Ferrous silicate condensed in the manufacturing process of precision casting has strong adhesion to precision castings, coatings and molding sand, and can firmly attach the molding sand to the surface of the casting, forming a series of low-melting compounds (in the thick wall of the casting). and corners, etc., low melting point and more sticky sand layers). The completion growth mode has changed from labor resource-intensive to skill-capital-intensive, and from extensive to green-intensive.

What are the technical requirements for precision casting production?

Product quality, variety and quantity. The proportion of materials has increased rapidly, the production efficiency and economic benefits of precision casting factories have doubled; environmental pollution has been effectively controlled, and the industrial system of foundry materials has been initially established to coordinate with the environment. Complete industrial restructuring, eliminate small precision casting factories with low technical level, poor product quality, serious pollution, and poor economic benefits, form a relatively concentrated giant and star enterprise, and achieve large-scale production.

The following is to share with you the knowledge about rust prevention of precision castings, because of the corrosion or discoloration in the atmosphere caused by oxygen, moisture, acid, salt and humid air, this is the so-called rust or rust. Metals or alloys can change the metallic outer layer to a low-strength compound. Therefore, investment casting often requires mid-term rust prevention.

How to avoid rust?

The way to avoid rust is generally to use water-based anti-rust or oil-based anti-rust. No matter what rust prevention method is chosen, the casting should be brushed first to remove the surface dirt and promote it to form a passivation film. Composition, temperature and use of brushes. After pouring, dry it with dry hot, monotonous compressed air, and then carry out anti-rust treatment.

To form a group of reasonable structure and high overall level of industry-university-research combined seminars, education and training bases, which can continuously deliver talents to enterprises, continuously develop new types of casting materials, meet people's increasing demand for casting materials, and gradually increase the export of skills. Structural design of precision casting castings: on the premise of ensuring its working function and mechanical function, comprehensively considering the requirements of casting process and alloy casting form on casting structure, whether the structural design is reasonable, has an important impact on the quality, productivity and cost of castings.

The surface sand formation of precision castings is caused by the oxidation of molten steel. The traditional foundry coating only acts as isolation and barrier between the casting and the mold, so as to avoid sand sticking, but sometimes it will stick to the casting part or a large area. This is due to high temperature liquid metal oxidation of metal oxides that occurs.

The main product is ferrous oxide with a melting point of 1370°C. The silicon oxide reacts chemically with the SiO2 of the molding sand to produce ferrous silicate. The melting point of ferrous silicate is low, as long as 1220 ℃, so the fluidity is very good. Even if the casting has a solidified outer shell, the newly formed ferrosilicate is still a liquid and can easily penetrate the coating and enter the sand pores.

Conclusion

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