Knowledge of structural design of sheet metal parts (VII): Dimensional tolerance of sheet metal parts

Tolerance is one of the important factors affecting product quality and price. When manufacturing parts, experience tells us that no matter how much cost and time are invested, it is almost impossible to accurately process them according to the dimensions marked on the drawing. Product design should meet the needs of users in terms of performance and economy. From the enterprise itself, it must also maintain normal profits.

Therefore, the tolerance must be determined by the performance and economy of the product. Therefore, the design should fully grasp the principle of tolerance.

 (1) dimensional tolerance of punching parts.

(2) side height h and linear dimension tolerance of bending parts.

(4) height h dimension tolerance of drawing parts.

Note: the linear dimension tolerance of drawing side length l shall be in accordance with the table.

(6) section roughness of punching parts.