| YU Xiao-wen,YAO Zhe-he,ZHANG Cao-qi,XING Fei,YAO Jian-hua,NIE Yan-bin.Effects of Multi-dimensional High Frequency Vibration on Geometrical Morphology of Laser Cladding Forming[J],49(10):286-293 |
| Effects of Multi-dimensional High Frequency Vibration on Geometrical Morphology of Laser Cladding Forming |
| Received:December 11, 2019 Revised:October 20, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.10.033 |
| KeyWord:laser cladding multi-dimensional vibration geometrical morphology wetting angle porosity numerical simulation |
| Author | Institution |
| YU Xiao-wen |
1.a.Institute of Laser Advanced Manufacturing, b.Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Zhejiang University of Technology, Hangzhou , China |
| YAO Zhe-he |
1.a.Institute of Laser Advanced Manufacturing, b.Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Zhejiang University of Technology, Hangzhou , China; 2.Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, Zhejiang University, Hangzhou , China |
| ZHANG Cao-qi |
1.a.Institute of Laser Advanced Manufacturing, b.Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Zhejiang University of Technology, Hangzhou , China |
| XING Fei |
3.Nanjing Zhongke Raycham Laser Technology Co., Ltd, Nanjing , China |
| YAO Jian-hua |
1.a.Institute of Laser Advanced Manufacturing, b.Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Zhejiang University of Technology, Hangzhou , China |
| NIE Yan-bin |
1.a.Institute of Laser Advanced Manufacturing, b.Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Zhejiang University of Technology, Hangzhou , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to reveal the mechanisms of multi-dimensional vibration on the geometrical morphology of laser coating and the quality of multi-track lap forming for the shape control of the laser cladding process, so as to meet the development needs of laser surface modification and remanufacturing. Experimental studies on multi-dimensional vibration- assisted laser cladding of 316L were carried out. The cross-section morphology of single track and multi-track laser cladding layer was analyzed. Multi-dimensional vibration-assisted laser cladding forming model was established by multi-physics finite element analysis software to analyze the surface temperature gradient of cladding layer. The simulation results showed that after two-dimensional vibration was applied, the surface flow velocity of molten pool increased by 31.00%, the increase of the surface flow velocity promoted the outward expansion of the molten pool, the maximum temperature gradient reduced by 39.08% and the cross-section geometrical morphology of the laser single-track cladding coating changed significantly due to the change of temperature and velocity. The experimental results showed that the cladding height reduced by 18.97, 33.94, 44.50 μm under one-dimensional, two-dimensional and three-dimensional vibration, respectively, compared to non-vibration condition. In addition, the cladding width increased by 27.70, 36.90, 63.34 μm, respectively, while the wetting angle decreased by 23.42% at the highest. During the multi-track overlapping process, part of the overlapping area did not melt due to insufficient absorption of laser energy when the wetting angle increased to a certain threshold. The melted powders were difficult to completely fill the corner. Consequently, pores were generated at the bottom of the cladding layer during multi-track laser cladding, which reduced the forming quality. The application of multi-dimensional vibration in multi-track laser cladding reduced the incidence of porosity by reducing the wetting angle. The multi-dimensional vibration effectively improves the wettability of the cladding layer by affecting the temperature gradient, reduces the incidence of the pores of the cladding coating, and improves the forming quality of the cladding layer. |
| Close |
|
|
|