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The four base processes of the die-casting aluminum industry are annealing, normalizing, quenching and tempering, and these four processes are known as the "four fires" in die casting, and the relationship between quenching and tempering is very close in the die-casting process, and the two are indispensable.

Normalizing is to heat the workpiece to the right temperature and cool it in the air, mainly used to improve the cutting function of the material, and can also be used for some parts that need not be high as the end of die casting. Quenching is to heat and hold the workpiece, in water, or by and other inorganic salt solution and other quenching media rapid cooling, after this process, the produced steel will harden, but also make the steel brittle. In order to reduce the brittleness of the steel, the quenched steel can be placed below 650 degrees Celsius at a temperature higher than normal temperature for a long time, and then cooled, which is called tempering.

Aluminum materials and aluminum alloy demonstrate inherently good fluidity and plasticity characteristics, making it possible to manufacture a variety of complex geometric shapes and intricate die casting designs that would be difficult or impossible to achieve through conventional casting methods, and when casting with aluminum alloy and metal aluminum through die casting processes, the resulting components exhibit high dimensional precision and superior surface finish quality, which to a considerable extent reduces the total volume of secondary machining operations required on casting surfaces, thereby greatly diminishing labor intensity throughout the production workflow while simultaneously conserving electricity consumption and reducing the quantity of metal materials wasted during finishing processes.