| Laser adjustment of sheet metal is an advanced flexible correctional method that has been put forward in recent years. The process utilizes the thermal stress induced by laser irradiation to adjust distorted sheet metal to the initial shape. There are many advantages such as no need of mould, nonexistence of outer forces, condensed laser energy and good controllability. So laser adjustment is a promising technology in manufacturing, such as in the automobile, shipbuilding, and microelectronic industries and so on.3D finite element models are set up in the paper for the temperature field and displacement field of laser adjustment of metal sheet with the theories of elastic-plastic deformation and nonlinear transient heat transfer. The simulation analytic process is carried out by using popular software ANSYS, which is used to set up the models of mechanical deforming sheet metal and thermal deforming sheet metal . The temperature field, displacement field and strain-stress field of 1Cr18Ni9 in laser adjustment is obtained. Some rules are summarized and the mechanism is analyzed according to the simulated results.There are many factors to affect the correction of this process, so plenty of experiments are carried out to reveal the deformation principles of laser adjustment of metal sheet. As for mechanical deforming sheet metal and thermal deforming sheet metal, the experiments which research the influence of different processing parameters on adjusting angle, using orthogonal method ,single factor method and P/VD method in this paper. The optimized parameters with maximal adjusting angle are obtained, and the influencing principles and factors of laser adjustment are then presented. Many experiments are carried out to research the miniature angle and large angel adjustment. The transformation of the material microstructure in the heating area is also analyzed in this paper. |
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