Experiment Research On Laser Bending And Forming Of Aluminium

In modern manufacture, the plasticity curving and ramming forming technics of the pale and molding has been widely applied to such the manufactures as pressure vessel, the automobile, the ships, the flight vehicle outer covering and so on the large-scale steel work, as well as in all kinds of daily products. Traditionally it is through the exogenic power by the mould to realize curving formed craft. Because the cycle of mould design and manufacture is long, and the processing charge is high, so it is comparatively suitable for the mass production. But regarding to the manufacture of small batch and complex organization, the use of traditional formed craft inevitably causes the cost increase. Studying the non-mold flexibility forming theories and the techniques have the vital significance to reduce the new product development cost and cycle.Laser forming technology is a newer research technique, it can produce metalwork without any mechanical contact and mold. The study on laser bending-forming is still in starting phase, so the parameters of laser bending-forming (include laser parameter , sheet parameter, property of material etc.) still can't be controlled accurately. It is also a technique difficulty of laser bending-forming and the important impedimental factors to development of the technique that the inscrutability of forming results and the difficulty to select process parameters. Based on all these problems of laser bending-forming, the work includes the following contents:(l)According to research actuality about laser bending shape, experiment data and metallurgical structure about aluminium alloy are analyzed through lots of experimentation. Mechanism about bending shape is known deeply, and summarizes density of power about sample bending is 3.6316J. Base on density of power and light spot repetition, area of scan rate is calculated, it can make effect of scan become best.(2) Aiming at different laser parameters (including laser power, scan rate and light spot diameter), material parameters (material breadth and thickness) and material capability(material micro-hardness) affect bending angle. Bending angle about material augments along with laser power and laser light spot diameter augment, but bending angle about material minishes along with laser scan rate and material hardness augment. Bending angle augments along with material breadth augments, when augmenting a fixed value, bending angle does not change along with material dimension changing.(3) BP neural network is applied to laser bending forming, and MATLAB soft is applied to programming, forming results and machining parameters are predicted through numerical simulation, and BP neural network is trained by plenty of experimental data. On the base of the work above, better predicting results are obtained.In this paper, some key problems in laser bending forming are discussed, and effect of technological parameters (laser parameters, sheet metal parameters etc.) on the bending angle is conducted, and machining parameters and bending angle can be accurately predicted by using the trained BP neural network.