Knowledge of structural design of sheet metal parts (VIII): Allowable height of burr of punching parts

1. Allowable burr height of punching parts

(1) limit value of burr of blanking parts

It is not allowed that the burr of blanking parts exceeds a certain height. The limit value of burr height of stamping parts (mm) is shown in the table below.

 (2) marking requirements for burrs in design drawings

*Burr direction: burr side.

*Parts requiring burring: coin or coin continue. Generally, do not press all the burrs on the fracture of the whole structural member, which will increase the cost. Try to use it in the following situations: the fracture exposed to the outside; Sharp edges often touched by hands; Holes or slots that need to pass through the cable; There are relative sliding parts.