Understanding and deformation characteristics of stamping "bending"
Bending is the processing method of bending the blank or semi-finished
product of the straight plate or pipe profile into a certain Angle or a certain
shape with the mold or other tools. It is one of the basic processes of
Forming by bending
It is carried out on the mechanical press, friction press, or hydraulic
press, in addition, it is also carried out on special equipment such as plate
bending machines, pipe bending machines,s and tension bending machines.
Characteristic of bending
Tool to do linear motion called bending;
A tool makes a rotating motion called a bend or roll
The force and deformation characteristics of bending
In the bending process, when the external bending moment is applied to the
billet, the radius of curvature of the billet changes.
1) Elastic bending: At the beginning of deformation, the deformation degree
is small. The inner and outer surface materials with the greatest stress in the
billet deformation zone do not yield, and the materials in the deformation zone
are only elastic deformation.
2) Elastic-plastic bending: With the increase of deformation, the material in
the billet deformation zone and outer surface will yield first and enter the
plastic deformation state. With the further increase of deformation, the plastic
deformation gradually expands from the surface to the center.
3) Pure plastic bending: deformation to a certain extent, the whole
deformation area of the material is completely in a state of plastic