How is the Casting of aluminum Alloy Accomplished?

For producing casting aluminum parts, casting is one of the major paths that are taken. In foundry alloys, good casting ability includes a short casting cycle, relatively high fluidity, and the relatively low tendency for hot cracking, good as-cast surface finish, low melting point, and chemical stability. In the case of Al-Si alloys, a treatment called eutectic modification is used to change the eutectic silicon from the coarse plate into fine fibrous morphology that is less harmful to mechanical performance. Main shape casting processes include permanent mold casting, high-pressure die casting, low-pressure die casting, and sand casting. For filling the alloy into the mold/ die and feeding the solidification shrinkage each process has its strategy.

Aluminum is one such metal that can be cast by all of the processes that are used in casting metals. In decreasing order of amount of cast aluminum, the processes involved are: die casting, investment casting, sand casting (green sand and dry sand), permanent mold casting, plaster casting, and continuous casting.

To respond to urgent demand the delivery time might be too long, depending on your product and the workload of your casting partner. Also, there is low dimensional accuracy in this casting method and, thus, it will not produce very complex products. With every casting method, the result becomes different. As they have their limitations and possibilities, there comes a need to compare different methods with each other. This way, for your production needs you can choose the most suitable casting method.

For producing a specific aluminum alloy part many factors affect the selection of a casting process. For all casting processes the most important factors are:

• Factors related to quality.
• Cost factors and Feasibility

Generally, Aluminum alloy dies castings are not heat-treated but sometimes are given dimensional and metallurgical stabilization treatments.

Because of entrapped gases die castings are not easily welded or heat treated. For the pressure-tight part, special techniques and care in production are needed. The selection of an alloy becomes helpful with a narrow freezing range. In some die casting foundries, for the production of parts for some special applications, the use of vacuum for cavity venting is practiced by cast aluminum manufacturer.

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