Straightening process of cold roll forming machine

The basic principle of the cold forming process is that the strip is bent straight in the longitudinal direction. However, the pressure generated during the bending deformation is combined with the residual stress in the strip, and the strip often deviates from the cold bending equipment. In order to describe the degree of deviation of the strip from the next forming roll, the commonly used words are: side bending-horizontal bending, warping-vertical bending, twisted spiral. In order to solve this problem, a straightening mechanism should be used at the end of the roll forming machine.

The basic principle of the straightening mechanism is that for profiles with defects such as side bending and warping, the straightening mechanism should bear enough pressure in the opposite direction to cause permanent deformation. If the amount of deformation in the opposite direction is appropriate, the contour can be completely straightened after rebounding. If the profile is twisted in a certain direction, the straightening mechanism will rotate the profile in the opposite direction to produce permanent plastic deformation. If the rotation angle is right, the contour will no longer be distorted after the rebound.

With the expansion of the automobile market, especially the promotion of trucks, the side panels of Q345 material have been widely used. The cold forming unit of the body panel in the picture is a new type of automobile designed by our company according to customer requirements. The material belt on the bracket plate is thinner than the ordinary material belt, but it is stronger and faster, which better meets customer requirements.