Research On Inner Annular Rib Extrusion Forming Process Of Magnesium Alloy Conical Shell Parts For Aerospace

With the development of aerospace technology, light alloy complex integral component is more and more demanded. The part involved in this topic is a aerospace components with inner annular ribs which overall shaping is difficult. The materials is Mg-13Gd-4Y-2Zn-0.6Zr magnesium alloy. In this paper, labour-saving extrusion forming process of conical shell are formulated for this inner annular ribs part, and put forward inner annular rib wedge-loaded extrusion forming method, design related mold and experimental verification. The main works having been carried out are as follows:In the first, the rheological properties of Mg-13Gd-4Y-2Zn-0.6Zr magnesium alloy are systematic studied in the Gleeble-1500thermal simulation testing machine. The Johnson-Cook constitutive equation of Mg-13Gd-4Y-2Zn-0.6Zr is σ=(130-194.9ε3.7682)(1+0.127271nε*)(1-1.723T*0.134)Secondly, using the finite element analysis software Deform-3d, the labour-saving extrusion forming process was formulated for the author researched. Analyzed the preform billet thickness and the upper convex of terrace die on the influence of extrusion force.New process of inner annular rib wedge-loaded extrusion forming are put forward. Designing three different structure of split mode and through the numerical simulation to determine the best split structure. In determining the structure of split mode, research the effects of die corner radius and tilt angle on the metal filling behavior. Analyzed the billet temperature and radial feed velocity of split mode on the equivalent effective stress, equivalent effective strain and damage value in the Inner rib forming process. Get the best technological parameters for the billet temperature is380℃, mold temperature is420℃, the radial feed velocity is2mm. s-1.At last, on the basis of mold structure and process parameters, design related mold and conduct experiment. The experiment results show that through labour-saving extrusion and innerannular rib wedge-loaded extrusion forming can realize this large component forming. Theinner annular after forming is Reinforcement and no obvious defect inspection, the formingprocess has been verified.