The Research On Feed-path Computation Of Steel Casting Based On Temperature Gradient At Solid- Liquid Interface

As an important means of metal materials forming, the quality of the casting mainly depends on the control of its shrinkage cavity and porosity during casting solidification.Therefore, it's need to design a reasonable feeding system to control the defects and get high-quality castings. The design and optimization of the riser is an extremely important part, The information of hot spots such as the size, location and so on can be obtained by traditional design method, which provides the basis for the shape and size design of riser.However, the lack of the feeding direction and the feed-path length information makes it unable to provide a scientific basis for the location design of the riser, which may lead to the design of the riser is not optimal. Aiming at the shortage, this paper takes steel castings for instance and focuses on the feed-path computation.Firstly, the solid- liquid interface characterization model of steel casting solidification process is created based on the numerical simulation results of the two-dimensional and three-dimensional temperature field, which can quantitatively characterize the solid-liquid interface of the different moments in the two-dimensional and three-dimensional space.Secondly, the feed-path computation method of steel casting solidification process in the two-dimensional and three-dimensional space is proposed. In the two-dimensional space, 16 cases of temperature gradient at solid- liquid interface of the different moments are discussed and analysed, while there are a total of 64 kinds of ten categories cases in the three-dimensional space. And eventually, computing the feed-path of steel casting through PxtPjiij??????)1(, to obtain the feed-paths.Finally, the two-dimensional ladder model application example shows that the feeding direction and the feed-path length information can be obtained through the proposed method, and using the information not only the location of hot spots can be predicted, but also the location of potential dispersed porosity. the three-dimensional steel casting application example shows that the location of shrinkage cavity based on feed-path calculated by the method in this paper is match with the actual position, which illustratesthe validity of the method and its research can provide a basis for further optimization of feeding system and provide guiding significance for the actual process optimization.