Development And Application Of Physical Simulation Platform For Vertical Centrifugal Casting Filling Process

As a kind of special casting technology, the centrifugal casting is widely applied in fields of military, aviation and spaceflight due to its many advantages. The technique of physical simulation can be used to analyze the productive process of this casting method. It can predict shrinkage defects, optimize casting technology and control the centrifugal casting quality. Based on the vertical centrifugal casting process characteristic and similarity criterion, the vertical centrifugal casting physical simulation platform is designed and developed.Firstly, the theoretical basis of physical simulation platform development is analyzed. According to characteristics of vertical centrifugal casting process, the influence of pouring speed, rotational speed, viscosity and other parameters on the fluid filling process and the shape of free surface under vertical centrifugal field are analyzed. Through the similarity principle, the similarity criterion is derived, the Reynolds number is determined as the decisive similarity criterion.Then the physical simulation platform is designed and developed. The platform includes the vertical centrifugal casting machine, the flow control system and image acquisition system. The platform can enable stepless speed and instantaneous speed measurement. It also can realize integration control of casting, speed regulation and velocity measurement. At the same time, it can realize the arbitrary velocity determination and regulation, obtain the moment of the fluid filling process diagram, provide data support for the subsequent three-dimensional fluid flow analysis.Finally, we use physical simulation platform to study the influence of process parameters on the fluid filling process from qualitative and quantitative. It is found that the filling speed is proportional to the casting speed, and is inversely proportional to the rotational speed and time. The greater the viscosity, the longer the pouring time. According to the similarity criterion, individual phenomenon can be generalized to go with a similar model in a series of real-world phenomena, provide guidance for the actual production.