Dimensional accuracy and surface quality of metal stamping parts

The dimensional accuracy of metal stamping parts refers to the difference between the actual size of the stamping part and the basic size. The smaller the difference, the higher the dimensional accuracy of the metal stamping part. The main factors that cause dimensional errors of metal stamping parts are: the manufacturing accuracy of the convex and concave molds; the gap between the convex and concave molds; the elastic recovery of the material after stamping; accidental factors in the production process, such as inaccurate positioning and unstable material properties.

The dimensional accuracy of metal stamping parts can generally be divided into two types: precision level and ordinary level. The precision level is the accuracy that can be achieved technically in the stamping process, while the ordinary level is the accuracy that can be achieved by more economical means. When the mold manufacturing accuracy is high, the external dimension accuracy of the metal stamping parts can reach IT10 level, and the inner hole size can reach IT9 level.

The surface quality of the metal stamping parts should not be higher than the surface quality of the raw materials, otherwise it will be achieved by adding subsequent processing, which will increase the production cost.