Numerical Simulation Analysis Of Rolling Process Of Magnesium/Aluminum Explosive Composite Plate

Magnesium alloy has the characteristics of light weight,high tensile strength,good shock absorption effect and abundant natural resources.The use prospect is very wide,but the poor corrosion resistance largely limits the application of magnesium alloy.Aluminum alloy has the characteristics of low density,good plasticity and strong corrosion resistance.Magnesium alloys and aluminum alloys are fabricated into a laminated composite material,which can fully utilize the advantages of aluminum alloy and magnesium alloy.The magnesium/aluminum laminated composite board can be prepared by the two methods of explosive welding-rolling,and the magnesium alloy sheet and the aluminum alloy sheet are tightly combined by the explosive welding process,and the magnesium/aluminum composite sheet is thinned by the rolling process.And improve the bonding strength of the magnesium/aluminum composite board.Therefore,in order to smoothly carry out the rolling process of the magnesium/aluminum explosive composite plate,it is necessary to design a reasonable rolling process parameter.In this paper,the ABAQUS finite element software is used to simulate the hot rolling process of AZ31 B magnesium alloy/5052 aluminum alloy explosive composite plate under different rolling speed,rolling temperature and rolling reduction,in order to determine the suitable rolling process parameters,to provide guidance for the actual rolling process.The main research contents of this paper are as follows:(1)Magnesium alloy plate and aluminum alloy plate are prepared by explosive process to form explosive composite plate,which is explosive for magnesium/aluminum.The microstructure and mechanical properties of the fried composite panel after annealing were determined,and the interface of the magnesium/aluminum explosive composite panel before rolling was determined to be good.(2)The ABAQUS finite element analysis software was used to establish the rolling process model of the magnesium/aluminum explosive composite panel.With the single factor control variable method,when the rolling temperature increases,the warpage curvature and the interface strain difference of the composite plate first increase and then decrease,while the magnesium alloy stress value remains basically unchanged.When the rolling reduction rate is increased,the warpage curvature and the interface strain difference of the composite sheet are all reduced,but the magnesium alloy stress value is gradually increased.When the rolling speed increases,the warpage curvature of the composite plate increases,and the interface strain difference first increases and then decreases.After the rolling,the stress value of the magnesium alloy increases first and then decreases with the increase of the rolling speed.Small trend.(3)The optimum rolling process parameters of the magnesium/aluminum explosive composite board were analyzed by orthogonal test: rolling reduction rate of 30%,rolling temperature of 350 °C,and rolling speed of 0.09 m/s.The simulation is carried out to analyze the temperature field of the composite plate under the optimum rolling process parameters.The composite plate has a minimum temperature of 112.5 ° C and a maximum temperature of 167.8 ° C.The surface stress of the stress field is relatively uniform,and the stress at the edge is large.(4)Experimental verification is carried out under the optimal rolling process parameters.Due to the limitation of experimental conditions,the rolls could not be heated and regulated,and the composite sheets showed delamination and tearing after rolling.In the subsequent rolling,it is necessary to select a rolling mill that can be heated and adjustable in speed,and a 1060 pure aluminum transition layer is added between the magnesium alloy sheet and the aluminum alloy sheet before the explosion.