Numerical Simulation of Planetary Frame Melt Molding Process
In order to solve the problems of unstable casting process quality and easy defects in a certain model of planetary frame,the work aims to analyze the shape,structure and material of the planetary frame and predict the distribution position and severity of shrinkage cavity of the casting by sand casting and numerical simulation calculation and propose a reasonable casting process scheme.ProCAST casting simulation software was employed to simulate,calculate and analyze the casting process of this model of planetary frame and the speed field,temperature field,solid phase rate and the distribution of defects of the casting in the filling and solidification process were studied,which were then compared with the defect area in the actual production of casting.Next,the casting process was optimized according to the simulation results.By adding risers at the top of the planetary frame and subsidies and risers in the side plate area,the defects in the lower half of the planetary frame were effectively solved.However,the riser above the side plate affected the solidification sequence of the upper half of the casting,which led to the shrinkage cavity defects in the upper half of the planet carrier.After the subsequent revision of the top riser size and the addition of side risers,the internal defects in the top cylinder and side plate of the planetary frame were effectively controlled,and the internal defect volume of the lower flange was reduced from 50.66 cm3 to 0 cm3,which met the production requirements.The casting simulation effectively guides the production practice of planetary frame castings and optimizes the production process.
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维普
