By conventional molding methods: conventional roll forming machine production and a variety of square and rectangular hollow steel profiled most of the first round after a variance, rectangular or shaped tubes. Roll forming machine production of cold-formed steel due to the development of new technology, and now the use of anti-bending roller type design (ie, W-type roller design), starting shape, and bend the strip edge, while in the middle of the strip to give and a direction opposite to the curved edge of the bending deformation, low consumption because of wave and side portions extending bulge caused. This method is new technology to improve the roll forming machine to produce large diameter thin-walled circular products have a significant effect, and because some of forming rolls can be shared, will help to improve product quality and reduce the cost of roll film.
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