Numerical Simulation And Experimental Study On Laser Shock And Multi-point Compound Forming For Sheet Metal

A novel sheet metal plastic forming technology-laser shock and Multi-point compound forming (LMF) was proposed in this paper. The primary process and mechanism of LMF were studied in details, and then it would greatly emphasized on studying the two parts’numerical simulations-laser shock profile modeling (LSPM) and pre-stress laser shock forming (LSF). and the experiments of pre-stress LSF were studied. The main contents of this paper are showed as following:The forming process of LMF was studied, and the deformation mechanism and mechanical effect of sheet metal by laser shockwave were analyzed. The effects of multi-point die and polyurethane elastic cushion in LMF were discussed, and the deformation of LMF was also analyzed.Finite element method (FEM) was applied to the investigation of the LMF process. The simulation process was designed based on the ABAQUS software. Some key technical issues in simulations were studied and solved and then the appropriate analysis model for the FE simulation of LMF was established with ABAQUS code.The main influencing factors of LSPM were investigated. The process parameters were optimized by using MINITAB code and orthogonal design of experiments (DOE) for simulations. The groove profiles were simulated by the optimal process parameters, and then the simulation results were analyzed.The procedure of pre-stress LSF was developed. Quasi-static analysis method was used in pre-forming step, and the key technical issues of the loading rate and load were solved in quasi-static analysis. During laser shockwave loading step, the data of pre-forming step were used as the initial data. The deformation contour and springback of sheet metal by different process parameters in FE simulation were investigated.The pre-stress LSF experiments of SUS304 stainless steel were performed to validate the simulation results. By measuring the deformation contour of sheet metal, the experiment data were compared with the simulated results. The results showed that simulated results were basically in agreement with the experiment data.