Microanalysis of Worn Surfaces of Selected Rotating Parts of an Internal Combustion Engine
The present paper analyzes the damage of surfaces at spots of frictional contact, namely, the friction nodes on a camshaft and the connecting rod pins of a crankshaft. The resulting wear of the monitored friction nodes reduces the technical life of the machines, which can lead to the decommissioning...
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| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/1/158 |
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| author | Rastislav Bernát Jozef Žarnovský Ivan Kováč Rastislav Mikuš Jiří Fries Radoslav Csintalan |
| author_facet | Rastislav Bernát Jozef Žarnovský Ivan Kováč Rastislav Mikuš Jiří Fries Radoslav Csintalan |
| author_sort | Rastislav Bernát |
| collection | DOAJ |
| description | The present paper analyzes the damage of surfaces at spots of frictional contact, namely, the friction nodes on a camshaft and the connecting rod pins of a crankshaft. The resulting wear of the monitored friction nodes reduces the technical life of the machines, which can lead to the decommissioning of the machine. Wear was assessed by measuring roughness and microhardness and by observing the microstructures of the materials. The results of the experiments show that the rotating parts displayed visible wear on the cams, as well as on the connecting rod pins. The experiments revealed that wear was caused by the heating of the material to a high temperature during the operation of the machine and that there was a gradual cooling and tempering of the material, which led to a reduction in the microhardness of the monitored object. Lower microhardness values can be a cause of greater wear of the monitored objects. When comparing the microhardness of the used and the new camshaft, the hardened layer of the new camshaft from secondary production has a significantly smaller thickness compared to worn cams, which leads to the finding of a different material quality compared to the original parts from primary production. This fact indicates that the wear of a new camshaft as a spare part can contribute to the shortening of the technical life of friction nodes. |
| first_indexed | 2024-03-10T03:33:24Z |
| format | Article |
| id | doaj.art-05bdc8b661a24661a0e7b6beee2a190d |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T03:33:24Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-05bdc8b661a24661a0e7b6beee2a190d2023-11-23T11:49:00ZengMDPI AGMaterials1996-19442021-12-0115115810.3390/ma15010158Microanalysis of Worn Surfaces of Selected Rotating Parts of an Internal Combustion EngineRastislav Bernát0Jozef Žarnovský1Ivan Kováč2Rastislav Mikuš3Jiří Fries4Radoslav Csintalan5Faculty of Engineering, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 76 Nitra, SlovakiaFaculty of Engineering, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 76 Nitra, SlovakiaFaculty of Engineering, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 76 Nitra, SlovakiaFaculty of Engineering, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 76 Nitra, SlovakiaFaculty of Mechanical Engineering, Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava-Poruba, Czech RepublicFaculty of Engineering, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 76 Nitra, SlovakiaThe present paper analyzes the damage of surfaces at spots of frictional contact, namely, the friction nodes on a camshaft and the connecting rod pins of a crankshaft. The resulting wear of the monitored friction nodes reduces the technical life of the machines, which can lead to the decommissioning of the machine. Wear was assessed by measuring roughness and microhardness and by observing the microstructures of the materials. The results of the experiments show that the rotating parts displayed visible wear on the cams, as well as on the connecting rod pins. The experiments revealed that wear was caused by the heating of the material to a high temperature during the operation of the machine and that there was a gradual cooling and tempering of the material, which led to a reduction in the microhardness of the monitored object. Lower microhardness values can be a cause of greater wear of the monitored objects. When comparing the microhardness of the used and the new camshaft, the hardened layer of the new camshaft from secondary production has a significantly smaller thickness compared to worn cams, which leads to the finding of a different material quality compared to the original parts from primary production. This fact indicates that the wear of a new camshaft as a spare part can contribute to the shortening of the technical life of friction nodes.https://www.mdpi.com/1996-1944/15/1/158camcamshaftcrankshaftroughnessmicrohardness |
| spellingShingle | Rastislav Bernát Jozef Žarnovský Ivan Kováč Rastislav Mikuš Jiří Fries Radoslav Csintalan Microanalysis of Worn Surfaces of Selected Rotating Parts of an Internal Combustion Engine Materials cam camshaft crankshaft roughness microhardness |
| title | Microanalysis of Worn Surfaces of Selected Rotating Parts of an Internal Combustion Engine |
| title_full | Microanalysis of Worn Surfaces of Selected Rotating Parts of an Internal Combustion Engine |
| title_fullStr | Microanalysis of Worn Surfaces of Selected Rotating Parts of an Internal Combustion Engine |
| title_full_unstemmed | Microanalysis of Worn Surfaces of Selected Rotating Parts of an Internal Combustion Engine |
| title_short | Microanalysis of Worn Surfaces of Selected Rotating Parts of an Internal Combustion Engine |
| title_sort | microanalysis of worn surfaces of selected rotating parts of an internal combustion engine |
| topic | cam camshaft crankshaft roughness microhardness |
| url | https://www.mdpi.com/1996-1944/15/1/158 |
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