The technical process of foreign cold roll forming equipment has a history of more than 100 years, and is roughly divided into three stages.
The first stage (1838-1909) is the exploration and trial production stage. In this stage, the roll forming theory and cold-formed steel research work progressed slowly. With the rapid development of the industrial transportation industry, the cold-formed steel produced by the roll dome forming process can no longer meet user requirements.
The second stage (1910-1959) is the stage of cold roll forming machineestablishing and gradually popularizing the roll forming process.
The third stage (from 1960 to 1960) is the stage of rapid development of roll forming production.
The development trend of foreign cold-formed steel production can be summarized in several aspects:
1. Production continues to increase
Since the 1960s, the output of foreign cold-formed steel has increased rapidly. This is the general trend. According to the statistics of cold-formed steel in various countries over the years, the output of cold-formed steel and the output of steel are relatively stable at a certain ratio, generally 1.5:100 to 4:100.
With the improvement of cold-formed steel production technology, product specifications and varieties continue to increase, product quality continues to improve, and the scope of application is expanding.
2. Research work is deepening
Research work on roll forming theory, forming process and forming equipment is in-depth abroad, and a series of progress has been made in the research on the practical application of cold formed steel.
For example, the former Soviet Union and the United States have used electronic computers to study the force and energy parameters in cold bending forming and discuss the deformation method with the lowest energy consumption.
3. New processes continue to appear
Since the roll forming process was successfully studied in the United States in 1910, after decades of improvement and perfection, the forming process has become more mature.
Users have more and more stringent requirements for the quality of cold-formed steel, and require diversification of varieties and specifications, which promotes the continuous improvement of roll forming processes to adapt to user requirements.
In the development of roll forming technology and the corresponding equipment developed abroad, a vertical roll forming machine with an insert type is used. The forming unit with centralized adjustment of the forming roll is referred to as the CTA unit (Central Tool Adjustment), and the straight edge forming unit.
4. The product variety continues to increase, and the product structure is constantly updated.
With the development of cold-formed steel production and the expansion of the scope of application, the varieties of cold-formed steel continue to increase, the product structure is constantly updated, and the product standards are gradually improved.
With the continuous emergence of new technologies, the range of billet materials and specifications is expanding. There are more than 10,000 cold-formed steel varieties and specifications produced abroad.