The following is the basic knowledge of cold forming profiles, bending deformation conditions are as follows: rolling deformation, the section there is a neutral line, the neutral line above and below, respectively, there are compressive stress and tensile stress. The farther away from the neutral line, the greater the stress value, and when it exceeds the σb value of the metal, more breaks occur there.

Thus, the necessary conditions for cold-bending deformation - the maximum normal stress on the curved section σmax, satisfies the condition: σs ≤ σmax ≤ σbσmax, which depends on the thickness of the workpiece and the degree of single-pass bending.

The smaller the radius of curvature, the greater the degree of bending; the thicker the rolling, the larger the normal radius of curvature, the greater the normal stress of bending that occurs at the upper and lower edges of the rolled stock.

Therefore, for ease of cold bending, sigma should be reduced, such as: the use of lower σs steel, or cold bending before annealing. In order to prevent cracks during bending, it is necessary to control the degree of bending of each pass of rolling so that σmax≤σb. Jiangsu Shanghai cold-formed profiles professional providers.