Research On Radial-reverse Composite Extrusion Process Of Magnesium Alloy Loading Wheels

With the development of modern war needs, lightweight has become thedevelopment trend of weapon equipment; and as the best lightweight material,magnesium alloys have received more and more attention. Loading wheel as the mainbearing component of armoured vehicle and its weight has accounted for four percentsof the armoured vehicle’s weight, to reduce the weight of the loading wheel can achievethe goal of lightweight. So this paper mainly studies the forming technology ofmagnesium alloys loading wheel of the armoured vehicle, combined with the thermalsimulation experiment and finite element numerical simulation to make the extrusionforming process and parameters of loading wheel. Finally, through the method ofexperimental test studying the forming of loading wheel of AZ80+RE magnesiumalloy. For subsequent mass production of magnesium alloy loading wheel providedtechnological referenceFirst of all，the hot deformation behavior of as-cast AZ80+RE magnesium alloywas studied by isothermal compression testing. The flow stress constitutive equation ofthe alloy was established and discovered dynamic recrystallization phenomenonappeared in the process of deformation. At the same time, the processing maps of theas-cast AZ80+RE magnesium alloy was built and analyzed according to the dynamicmodel. Accordingly, the optimum parameters for hot working of the alloy wereobtained: in the range of380-420℃and0.0005-0.005s-1.Then, according to the extrusion characteristics and forming requirements ofloading wheel. Study the method of traditional forming and radial-reverse compositeextrusion forming. Decide to use radial-reverse the forming process of compoundextrusion hollow billet. At the same time, using the finite element numerical simulation software to studied the extrusion forming process load force and the distribution lawsof strain and stress under different process parameters. With the increase of extrusiontemperature, extrusion equivalent stress and the forming load is reduced, the workpiecedeformation uniformity, good for improve the quality of extrusion. With the increase ofstrain rate, equivalent stress increased more obviously, and prone to defects influencethe performance of the products.Finally, comprehensive the above results, then designed the die of extrusion andtested the forming process of AZ80+RE magnesium alloy loading wheel. The resultsshow that: Produced road wheel’s size and performance have reached the requirementsof the product. Verify the feasibility of forming process and mould design is reasonable.The research provides the basis of theory and practice for the production and theextrusion die design of similar parts.