Research Based On Numerical Simulation Aluminum Alloy Hood Board Of Sand Casting

The numerical simulation of temperature field in the solidification process is onekey point of the casting CAE technology, and it is also the basis of predicting theshrink holes, shrinks flaw, crack and segregation in castings. The numericalsimulation of temperature field should include the following factors: material thermalproperties, initial conditions, boundary conditions and so on, which will influence theprecisions of simulation directly and affect the application of the casting CAEtechnology in more fields.In the casting process, the casting-cast interfacial heat transfer behavior decidesthe process of the solidification of casting, further affects the formation and evolutionof the inner construction of the casting, the generation and distribution of relateddeficits and final mechanical properties as well.The interfacial heat transfercoefficient (IHTC) is one of the important parameters of the casting-cast interfacialheat transfer behavior. IHTC is so important that how to solve this parameterprecisely has become one of the popular subjects which were widely conc erned by theresearchers.We have carried on one systemic experiment of sand-casting, established theanalog of IHTC. By ProCAST, one casting CAE software,basis on the tempraturemeasured in the experiment,using the back analysis combining the Numericalsimulationa and optimization which solve the IHTC between the casting andsand-model in the the process of the solidification of A356aluminium alloycasting,also analysis the relationship of the IHTC between the casting and sand-modeland the interfacial temprature. we got the IHTC, with which we also constructed thesand-casting model of aluminum-alloy engine board. We optimize the casting systemby contrasting the models,applying Finite Element Simulation,by simulating theprocess of filling and consolidation of the large thin A356aluminimum alloy castingin different pouring method,prediciting the position where the defects may appear,wealso analysis the advantages and disadvantages of different kinds of pouring systemby contrast.And the simulating results shows that Rain-style Pouring System willbenefit the filling of the large thin aluminimum alloy casting.The process of filling issteady,and the consolidation is orderly, while the gas entrapment and shrink holes,shrinks flaws are also seldom.By applying the Rain-style Pouring System， the experiment proved to obtain complete filling mold, the outline is clear, the surfaceroughness is lesser, and the casting surface adhering sand phenomenon is not much,no surface crack casting products. We verified the back analysis method which solveheat transfer coefficient eventually.