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The principle that the cold roll forming machine process should follow


A basic principle of the cold roll forming process is that the strips are bent in a straight line in the longitudinal direction. However, the pressure generated during the bending deformation combined with the residual stress present in the strip is often the deviation of the strip from the cold roll forming equipment. Describe the degree of deviation of the strip from the last forming roll. The most common terms are: side bends - horizontal bending, warping - vertical bending, twisting - spiral. In order to solve this problem, a straightening mechanism should be used at the end of the cold roll forming machine.
       The basic principle of the straightening mechanism is that for profiles with side bends, warpage and other defects, the deforming mechanism is forced to deform permanently in the opposite direction by a sufficient pressure. If the amount of deformation in the opposite direction is appropriate, the profile can be completely straightened after the rebound. If the profiled profile is distorted in a certain direction, the straightening mechanism sequentially rotates the profile in the opposite direction, resulting in permanent plastic deformation. If the angle of rotation is appropriate, the profile will no longer twist after the rebound.
       Straightening of the bend or twist is usually carried out between the last forming roll and the cutting die. If the last roll does not support the profile effectively, then the entire profile section must be supported when entering the side of the straightening mechanism. Straightening of the asymmetrical profile is such that torsional deformation is possible while straightening, in which case bending and torsion straightening are required simultaneously in the opposite direction of deformation of the profile. During the straightening process, the profile will move up, down, left and right, requiring a relatively loose gap between the straightening mechanism and the profile. There may be a certain gap between the straightening mechanism and the surface of the profile.

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