The strength and surface hardness of the casting is higher. Due to the chilling effect of the die-casting mold, it crystallizes under pressure. Therefore, the surface layer of the die-casting has finer grains and dense structure, so the hardness and strength of the surface layer are relatively high. The tensile strength of die castings is generally 25% to 30% higher than that of sand castings, but the elongation is lower.
Thin-walled castings with complex shapes can be die-casted. Because the forming process of die-casting parts is always filled and solidified under pressure, the contour peaks and valleys, convexities and valleys, narrow grooves, etc. can be clearly die-casted. For parts with complex shapes that are difficult or impossible to manufacture by cutting, even if the output is small, die casting is usually used, especially when other casting methods or other metal forming processes are difficult to manufacture, die casting is the most suitable.
Very high productivity Among all casting methods, die casting is the most productive method. This is mainly determined by the characteristics of the die-casting process, and it will increase with the further development of the mechanization and automation of the production process. Compared with other casting methods, die casting also saves or even completely eliminates the machining man-hours and equipment of the parts. According to some information, using a die-casting machine to produce a certain batch of parts can save 15 to 60 metal cutting machine tools.
The assembly operation can be omitted and the manufacturing process can be simplified. During die casting production, other metal or non-metal material parts can be embedded to improve the local strength of the die casting and meet certain special requirements (such as wear resistance, insulation, magnetic permeability, etc.), and Improve the manufacturability of the casting structure. Die casting can not only obtain parts with complex shapes, high precision, stable dimensions, and good interchangeability, but also inlay die casting to replace the assembly of certain parts and simplify the manufacturing process, improve the working performance of die castings, and save energy and reduce consumption.