What is the reason why the middle of the folded workpiece is bent?

There are three reasons why the bending machine bends out of the middle of the workpiece:

1. It may be caused by the unevenness of the upper punch and the lower die. In order to achieve the angle, the quick clap is moved, so the angle is the same, but the straightness is not enough.

2. Without deflection compensation, the reason is similar to the first one.

3. The upper ram and the lower worktable can be marked by the marking method, to see whether they are parallel, find out the reason, and then find a solution.