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Takashi Ueda Yoshihiro WakimuraTatsuaki Furumoto Akira HosokawaRyutaro Tanaka 《Optics and Lasers in Engineering》2011,49(1):137-144
The purpose of this research is to establish the technique of laser flattening and to consider the fundamental mechanism. The thermal stress produced by heating with a laser beam is used to make a flat sheet from a sheet metal of protruded distortion. Three kinds of protrusions are chosen as the typical protruded distortion; point protrusion, line protrusion and face protrusion. For point protrusion, laser irradiation along the circular path is effective when the height of protrusion is large, and the laser irradiation along the radial path is effective when it is small. For line protrusion, laser beam is irradiated along the short straight path whose direction is normal to the centerline of the protrusion. For face protrusion, the height decreases from 1-0.1 mm by the laser irradiation along the circular path. The residual stress at the convex surface of a point protrusion on the sheet metal changes from a large compressive stress to a small tensile stress by the laser irradiation. 相似文献
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Effect of laser energy on the deformation behavior in microscale laser bulge forming 总被引:1,自引:0,他引:1
Microscale laser bulge forming is a high strain rate microforming method using high-amplitude shock wave pressure induced by pulsed laser irradiation. The process can serve as a rapidly established and high precision technique to impress microfeatures on thin sheet metals and holds promise of manufacturing complex miniaturized devices. The present paper investigated the forming process using both numerical and experimental methods. The effect of laser energy on microformability of pure copper was discussed in detail. A 3D measuring laser microscope was adopted to measure deformed regions under different laser energy levels. The deformation measurements showed that the experimental and numerical results were in good agreement. With the verified simulation model, the residual stress distribution at different laser energy was predicted and analyzed. The springback was found as a key factor to determine the distribution and magnitude of the compressive residual stress. In addition, the absorbent coating and the surface morphology of the formed samples were observed through the scanning electron microscope. The observation confirmed that the shock forming process was non-thermal attributed to the protection of the absorbent coating. 相似文献