Simulation And Process Research On Casting Process Of Crankshaft Castings

The traditional casting forming process cannot directly observe the temperature field,flow field,and internal defects of the molten metal during the forming process of the casting.Casting numerical simulation technology can clearly show the problems of castings in the molding process through images,analyze the defects and defects in the filling and solidification process,predict the position and cause of the defects,and improve the casting scheme and optimize the casting process parameters..In this paper,the numerical simulation technology is used to simulate the casting process of the crankshaft of the vehicle,which provides a reference for the casting process of the crankshaft.This paper takes the crankshaft of the vehicle as the object,designs the casting system size and selects the casting scheme,and based on the numerical simulation theory,uses ProCAST casting software to simulate the casting filling and solidification process,and the temperature field,velocity field and isolation during the forming process.The liquid phase,casting defects,etc.are analyzed to predict the cause of the defect.The specific research contents of this paper are as follows:Comparing the preliminary options of vertical pouring and horizontal cooling,the results show that the castings under the vertical casting have larger shrinkage and shrinkage cavities,which have a serious impact on the quality of the castings.Compared with the vertical casting,the riser has a better feeding effect,and the volume of the shrinkage and shrinkage of the casting is reduced.Therefore,the casting method of the crank castings is better.Although the volume of the shrinkage and shrinkage of the crankshaft casting is reduced under the horizontal casting scheme,the volume of the shrinkage and shrinkage hole is larger at the main neck,and a cold iron is added at the main neck of the maximum position of the shrinkage and shrinkage hole.A vent hole is added above the riser.The improved solution basically achieves sequential solidification of the casting solidification process and improves the quality of the casting.At the same time,the casting temperature and casting speed process parameters were further studied.The results show that with the increase of casting temperature,the filling time of crankshaft castings is not significantly reduced,the casting quality is improved,and the casting tem-perature is 1380°C~1400°C Suitable;as the casting speed increases,the solid fraction of the casting decreases first and then increases,and the volume of the shrinkage shrinkage first decreases and then increases,and the optimum pouring speed is 6kG/s.Based on the discrete element method analysis software,the filling process of crankshaft castings under multi-dimensional vibration conditions is simulated.The influence of different vibration parameters on the filling ability of castings is s tudied.At the same time,the orthogonal test is designed to explore the sensitivity of different vibration parameters.The results show that the sensitivity of each factor to the filling distance of castings is frequency,degree of freedom and amplitude from large to small.At last,similar simulation experiments are used to test the correctness of multi-dimensional vibration filling results of discrete element simulation.The results show that multi-dimensional vibration filling based on discrete element simulation has certain accuracy.Figure[38] table[19] reference[63]...