Precision Control And Finite Element Analysis Of Laser Bending Of Aluminum Alloy Sheet

Laser bending forming is a new technology of sheet metal forming. It has been a hot research field at home and abroad, and has great development prospects in the fields of automobile, ship, aviation and precision instrument. In this paper, the laser bending of aluminum alloy sheet is studied by the combination of real experiment and finite element simulation, and the BP neural network is introduced to predict and optimize the laser bending process parameters, Paper’s mainly completely work as follows:(1) Simulation of real experimental conditions, finite element modeling of aluminum alloy sheet and laser light source, Simulation and analysis of laser bending of aluminum alloy, the changes of temperature field, stress field and displacement field in the forming process are obtained. It is found that the end effect of temperature gradient in the edge of the plate leads to the non uniformity of the bending forming of the free end.(2) Based on the results of finite element analysis, using optical fiber laser processing center for basic experiment of laser bending process. From the main process parameters are studied, such as laser power, scanning speed, scanning frequency and scanning mode. Fixed finite element analysis results; The influence of various parameters on the bending angle of aluminum alloy sheet are analysis; The influence of laser processing parameters on the bending angle of thin plate is obtained, That is the bending angle increases first and then decreases with the increase of laser power; The influence of scanning speed is weak, and the angle decreases with the increase of scanning speed; The influence of scanning frequency is obvious, but after reaching a certain angle, it will not increase again; The effect of intermittent scanning is more obvious than that of continuous scanning.(3) Based on real experimental data, the nonlinear model of BP neural network is used to construct the bending angle, laser power, scanning speed and scanning times, the laser process parameters are predicted when the bending angle is determined. Verified by experiment, the error is within 9%, has certain directive significance to the thin plate bending forming.The research of this paper has some practical significance for the laser Aluminum Alloy sheet bending forming experiment.