Casting process

　　Lost-in-process production lineThe pouring process is the process of molten steel filling and foam mold evaporation. Throughout the process, it should be noted that:

(1) The runner shall be filled with molten steel from beginning to end. If it is not met, because the coating strength is limited, it is easy to cause sand collapse and air intake, resulting in casting defects.

(2) When pouring molten steel, grasp it to ensure stability, accuracy and speed. Instantly fill the pouring cup so that it flows in rapid succession, about one ton of molten steel a minute. If the molten steel of the casting in the same box is cut off, air will be sucked in, causing the sand hole to collapse or increase the porosity of the casting, resulting in the casting scrap.

(3) The lost vanescent mold production line adopts negative pressure closed type, which should be closed under the pouring cup. Molten steel into the forming mold, began to liquefy combustion, gasification disappeared. A temporary cavity is formed within a short distance of the front end of the molten steel, so the design filling speed of the molten steel is approximately the same as the speed at which the foam mold disappears.

In order to prevent molten steel from being irradiated at high temperature to melt other models in the same box, the runner should be far away from the casting technology model. Select the lowest horizontal position of the entire box of castings as the location of a vertical runner. During pouring, pay attention to control the vacuum degree of negative pressure to adjust the temperature within a certain range of influence. After pouring, maintain a certain negative pressure state through a period of working time, then stop the negative pressure, and exit the box after the molten steel condenses.

　　Lost-in-process production lineThe shortcomings and limitations

At present, the lost vanity mold production line enterprises have become an indispensable industry in the society. Its rapid development in recent years has brought great convenience to automobile production and production applications of various enterprises. It fundamentally reduces investment and production costs, saves input and output time in all aspects of the enterprise, and improves the labor efficiency of workers.Lost-in-process production lineAlthough the process has been widely used in the manufacturing industry, it has certain limitations and shortcomings like other casting processes. Not all castings are suitable for such production, according to the casting itself to analyze. This method can be considered from the following aspects:

The size of castings mainly considers the scope of application of corresponding equipment (such as tamping table and sand box).

The larger the batch of castings, the more substantial the economic benefits.

3. The more complex the casting structure, the more the technical advantages and economic benefits of the lost vanishing mold production line can be realized. In the case of narrow cavity channels and interlayers, before using the lost-form production line, the test should be carried out in advance.

4. The casting materials with good applicability and poor applicability are roughly in the following order: gray cast iron-non-ferrous alloy-ordinary carbon steel-ductile iron-low carbon steel and alloy steel; through necessary preparation, the process experiment and debugging cycle will not be too long.

When it is determined that the casting meets the above production conditions, it is possible to followLost-in-process production lineProcess method for casting.