A kind of eutectic aluminum-silicon alloy production process

Abstract

The invention discloses a eutectic aluminum-silicon alloy production process. The process includes the following steps that materials are prepared, wherein the required materials are divided into two groups, the first group comprises silicon and pure aluminum, the second group comprises iron and an aluminum-manganese alloy, and the content of the silicon accounts for 11.7% to 11.9% of the total materials; the materials in the first group are added and heated to the temperature ranging from 730 DEG C to 750 DEG C; the materials in the second group are added and stirred so as to be mixed with the materials in the first group, and a mixture is heated to the temperature ranging from 800 DEG C to 830 DEG C; heating is stopped and nitrogen is injected for 8 to 12 minutes, and a refining agent with the content accounting for 0.2% to 0.3% of the total materials is added; stirring is performed after slag-off operation is performed, wherein melting liquid is heated, so that the temperature of the melting liquid is increased to 680 DEG C to 700 DEG C; and casting is performed and the temperature of the melting liquid is kept between 680 DEG C and 720 DEG C in the casting process. The technical problem that shrinkage cavities are generated easily in an existing eutectic aluminum-silicon alloy with the European Union die-casting aluminum mark number 47100 is solved and the eutectic aluminum-silicon alloy production process is capable of reducing or eliminating the shrinkage cavities.

Description

technical field [0001] The invention relates to the field of metal smelting. Specifically, it is a production process of eutectic aluminum-silicon alloy. Background technique [0002] Aluminum-silicon alloy has low density, low thermal expansion coefficient, good casting performance and wear resistance. The alloy castings cast with it have high impact resistance and good high-pressure compactness, which can greatly improve the service life. It is often used to produce aerospace vehicles and auto parts. [0003] The EU die-casting aluminum grade 47100 is a eutectic aluminum-silicon alloy, and the silicon content of the eutectic aluminum-silicon alloy is between 10.5% and 13.5%. In the current production process, in order to improve the qualified rate of products, silicon is formulated at a content of 12%. And when the silicon content is about 12%, the casting process is easy to produce shrinkage cavity or shrinkage porosity, resulting in a decline in the quality of the pro...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the shortcoming that the existing EU die-casting aluminum grade 47100 eutectic aluminum-silicon alloy is prone to shrinkage cavities, and to provide a production process for eutectic aluminum-silicon alloys that can reduce or eliminate shrinkage cavities