Cast aluminum is a process in which aluminum in a molten state is poured into a mold and cooled to form an aluminum part of the required shape. Castings obtained by casting aluminum are called aluminum castings. The aluminum used in cast aluminum is called: cast aluminum alloy.
In the process of casting aluminum castings, it is easy to produce defects such as internal porosity, shrinkage holes, pores, etc. After these defective castings are machined, the surface dense layer components are removed and the internal structural defects are exposed. For automotive cast aluminum parts with sealing requirements, such as cylinder blocks, cylinder heads, intake manifolds, brake valve bodies, etc., when conducting pressure sealing tests, the existence of defective micropores will cause a large amount of leakage of the sealing medium. Waste products, and these defects are often found only after machining and pressure testing, resulting in serious waste of working hours, raw materials and energy.

In order to solve the problem of high scrap rate of automobile aluminum castings and save the castings that may be scrapped due to the above-mentioned defects, certain treatment measures must be taken in the production. The most common technique used is impregnation treatment, that is, leak plugging. The so-called "impregnation" is to infiltrate the infiltrant into the micropores of aluminum castings under certain conditions. After solidification, the filler that penetrates into the pores is connected to the inner wall of the casting pores to block the micropores and make the parts Process technology that meets the conditions of pressurization, anti-seepage and anti-leakage.

Aluminum castings have low cost, good manufacturability, remelting and regeneration to save resources and energy, so the application and development of this material are enduring. Such as research and development of cupola-electric furnace double smelting technology and equipment; extensive use of advanced molten iron desulfurization and filtration technology; thin-wall high-strength iron casting manufacturing technology; cast iron composite material manufacturing technology; cast iron surface or local strengthening technology; isothermal Yanghuo nodular cast iron complete set of technology; using metal mold casting, metal mold sand-coated casting, continuous casting and other special processes and equipment.　As a result of its low density, high specific strength, and corrosion resistance, cast light alloys will be widely used in aviation, aerospace, automotive, machinery and other industries.

Especially in the automobile industry, in order to reduce fuel consumption and improve energy efficiency, it is a long-term development trend to replace steel and iron castings with aluminum and nickel alloy castings. Among them, it focuses on solving pollution-free, high-efficiency, easy-to-operate refining technology, metamorphism technology, grain refinement technology and rapid detection technology in front of the furnace.

In order to further improve the performance of the material and maximize the potential of the material, high-quality aluminum alloy materials, especially aluminum-based composite materials, can be developed to meet the performance requirements of different working conditions; strengthen the research of the cluster alloy melting process, and continue the alloy die casting and squeeze casting Process and related technology development research; perfect ferroalloy smelting equipment and related technology and process development research.

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