Aluminum castings often encounter oxidation slag inclusions, most of which are dispersed on the surface of the aluminum casting, and some are distributed in the corners where ventilation is not possible. The ports of these media are mostly yellow or gray white in color. During mechanical processing, it can be observed, and the reasons for such situations can also be found during acid or alkali washing. There are several points to consider: the materials used in the furnace are not clean enough, and the amount of recycled materials is too large; The designed pouring system is not very reasonable; The slag in the aluminum casting alloy liquid is not cleaned thoroughly enough; During the pouring process, the slag was also brought in due to improper operation; And to prevent a short period of calm after refining and deterioration treatment.
In order to effectively solve these problems, we need to master a reasonable and standardized pouring speed, and try to avoid involving gas as much as possible; Organic substances cannot be mixed into the core sand to reduce the gas generation of the material; Improve the exhaust function of the core sand to make it stronger; Reasonably select high-quality cold iron; Design flaws in improving the pouring system.