During the production process, when the strip steel is cold-rolled on the cold rolling mill, due to improper machine adjustment or other reasons, the cross-sections of the strip steel with different widths are bent or uneven. This situation is called the primary convexity of the strip steel. The primary convexity will seriously affect the quality of the strip steel, thereby affecting the use effect and sales of the product.
There are many causes of the primary convexity of the strip steel. Factors such as the robustness of the measurement system, the stiffness of the rollers, and the tangential friction may all lead to the appearance of the primary convexity of the strip steel. In addition, the stiffness and adjustment performance of the equipment itself will also play an important role.

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