Research On Numerical Simulation Based On Rheological Moulding Of Magnesium Matrix Composites

Magnesium matrix composites,possessing small density,high strength to density ratios and stiffness to density ratios,and good dimension stability and excellent castability,are becoming the most view to use of composites in the field of modern high-technology. In addition, it also possess the properties of excellent damping vibration attenuation and electromagnetic shielding, and yet used as damping axis of steering wheel, piston ring, stent, case material of transmission and the confining medium of mobile-phone of communication electronic product.Now die casting is the mostly technology of magnesium alloy processing, but the traditional die casting technique is same for magnesium to others alloys, the same defects for poor filling,blisters,vortex,sunken,hot cracking,low mould life etc,which are caused by the high speed,high pressure and short filling time of die casting process,can be avoided and the inherent quality be improved by die casting technology of magnesium alloy rheocasting or thixo casting.But the cavity filling method and cavity filling capability and other methods of magnesium matrix composites semi-solid die casting aren't understood totally,it's desiderate to do some researches in these field.Traditionally,the optimum design of process parameters were obtained using experience law or trial and error method,which have been viewed as low efficiency and the result can not be guaranteed. By the aided of international recognized numerical simulation technique we can not only accurate picture the cavity filling process also can predict moulding fault among the die casting et al.In mis paper,semi-solid slurry Mg₂Si/AM60 matrix composites was produced by mechanical stirring,and established the apparent viscosity rheological model. Then secondary development of Flow-3D carried out on the platform of VS2005 software,and recompiled the operation program. After that taking circular disc as an example to proceed thress factors(plunger injection speed,pouring temperature,mould temperature)and three levels L₉(3³) orthogonal experiment by Flow-3D software. And find the optimized processing parameter with the help of orthogonal experiment.then make more detailed analysis about fluid,temperature ,stress,and defect distribution. By determining forming mechanics and position of defects of corrugation,shrinkage porosity in solidification processing etc,the simulation result tallies with actual die-casting result,so actual reappearance capacity of the simulation software of Flow-3D be validated,besides fully validated the correctness and feasibility of model. Process parameters can evaluation and optimization through numerical simulation,and help shorten the trial production and technology typing cycle of magnesium matrix composites casting,of course ,make better castings.