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Simulation and Experimental Study of Laser Processing NdFeB Microarray Structure
Yong Zhao1, Shuo Wang1, Wenhui Yu2
1State Key Laboratory of High-Performance Precision Manufacturing, Dalian University of Technology, Dalian 116024, China.
Micromachines
|July 8, 2023
Summary
Laser processing offers an efficient method for creating micro-structures on Neodymium-Iron-Boron (NdFeB) magnetic sliders. This study simulates and validates laser parameters for optimal ablation depth and morphology, achieving a 43 μm depth.
Area of Science:
- Materials Science
- Manufacturing Engineering
- Laser Physics
Background:
- Neodymium-Iron-Boron (NdFeB) materials are crucial for micro-linear motor sliders due to their magnetic properties.
- Current manufacturing methods for micro-structured NdFeB sliders face challenges with complexity and efficiency.
- Laser processing presents a promising, yet under-explored, alternative for fabricating these components.
Purpose of the Study:
- To investigate the feasibility and optimize laser processing for micro-structured NdFeB materials.
- To analyze the thermal and fluid dynamics within the melt pool during laser ablation.
- To understand the mechanisms of microstructure formation and their dependence on processing parameters.
Main Methods:
- Development of a two-dimensional simulation model for laser-processed NdFeB.
- Analysis of temperature distribution, melt pool flow, and morphological characteristics.
- Experimental validation of simulation results, focusing on ablation depth and scanning speed effects.
Main Results:
- The simulation accurately predicted an ablation depth of 43 μm at 8 W average power and 100 mm/s scanning speed, matching experimental data.
- Molten material dynamics resulted in a V-shaped pit formation.
- Ablation depth is inversely related to scanning speed; melt pool dimensions and recast layer height increase with average laser power.
Conclusions:
- Laser processing is a viable technique for fabricating micro-structured NdFeB components.
- Optimized parameters (8 W, 100 mm/s) yield precise ablation depths.
- Understanding melt pool behavior is key to controlling microstructure formation and achieving desired surface morphology.
