Introduction of Finishing Mill Group

The finishing mill is the core equipment in the production of hot-rolled strip steel. It is mainly used to roll the intermediate billet that has been rough-rolled and cut into strip steel of finished specifications. The following is a detailed introduction to the finishing mill:

I.Basic composition of the finishing mill

The finishing mill is generally composed of multiple rolling mills, which are arranged in a continuous manner. The thickness and width of the strip steel are controlled by adjusting the parameters of each rolling mill (such as the number of rolls, roll spacing, tension, etc.), thereby achieving precise control of the strip steel. Its equipment composition usually includes:

Roller before the head shear: used to guide the strip steel into the head shear.

Head shear: used to cut off the head and tail parts of the strip steel to eliminate irregular shapes and low-temperature areas and avoid problems during rolling.

Edge heater: used to heat the edge of the strip steel to make the temperature of the middle and edge of the strip steel on the cross section uniform and improve the quality of the strip steel.

Finishing descaling box: use high-pressure water to remove the iron oxide scale on the surface of the strip steel.

Finishing mill: including front vertical roll mill (FIE) and each mill of the finishing mill group, it is the key equipment for finished product rolling.

Looping device: installed between every two stands, used to support the strip, maintain the tension of the strip between the stands, and participate in the speed control of the finishing mill group.

Inlet and outlet guides of the finishing mill: used to guide the strip in and out of the mill.

Dust removal device: protect the equipment and operating environment from pollution.

Roll changing device: used to replace the rolls to ensure the continuity and stability of rolling.

II. Working principle of the finishing mill group

The working principle of the finishing mill group is to put the hot-rolled strip into the finishing mill group for continuous rolling after the head cutting flying shear. During the rolling process, the parameters of each rolling mill are adjusted to achieve precise control of the strip, and finally rolled into finished strip that meets the requirements.

III. Technical features of finishing mill

1. High precision: The finishing mill adopts many new equipment, new technologies and new processes, such as hot-rolled strip shape control equipment, fully hydraulic pressing device, etc., to ensure high-quality products.

2. High efficiency: The finishing mill adopts a continuous layout, which can achieve high-speed and efficient rolling production.

3. Flexibility: The finishing mill can adapt to the rolling needs of strip steel of different specifications and materials, and has high flexibility.

4. Environmental protection: Environmental protection equipment such as dust removal devices are set in the finishing mill to reduce pollution to the environment.

IV. Application field of finishing mill

The finishing mill is widely used in the hot-rolled strip production line of the steel industry and is a key equipment for producing high-quality strip steel. With the advancement of process, equipment and electrical control technology, the application of finishing mills in high-speed wire production lines such as stainless steel and special steel is becoming more and more extensive.

V. Development trend of finishing mill

In the future, finishing mills will develop in a more efficient, intelligent and environmentally friendly direction. For example, adopting technical means such as modular design and full digital control to improve rolling efficiency and product quality; at the same time, strengthening the research and development and application of environmental protection equipment to reduce pollution emissions in the production process. In addition, with the diversification and high-level requirements for strip performance, the finishing mill also needs to continue to innovate technology and upgrade to meet market demand.

In summary, the finishing mill is one of the core equipment in the production of hot-rolled strip steel, with complex composition, advanced technology and wide application. With the continuous advancement of process technology and the continuous changes in market demand, the finishing mill will continue to play an important role and continue to develop and improve.