The Cold Rolling Mill

The Cold Rolling Mill

In the article How Many Types of Rolling mill, we know that rolling is divided into two types that are hot rolling and cold rolling according to the different temperatures when metal is rolled. If the temperature is above its recrystallization temperature, then this kind of process is known as hot rolling. If the temperature is below its recrystallization temperature when mentally rolled, the process is called cold rolling.

While this article mainly talks about cold rolling. Cold rolling is fulfilled by making steel strips through plenty of tandem rolling mill stands. And each one of the stands has vertically stacked rolls that are powered by a huge motor to impart high compressive stresses into the strip. While hot rolling, pickled coils fed into the cold rolling mill from an entry-end reel and progressively reduced in thickness in each stand, to achieve the final desired thickness, as the strip exits the last stand. After the last stand, the strip recoiled. At this step, the strip is highly cold and not very useful for most applications. It needs to be annealed to soften the steel and make it more formable. 

Another method of cold reduction needs to use of a reversing mill. In this process, the strip is passed back and forth between mandrels on each side of a single or two-stand mill. The strip is reduced in thickness on each pass until the final required thickness is attained. The typical percent cold reduction ranges from 60 to 80 percent; such reducing a hot rolled strip of 0.100-inch thick to a 0.030-inch thickness results in 70 percent cold reduction.

The Development Of The Steel Industry In China

The Development Of The Steel Industry In China

The development of the steel industry in China closely relies on other industries and shares mutual encouragement with them. Other industries like manufacturing, construction, and transportation have had higher demands for the quantity, variety, and quality of steel materials while they are looking for a leap forward. To meet their requirements, steel enterprises got to have a positive attitude and must seek an opportunity to develop their products like non-quenched and tempered steel, silicon steel, structural steel with fine mechanical properties, and other various sheets of steel applied to different industries to provide low-cost, environment-friendly materials with high-standard performances and lead their way in the rapid development.

In order to develop cutting-edge products, new treatment processes, equipment and techniques are essential. Domestic scientists and engineers have made some major breakthroughs in the new-generation automotive steel, flexible retreat technology for cold rolling, and advanced coating techniques and products. These achievements have boosted the development of revolutionary products and China’s national economy. As a crucial premise and foundation, experiment research can lead to a new process and technique innovation. Hence, strengthening the construction of research institutes and setting up its own hardware, software technology, and product development platform is critical while establishing a combination system of production and research technology innovation. The application of new techniques, new steel technology, and new steel products are just down the road.

With the global competition in the steel business growing fiercely, the market has got higher and stricter requirements for the quality and quantity of its product. The traditional rolling force calculation formula will fade and be replaced by a more ideal design method with higher accuracy -- mathematical models. It is incredibly difficult to analyze the rolling process with all kinds of factors influencing the whole procedure. The application of mathematical models like neural networks can deal with this problem. They can predict accuracy and improve the level of production control by quantitatively and qualitatively optimizing the production process to provide low-cost optimization strategies for the steel industry.

As an upcoming technology, the soft computation was applied to optimize the design of the rolling system. To solve the uncertainty and ambiguity in practical problems, the combination of human knowledge and solution methodology comes in handy, including evolutionary computation, fuzzy logic, neural computation, and probability computation.

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The Main Tendency And Features Of Rolling Mill

The Main Tendency And Features Of Rolling Mill

Since the 1960s, with the development of iron-making and steel-making technology and the progress of the mechanical and electrical industry; with the wide application of computer automatic control technology and advanced science and technology, the production of steel rolling technology has made leaps in the growth and development. In a word, the main tendency and features of its development as the following:

1. The production process of strip and wire rods is continuous in the recent 20 years and would be more perfect if the continuous tube rolling mill and section continuous rolling mill came into being. And there are new types of rolling mills that were invented such as endless rolling, which is a completely continuous rolling production line. Including electric release ‘fat, annealing, cooling, k and coiling' process of finishing the rolling mill line also appeared in recent years cause of the widely applied wire rod mill in cold rolling belt californium and continuous welded pipe, which has greatly increased the production efficiency.

2. The constant improvement of rolling speed and the continuous production process created the condition of increased operating speed. All kinds of rolling mill speeds increased, Over the past 20 years. The Current wire rod rolling speed has reached 100 meters per second, cold rolled strip speed at 41.7m/s, and steel tube tension reducing speed up to 20 meters per second. And with the development of continuous automation, a variety of operating speeds will be increasing continuously. 

3. Production process automation is improving at all levels not only the important factor of production capability increased by technology and science but also the important prerequisite for improving product quality, labor-saving, and reducing consumption. The electronic computer developed after the 1960s has been applied more widely, especially the strip rolling has made the most full use of it. The currently used multi-level computer control system not only realizes the process control and digital direct control but also makes the computer technology applied by enterprise management. Many factories are expanding the electronic computer automatic control technology to the steel material finishing, heat treatment, nondestructive, and so on.

All in all, the increasingly large scale of iron-making and steel-making production capacity is bound to expand the rolling production scale. 

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Email: stella@hanrm.com   stellarollingmill@gmail.com

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What Is Cold Rolling Mill ?

What Is Cold Rolling Mill ?

What is cold rolling? I believe people who will be very interesting in "What is Cold Rolling"?  

If the temperature is below its recrystallization temperature when mental rolled, the process is called cold rolling. 

Cold rolling is fulfilled by making steel strip through plenty of tandem rolling mill stands. And each one of stands has vertically stacked rolls that are powered by a huge motor to impart high compressing stresses into the strip. 

Cold-rolling mills can produce various products like the smooth tin plates flowing like water, shiny galvanized plates glittering like mirror and other colorful coated sheets. They can then be pressed into cans or applied on industrial machines and household appliances or even just for decoration. 

What rolling mills do are not just limited to those plates. Rods, bars, wires, rails... You name it. All these productions can be easily achieved just like the plates with rollers in different shapes. 

With the emergence of new technologies in this field, it’s not hard for us to believe that the rolling mills in the future will be smarter and much more powerful. The application of those new technologies will lead us to cost reduction, quality insurance and the improvement of competitive abilities. 

Please contact stella@hanrm.com for a quotation.
And free send inquiry to us.
Email: stella@hanrm.com   stellarollingmill@gmail.com
Whatsapp/Wechat:+8615877652925