Aluminium alloy casting manufacturing process

Abstract

The invention provides an aluminium alloy casting manufacturing process, which has high working efficiency, high product percent of pass and good casting mechanical property. The aluminium alloy casting manufacturing process is characterized by comprising the following steps: melting, insulation, casting, finishing, thermal treatment and abrasive blasting. Dry nitrogen is blown into aluminium alloy liquid by a carbon rod, the nitrogen directly enters the aluminium alloy liquid so as to be capable of better taking away gas of the aluminium alloy liquid and removing the gaseous impurities in the aluminium alloy liquid and reducing the possibility that castings manufactured have air holes; and a holding furnace can control the temperature of the alloy liquid to maintain stable, thus further leading the temperature of the alloy liquid to maintain stable, avoiding the defects that the castings have air holes and sink holes, can not be insufficiently cast, or are unclear in outline, and the like, and improving the product percent of pass.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a casting manufacturing process. Background technique [0002] Due to the advantages of high tensile strength, good comprehensive mechanical properties of elongation, excellent corrosion resistance and low cost, aluminum alloy castings are widely used in machinery, communication and other industries. With the continuous improvement of people's performance requirements for aluminum alloy castings, more and more attention has been paid to how to manufacture aluminum alloy castings with excellent performance. For example, the patent CN 101966575A "Aluminum alloy wheel casting process and heat treatment process" adopts steps such as melting, casting molding, and heat treatment to effectively solve the problems of casting oxidation inclusions, pores, shrinkage cavities, and porosity. However, it is not easy to accurately control the temperature of the aluminum alloy liquid during the...

AI Technical Summary

Problems solved by technology

However, the temperature of the aluminum alloy liquid during the melting process is not easy to be accurately controlled, and the temperature of the aluminum alloy liquid during the casting process will gradually decrease with the progress of the casting process, which leads to the instability of the casting temperature

If the casting temperature is too high, due to the increased amount of gas and shrinkage of the molten metal, it is easy to cause pores, shrinkage cavities, and even cracks in the casting, and it will also shorten the life of the metal. Defects such as unclear outlines lead to an increase in the number of defective products

Moreover, the current heat treatment process has a limited number of castings each time, and it is difficult to process a large number of products at one time. The work efficiency is not high, and the processing time and temperature need to be counted manually, which is prone to operational errors and produces unqualified products.

In addition, the mechanical properties of castings also need to be improved