Research On The Technology Of High-pressure Water Jet Incremental Forming

As the rapid movement of the market environment and the development of the times, people's desire for their products'individuation increases rapidly, the requirement of consumers is becoming more and more principle, and various. The updating of the products is more and more quickly, the customization of the product fashion is growing up. So all of these need manufacturing continue to open out new product to meet people's need. And these new products must be made quickly so that they can occupy the market quickly.In such a situation, the water jet incremental forming technology gradually takes shape. Traditional sheet metal forming method uses two dies; it has a broad serviceability, high production efficiency and is suitable for mass production. So for many years, this method dominates the sheet metal forming industry. But this method needs dies, it takes a long time to design and manufacture the dies, and the cost for the dies'material and manufacture is high, so it can not meet the need of the market, such as variety and small batch. The water jet incremental forming technology overcomes the disadvantage of die, saving the cost and period of the production, especially adapt to the research of new products and small production. Water Jet Incremental Sheet Metal Forming (WJISMF) bases on the computer technology, numerical control technology, material forming technology and water jet technology. It adopt the idea of the delimitation produce to scatter a complex 3D shape to many 2D layers along Z axis, and then the water jet machine partially on these layers. The water come through the high pressure pump and pass through the muzzle to become high pressure water jet, ejecting on the material sheet, when the pressure reach to the degree, the sheet will distortion, under the control of the CNC, the jet will move along the fixed path, so one layer is made, after that the water jet descend along the Z axis to shape next one, cycle as these till to the end.This paper is directed against water jet incremental forming technology for analysis. Mainly from the water jet forming principle of gradual shaping, forming deformation, forming Construction equipment, as well as optimization of path, and so were introduced.⑴Principle of Water jet incremental formingForming pressure water jet can be seen as a single point of incremental forming, a single point of incremental forming technology is based on rapid prototyping technology "LOM" and the development of a new model without forming sheet metal processing technology, which directly processed Shell Parts, and because the processing of sheet metal partial pressure, the accumulation of continuous deformation to achieve overall forming, and high precision machining parts, the technology is a promising advanced manufacturing technologies.⑵The calculation of forming deformationIn the water Jet incremental forming, there is a complex elastic-plastic deformation phenomenon and a number of different factors, so that the existing elastic-plastic deformation of the basic theory of forming calculated it is very difficult to obtain accurate results. Therefore, in this study there are some of the basic assumptions on the calculation of forming, and choice of some main factors. Then make a model of stress and strain, and using hierarchical thinking to calculation the forming volume.⑶Construction forming equipmentIn this experiment, as forming pressure water jet technology in the R & D state, many things still in the state of theory, processing equipment is simple designed in this experiment. It mainly uses a high-pressure piston pump to get the necessary high pressure. In this experiment, the high-voltage equipment converts form washing machine. At the same time, we also have a brief introduction about the pressure of the water jet control system in this study.⑷Optimization of path in the ProcessThe path of water jet incremental sheet metal forming to be generated and optimized. Jet incremental forming in the water, the path is mainly generated by CAD / CAM software generation, but the use of software generated can not be directly used for the production path processing, it is also necessary to be optimized. In this paper, using distributing the pressure points of pressure head uniformly to its optimum. In addition, the paper also studies the use of genetic algorithms on forming path planning to optimize them.