Steel Strip Cold Rolling Process Design
Introduction
Steel strip cold rolling is a process by which a metal strip is passed through a pair of rolls at a room temperature or slightly elevated temperature below its recrystallization temperature. The two rollers rotate in the opposite directions, and the roll gap should be properly configured. Through these two strategies, the raw strip material can be reduced in the thickness and rolled into a strip of specified size and width.
Traditional concepts think that the strip temperature should be lower than the recrystallization temperature during cold rolling process, so as to avoid too much deformation and damage to the surface of the strip. Although this method can effectively reduce the deformation and production cost to a certain extent, its output weight and size accuracy is not good enough.
Softening process
In order to solve the above two problems and make the output weight and size accuracy of steel strip meet the process requirements, it is necessary to carry out softening process of steel strip before cold rolling. Through a proper softening process, the mechanical properties of steel strip can be improved along the rolling direction, which can reduce the deformation times and improve the precision of strip shape. In the corresponding softening process, the temperature of steel strip should not exceed the recrystallization temperature of steel material.
Selection of rolling parameters
In order to ensure the qualified quality of steel strip after cold rolling, the parameters of cold rolling should be reasonably selected. Generally, when the material is carbon steel, the rolling parameters such as roll gap or opening, roll speed, roll pressure, roll surface roughness etc. should be optimized. Roll gap should depend on the characteristics of strip material, and the roll speed should not make the rolling temperature too high, so as to avoid excessive deformation. Meanwhile, in order to reduce the generated material loss, the roll pressure and roll surface roughness should also be selected reasonably. Moreover, all these parameters should satisfy the requirements of strip size and quality, and meet the ultimate goal of improving output weight and size accuracy.
Conclusion
In conclusion, properly designed steel strip cold rolling process can effectively improve the output weight and size accuracy of rolled strip, and reduce the deformation times to a certain extent. Softening process should be done beforehand, and the parameters of cold rolling should be reasonably configured. Only by selecting the appropriate cold rolling parameters, the qualified steel strip cold rolling process can be effectively achieved.
