Experimental Research Of AZ91D Motorcycle Engine Shell On Liquid Combination Process Of Die Casting And Forging

Because of the existence of plastic deformation, die forging can easily control performances of parts but the shape of parts would be limited greatly; however, because of rheological filling, die casting can not easily control performances but the shape of parts. If we adopt the advantages of two forming methods simultaneously, we can present a new forming method that is liquid combination process of die casting and forging. In fact in the die casting process, when the liquid metal have not solidified completely, in order to break arborescent structures which have already solidified and then proceed fine-crystal intensification, we apply a deforming force ,so the mechanical properties of parts produced by liquid combination process of die casting and forging will be improved significantly. And the parts can be heat treated in order to improve mechanical properties such as strength of extension etc. The liquid combination process is mainly applicable for car parts and other structural parts with complex shape and required high strength.The paper mainly introduces the implementation technique of liquid combination process of die casting and forging and the performances of parts which produced.Compared vertical injection system with horizontal injection system, we decide to select the former formation. We cooperate with Jiexun Machine Manufactory of Hong Kong to design and manufacture the special purpose machine which can batch production.Reference to the designation of die casting mould, we put forward some kinds of projects respect to the design and manufacture of dies of the special purpose machine. And we simulate die casting filling process,surface defect distribution and temperature field etc. of AZ91D magnesium alloy shell part with FLOW3D software. According to simulation results we decide the location of parting face and cooling system,the shape and location of runner and gating system etc.After that we take the AZ91D magnesium alloy shell of motorcycle engine as an example to proceed fine factors(plunger injection speed,pouring...