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Improving the Forming Quality of Laser Dynamic Flexible Micropunching by Laser Pre-Shocking
Jindian Zhang1, Zongbao Shen1,2,3, Youyu Lin3
1School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China.
Materials (Basel, Switzerland)
|August 23, 2020
Summary
Laser pre-shocking (LPS) refines grain size in laser dynamic flexible micropunching, improving workpiece forming quality. This method enhances surface roughness, fracture surface integrity, and dimensional accuracy, especially for coarse-grained materials.
Area of Science:
- Materials Science
- Manufacturing Engineering
- Surface Engineering
Background:
- Laser dynamic flexible micropunching is a precision manufacturing process.
- Grain size significantly influences the mechanical properties and forming quality of materials.
- Improving the surface finish and dimensional accuracy of punched parts is crucial.
Purpose of the Study:
- To investigate the effect of laser pre-shocking (LPS) on grain refinement and forming quality in laser dynamic flexible micropunching.
- To evaluate the impact of LPS on surface roughness, fracture surface characteristics, and dimensional accuracy of T2 copper foils.
- To determine the optimal conditions for LPS application in micropunching processes.
Main Methods:
- Experimentation with T2 copper foils of varying grain sizes.
- Application of laser dynamic flexible micropunching with and without LPS.
- Systematic variation of laser power densities.
- Measurement of average surface roughness (Ra) and analysis of fracture surfaces.
- Assessment of dimensional and shape accuracy of punched holes.
Main Results:
- LPS effectively refines grain size, leading to a decrease in average surface roughness (Ra). For instance, Ra decreased from 0.430 to 0.363 µm for copper foils annealed at 650 °C.
- Increased laser energy density and initial grain size generally led to poorer fracture surface quality, an effect mitigated by LPS.
- LPS significantly improved the dimensional and shape accuracy of punched holes compared to conventional methods.
- The forming quality became uncertain when grain size approached foil thickness due to grain orientation variations, but LPS stabilized this.
- The benefits of LPS were particularly pronounced for copper foils with larger, coarser grains.
Conclusions:
- Laser pre-shocking is an effective technique for refining grain size and enhancing the forming quality in laser dynamic flexible micropunching.
- LPS improves surface finish, fracture characteristics, and dimensional precision of punched components, especially beneficial for coarse-grained materials.
- The application of LPS contributes to process stability and reduces uncertainty in micropunching, particularly when dealing with materials with significant grain size variations.
