Can the tension leveller eliminate the wave shape of strip steel completely?
We take the longest and shortest fibers in the cross section of the strip and analyze their elastic and plastic deformations under the action of tension. In addition to external force because of tension by strip in straightening process, and bending stress and bending stress is tensile stress and compressive stress of the component, and the main role is tensile stress, the main deformation so through the analysis of tensile deformation on behalf of strip.
Reflecting the shape of the board, the wave height is reduced or the wavelength is lengthened. That is, the tension straightener can only reduce the wave and improve the shape of the plate, but can not fundamentally eliminate the wave, and get an ideal smooth strip steel. There is an old saying called "correction must be positive". That is to completely eliminate the wave must be of short fiber than long fiber tension and bending is greater, elastic and plastic deformation of the original long fiber length is greater than a certain amount, resulting in the removal of external force, elastic recovery, length of fiber length, so as to obtain the shape completely flat the. However, in the current conditions of the straightening machine equipment, do not have such a function.
Deformation of strip in tension and bending. There are two sides of the strip wave, the edge of the long fiber and short fiber into the middle; stretching and straightening machine Zhang Ligun, high tension length of the fiber are elastic deformation, the deformation is in the same length; bending roll, tensile and bending interaction length of the fiber plastic the deformation happened, Wuxi Tiangong metallurgical production straightening machine total length is still the same, which is different from the original long fiber produced by plastic deformation is small, the original short fiber produced by large plastic deformation; tension and bending stress to remove all strip elastic deformation recovery, leaving only the plastic deformation, then the original short fiber than long fibers obtained permanent large plastic deformation, long fiber length and narrow the gap, but still a long long fiber, short fiber is still relatively short.
