
No. 2# | 0.139 | 0.143 | 0.128 | 0.137 |
No. 3# | 0.122 | 0.135 | 0.133 | 0.130 |
No. 4# | 0.130 | 0.121 | 0.127 | 0.126 |
No. 5# | 0.114 | 0.138 | 0.129 | 0.127 |
Item | Symbol | Dimensions and Data |
---|---|---|
Rotational speed | ω | 1000 rpm |
Applied load | W | 356, 445, 556, 667, 778, 889 N |
Running time | t | 3600 s |
Lubrication condition | / | oil lubrication with 100 mL |
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Ding, S.; Hu, Y.; Wei, H.; Mu, D.; Zhan, X.; Wang, J.; Yang, O.; Xu, J. The Tribological Behavior of Cast Iron by Laser Surface Texturing under Oil-Lubricated Initial Line Contact for Rotary Compressor. Lubricants 2023, 11, 486. https://doi.org/10.3390/lubricants11110486
Ding S, Hu Y, Wei H, Mu D, Zhan X, Wang J, Yang O, Xu J. The Tribological Behavior of Cast Iron by Laser Surface Texturing under Oil-Lubricated Initial Line Contact for Rotary Compressor. Lubricants. 2023; 11(11):486. https://doi.org/10.3390/lubricants11110486
Chicago/Turabian StyleDing, Shaopeng, Yusheng Hu, Huijun Wei, Di Mu, Xiangzhi Zhan, Jun Wang, Ouxiang Yang, and Jia Xu. 2023. "The Tribological Behavior of Cast Iron by Laser Surface Texturing under Oil-Lubricated Initial Line Contact for Rotary Compressor" Lubricants 11, no. 11: 486. https://doi.org/10.3390/lubricants11110486