Sheet Hydroforming Of Numerical Simulation And Formability Prediction Model

Hydroforming has two fashions, one is that liquid replaces punch, two is that liquid replaces die. In this paper, research the former. Because of simple mould and suit to complex shape, a little of batch part, the technics has many virtues. But due to the complication of its forming mechanism, it is necessary to trial and tests frequently in the past, obtained technology parameters of a concrete part. In recent years, with the development of FEM technology, the numerical simulation method is also been a analysis tool for hydroforming process.In this paper, how to realize the computer simulation of the hydroforming process is mostly introduced and the effects of technology important parameters are illuminated by simulating. An experiment for hydroforming is made out. the coincidence of results from experimental and simulation calculation verifies the reliability of the simulation. Furthermore, two typical examples that they are half ball part and complex cavity((motorcycle oil) are taken. About the former, the distribution of the thickness is analyzed. The deformation law of the sheet parts during hydroforming had been researched. About the latter, through numerical simulation, the key parameters effecting hydroforming, liquid pressure and blank holdeing force, are calculated. stress and strain distribution during hydroforming is analyzed and places where wrinkling and rupture may occur are predicted. Furthermore, the reasons for wrinkling at corners are investigated. Numerical simulation is also applied for hydorfoming of complicated-box shaped parts with draw beads. The results indicated that appropriate draw beads reasonably distributing the flow resistance on area of flange, which contributes to eliminate the wrinkling possibility at corners.Finally, in this paper a forecast model about blank forming result which based on artificial neural network is provided. The forecast model has three three-layer BP network structure and forecast blank forming result. It is a new thought for determining blank forming result. The model reduces the amounts of computer...