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How have rolling mills evolved across generations, and what are the characteristics of each?
Release date:
2021-04-01
With the maturation and widespread adoption of third-generation hot rolling technology, the development trends of continuous casting machines and walking-beam heating furnaces have converged, further advancing the evolution of the third-generation hot rolling mill. Additionally, the associated regenerative burners boast exceptional heating capacity, effectively minimizing black spots caused by heating and reducing surface scratches on the slab.
The development trend of hot rolling mills, as this type of mill represents, has been evident for quite some time. Throughout this entire process, it has directly witnessed the rotation of several generations of products, which has further enhanced the role of hot rolling mills. With steadily improving performance and increasingly superior characteristics, these mills can now accommodate a wide range of cold-rolling operations tailored to specific requirements.
I believe the early wide-band steel hot rolling mills were built and put into production abroad. At that time, four-high mill configurations were chosen to enhance rigidity and enable the production of wide, thin products. This generation of mills typically processed slabs with thicknesses ranging from 130 to 150 millimeters, widths from 1,500 to 1,550 millimeters, and lengths between 2.3 and 5 meters. The roughing mill usually produced rolled pieces with thicknesses of 30 to 40 millimeters, while the finishing mill operated at high speeds, reaching 8 to 12 meters per second.
After continuous practical trials and improvements, the third-generation hot rolling mill has been launched. Its key feature is the adoption of advanced cold-rolling technology that boosts speed on the mill—enabling smoother transitions as the steel strip exits the finishing mill, passes through front-end development equipment, and is then conveyed via roller tables directly into the coiler. Importantly, the coiler can now accelerate in tandem with the mill, further enhancing both precision and overall rolling speed.
In this hot rolling mill, automatic thickness control, as well as thickness and width measurement instrument panels, have also been selected. Additionally, advanced iron-removal equipment, scale-removal systems, and an automated water-cooling system for the strip steel have been implemented, complemented by an exceptional speed-control system and a sophisticated micro-tension loop mechanism. These enhancements not only boost the rigidity of the mill and increase the rated power of the main motor but also introduce a rapid roll-changing device. Furthermore, at this stage, it is essential to adopt an electronic computer-based automatic control system to further improve process performance and achieve higher thickness accuracy.
With the maturation and widespread adoption of third-generation hot rolling technology, the development trends of continuous casting machines and walking-beam heating furnaces have converged, paving the way for advancements in the third-generation hot rolling mill itself. The associated regenerative burners boast exceptional heating capacity, effectively minimizing black spots caused by uneven heating and significantly reducing surface scratches on the slab.
Latest news
How to adjust the axial assembly of the rolling mill?
First is the mill’s entire radial adjustment mechanism. The key lies in utilizing a linkage formed by the connection between the sleeve and the universal coupling, a setup more commonly employed for external radial adjustments. It is precisely for this reason that both the lower compression nut of the bending pad and the compression nut itself are connected to standard screws and bearing housings.
2022-07-01
Introduction to Cryogenic Rolling
Low-temperature rolling involves heating steel billets to temperatures lower than conventional heating levels, followed by rolling performed at these reduced temperatures—more precisely referred to as medium-temperature rolling. The primary goal is to significantly cut down on fuel consumption required for billet heating and minimize metal burn-off during the process.
2022-01-18
Rolling Mill: What precautions should be taken when installing a small rolling mill?
Strict requirements apply when installing small rolling mills, as they do for rolling equipment in general—but there are still numerous differences between small mills and other types of machinery, making careful attention essential during installation. Due to the complexity of the electrical control systems in small rolling mills, which typically include one or more working stands along with their drive mechanisms, rolling lines often feature extended process layouts. Additionally, precise height differences between equipment and the central line are critical during setup.
2021-12-01
Steel Rolling Mill: The Purpose of a Steel Rolling Mill
There are two main types of steel rolling mills: cold rolling and hot rolling. Hot rolling is primarily used for roughing out the initial billets, while also producing certain types of structural steel. Notable models of hot-rolling mills include the 630–650 series, the 500–550 series, and the 2300 mid-plate mill. On the other hand, cold rolling is mainly employed for finishing and producing a wide variety of rolled strip products. Representative cold-rolled steel products include thin metal-coated sheets (such as tinplate and galvanized sheets), deep-drawing steel sheets (most commonly used in automotive applications), electrical silicon steel sheets, stainless steel, and coated steel sheets. Currently, advancements in both equipment technology and control systems are driving cold-rolling mills toward even higher levels of precision and efficiency. Examples of modern cold-rolling mill models include the 1400mm NKW, the 1250mm HC single-stand reversible mill, and the 1150mm twenty-roll cold-rolling mill.
2021-11-01
The Structure of a Short-Stroke Rolling Mill
With the development of the steel industry and rising customer demands for higher steel quality, the requirements for rolling mills are becoming increasingly stringent. Short-stress rolling mills stand out for their high rigidity, superior product precision, lightweight design, and ease of operation—particularly thanks to their innovative "on-line rapid mill changeover" feature, which has positioned them as a leading choice in steel rolling operations, especially in domestic bar and wire rod plants. Short-stress line rolling mills can broadly be categorized into frame-type and non-frame-type designs.
2021-10-08
Summary of the causes of heat generation in various parts of the steel rolling mill production line!
On the steel rolling mill production line, many equipment units—such as flying shears, pinch rolls, and low-voltage compensators—have adopted asynchronous variable-frequency drive systems for their transmission mechanisms. Once the magnetic field reaches saturation, the iron core becomes saturated, causing the no-load current to rise and, consequently, increasing the motor's heat generation. As a result, during summer months, companies often have to halt production for several hours each day just to allow the motors to cool down. This significantly disrupts the rolling mill’s output and inadvertently leads to substantial production cost losses. When the rolling mill processes steel, the motor speed naturally decreases, causing the stator current to surge by 10–22% above its rated value. Frequent overloading not only intensifies motor heating and overheating but can also, in some cases, lead to excessive resistance torque—potentially even stalling or burning out the motor altogether.
2021-09-01
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