Sequential solidification principle

The principle of sequential solidification means that in the casting process, all parts of the casting should be gradually solidified in a certain order to avoid defects such as shrinkage cavity and blowhole and ensure the quality and performance of the casting. This principle is applicable to various casting processes, such as sand casting, die casting and precision casting.

In the casting process, the principle of sequential solidification is mainly embodied in two aspects: one is the sequential solidification inside the casting, and the other is the sequential solidification between the mold and the casting. For the sequential solidification inside the casting, it should start from the thin wall and gradually develop to the thick wall, so as to avoid the defects such as shrinkage cavity when the casting is too thick. For the sequential solidification between the mold and the casting, it should start from the outermost layer of the casting and gradually develop to the inside, so as to avoid the mold from leaving the casting prematurely and producing defects.

In practice, the principle of sequential solidification of castings needs to consider casting materials, casting technology, casting structure and other factors in order to formulate a reasonable casting scheme.

Characteristics of synchronous solidification, sequential solidification and paste solidification

In addition, in the casting process, it is necessary to monitor and control the solidification of the casting in real time, and carry out subsequent heat treatment and processing on the casting to ensure the quality and performance of the casting.