What is the casting function and new polishing technology of aluminum die casting?

Release time: 2019-04-15

Die casting is a kind of precision casting method that uses high pressure to force metal melt into metal mold with complex shape. Because of its large condensation latent heat during the operation of aluminum die casting, the condensation process of its aluminum liquid is much longer than that of cast steel and cast iron continuously at the same component during the operation, and the flow release is outstanding, which is conducive to casting thin-walled and disordered castings.
During the operation of aluminum die casting, alkaline polishing solution system is required. To some extent, the effects of corrosion inhibitors and viscosity agents on the polishing effect are compared. To some extent, an alkaline solution system with good polishing effect is successfully obtained, and additives that can reduce the operating temperature, prolong the service life of the solution and improve the polishing effect are obtained.
Effective addition of appropriate additives in the aluminum die casting solution can produce good polishing effect. In the process of operation, the reflectivity of aluminum surface can reach 90% after DC constant voltage electrolytic polishing of the solution under certain conditions. The feasibility of DC pulse electrolytic polishing method for aluminum polishing under alkaline conditions is explored. The results show that the DC constant voltage electrolytic polishing method can achieve the leveling effect, However, the leveling speed is slow.
Aluminum die casting has determined to develop a new environment-friendly chemical polishing technology with phosphoric acid sulfuric acid as the base liquid. This technology should achieve zero NOx emission and overcome the quality defects of previous similar technologies. The key of the new technology is to add some compounds with special effects to the base solution to replace nitric acid. Therefore, it is necessary to analyze the tri acid chemical polishing process of aluminum, especially the role of nitric acid.
Aluminum die casting has incomparable advantages over other castings in the process of operation. In the process of operation, especially since automobile lightweight, aluminum die casting has been widely used in the car industry. The density of cast aluminum alloy is smaller than that of cast iron and cast steel, while the specific strength is higher. Therefore, selecting aluminum alloy castings under the same load conditions can reduce the weight of the layout. Therefore, aluminum alloy castings are widely used in the aviation industry, power machinery and transportation machinery manufacturing.

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