Finite Element Numerical Simulation Of Impeller Inducer Under Low-Pressure Die Casting

The computer simulation & emulation technology can make the product structure to be optimized, the product quality be improved, the product development time be shortened and the production costs be depressed. The experiential research techniques are being substituted by the computer simulation & emulation technology, which is becoming a rising region for the low-pressure die casting even the entire foundry subject.In the present paper, based on the analysis and research of the flow and temperature field, the boundary condition and the initial condition were properly set, the problem of the latent heat was reasonably settled, and the filling and solidification process of the aluminous impeller inducer was successfully simulated by using ANSYS software and coupling calculation of the flow and temperature field. The impeller inducer has 37 pieces of curved space blades and a bigger difference of wall thickness, so the structure is very complex and the required precision is also higher. The successful simulation of the impeller inducer will provide a reference for the posterior products such as the wheel boss and the impeller wheel. The main research work and conclusions are presented as follows.1. The whole filling time of the impeller inducer under low-pressure casting is 82s, and the freezing time 248s when the filling process was finished.2. The simulation results show that the temperature 992.64 K of the pouring head is highest, the temperature 970.172 K of the compass rafter lowest, and that of the edge between the outer wheel boss and the curved space blades is lower than others3. The simulation result of the temperature field shows that some places of the impeller inducer such as the curved space blades, the outer compass rafter and spokes and the blade of the inner wheel, which are likely the source region of all sorts of casting defects, need to be improved from the aspect of the design optimization.4. It can be seen from the results of simulation optimization that it is appropriate andeffective to avoid the casting defects to appear likely in some places by using the heat-insulating materials. Although the retarded coagulation can be obtained in the curved space blades, it's effect isn't satisfying.5. The efficiency of the simulation calculation can be enhanced by the appropriate model building and grid subdivision, the calculation speed settling and the optimization between the load infliction and the results display.