| WANG Ben,SHI Zhong'ao,ZHU Tianlong,ZHANG Qi.Wear Mechanism of SiC Particles of Different Sizes on Machine Tool Guide Material GCr15[J],54(1):140-149 |
| Wear Mechanism of SiC Particles of Different Sizes on Machine Tool Guide Material GCr15 |
| Received:December 29, 2023 Revised:March 14, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.01.013 |
| KeyWord:machine guideway pin-disc test three body abrasive wear friction and wear properties wear mechanism |
| Author | Institution |
| WANG Ben |
College of Mechanical and Electrical Engineering, Shenyang Aerospace University, Shenyang 11000, China |
| SHI Zhong'ao |
College of Mechanical and Electrical Engineering, Shenyang Aerospace University, Shenyang 11000, China |
| ZHU Tianlong |
College of Mechanical and Electrical Engineering, Shenyang Aerospace University, Shenyang 11000, China |
| ZHANG Qi |
College of Mechanical and Electrical Engineering, Shenyang Aerospace University, Shenyang 11000, China |
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| Abstract: |
| The work aims to investigate the effect mechanism and wear mechanism of SiCf/SiC ceramic matrix composite chips with different geometric dimensions on the wear performance of machine tool precision parts and provide theoretical reference for machine tool protection. With the guide rail moving part of machine tool precision parts as an example, SiC abrasive particles were adopted instead of SiCf/SiC ceramic matrix composite chips, and the GCr15 bearing steel commonly used as the material of the guide rail moving part of the machine tool was used to conduct the friction and wear experiments on the pin and disc under the condition of abrasive particles of different geometric dimensions, and the macroscopic coefficient of friction and microscopic wear morphology was used to characterize the worn surface and investigate the wear mechanism. The coefficient of friction was stable in the absence of abrasive particles, showing a tendency to increase, decrease, stabilize and then increase again. Compared to the condition without abrasive particles, the addition of abrasive particles produced higher and more unstable coefficients of friction. The overall trend of the friction coefficients remained unchanged, although unstable fluctuations occurred between the 1 μm and 5 μm abrasive particle conditions, while the friction coefficients under the 10 μm and 20 μm grain conditions continued to increase instead of decreasing after the first increase, and under the 20 μm condition, the second increase in the friction coefficient occurred in advance. There were obvious parallel grooves accompanied by a small number of spalling pits on the wear surface of GCr15 bearing steel under both non-abrasive and abrasive grit conditions. However, there were a large number of irregular indentations on the wear surface under the abrasive grit condition. In addition, with the increase of abrasive grain size, the wear of grooves and indentations on the test surfaces was more severe, and the spalling pits of the surface material were more intensive, while the deeper depth of wear marks as well as the higher amount of wear was produced under the high geometric abrasive grain condition. There were two forms of motion of abrasive grains at the friction interface, free and bonded, and the wear mechanism was characterized by large abrasive grains bonded to the friction interface, resulting in sliding grooves, and small abrasive grains free in the grooves, where rolling and extrusion occurred. As a result, the wear mechanism is a combination of rolling extrusion wear and sliding groove wear, and as the grain geometry increases, the wear mechanism changes from rolling extrusion to sliding groove dominance. The addition of abrasive particles causes unstable wear, and the wear process can be divided into three stages:running-in wear, stable wear and heavy wear. 1 μm and 5 μm abrasive particles mainly affect the running-in process in the severe wear stage, while 10 μm and 20 μm abrasive particles have an obvious effect on the whole process, and the addition of large-sized abrasive particles accelerates the friction process. Through the comparison on the wear morphology, coefficient of friction and amount of wear under different conditions, the effect of 1 μm and 5 μm abrasive particles on friction is relatively small. |
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