Process for smelting and gravity casting of aluminum alloy wheel hub

Abstract

The invention discloses a process for the smelting and gravity casting of an aluminum alloy wheel hub, which comprises the following steps: 1, putting an aluminum alloy smelting material into a smelting furnace for smelting, and when the temperature in the smelting furnace reaches 740 to 760 DEG C, introducing nitrogen into the smelting furnace to blow a refining agent into the body of the furnace for refining; 2, adding an Al-Sr intermediate alloy, mischmetal (Re) and an Al-Zr intermediate alloy into a modification chamber to perform the combined modification and refinement treatment of the molten aluminum alloy in the modification chamber, and blowing nitrogen to the modification chamber to perform secondary degassing; 3, transferring the molten aluminum alloy into a using chamber to keep the temperature of the molten aluminum alloy between 690 and 720 DEG C for later use; and 4, pouring the melt in the using chamber into a mold by using an iron spoon at a speed, which increases first and then decreases, for 23 to 25 minutes at each time. The process can effectively discharge slag and degas, has excellent modification and refinement effects and contributes to improvement in product quality.

Description

Technical field: [0001] The invention relates to the smelting and gravity casting process of an aluminum alloy wheel hub. Background technique: [0002] Aluminum alloy is affected by non-metallic inclusions (AL 2 o 3 etc.) and one of the metals with the most serious hydrogen pollution, so the purification of aluminum alloy melt is an important method to improve the performance of the alloy, and it is also the key to improving the purity of aluminum alloy melt. Since inclusions in molten aluminum are accompanied by hydrogen and interact with each other, the two processes of hydrogen removal and impurity removal are related but also different. Various purification methods have one main effect, but also have another effect. Therefore, only one process is used in the production process, and it is very difficult to effectively remove impurities and degassing at the same time. [0003] In addition, for high-performance aluminum alloy automobile wheels, it is not enough to impro...

AI Technical Summary

Problems solved by technology

However, the phase composition, morphology and distribution of the Al-Ti-B refiner are extremely sensitive to factors such as the structure, solidification and solid-state treatment of the aluminum alloy solution, resulting in large differences in the microstructure and refinement effect, that is, in exactly the same Under the conditions of alloy composition and casting process, due to the difference in the structure and structure of the micro-auxiliary materials used, the structure and properties of aluminum products fluctuate unpredictably, and it is difficult to control the production quality of aluminum products