Standard tolerances for stamped parts
“GB/T13914-2002 Stamping Parts Dimensional Tolerance” specifies the dimensional tolerance of stamping parts. Dimensional tolerances are specified separately for flat stampings and formed stampings. The dimensional tolerance value of stamping parts is related to the two dimensions of stamping part size and plate thickness, and on the other hand, it is related to the accuracy level.
The tolerance size of precision metal stamping parts is related to the size and the selected tolerance level. The selection of the tolerance level should not only meet the design requirements, but also consider the possibility and economy of the process. That is to say, in the case of satisfying the use requirements, Try to add to the tolerance value, that is, choose a lower tolerance level.
“GB/T13914-2002 Stamping Parts Dimensional Tolerance” specifies the dimensional tolerance of stamping parts. Dimensional tolerances are specified separately for flat stampings and formed stampings. The dimensional tolerance value of stamping parts is related to the two dimensions of stamping part size and plate thickness, and on the other hand, it is related to the accuracy level.
Dimensional tolerance of flat stamping parts: divided into 11 grades, represented by ST1 to ST11, where ST represents the dimensional tolerance of flat stamping parts, and the tolerance grade code is represented by Arabic numerals. Accuracy levels decrease sequentially from ST1 to ST11.
Dimensional tolerance of formed stamping parts: Formed stamping parts are divided into 10 precision grades, represented by FT1 to FT10, where FT represents the dimensional tolerance of formed stamping parts, and the Arabic numerals represent the tolerance level. The accuracy grades decrease sequentially from FT1 to FT10.
The limit deviation of stamping parts: the hole size pressing deviation is 0, the upper deviation is the lower deviation plus the dimensional tolerance; the shaft size stipulates that the upper deviation is the basic deviation, the value is 0, and the lower deviation is the upper deviation minus the dimensional tolerance. For hole center distance, hole edge distance, bending, drawing length, height and other upper and lower deviations are specified as half of the dimensional tolerance.
shaft actuator housing
Tolerance is the range of dimensional variation. The higher the value, the lower the precision and the less processing difficulty; the smaller the value, the higher the precision and the greater the processing difficulty. So, what are the most important items to pay attention to in production?
- Bending angle: the angular dimension of the stamping part formed by bending
- Punching angle: the angle dimension formed by punching at the plane of the flat plate or formed part
- Punching fillet radius: the linear dimension of the fillet radius of stamping parts processed by punching, blanking and other separation processes
- Forming size: the linear size of stamping parts processed by bending, stretching and other processes
- Punching size: the linear size of the stamping parts processed by punching, blanking and other separation processes
