研究目的
To identify parameters of influence in high aspect ratio drilling and cutting of stainless steel with ultrashort pulses, focusing on trepanning drilling and zero-taper cutting techniques.
研究成果
The engineering model accurately estimates taper angle and process time for ultrafast laser ablation, enabling better process control and optimization for industrial applications like drilling and zero-taper cutting.
研究不足
The model does not account for multiple optical reflections inside machined grooves or heat accumulation effects at high repetition rates, which may affect ablation efficiency and quality.
1：Experimental Design and Method Selection:
The study uses an engineering model based on the two-temperature description of ultra-fast ablation, applying it to trepanning drilling and zero-taper cutting with oblique laser beams.
2：Sample Selection and Data Sources:
Stainless steel samples are used, with line ablation experiments conducted to understand wall conicity control.
3：List of Experimental Equipment and Materials:
A 100W femtosecond laser, 3x-beam expander, 2-axis galvo head, 100 mm-f(θ) focusing lens, XYZ-motorized stages, and a sample holder capable of tilting.
4：Experimental Procedures and Operational Workflow:
The setup includes laser ablation with varying beam angles, pulse energies, and repetition rates to study effects on groove profiles and conicity.
5：Data Analysis Methods:
Groove profiles are measured using confocal microscopy and conventional microscopy for deeper cuts, with model parameters adjusted to fit experimental data.
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