Simulation and Experimental Study of Laser Processing NdFeB Microarray Structure

NdFeB materials are widely used in the manufacturing of micro-linear motor sliders due to their excellent permanent magnetic properties. However, there are many challenges in processing the slider with micro-structures on the surface, such as complicated steps and low efficiency. Laser processing is...

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Bibliographic Details
Published in:Micromachines (Basel) 2023-03, Vol.14 (4), p.808
Main Authors: Zhao, Yong, Wang, Shuo, Yu, Wenhui, Long, Pengyu, Zhang, Jinlong, Tian, Wentao, Gao, Fei, Jin, Zhuji, Zheng, Hongyu, Wang, Chunjin, Guo, Jiang
Format: Article
Language:English
Subjects:
Ablation
Arrays
Deformation
Electric motors
Experiments
Geometry
Heat transfer
Hydrophobic surfaces
Laser applications
Laser processing
Lasers
Machining
Magnetic properties
melt pool flow evolution
Melt pools
microstructure formation mechanism
Morphology
NdFeB
Phase transitions
Refluxing
Scanning
Simulation
Simulation models
Software
Stainless steel
Surface tension
Temperature distribution
Two dimensional models
Velocity
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Summary:NdFeB materials are widely used in the manufacturing of micro-linear motor sliders due to their excellent permanent magnetic properties. However, there are many challenges in processing the slider with micro-structures on the surface, such as complicated steps and low efficiency. Laser processing is expected to solve these problems, but few studies have been reported. Therefore, simulation and experiment studies in this area are of great significance. In this study, a two-dimensional simulation model of laser-processed NdFeB material was established. Based on the overall effects of surface tension, recoil pressure, and gravity, the temperature field distribution and morphological characteristics with laser processing were analyzed. The flow evolution in the melt pool was discussed, and the mechanism of microstructure formation was revealed. In addition, the effect of laser scanning speed and average power on machining morphology was investigated. The results show that at an average power of 8 W and a scanning speed of 100 mm/s, the simulated ablation depth is 43 μm, which is consistent with the experimental results. During the machining process, the molten material accumulated on the inner wall and the outlet of the crater after sputtering and refluxing, forming a V-shaped pit. The ablation depth decreases with the increment of the scanning speed, while the depth and length of the melt pool, along with the height of the recast layer, increase with the average power.
ISSN:2072-666X
2072-666X
DOI:10.3390/mi14040808