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Roll forming - Wikipedia
For example, the 9-meter octagonal light beam just can produce by bending machine cause the strip width and section drawing is not same from bottom to top. So bending different size of section by same strips is not advantages any more compare with new roll forming machines. Roll Forming and Press Brake are Two processes with the same result. However, roll forming and press braking are very different ways of getting the same result, and their economics are completely different too.
In the roll forming process , a specially shaped tube or section is made from steel strip: The steel strip is shaped incrementally by a series of consecutively positioned pairs of rolls — until the desired final cross-section is achieved. This method allows any desired shape to be produced. The technology of roll forming is characterized by low tool costs and high flexibility as well as the ability to vary length with a single tool. The newest voestalpine roll-forming site in Asia, voestalpine Profilform China Co.
In metalworking , rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness uniform. The concept is similar to the rolling of dough. Rolling is classified according to the temperature of the metal rolled. If the temperature of the metal is above its recrystallization temperature, then the process is known as hot rolling. If the temperature of the metal is below its recrystallization temperature, the process is known as cold rolling.