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The principle of casting method selection of die casting aluminum alloy parts represents a critical decision point in manufacturing operations that requires careful consideration of multiple technical and economic factors. Sand casting is preferred for die casting aluminum parts, mainly because sand casting has low cost, simple production process and short production cycle compared with other casting methods, making it the default choice for many manufacturers seeking to balance quality with affordability. Within the broader context of aluminum casting technologies, sand casting serves as the foundational approach that dominates small-to-medium production runs across automotive, aerospace, consumer goods and industrial equipment sectors.

The quality of die-cast aluminum has a great influence on the performance of mechanical products. For example, many types of pump impeller, shell and hydraulic cavity size, profile accuracy and surface roughness, directly affect the pump and hydraulic system efficiency, energy consumption and corrosion development, internal combustion engine cylinder block, cylinder head, cylinder liner, piston ring, exhaust pipe and other die-cast aluminum parts strength and heat resistance, directly affect the working life of the engine.