FEM Analysis And Optimal Designing Of Mg-alloy Equal Channel Angular Pressing Hydraulic Press

In recent years, with the development of the technology, magnesium and magnesium alloys have already become a popular type of structural metallic material which has immense potential of applications because of its excellent properties and abundant resources. But in terms of its disadvantages of poor mechanical properties and bad corrosion resistance, the traditional methods of magnesium alloy processing can on longer meet the requirement of modern processing. According to this situation, a new type of preparation method which is based on the Large plastic deformation theory attracts extensive attention worldwide which we name it equal channel angular pressing, ECAP for short. Therefore finding some specialized equipment to realize this processing method is very necessary. At the same time,hydraulic machine, as one of the most important manufacturing equipment, has always been the first choice to study the machining deformation of metallic material, in view of its wider use and flexibility of the structure.The hydraulic machine mentioned in this essay is designed as integral frame structure. This machine consists of top housing separate, bottom end rail, left and right girders and four colums. A specialized mould is designed for the extrusion forming. The rack of the machine as the core part of the machine not only bears the weight of all components, but also bears the nominal pressure form the oil cylinders. The extrusion die as the final process of manufacture,Whether if the structure design could meet the requirement, could have a great effect on the deflection of the magnesium alloy bar after the extrusion process. The coupling may happens between rack and mould if the rack deforms while working due to the lack of rigidity, which will be harmful for the experimental result. To avoid the wasting raw materials and the structural redundancy, we use the ANSYS to establish the FEM model of rack and mould for numerical modeling, then optimize the structure design based on some effective analysis results, aiming at improving properties of this machine.First of all, according to the basic theories of mechanical design, we try to describe the design of rack and mould of this hydraulic machine based on the structural design theories.Then we need to calculate the strength and rigidity of the machine which is simplified to get the final scheme.Secondly, applying load to the 3D model of the rack in the ANSYS working circumstance according to the physical truth. Then use the ANSYS to do the static structural analysis coming out with the tress and deformation images, which will show us the region of stressconcentration on the rack.Thirdly, we build the mould’s 3D model by Pro-E. Then put the model in the ANSYS working circumstance to get tress and deformation images, on the condition of setting working temperature, extrusion pressure, extrusion velocity and some other related parameters.At the last, according to the analysis results given by the ANSYS, redesign the region of stress concentration on the rack and mould. Then analyze the structure again to guarantee the safety of the machine while working.