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Magnesium Alloy Lost Foam Casting numerical simulation of the filling performance

Author: SuWenLong
Tutor: LiQiuShu
School: Taiyuan University of Science and Technology
Course: Materials Processing Engineering
Keywords: Magnesium alloy Lost Foam Casting Numerical Simulation Filling performance
CLC: TG249.5
Type: Master's thesis
Year: 2011
Downloads: 107
Quote: 0
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Abstract


Magnesium alloy has many advantages , the increasingly wide range of applications in the automotive, electronics , aerospace and other fields . Currently, casting magnesium alloy production process urgently improved . Lost Foam Casting (Lost Foam Casting) is a cost-effective green casting process . The magnesium alloy disappearance mold casting is a combination of the new technology of advanced materials and advanced production technology , the future production of complex cavity , thin wall, the typing difficulties casting has a huge advantage . Lost foam casting filling process , due to the appearance pyrolysis and the interaction between the liquid metal filling capacity , resulting in a liquid metal cavity gravity casting . Using numerical simulation techniques can be qualitative, semi-quantitative studies casting filling law , and casting the results predicted . The paper systematically Research filling of lost foam casting ability to design the appearance of liquid metal flow . Affecting lost foam casting the many filling process factors were analyzed using orthogonal experiment method of pouring temperature , vacuum and pouring indenter liquidity . The research results show that the pouring temperature fluidity of magnesium alloy , the better the higher the pouring temperature fluidity . Conditions influence of the degree of vacuum , followed by its influence on the casting length is nonlinear , at 0.3 atm case flow length maximum, continues to increase , however, reduced the casting length ; sprue height minimal impact on the current length with the runner height increases gradually decreases . Multi-directional flow and may cause defects magnesium alloy in order to study the disappearance of the complex cavity mold casting , design a form model . Form model , lost foam casting compared to the traditional cavity filling sand casting smooth appears eddy less . Physical experiment , in the appearance in the embedded thermocouple, and recording the flow of process and temperature variation of the liquid metal . The experimental results and the simulation results are basically the same . In order to study the lost foam casting , gravity sensitivity designed a vertical plate model . The model results show that the filling in the bubble -like existence completely offset the gravity of the guiding role . Uniform liquid metal curved around advancing . Greatly slow down the erosion of the liquid metal in the conventional casting rolled phenomenon .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Casting > Special Casting > Precision Casting
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