Dimensional Tolerance Standards For Metal Stamping Parts

Metal stamping parts processing is currently a commonly used metal processing method in China. In the production process of workpieces, due to the comprehensive influence of various factors such as machine equipment processing accuracy, mold wear, processing errors, etc., it is difficult to achieve precision in the size of metal stamping parts produced and processed.
Therefore, in order to ensure the availability of the workpiece, it is necessary to control the tolerance of metal stamping parts to the minimum. So do you know what tolerance standards are implemented for metal stamping parts?
The GB/T13914-2002 Dimensional Tolerances for Stamped Parts specifies the dimensional tolerances for stamped parts. Dimensional tolerances are specified for flat stamped parts and formed stamped parts respectively. The dimensional tolerance value of stamping parts is related to the dimensions of stamping parts and plate thickness, and on the other hand, it is related to the accuracy level.
Dimensional tolerance of flat stamped parts: divided into 11 levels, represented by ST1 to ST11, where ST represents the dimensional tolerance of flat stamped parts, and the tolerance level code is represented by Arabic numerals. The accuracy level decreases sequentially from ST1 to ST11.
Dimensional tolerance of formed stamping parts: formed stamping parts are divided into 10 accuracy levels, represented by FT1 to FT10, where FT represents the dimensional tolerance of formed stamping parts and Arabic numerals represent the tolerance level. The accuracy level decreases sequentially from FT1 to FT10.
Limit deviation of stamping parts: the hole size is 0 when pressed down, and the upper deviation is the lower deviation plus dimensional tolerance; The upper deviation of the shaft size is the basic deviation, with a value of 0, and the lower deviation is the upper deviation minus the dimensional tolerance. The upper and lower deviations of hole center distance, hole edge distance, bending, drawing length, height, etc. are specified as half of the dimensional tolerance.
Tolerance is the range of dimensional variation. The larger the numerical value, the lower the accuracy, and the less difficult the machining is. The smaller the numerical value, the higher the accuracy and the greater the machining difficulty.