Research On The Cylindrical Cup By Hydrodynamic Deep Drawing Based On Numerical Simulation

With the requirement of special material ,performance and accuracy in workpiece. Traditional technology can not meet the requirement in forming process. The hydrodynamic deep drawing (HDD) process is a flexible technology to meet the demand and developing of it .The hydrodynamic deep drawing (HDD) process is one of the effective methods to increase the forming limitation and reduce the forming steps of the aluminum-magnesium alloy and other low plasticity, poor formability sheets, because of the super flexibility, better qualification and low cost. With the development in forming equipment and controlling technology , The hydrodynamic deep drawing (HDD) process will be pay more attention in other industry place, it will have a bright future .In the hydroforming process, the forming conditions will give more impact on the forming material, and each parameter has a variety of combinations, the parameters in process is difficult to determine. In traditional identification , specific technology components required for hydroforming process parameters using methods of trial and error which was cumbersome and uneconomical. With the development in computer software and hardware technology, graphics technology, sheet metal plastic deformation theory and numerical methods .It creates a numerical simulation analysis by use of CAE technology in designing forming process in the new areas.In this paper, satisfying the forming need of aluminum alloy and other low plasticity materials, the HDD with independent radial hydraulic pressure was proposed. Employing the dynamic explicit analytical software ETA/Dynaform5.5 which is based on LS-DYNA3D, aiming at the HDD with independent radial hydraulic pressure of the aluminum alloy cylindrical cup (5A06), the effects of different independent radial hydraulic pressure and chamber pressure loading paths on the sheet-thickness distribution, For the particular structure of cylindrical cup,wrinkle and crack were analyzed by numerical simulation. The reasonable match relation of liquid chamber pressure and independent radial hydraulic pressure was obtained. And the effects of the parameters of sheet, mould and friction coefficient on the forming have been concluded. We got the reasonable match relation of liquid chamber pressure and independent radial hydraulic pressure. The effects of different radial pressure loading paths on the forming quality were investigated by taking the final wall-thickness distribution of the hemispherical bottom cylindrical cup as standard. The numerical simulation results indicated that the reasonable match of liquid chamber pressure and independent radial hydraulic pressure could reduce the thinning of the part effectively and can be a molding The conical parts of the aluminum-magnesium alloy of high-quality deep-drawing in ratio 2.2 in order to decrease the radial stress-strain and improve the drawing limitation of aluminum alloy cylindrical cup.