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The role of straightening mechanism in cold forming equipment


Cold bending means that the strip is bent in a straight line (cold forming mold) along the longitudinal direction. The pressure generated during the bending deformation is combined with the residual stress in the strip, which often causes the strip to deviate from the cold forming roller. center. To describe the degree of deviation of the strip from the last forming roll, the most commonly used words are: side bending-bending in the horizontal direction, warping-bending in the vertical direction, twisting-in a spiral shape. 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 to apply sufficient pressure in the opposite direction through the straightening mechanism to permanently deform the profile with defects such as side bending and warping. If the amount of deformation in the opposite direction is appropriate, the profile can be completely straightened after rebounding. If the profile is twisted in a certain direction, the straightening mechanism rotates the profile in the opposite direction in order to produce permanent plastic deformation. If the angle of rotation is appropriate, the profile will no longer be twisted after rebounding.
       The straightening of bending or twisting is usually carried out between the last forming roll and the cutting die. If the last roll cannot effectively support the profile, then when entering one side of the straightening mechanism, the entire section of the profile must be supported. Straightening of asymmetrical profiles may occur torsional deformation while straightening. At this time, it is necessary to perform bending and torsional straightening at the same time in the opposite direction of profile deformation. During the straightening process, the profile will move up and down, left and right, which requires a relatively loose gap between the straightening mechanism and the profile. There can be a certain gap between the straightening mechanism and the surface of the profile.

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