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Aluminum casting is an important metal processing technology. It involves pouring molten aluminum or aluminum alloys into molds and then forming aluminum parts of the desired shape after cooling. This technological method is widely applied in various industrial fields and is highly favored for its ability to produce aluminum products with complex shapes and high precision. The following introduces several common aluminum casting methods. 

First of all, sand casting is a fundamental and commonly used method in aluminum casting. It uses special casting sand as the mold material, pours molten aluminum into it, and removes the castings after cooling. This method has a simple process and low cost, and is suitable for single-piece or small-batch production. Meanwhile, sand casting has relatively high flexibility and can produce molds of various complex shapes. 

Secondly, pressure casting is an efficient and highly precise casting method. It uses high pressure to inject molten aluminium or aluminium alloy into a metal mold. Due to the effect of pressure, the casting can solidify rapidly and achieve a relatively high density and strength. This method is applicable to mass production and can produce aluminum products with complex shapes and accurate dimensions. 

In addition, investment casting and loss-in-weight casting are also commonly used methods in aluminum casting. Investment casting forms castings by making an investment mold and pouring molten aluminum. It is suitable for the production of high-precision and small-sized aluminum products. Loss-in-weight casting, on the other hand, takes advantage of the special conditions in a loss-in-weight environment for casting, which can produce defect-free and high-quality aluminum castings.

In conclusion, there are various common casting methods for aluminum casting, and each method has its unique advantages and applicable scope. In practical applications, it is necessary to select the appropriate casting method based on the specific requirements of the product and production conditions to ensure the production of high-quality aluminum products.