Research On The Low Pressure Casting Of High Performance Aluminum Alloy GIS Tank Based On ProCAST

As the current phase of one of the most widely used, performance level for optimalpower transmission GIS technology for power transmission and transformation ofsmooth-running work offers great support. Under China’s existing technical conditions,generally to sand casting, forming tank Foundry patterns, although an economic,stability characteristics, but in the actual application of process in susceptible to leakage,low overall quality level. Introduction of GIS tank technology in a factory, paper No.00014tank as the research object, its numerical simulation of low pressure die castingprocess, comparing the simulation results and actual production, and submitted on thebasis of numerical simulation optimizes design.In order to ensure that the aluminum alloy liquid can fill in the cavity stably anduniformly, four inner gates were set, and the riser tube was cylinder in shape, with adiameter of50mm. Based on the flowing characteristics of mold-filling underlow-pressure casting, UG3D modeling software and ProCAST analog simulationsoftware were adopted to conduct a numerical simulation on the mold-filling andsolidification of aluminum alloy tank of the high-voltage switchgear under low pressurecasting.Based on the simulation results of the low-pressure casting of the tank in differentcasting temperature and mold-filling pressure, the formation causes of the flaws in thecasting during solidification process were analyzed and new technological parametersfor producing the aluminum alloy tank of high-voltage switchgear were determined bycombing the practical situation to be that the casting temperature is T=730℃andmold-filling pressure is P=0.056MPa, and the preheating temperature of the mould is300℃. But even if those three optimized parameters were adopted, there were still someflaws in the castings represented by depression, shrinkage cavity and porosity on theupper part of the castings.The solution adopted was to increase the thickness of external wall the lower partof the castings and to increase the width of ingate. Since the cross-section area of theingate was larger than that of original ingate, and the module here was larger than thaton the hot spot of castings, the final solidified part should be on the ingate, and thequality of castings should be guaranteed. Meanwhile, as a kind of open gating system,its mold filling would be more steady. After testing the solution with numericalsimulation, then an optimized process scheme was gained.