The Development Of Rolling Process And Technology

The Development Of Rolling Process And Technology

The rolling technique improvement happening worldwide is mainly focusing on the following aspects: the optimization of the rolling process, the variety, and diversity of the rolling products, higher quality, and smarter management. The future of the rolling mill industry is as follows: 

Rolling-casting Integration

Traditional rolling machines with rollers can provide high-speed production rates with efficiency while still remaining controllable with high-tech equipment like computers. This kind of machine will keep dominating the market with its obvious advantages. However, the development of the rolling technique and the rolling mill is just in sight. In the 20th century, continuous casting has gradually eliminated the roughing process. With the thin steel plate it provides, the continuous casting process could just be integrated with the hot-rolling process. This rolling-casting integration improvement will optimize the whole rolling production process and make a further step in cost control. 

A Cleaner Rolling Process

In the whole hot-rolling process, the oxidation of steel leads to the waste of raw material and energy, more pollution, and further processing difficulties. Hence, the application of low-oxygen combustion techniques and low-cost hydrogen will become elementary to the no-oxidation heating process. With a brand-new acid-free cleaning(AFC) descaling technique, the product is smooth and completely oxide-free. This kind of improvement can give you a cleaner rolling process you’ve never experienced before. 

The Application of Cutting-edge Technology

What has driven the improvement of the rolling mill in the 20th century is the application of information technology. Automatic shape control of the steel plate, Free rolling, and High-precision, multi-parameter online tests, have all become available. And these techniques back fed the whole rolling mill industry. In the sight of the future, artificial intelligence will boost this industry to a brighter future.

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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 Explain Of Roughing Mill Process

The Explain Of Roughing Mill Process

Steel strips are produced by steel slabs in hot rolling mills. One part of the production process consists of reheating the steel slabs in a slab reheating furnace to a pre-defined temperature, usually between 1200℃ and 1300℃. After that, the steel strips are formed by the rolling slabs. The first mill of the steel slab goes through is the roughing mill. After the roughing mill, the slab's temperature between 1050℃ and 117℃, and the slabs should be called transfer bars. Then, the transfer bar goes through another few more procedures. Among all these processes, the most important two processes are finishing mills and cooling. Here is the detail of roughing Mill process below this paragraph.

The roughing mill consists of six independent rolling mill stands and four incorporated small vertical rolling mills called edgers at the end of it. Slabs are heated first reheating in the furnace until they glow bright orange-yellow, then they are rolled through one stand at a time to produce the so-called transfer bars in order to be suitable for finish rolling. High-pressure water-jet nozzles clean the oxidized iron, or scale, from the surface along the way.

At the end of the transfer bar where exits are the last roughing mill stand, the thickness of the leading edge of the bar is estimated. Similarly, a pyrometer measures the temperature of the bar from head to tail and there is a special camera photograph at both ends. In accordance with the gauge, width, and grade of the product to be rolled, the average temperature of the bar as it goes through the last roughing mill is usually between 1900° to 2100° Fahrenheit. All of these data are collected with the anticipation of finishing rolling. The Computer begins to calculate the speeds and gaps immediately for threading the six finishing mills, which will roll the steel in tandem with one another.

For another, the last four roughing mills each incorporate edgers for width control and roll the bar from five to six inches thick incrementally down to around an inch and a quarter, as a function of the customer’s demanded width, gauge, and steel grade. As we mentioned previously in this article, the third and fifth roughing mills each have high-pressure descaling headers operating at 1,500 psi. The individual roughing mills are spaced increasingly further apart to accommodate the lengthening of the transfer bars when they are rolled thinner and thinner.

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The Features Of Billet Continuous Casting Machine

The Features Of the Billet Continuous Casting Machine

The Features Of the Billet Continuous Casting Machine

The billet continuous casting machine belongs to one of the steel rolling mill machines.

Usually, the billet continuous casting machine is designed and manufactured according to the user’s demand. And it is used for continuously casting the square billet, the cross-section of which is 80×80, 100×100 or 120×120, 150×150 mm with a length of 6m/12m operated by an automatic control system. It contains single stand, double strands, and multiple strands CCM as well as a straightening machine, automatic cutting machine, billet cooling bank, billet spreader, molten steel spreader, and other auxiliary devices and facilities such as soft water treatment and water cooling system. CCM is a Continuous casting machine.

The Features of the Billet continuous casting machine are as follows:

The casting speed with high efficiency.

It has many different types of Multi-functional.

CCM equipment is always used in the steel rolling mill production line, a Continuous casting machine with high reliability and high ease of operation.

Billet continuous casting machine with a fast return on investment and low cost.

Continuous casting machine for steel with high technology.

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The Features Of Furnaces And Matters Need Attention

The Features Of Furnaces And Matters Need Attention

It is necessary that explain what is a furnace. According to Wikipedia: “A furnace is a device used for high-temperature heating. The name derives from the Greek word Fornax, which means oven.”

Also, there was a popular statement that a furnace is a device that is used to heat the material in order to exchange its shape as like in shaping and forging or the properties of the material can be changed. These furnaces are mostly used for melting the metals that are used for casting. The furnace can be termed as a type of oven. In addition, it is an enclosed structure inside, which makes the material heated at very high temperatures. It can be designed to perform water or air heating as well as circulated throughout a building in a heating system.

Furthermore, the way of a furnace design like this has its advantages and features, which as a way to consume fuel and heat as less as possible in a given time that would require low labor costs at first. Second is the apparent efficient features: The amount of heat that is to be given is prior determined to the material. 

Therefore, there exists a sufficiency in the liberation within the furnace heat of the required material. Proper heat and temperature would be successfully transferred from the gases to the surface of the heating stock take place.

What calls for special attention is that temperature should be uniform within the stock. Making the heat loss from the furnace needs to be minimized to the least.

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The Finishing Mill Group For High-Speed Wire-Rod Production

The Finishing Mill Group For High-Speed Wire-Rod Production

A rolling mill is a very useful machine manufactured by humans, one of its functions is to reduce the thickness of material quite accurately or compress the material to create wire rods, re-bar, cold coils, or other products.

At the same time, rolling mill machines are not standard machine tools, nor are they built for stock. They are built-to-order to specifically accomplish an end product or process.

During the industrial revolution in America, the United States led the world in hot and cold rolling, plate mills, slabbing mills, and blooming mills. So many years passed, and we still can see the contribution of this revolution time has made.

Nowadays, the steel rolling mill machine has made a very great improvement like the 135m finishing mill group researched by Hani Steel. 

The finishing mill group is the extra-heavy top 45° high-speed wire rod finishing mills designed for the high-speed wire rod production line. 

The finishing mill group is located in the high-speed wire rod workshop. Rolling by 10-unit rack continuous micro-tension rolling mill, rolling the ɸ17--ɸ21mm of rolled piece transported from upstream into ɸ5.5--ɸ16mm finished wire rod. The mill's guaranteed exit speed is 90m/s. ( when the specification of the finishing product is ɸ5.5mm).

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The Historical Background Of Rolling Mill Development

The Historical Background Of Rolling Mill Development

The earliest known rolling mill of metals was around the fourteenth century, its very small rolls were used to flatten cold metals such as gold, and silver, or used in jewelry or works of art. As well as we knew that Leonardo da Vinci describes in his notes machines for the cold rolling of sheets and bars in 1480, but it is unlikely that these mills were ever constructed. Until the last half of the sixteenth century, the cold rolling particularly began to take on more importance as lead, began to be used for roofing and other applications such as organ pipes.

The seventeenth century saw the hot rolling of bars of ferrous materials into thin sheets throughout Europe and especially in Germany, with applications later in that century in England and Wales. These mills were single-stand mills. It was not until the eighteenth century that metal was rolled in successive stands arranged as a tandem mill, the first record of which was for the hot rolling of wire rods in England in 1766, and in 1798 a patent was issued for a tandem mill for rolling iron plates and sheets.

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