The roll forming machine is through the configuration to form metal sheet, lateral bending the metal sheet constantly, to make specific section sheet metal molding technology. The cold bending forming is a kind of material saving, energy saving, efficiency, and the advanced and applicable plate metal molding process. The performance of roll forming machine had been further improved in the 70s, and at the same time, elbow tube was successfully developed, and supporting the use of the roll forming machine, they can bend oil and gas pipeline steel tube, the maximum tube bending diameter to 1524 mm. Foreign large diameter long distance pipeline construction, since the 1960s the United States began using vertical hydraulic pipe bender, can bending 6 to 30 inches thickness of all kinds of steel pipe. At present in the world, the United States, Canada and Germany and other developed countries have nearly 10 roll forming machine manufacturers, the basic structure is vertical hydraulic, tire mainly formed of pneumatic and hydraulic two kinds. The hydraulic tube by the hydraulic pressure station, compact structure, and hydraulic transmission was stable and reliable, and can ensure that deformation does not happen in pipeline prefabrication process. Pneumatic type structure inner tire features high speed, elbow pipe prefabrication high efficiency. 
Cold-formed steel production is the main material of light steel structure, made of the steel plate or steel belt of cold bending forming. It can be made as very thin wall thickness, and simplify the production process, improve the production efficiency. The roll forming machine can produce with general wall thickness but section of the complex shape of various materials and different material cold-formed steel that hot rolling can’t produce. In addition to all kinds of architectural structure, cold-formed steel is also widely used in vehicle manufacturing, agricultural machinery and so on. According to the shape of the cold bending channels, angles, Z type, square tubes, rectangular tubes, irregular pipe, rolling door, etc. Cold-formed steel belongs to economic section steel, also is the high efficiency and energy saving material, is a robust new steel variety, it is widely applied in each field of national economy, its utility generally can be divided into the guardrail board, steel structure, car, container, steel formwork and scaffold, railway vehicle, ship and bridges, steel sheet pile, transmission tower, and so on other 10 categories. 
The China roll former has better work performance than press machine. The roll forming machine is driven by incoming oil cylinder sides frame swings around to finish feeding, and frame through the main bending oil cylinder driving to realize the bending, reverse bending, S bending, H bending and so on processing work. The roll forming machine mainly has hydraulic roll forming machine, automatic roll forming machine, large roll forming machine, program-controlled roll forming machine, steel roll forming machine, etc. The roll forming machine is widely used in aerospace, architecture, petrochemical, wrought iron doors and windows, water pipes, decoration, petroleum, chemical industry, wastewater treatment, paper mill, and so on.
