Research On Push-extrusion Forming Process Of Magnesium Alloy Cone Shell With Inner Ribs

Lightweight is one of the effective means to improve the mobility equipment and othertechnical indicators.The use of magnesium, aluminum, titanium and other light alloys andthin-walled, hollow, with ribs and other lightweight construction is an important way toachieve weight reduction.Magnesium alloy density, high strength, is lightweight material ofchoice for equipment;Ribbed structure of high reliability, light weight, is preferredconstruction equipment lightweight.However, having a close-packed hexagonal crystalstructure of magnesium alloy difficult deform able material；Conical shell with an inner ribis hard shaped structures.Unable to forming traditional crafts or can not meet theperformance requirements and other issues,Research conical shell forming the inner ribs ofnew technology,Integrally formed in order to achieve a magnesium alloy casing reinforcedwith inner ring.For deformation behavior of magnesium alloy and hard inner rib structure formingcharacteristics, proposed forming a conical housing inner ribs to push newtechnology.Application of plastic forming theory, the inner ribs formed pushing the metalflow, equivalent strain.In a typical product for the object, based on the design of itsextrusion, identified with the inner cone forming process tendons push.Using Deform3D simulation software,to push the metal flow during the formingprocess, forming load, equivalent strain and damage the work piece is analyzed,verify thefeasibility of pushing the inner ribs forming process plan.In forming load and deformationof uniformity of the objective function, through simulation, optimization of forming processparameters of the extrusion temperature, extrusion speed, friction coefficient, identified magnesium alloy cone shell forming the inner ribs pushing optimum parameters, theextrusion temperature was400℃, extrusion speed of1mm/s, the friction coefficient is0.5.The influence of punch radius R and punch diameter d to ring ribs forming was studied.When the radius value is small, increasing the radius R would have greater promoting effectto the ring rib height; and when R increases to a certain extent, the effect of promoting toformation was weakened. Increasing the punch diameter d would lead to the load increase,the height and width of the ring rib would become larger, too. Punch radius R at30, punchdiameter d at410mm was determined at last. According to the optimization parameters,push forming die for a typical product was designed and manufactured. Based on theoptimized process parameters, experimentation was implemented to conical shell with innerrib which met the requirements, and a new idea was provided for conical shell with innerrib.