When Roll forming machine be invented, it brings up the development of our industry. Roll forming, often called open-section forming, uses successive sets of roller dies to bend a strip of steel progressively until the desired shape is achieved. This process is very similar to traditional tube - and pipe making, but differs in that it can form more complicated sections.
Roll forming is a new and novel process for production of close tolerance metallic products and is close to the earlier plastics sheet roll forming processes for various profiles and other shapes. The procedure is applied to generally steel and aluminum sheets that need to be converted to profiles of different shapes and sizes. It is greatly superior and more economical than conventional forming or shaping processes thus resulting in wide acceptance of the method by a number of end users and converting or fabrication companies.
Roll forming the tube is described best as a progressive edge form, high oval without idlers. The strip is formed from the outside using an over formed radius on the first pass of about 15 degrees. The second pass forms the next 15 degrees, allowing the first pass work to relax, and then continuing using this type of forming method, allowing the high oval to stay in the sides.
Roll formed sections have an advantage over extrusions of a similar shapes. Roll former parts are generally much lighter and stronger, having been work hardened in a cold state. Another advantage is that the part can be made having a finish or already painted. Labor is greatly reduced since volume is a major consideration for choosing the roll forming process.
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