The technical requirements and quality requirements of the workpiece cannot be met. Therefore, the large disc of the casting is placed upward, and the large disc is used as the parting surface. The pouring method still selects the bottom injection type, the size remains unchanged, one set of casting system on both sides, and the casting is cast at the same time, and a cylindrical open riser is arranged at the uppermost flange of the casting, the size and quantity are one, The large feeding effect still uses the insulated riser. In short, when selecting a hot rolling mill, it is necessary to comprehensively consider factors such as investment capacity, market sales ability, production scale, product plan, own technology and management ability to determine the investment income of the enterprise.
It can be seen from this that the new scheme allows the casting to be solidified from the bottom to the top in a smooth manner, and the heat-insulating riser extends the feeding passage to make the casting more uniform. During the solidification process, there is no isolated liquid phase inside the casting. When the casting has completely solidified, the holding riser still has a molten metal that can be used for feeding. It can be seen from the figure that the feeding of the riser under the scheme is sufficient. The prediction results of the second defect are given. It can be seen that through the improvement scheme, the defects on the casting are significantly reduced, and the quality of the casting is qualified, which is the best solution. This scheme is verified by the actual production of a foundry of a company. The results show that the defects can be eliminated better and the products meet the quality requirements.
By changing the parting surface and the pouring position, and changing the riser to the heat-insulating riser, a more reasonable casting process plan was finally obtained. The process plan is verified by factory production, which can better eliminate defects and make the products meet the quality requirements.
Carburetant
Using the carburetant can make the most of the scrap steel and reduce using the pig iron. The content of carbon is very high. Its color is black.When the carburant is used in casting, the consumption of scrap steel can be greatly increased, and the consumption of pig iron can be reduced or pig iron is not needed. At present, most of the carburant is suitable for electric furnace smelting, and a small part of the carburant with particularly fast absorption speed is used for cupola. Charging method of electric furnace smelting, should be the carburant with waste steel and other materials into the casting, small dosage can choose to add on the surface of molten iron. But to avoid mass feeding into molten iron, in order to prevent excessive oxidation and carbon effect is not obvious and casting carbon content is not enough. The addition amount of the carburizing agent is determined according to the proportion of other raw materials and the carbon content. Different types of cast iron, according to the need to choose different types of carburant. The characteristics of carburant itself choose pure carbonaceous graphitizing substances, reduce excessive impurities in pig iron, the selection of carburant can reduce casting production costs.
Carburetant
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