Abstract
Laser leveling is an application of laser forming. Laser leveling of a sheet metal is a plastic process caused by thermal stresses which are produced in the sheet by laser irradiation. In this paper, a sphereical distortion on a sheet metal is leveled by laser irradiation. As a model of a circular distortion, the dsitortion is intentionally introduced on the sheet metal by pressing a steel ball of 25 mm radius against it. As work materials, steel sheet and stainless steel sheet whose thickness is 0.6mm are used. Laser beam is radially irradiated at the center of circular distortion for leveling the distorted sheet metal. Continuous CO2 laser beam is used and its power is changed at the range of 80W ∼ 200W under a constant scanning speed of 2mm/s. After laser irradiation, a distortion of about 400µm hight becomes almost flat without melting a sheet metal.
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