Keep it under a certain negative pressure

In the lost foam process, the pouring process is a crucial part of the entire lost foam casting process. Mastering the pouring precautions and strictly controlling every detail in the pouring process are the keys to producing high quality lost foam castings. 1. The casting process of lost foam casting is a process in which the molten steel is filled and the foaming mold vaporizes and disappears. The whole process needs to pay attention to: ① The sprue should be filled with molten steel from beginning to end. If it is not full, due to the limited strength of the coating layer, it is easy for mold sand to collapse and the phenomenon of air intake to cause casting defects. ②Be sure to grasp when pouring molten steel to ensure stability, accuracy and speed.
Fill the gate cup instantaneously and achieve rapid and continuous flow, about 1 minute per ton of molten steel. If the molten steel flow of the same box casting will suck in the air, it may cause the phenomenon of sand collapse or the increase of the porosity of the casting, resulting in the scrap of the casting. ③ Lost foam casting adopts negative pressure closed type, and it must be closed under the gate cup. The molten steel enters the molding die, and it begins to liquefy and burn, and vaporizes and disappears. The front end of the molten steel forms a temporary cavity at a short distance, so the speed of designing the filling of the molten steel is almost the same as that of the foam model. In order to prevent the molten steel from high temperature radiation melting other models in the same box, the runner should be far away from the casting model. Select the lowest position of the whole box casting for the position of the vertical runner. When pouring, pay attention to adjust and control the vacuum degree of negative pressure within a certain range.
After pouring, keep it under a certain negative pressure for a period of time. The negative pressure stops and the molten steel condenses and comes out of the box. 2. Lost foam casting is one of the casting processes. There are various casting defects in the casting process, which lead to defects in castings. Lost foam casting is no exception. Back spray is a common phenomenon in lost foam casting. When the back spray is serious, it may endanger the safety of the caster. It must be taken seriously. To reduce the spray phenomenon, the following measures can be taken: ① The density of the foam model should be small, and the brass gear Suppliers quality of the foam surface should be ensured. Under the premise of ensuring the strength of the model, the lighter the foam should be, the better, in order to reduce the amount of gas generated during pouring. ②The foam model must be dried before coating. Each batch of foam model should be randomly checked for the weight change during the drying process to make a baking weight change curve.
Only when the weight no longer changes, the coating can be applied. ③The pouring system, especially the sprue and cross-runner should not be coated with paint, so that the gas generated during pouring can be quickly and fully evacuated, and the paint is not coated, which saves the consumption of paint. Finally, a baffle plate is placed above the gate cup to block the molten steel from being sprayed back so that it cannot splash out, endangering the on-site operation workers. The use of the above method can effectively prevent the back-spray phenomenon in the lost foam casting process, better prevent the defects of the casting, improve the quality of the casting, and in addition, it can also improve the safety of production.

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The pouring system, especially the sprue and cross-runner should not be coated with paint, so that the gas generated during pouring can be quickly and fully evacuated, and the paint is not coated, which saves the consumption of paint. Finally, a baffle plate is placed above the gate cup to block the molten steel from being sprayed back so that it cannot splash out, endangering the on-site operation workers. The use of the above method can effectively prevent the back-spray phenomenon in the lost foam casting process, better prevent the defects of the casting, improve the quality of the casting, and in addition, it can also improve the safety of production.

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