Research on Process of Multi-point Micro Laser Shock Forming

Abstract

Abstract:In order to study deformation feature of multi-point micro laser shock forming and distribution of impact surface morphology, single pass with multi-point forming experiments on copper T2 were conducted with Spitlight Nd: YAG laser ; Typical paths were introduced to characterize forming shape and distribution of impact surface morphology; Influence law of process parameters on micro laser shock forming was discussed. The results show that laser energy, overlapping rate and laser spot diameter are the main influence factors on impact deformation and surface morphology; Deformation and surface roughness increase with increment of laser energy. With the increase of the laser energy, the maximal deformation of metal sheet increases from 344.6 μm to 527.3 μm, and the surface waviness of the Path1, path2 and path3 were increased by 38.8%,47.37% and 75.41%. When the overlapping rate increases from 0%to 50%, the maximal deformation of metal sheet increases from 344.6 μm to564.6 μm, and the waviness on the path of path1,path2 and path3 are reduced by 9.46%、6.37%、9.81%. The higher the lapping rate is , the better the surface smoothness is. When the light spot diameter increases from 1 mm to 1.8 mm, the deformation of metal sheet gradually becomes smaller ,and the waviness on the path of path1,path2 and path3 are reduced by 44.22%、47.03%、55.1% .The larger the light spot diameter is, the better the surface smoothness is. It provides good guidance for the selection of process parameters in micro laser shock forming and surface quality control by the analysis and reasonable characterization.