Non-Thermal Laser Stretch-Forming
Non-Thermal Laser Stretch-Forming
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DOI：
10.4028/www.scientific.net/amr.6-8.433
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发表时间：
2005-05
期刊：
影响因子：
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通讯作者：
H. Schulze Niehoff;F. Vollertsen
中科院分区：
文献类型：
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作者：
H. Schulze Niehoff;F. Vollertsen
本文介绍了一种新的薄板拉形工艺。这项新技术基于冲击波作为成形能量的来源，通过激光脉冲产生。初步实验结果表明，激光脉冲拉伸成形是可行的。利用准分子激光脉冲，研究了离焦量、功率密度、脉冲能量、脉冲数和材料等参数对激光功率密度的影响。结果表明，可以生产出直径为1.4 mm、圆顶高度超过250 µm的均匀形状圆顶。最近的研究表明，通过使用TEA-CO2激光器可以达到更好的结果，因为不需要限制，避免了表面的烧蚀。在表面处没有烧蚀使得这种新技术更加有趣，因为不仅表面保持精确，而且因为可以在一个点处施加多个脉冲，因此可以在不增加功率密度的情况下达到更高的成形程度。
A new process technology for stretch-forming of thin sheet metals is presented within this paper. This new technology is based on shock waves as a source for the forming energy, which are created through laser pulses. The results of some preliminary experiments show, that stretchforming with laser pulses is possible. The influence of parameters like defocussing, power density, pulse energy, number of pulses and material are worked out with excimer-laser pulses. The results show, that uniform shaped domes with a dome height over 250 µm with diameters of 1.4 mm could be produced. More recent studies show that even better results can be reached through the use of TEA-CO2-Lasers, since no confinement is needed and ablation at the surface is avoided. The absence of ablation at the surface makes this new technology even more interesting, since not only the surface remains accurate, but also since several pulses can be applied at one point and thus higher forming degrees can be reached without increasing the power density.