Papers by Keyword: Isothermal Extrusion

Abstract: According to the structure features of the piston, the method of combining application of finite element simulation and theoretical analysis was explored to determine the extrusion process program and the extrusion process parameters. Theoretical calculation shows that a longitudinal extrusion and a lateral extrusion can form piston. The result comparing simulative prediction with theoretical calculation demonstrates that there is a good fit between the two and the theoretical calculation is right. The result of simulative prediction demonstrates that the grain size of piston after extrusion is about 17.8 μm and the refining rate reaches 55%. The grain size on both sides of the piston skirt and piston internal floor place is about 27 μm, so the refining effect is less obvious than other parts. However, the grain refinement in the piston pin holes is more obvious, the grain is refined to 13 μm and the refining rate is about 67.5%.The result comparing simulative prediction with the experimental analysis demonstrates that there is a good fit in grain refinement between the two.

Abstract: The techniques of isothermal extrusion and mould are designed for the hilt of electric screwdriver. The deformation process is simulated with finite element method software-DEFORM-3D, the force of deformation for the hilt of electric screwdriver is predicted, is 250 KN. The Isothermal extrusion is processed by the pressure machine-YAW-500kN. The project of deformation and the correctness of simulation analysis are verified on the process experiment.

Abstract: In the present work, a two-dimensional finite difference model is built to realize the online control of the aluminum ingot tapered cooling process. The temperature evolution of aluminum ingot in the tapered cooling process is analyzed. According to the feature of the tapered cooling process, an efficient and simple algorithm of cooling time is developed. Online application shows that the efficiency and the accuracy of the control model can meet the production requirements.

Abstract: In the present work, a finite difference model (FDM) is built to predict the transient temperature field of the aluminum billet in the gradient cooling process. The billet is divided in 5 segments, each of which is corresponding with one water cooling ring, and all of which are water-cooled for different times respectively in order to obtain the target temperature gradient. On the following air cooling stage, the temperature of the outer layers, especially the surface, rises first, then falls slowly. With the rising of the surface temperature, the temperature deviation from the center to the surface is narrowed intensively. In comparison with the commercial finite element method (FEM) software, Deform 3D, the FDM model gets nearly the same prediction results as FEM simulation does.