Simulation Study On Er Modification And Low Pressure Casting Of Aluminum Cans For High Voltage Electrical Switches

The aluminum tank for high-voltage electrical switches is an important part of high-voltage electrical switchgear and plays a central role in power transmission systems.A3 5 6.2 aluminum alloy is widely used as the material of aluminum tank for high voltage electrical switches because of its low density,high specific strength,high specific rigidity,corrosion resistance,and good casting properties.The coarse pin-like distribution of the eutectic silicon in the as-cast A356.2 aluminum alloy makes the α-Al phase matrix severely fractured and affects the mechanical properties of the A356.2 aluminum alloy.Based on the experimental and numerical analysis,the aluminum tank material and its foundry technology for high voltage electrical switch are studied in this paper.The innovation of this article is as follows1 Tensile properties testing,quantitative metallographic analysis,X-ray diffraction,stankning electron microscopy,and energy spectrum analysis and testing methods were used to study on the effect of ag modification on the aging process,microstructure and mechanical properties of aluminum tank material A356.2 aluminum alloy for high voltage electrical Switch.the optimum addition amount of rare earth Er was determined to reveal the metamorphic mechanism of Er modification on eutectic silicon.The results show that the modification of eutectic silicon in A356.2 alloy by rare earth Er is achieved by limiting the growth of eutectic silicon.When 0.4%rare earth Er is added to A356.2 alloy,the effect of alloy modification is best.At this time,the eutectic silicon is fine coral or fibrous,and the secondary dendritic arm spacing of α-Al phase is signifitanktly reduced.Tensile strength,elongation,and as-cast hardness increase obviously.2 ProCAST software was used to numerically simulate the filling and solidification process of aluminum tanks used in high-voltage electrical switches.The flow field and temperature field during the casting process were analyzed to predict the location of shrinkage shrinkage and shrinkage of castings.Through the improvement of the original pouring system and cooling system,the castings tank achieve a solidification sequence from top to bottom,reducing the occurrence of shrinkage shrinkage defects.Through orthogonal experiments,the effects of pouring temperature and filling pressure on the low-pressure sand casting process were discussed,and the best casting process parameters were determined.3 Trial production of aluminum tanks for high voltage electrical switches.After the sand box modeling,aluminum alloy melting,de-slag gas removal,low pressure casting,mold opening and other processes to obtain aluminum tanks casting.The quality inspection of the castings was carried out through X-ray inspection,water pressure detection,and air tightness testing.The rationality of the optimized casting process parameters,the casting system,and the cooling system was verified.