Study on die-less multi-point laser shock forming of metal foils
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摘要: 为了解决金属箔材微拉深工艺中高昂的微型模具设计制造成本问题，采用无模具激光冲击微成形方法，对脉宽5ns、直径50μm的高重复频率激光光斑微冲击成形20μm厚T2铜箔进行了理论分析和实验验证。结果表明，在约束层没有破损的情况下，凹坑深度h、凹坑底平面直径L1和凹坑壁倾斜程度（L-L1）随着单脉冲能量E及光斑搭接率增加线性增大；激光扫描内外圆周顺序对凹坑深度没有影响，但会对凹坑底平面直径有影响，先扫描外圆周时会形成更大的凹坑底平面直径，无需模具，凹坑形貌是可控的。这一结果对激光无模微拉深渐进成形的进一步研究是有帮助的。Abstract: In order to solve the problem of high cost of micro mold design and manufacturing in metal foil micro deep drawing process, a die-less laser shock micro-forming method was used. A high repetition frequency laser with pulse width of 5ns and spot diameter of 50μm was shocked on the T2 copper foil with thickness of 20μm, and theoretical analysis and experimental verification were carried out. The results show that, when the confinement layer is not damaged, the pit depth h, the diameter of pit bottom L1 and the inclination of pit wall (L-L1) increase linearly with the increase of single pulse energy E and spot overlapping rate. The order of inner and outer circumference of laser scanning has no effect on the depth of pits. But it will affect the diameter of the bottom of the pit. When scanning the outer circumference firstly, a larger bottom diameter pit will be formed. The shape of the pit is controllable without die. The study is helpful to the further study on die-less laser micro drawing progressive forming.
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Keywords:
- laser technique /
- laser shock forming /
- experimental method /
- metal foils /
- die-less /
- progressive forming
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Figure 5. Relationship between single pulse energy E and pit depth h, plane diameter L1 and 2h/(L-L1)
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Figure 7. Schematic diagram of depth h and plane diameter L1 of the concave pit with the increase of energy
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Figure 8. Relationship between the overlap rate of the spot depth h, plane diameter L1 and 2h/(L-L1)
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Figure 9. Surface condition diagram of copper foil after laser shocking with different overlap rates of spot
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