Infiltration Equipment Company explains the description of individual defects in aluminum castings

The infiltration of aluminum castings is environmentally friendly and has a strong vitality. Especially since entering the new century, the development of infiltration equipment companies has become more and more powerful.

The aluminum castings are precisely impregnated and have almost no allowance, which is in line with the historical trend of lightweight, precise and complicated castings. Its knowledge covers mechanical, chemical, metallurgical, foundry, computer and other multidisciplinary. Due to the change of objective conditions such as dry sand modeling and solid gasification wall negative pressure, the production process is greatly reduced, the process flow is shortened, the production is greatly facilitated, the production efficiency is improved, the working environment is improved, and the labor is reduced. Strength, its advantages are obvious. Because the production community has not fully understood its deep laws, management is still not in place, which has brought troubles to the application of new technologies. Some casting defects are endless and preventable.

The aluminum casting infiltration is very special, the dry sand molding does not have any adhesive, and the molding and casting do not need to take out the mold, which greatly improves the freedom of casting design and improves the surface finish and dimensional accuracy of the casting. The use of a box of multi-casting process formed by vacuum compaction is conducive to improving the process yield and improving production efficiency. These are revolutions to the traditional casting subversiveness. Many deep-seated laws rely on the cooperation of industry, academia and research institutes for many years. It is recognized that various casting defects are quite different from traditional casting in terms of formation mechanism.

During the filling process of aluminum castings, strong heat radiation acts to form an irregular gap layer between the metal front and the foam. Taking the bottom casting as an example, the front edge of the metal filling is in a "concave" shape, and the corresponding foam end is in the form of a sawtooth or a fingertip. The solid front slag and the insufficiently vaporized liquid phase foam float on the front edge of the alloy. Because of the positive pressure in the gap, the coating is under negative pressure. The difference in pressure forces the solid slag and liquid phase foam to follow the trend of the gas. Flow, the gas exists in a small molecule state and is easily discharged by the negative pressure, and the solid impurities are blocked on the inner wall of the coating, that is, the surface of the casting forms a surface slag pit, which is the reduction of the internal casting slag hole in the aluminum casting. The main reason for the external slag hole is that the liquid foam is also displaced at the interface between the metal and the coating, partially adsorbed by the coating, and partially vaporized. Most of the secondary gasification gas overflows, and a small amount of intrusive metal forms surface pores. The riser of the casting is generally designed at the top, and it is a dark riser. It cannot obtain high-temperature metal by means of refilling. The aggregated metal is all metal after being cooled by vaporization and heat absorption, the shrinking effect is not good, and the shrinkage probability is increased. .