Simulation To Practical Flowing Process Of Centrifugal Casting

As a kind of special casting technology, the centrifugal casting is playing a more and more significant role in the foundry industry due to its many advantages. The technique of numerical 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. In this thesis, a foundry CAE system of these practical productive processes is developed based on the numerical simulation.Obviously, mold filling is the first stage of the whole productive process. It is said that the numerical simulation of fluid flow during the filling stage must be carried out first. On the foundation of particularities of centrifugal metal flowing pressure, the shapes of surfaces and two kinds of inertial force are analyzed. The module for recommending rotation speed of the mold is built on the basis of K. formula. What's more, after these parts, aiming at the characteristics of the centrifugal casting, an appropriate numerical module is brought forward, with some rational boundary conditions. According to the requests of the technicians, the liquid is divided into two parts, and the analysis methods are different between them.The flowing process of the centrifugal casting is more complex, during which huge heat transfer is taking place. Fluid flow calculations ignoring heat transfer will be over simplified and hence not correct. In order to simulate the mold filling stage properly, fluid flow and heat transfer must be taken into account at the same time. Therefore, a 3-D numerical simulation program coupling fluid field and temperature field of this kind of casting has been also developed.Finally, with the help of whole productive process simulation, a foundry CAE system of the centrifugal casting has been studied. It can recommend a rotation speed, predict filling sequence, flow pattern, and forecast the time to stop the rotation. It can also manifest the temperature distribution during the process of filling. So it can effectively control the cast quality.