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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.

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|July 8, 2023
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Summary
This summary is machine-generated.

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.

Keywords:
NdFeBlaser processingmelt pool flow evolutionmicrostructure formation mechanismsimulation

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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.