Abstract
To study the lubrication and wear reduction characteristics of the QAL9-4 and 17-4pH textured friction pair during water lubrication, the dynamic pressure bearing and cavitation characteristics were analyzed using a computational fluid dynamics method. Then, based on 13 groups of samples with different depths, diameters, and area ratios, relevant frictional and wear tests were carried out. The results showed that the texture affected the pressure distribution in the textured region and improved the liquid film bearing capacity, which increased gradually as the equivalent Reynolds number increased. Under test conditions, the texture parameters had a significant influence on lubrication and wear reduction performance. The optimum texture diameter, the depth, and the area ratio were 300 µm, 40 µm, and 10%, respectively. The wear tracks on the textured specimens were small in size and shallow in depth compared to those on the non-textured specimens. The wear tracks on the textured specimens were regional, and there were more wear tracks in the area without micro-dimples. In summary, it was feasible to apply surface texture to the QAL9-4 and 17-4PH friction pair to improve the lubrication and wear reduction characteristics with water lubrication.
Highlights
Most underground coal mine support equipment, installation equipment, transportation equipment, and operation tools use emulsions as their working media
Based on the results of this study, the following conclusions were obtained: (1) The friction coefficient of the QAL9-4 and 17-4PH textured pair increased with decreasing load, while it increased gradually with increasing texture depth, and it initially decreased and increased with increasing texture diameter and area ratio
When the texture depth was increased to 70 μm, the wear resistance effects began to appear, and the increase rates were
Summary
Most underground coal mine support equipment, installation equipment, transportation equipment, and operation tools use emulsions as their working media. Surface texture is a new technique used to improve the surface properties of a friction pair It can increase the bearing capacity of the water film, improve secondary lubrication, reduce friction and wear, and capture micro-abrasive particles.. It can increase the bearing capacity of the water film, improve secondary lubrication, reduce friction and wear, and capture micro-abrasive particles.8–10 These functions are very suitable for the anti-wear of the friction pairs of water hydraulic components in coal mines. This study took a representative friction pair (i.e., QAL94 and 17-4PH), which is widely used in water hydraulic coal mining equipment, as the research object to carry out texture lubrication and wear reduction research. This research provided a new idea for drag reduction and the anti-wear of water hydraulic components in coal mining equipment under high pollution conditions, and it had important implications for research
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