1. Causes The sand mold at the upper part of the outer rim of the casting supporting roller is a closed space. During the pouring process, if the liquid steel level rises too fast, it is very easy to choke, causing serious air hole defects. If the rising speed...
The castings without riser system were introduced into magma, and the pouring posture of the connecting flange at the top and bottom was respectively used for simulation. The starting temperature was 1580 ℃, and the defect prediction results were obtained, as shown in Fig. 1 and Fig. 2. It...
Fig. 1 shows the current mainstream pump casing casting process. The water system is injected at the parting surface height through risers respectively located at the foundation support and the outlet flange. The casting process gating system has the following defects: (1) The drop of internal water outlet is...
Through the discussion and application of metal subsidy, dark subsidy and heat subsidy, it can be seen that these three different subsidy methods have their own advantages and disadvantages. The characteristics of the three subsidy processes are compared as follows: Subsidy Scheme Process characteristics Application scenario Metal subsidies Simple...
Another subsidy method that does not require product structure design changes is heating subsidy. The heating subsidy is to add heating materials on the surface of the casting, heat the casting through the heating materials, and establish a feeding channel to achieve sequential solidification. Taking the model as an...
Since there are certain limitations and uneconomies in increasing metal subsidies, it is necessary to consider a process scheme that can achieve effective feeding without structural changes. Dark subsidy is a subsidy form that is not integrated with the casting. There is a thin sand layer between it and...
(1) The defects of the anchor support and the outlet flange are close to the processing surface, and the processing surface is a regular plane. By setting the side riser for feeding, the defect problem can be effectively solved, so I will not repeat it here. (2) The inlet...
Metal subsidy is one of the most common subsidies. Metal subsidy refers to the structure subsidized on the basis of the casting, which is integrated with the casting to establish a feeding channel for the casting, so as to effectively realize sequential solidification. Because the metal subsidies change the...
At present, the application of computer in simulation casting process mainly focuses on the following aspects: (1) Simulation of mold filling and solidification process. On the basis of a lot of basic research work, the numerical simulation of casting filling process has gradually reached a practical level. Many simulation...
Although a large number of valuable achievements have been made in the past few decades, some important research still puzzles researchers. As the only way to develop the foundry industry, computer simulation should have the following characteristics in the future development of simulation software: It must be able to...