Caprefers to a forming method in which, using the action of a mold, an angle with a certain degree is formed on the edge of a closed or open curve along the plane or curved surface part of the blank to form a straight wall or a flange. Bending is a type of stamping process. There are many types of bending, and the classification methods are not exactly the same. Among them, according to the nature of deformation, it can be divided into stretching bending and compression bending.