| GUO Chen-guang,HE Shun-zhi,YUE Hai-tao,ZHAI Jian-hua.Laser Additive Remanufacturing for Mining Sprocket Repair[J],50(5):78-86 |
| Laser Additive Remanufacturing for Mining Sprocket Repair |
| Received:May 16, 2020 Revised:July 31, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.05.007 |
| KeyWord:sprocket laser additive remanufacturing wear domain reconstruction complex surface modeling performance analysis |
| Author | Institution |
| GUO Chen-guang |
Liaoning Technical University, Fuxin , China;Liaoning Provincial Key Laboratory of Large-scale Industrial and Mining Equipment, Fuxin , China |
| HE Shun-zhi |
Liaoning Technical University, Fuxin , China |
| YUE Hai-tao |
Liaoning Technical University, Fuxin , China |
| ZHAI Jian-hua |
Liaoning Technical University, Fuxin , China |
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| Abstract: |
| In order to improve the mechanical properties of worn sprockets and reduce the maintenance costs, the laser additive remanufacturing technology was used to study the repair process of the mining sprocket wear domain. In this paper, a scanner and the Imageware software were used to obtain and process the point cloud data of the sprocket blank respectively, and the reverse reconstruction method of wear domain was used for geometric modeling of wear chain socket, then the layering, path planning and trajectory code processing for the obtained model were performed. The morphology, hardness and tensile strength of the cladding test pieces were analyzed through the process tests, and finally the laser additive remanufacturing repair of the sprocket was carried out under the optimized laser processing parameters. 14 coordinate data from the reconstructed wear chain socket geometric model were selected to compare with the initial point cloud data, the maximum and minimum deviations were 0.26 mm and –0.05 mm, indicating that they were well matched. In the process tests, the performance analysis result of the cladding test pieces showed that the overall surface morphology of the test pieces were good, the microstructure of the cladding area was uniform and dense, the metallurgical bond between the fusion zone and the substrate was good, and the hardness of the cladding layer was significantly higher than that of the substrate. The cladding height and width were about 8000 μm and 23 000 μm respectively, which was consistent with the expected structure size. The hardness value of the remanufactured sprocket repair zone reached 50~56 HRC, the repair zone had no cracks and pore defects, and the cladding layer and the substrate showed good metallurgical bonding properties. The reconstructed geometric model of the chain socket wear area meets the requirements of remanufacturing processing accuracy. The use of laser additive remanufacturing repair technology can achieve a good metallurgical combination of the remanufactured cladding layer and the substrate, and strengthen and modify the surface hardness. The worn sprocket repaired by remanufacturing meets the performance requirements of underground working conditions, and has strong engineering application value. |
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