研究目的
To improve the bending efficiency of thin-sheet-metal micro parts by optimizing scanning velocity and scanning pitch in femtosecond laser peen forming, aiming for smaller radius of curvature without significant sheet thickness reduction.
研究成果
Optimizing scanning velocity and pitch in femtosecond laser peen forming significantly improves bending efficiency, enabling a 40% smaller radius of curvature without increasing irradiated pulse density. This advancement is crucial for miniaturizing micro parts and enhancing productivity while maintaining part strength.
研究不足
The study was limited to pure titanium sheets of a specific thickness (50 μm) and may not directly apply to other materials or thicknesses without further research. The optimization of scanning conditions was based on a specific set of parameters, and the generalizability of the findings to other laser systems or materials requires validation.
1：Experimental Design and Method Selection:
The study utilized femtosecond laser peen forming, a die-less incremental sheet forming method using laser-induced shock waves. The experiment focused on optimizing scanning conditions (velocity and pitch) to improve bending efficiency.
2：Sample Selection and Data Sources:
Pure titanium sheets (JIS Grade I, 240HV) of thickness 50 μm were used as workpieces. The sheets were cut into strips of 5 mm width and 30 mm length.
3：List of Experimental Equipment and Materials:
A femtosecond laser with specifications including wave length of 800 nm, pulse duration of 80 fs, pulse frequency of 1 Hz - 1 kHz, and pulse energy ≤ 350 μJ was used. A 35 mm focal length lens focused the laser on the target surface.
4：Experimental Procedures and Operational Workflow:
The laser scanning was performed by moving a three-axis motorized stage with the workpiece mounted. The scanning area's length was varied, and the bend angle was measured post-irradiation with a profile projector.
5：Data Analysis Methods:
The bend angle and radius of curvature were calculated and analyzed to evaluate the bending efficiency under different scanning conditions.
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