Brief introduction to the cause of forming pocket wave in cold-formed section steel and its solution

Cold formed section steel is a main material for making light steel structure. It is made of steel plate or steel strip by cold bending. It is a kind of special thin steel which can be made with wall thickness. It can be used in many aspects such as construction structure, vehicle manufacturing, agricultural machinery manufacturing, etc. There are many kinds of cold-formed section steel, such as opening and half closing according to the section, angle steel and Z-section steel according to the shape.

With the development of society and the progress of science and technology, the market of cold-formed steel is becoming larger and larger. Many manufacturers begin to invest in the production and processing of cold-formed steel, but there are also some problems in the process of producing cold-formed steel, such as bag shaped waves in the production process of cold-formed steel, which will affect the quality and performance of materials.

As a kind of thin steel, the probability of bag wave is higher than that of thick plate, mainly because the width of section edge of cold-formed steel has a certain influence on bag wave. The operator needs to apply a certain amount of tension to the plate to alleviate the bag wave phenomenon.

The formation of the bag wave is mainly due to the disconnection in the bending process, so there are transverse tensile stress and strain force in the bending place, so the longitudinal cold bending section steel will exert certain pressure on the middle part, so the middle part will be out of balance, resulting in the bag wave.