1. Material requirements. Mainly including hardness, tensile strength, elongation, and impact toughness.
2. Dimensional accuracy and positional accuracy. Different castings have different requirements, using different dimensional and geometric tolerance standards and different tolerance levels.
3. According to usage requirements, specify acceptance requirements for other defects in castings. Such as pores, sand holes, shrinkage, porosity, slag inclusion, sand inclusion, cracks, etc.
Pouring liquid metal into a mold cavity that is suitable for the shape and size of the part, and waiting for it to cool and solidify to obtain a blank or part is called a casting.