Leveling rolls for universal rolling mill
Leveling rolls, also known as universal rolls, play an important role in the production of steel in the universal rolling mill of modern metallurgical enterprises. They are mainly used to roll steel plates and flat steel products.
A universal rolling mill, as its name suggests, is a universal rolling equipment. It has wide versatility and can be used for the production of various types of steels and steel sections. Its universal rolls are used for the entire process, from flat rolling and strip rolling to mid-width rolling and plate rolling. During the entire rolling process, the positioning and leveling of the rolled strip are very important, and the use of universal rolls plays a crucial role in this process.
The working principle of universal roll is simple. The roll gap adjustment wheel of the roll working shaft drives the roll gap adjustment wheel to rotate and adjust the gap between the working roll and the smaller roll, and the flatness of the rolled strip can be adjusted through the operation of the roll gap adjustment wheel. On the other hand, leveling rolls are also used to keep the steel strip flat in the rolling process to reduce wave wrinkles, since uneven steel strip can easily cause wrinkles or other deformations during rolling.
In general, the rollers used in universal rolling mill are arranged in two rows with four-high or six-high configuration. The top two rollers are usually larger, called work rolls, and the lower two or four rollers are usually smaller and called correction rolls. The two sets of rolls are relative to the plane, and the two rolls are arranged at 90° to each other. Comparison of the two sets of rolls requires fine adjustment. This is achieved through the rotation of the adjustment alignment wheel. The adjustment wheel is driven by an electric motor via a worm gear.
In general, the leveling roll in the universal rolling mill has a practical range of 0.05mm. In order to ensure the accuracy of the roll curvature, the wall thickness of the roll is greater than 0.3mm and the surface finish of the roll is greater than Ra2.5. When installing the leveling roll, pay attention to the fact that the roll should be pushed in and out with sufficient speed during installation and removal, so that the stress generated within the roll can be eliminated as soon as possible.
In order to improve the roll performance, it is necessary to heat the roll before use. Therefore, before the roll is used, it must go through a heat treatment process. Common methods include quenching and tempering. After the heat treatment is completed, the hardness, yield strength and elongation of the roll are greatly improved, which greatly improves the performance of the roll.
In short, leveling rolls are an important component of the universal rolling mill and are essential for ensuring the levelness of steel plate and flat steel products. In addition, the performance of this type of roll depend on the heat treatment process and the choice of material.
