What Is Steel Rolling Mill Machinery?

What Is Steel Rolling Mill Machinery?

The steel rolling mill machinery is a mechanical device that realizes the metal rolling process. It refers to the equipment that completes the whole process of rolling material production, including main equipment, auxiliary equipment, lifting transportation equipment and auxiliary equipment.

Steel rolling mill machinery can be divided into two parts: main rolling mill equipment and rolling mill auxiliary equipment.

Steel Rolling Mill Machinery Main Equipment

The main equipment of the steel rolling mill machinery includes the main motor, the working machine base and the main transmission (reducer, gear base, coupling, coupling shaft, etc.).

The steel rolling mill machine working machine seat is composed of a roll, a roll bearing, a frame, a rail seat, a roll adjusting device, an upper roll balancing device and a roll changing device.

Steel Rolling Mill Machinery Auxiliary Equipment

Auxiliary equipment for steel rolling mill machinery includes:

Transport equipment, such as the roller conveyor for longitudinal transport of rolled products, the lifting platform for transporting rolling stock in the vertical direction, and the steel pulling machine and steel moving machine for transversely transporting rolled stock.

Processing equipment, such as shearing machines (flying shear, gripping shear) and hot saw machines for cutting rolled products, straightening machines for straightening rolled products, and coilers for taking up rolled products.

Other finishing equipment, such as a steel turning machine for reversing rolling stock, a rotary table for revolving rolling stock, and a cooling bed for cooling rolled products.

And various mechanical equipment used in the processes of collection, pickling, printing, packaging, etc.

In general, the higher the degree of mechanization, the greater the proportion of auxiliary equipment weight to the total weight of the rolling mill workshop machinery.

Therefore, the degree of application of auxiliary equipment is also one of the important signs of the degree of mechanization of the rolling process.

Since 1989 Hani Tech has been always involved in design, engineering, manufacturing and installation of complete hot rolling mill plant for long products (re-bars, SBQ bars, wire rod, small and medium sections), as well as revamping and upgrading of existing plants. 

Hani Tech is the one-stop manufacturer & supplier able to design, manufacture, install and commission your hot rolling mill plant from A to Z.

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

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Characteristics of Forged Steel Cold Rolls (Cold Rolling Work Rolls, Cold Rolling Intermediate Rolls)

Characteristics of Forged Steel Cold Rolls (Cold Rolling Work Rolls, Cold Rolling Intermediate Rolls)

 

1. Carbide Hardness is High.

The cold rolling work rolls and cold rolling intermediate rolls used in the past are mostly Fe3C type or M7C3 type eutectic carbides distributed on the substrate, and the structure is coarse and the hardness is low. Forged steel cold rolls generally use high-C, high-V high-speed steel, and also contain more alloying elements such as Cr, Mo, W, Nb, and Co. These alloying elements are formed once and twice during solidification and heat treatment. carbide. The high chromium cast iron roll carbides are M7C3 (2500 Hv) and M23C6 (1600 Hv). In the infinite chill cold-rolling work roll and the cold-rolled intermediate roll, the carbide is Fe3C (l300 Hv). The forged steel cold roll mainly contains MC (3000 Hv), M7C3 (2500 Hv), and M6C (2000 Hv), which can replace the ordinary cold rolling work roll and cold rolling intermediate roll, thereby improving the wear resistance. In addition, as the V content increases, the skeletal M6C type carbide in the high-speed steel structure is converted to the granular VC type.

2. Good Thermal Stability.

The forged steel cold roll contains more elements such as W, Cr, Mo, V, and Nb, and has good thermal stability. It is found that the hardness of the ordinary roll material decreases significantly with the increase of temperature, while the forged steel cold roll Maintaining 500 Hv at 600 ° C will greatly improve the wear resistance of the rolls. This tendency is more pronounced especially when the Co element distributed in the matrix structure is added.

3. It is Easy to Form an Oxide Film During Use.

In the rolling process, if a continuous, dense, uniform, and good adhesion oxide film is formed on the surface of the roll, the friction coefficient between the roll and the rolled material can be reduced, and the dimensional accuracy and surface quality of the rolled material can be improved. Ordinary rolls are worn at an early stage due to the absence of oxide film protection and wear. In the use of forged steel cold roll, the oxide film can be formed quickly, and the appearance of the oxide film can reduce the friction between the strip and the surface of the roll, prevent the roll from sticking to the steel, and improve the life of the roll. Compared with ordinary rolls, the initial wear of the forged steel cold rolls is lower, which is very advantageous for improving the wear resistance of the forged steel cold rolls.

4. Good Hardenability.

The forged steel cold roll has good hardenability. At room temperature, within 50mm of the working layer, the hardness drop from the surface of the roll to the core is less than 3HS, which ensures that the roll has good wear resistance from the outside to the inside.

5. Excellent Strength and Toughness.

Compared with general infinite chilled cast iron, high chromium cast iron, and semi-steel rolls, the forged steel cold roll has better basic mechanical tensile strength and fracture toughness than high chromium cast iron rolls and infinite chilled cast iron rolls, and semi-steel. The rolls are close.

6. Good Resistance to Thermal Cracking.

High-speed steel can effectively inhibit the formation and expansion of cracks due to its unique structural characteristics. In actual use, it has been found that forged steel cold rolls do have better thermal crack resistance than high chromium cast iron rolls. Therefore, in the event of a general production accident, the impact of the accident can be eliminated by normal grinding or by adding a small amount of grinding, which simplifies the process and saves costs.

7. Good Wear Resistance.

Compared with semi-steel, high-chromium cast iron, and high-nickel-chromium infinite chilled cast iron rolls, the tonnage of forged steel cold roll rolling is greatly improved, the F1-F4 frame is about 10000t, and the F5 frame is about 6000t, showing forged steel cold. The rolls have good wear resistance. The increase of tonnage of forged steel cold roll rolling results in a significant decrease in roll consumption. Under the same rolling conditions, the roll consumption of forged steel cold roll is 1/5 of that of high chromium cast iron roll in F1 frame, and F2 frame is high chromium. The 1/7, F4 frame of the cast iron roll is 1/13 of the high nickel-chromium infinite chill cold work roll and the cold roll intermediate roll, and the F5 frame is 1/8 of the high nickel-chromium infinite chilled cast iron roll. 

Free send inquiry to stella@hanrm.com or Stellarollingmill@gamil.com if any needs.

Whatsapp/Wechat:+8615877652925

Website:  https://www.hanrm.com

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Technical Types of Endless Rolling of Bar and Wire Rolling Mill

Technical Types of Endless Rolling of Bar and Wire Rolling Mill

Headless rolling has a series of obvious advantages, such as high production efficiency, improving dimensional accuracy by reducing the loss of cutting head and tail to improve the yield, overcoming the dimensional deviation of the head and tail of the rolling piece, reducing the impact of the head and tail of the rolling piece on the motor, transmission system, roll, guide guard and reducing accidents. It is highly praised and researched by the steel rolling workers.

At present, there are two kinds of endless rolling technology for bar and wire rolling mill :

1. EWR Headless Rolling Technology

It is to cut off the slab first, then heat it, and then weld the front and back two billets (rolled pieces) end-to-end after the furnace is discharged, or after the roughing mill, so as to realize headless rolling. The technology of endless rolling by welding is called EWR, which was developed and first applied by Japanese manufacturers. China Tanggang, Xinggang, Bagang, etc. have tried it.

EWR headless rolling technology first cut off the slab which was originally headless and tailless, and then weld it into a workpiece that is headless and tailless. This is really a helpless move to solve the speed mismatch between the caster and the rolling mill.

This process not only enjoys many advantages of endless rolling but also brings a series of difficult problems. First of all, the complexity of welding equipment and the increase of accident points affect the operation rate in the early stage of commissioning. After short-term trial use, Tang steel, Ba steel, and other manufacturers gave up their efforts to further improve the technology and returned to the original single rolling operation mode, which affected other manufacturers' views on the EWR headless rolling process, which made the later ones flinch.

2. Luna Headless Rolling Process

One is Luna headless rolling developed by Danieli company in Italy, which has been applied in Udine company in Italy. It is characterized in that the billet caster and the continuous rolling mill are directly connected in a production line, the billet is not cut off, and the direct rolling is realized after induction heating in the tunnel furnace. After rolling, it is cut to a fixed length for cooling and subsequent treatment.

Compared with the EWR process, Luna's headless rolling process avoids the embarrassment of cutting and re-welding, which is a major technological innovation in the field of bar and wire rod production and represents the future development direction of rod and wire production technology. However, the disadvantage of the Luna process is that it still needs to use a longer tunnel furnace for induction heating, and its construction cost and operation cost are high.

Generally speaking, there is still a need for further research on the endless rolling technology of bar and wire rod rolling mill.

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

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Automatic Control Analysis of Bar Continuous Rolling Flying Shear

Flying Shear Start Control

Before rolling, the engineer's station personnel passed the screen set to transfer the cut and cut the size of the flying shear to the PLC. When the HMD detects the steelhead or steel tail signal before the shear, the detection signal is sent to the PLC that controls the scissors, and the scissors PLC then according to the line speed of the rolling piece passed by the basic PLC, the last cut of the scissors The error, and the set length of the cutting head and the tail length, calculate the flying shear start delay time. When the delay time is up, the start command of the flying shear is issued immediately, and the cutting function of the flying shear is completed. For the shredding function of the scissors, the manual start control is adopted, and the operation table manually breaks according to the accident. The shredding function of the scissors takes precedence over the function of cutting and cutting.

Rolling Steel Simulation Analysis Function

When the hot test run is not set at the production site, in order to comprehensively evaluate the linkage effect of each device, it can be completed by cold adjustment; when it is judged whether the cascade blocking function is normal, it can be analyzed by the automatic control model; When it is reasonable, it can be operated in a targeted manner, which shortens the trial hot car time to some extent. At the same time, under the action of rolling steel simulation analysis function, online simulation analysis is realized, and through the continuous improvement of offline simulation function, it provides necessary reference information for the development of transmission inverter equipment program. When the PLC is connected correctly, all module performance can be tested in real-time.

Bar Speed Correction

The rolling speed of the bar is the basis for control and the key to controlling the accuracy of the cutting, so the estimation of the speed of the rolled bar is particularly important. When the calibration function is activated, the speed of the bar is corrected. The speed of the rolled material is generally calculated by the mill control system based on the roll diameter, roll profile and motor type, due to elastic strain and rolled material at the stand roll. The actual reduction on the amount, the calculated value may not be consistent with the actual value. The actual speed is estimated by measuring the elapsed time of the end of the bar from the HMD before the flying shear to the time after the HMD. Alternatively, the flying shear performs shearing, and the measurement starts from the interlacing of the blade to the cutting. The time at which the end reaches the HMD downstream of the flying shear. The ratio of the distance between the HMDs and the measured time gives an estimate of the average speed of a bar during operation. A speed calibration factor is obtained relative to the average of the speeds calculated by the mill control system at the same interval. The speed received from the mill control system becomes a speed calibration factor, thereby obtaining the best estimate of the actual speed of the bar during shearing.

Flying shear Zero Compensation Control

After the end of a cutting process, the flying shear must be accurately parked at the zero position to prepare for the next cut. The zero detection of the flying shear is calibrated by the proximity switch. However, in practice, there is a certain error in the stop position from the original zero points. The error must be compensated to ensure that the speed of the scissors is accelerated to the set shear speed within the specified distance to meet the shear torque requirement. For this purpose, the position of the cutting edge is detected using the positioning code dial. The code wheel adopts 2048 two-phase orthogonal pulse. Each rotation of one wheel, the code wheel count is 0-8192, corresponding to the cutting edge angle of 0-360 degrees so that the angle of the scissors from the zero position can be calculated by counting the pulse of the code wheel. By this value and the angle between the zero point and the shear point, the initial angle of the flying shear can be calculated. Since the code wheel can achieve high precision and can effectively suppress the counting error caused by the vibration, the next cutting edge can be accurately compensated for the next cutting edge error.

In summary, the application of the bar shear system, the main technical performance indicators such as shear accuracy, shear section quality, shear response speed and optimized shear reliability can meet the on-site process requirements, in the rolling mill room Under the premise of normal cascading relationship, stable rolling mill speed and normal operation of all detecting components, the absolute value of the positive and negative shear length of the shearing length generally does not exceed the maximum linear velocity (m/s) of the rolling line multiplied by 5 milliseconds. The application of the automation control system has improved the production level to a certain extent, which is an inevitable trend in future development.

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Advantages of Hot Rolling Mill

Advantages of Hot Rolling Mills

According to the hot rolling mill manufacturer, the rolling mill is indispensable equipment in modern metal rolling, and we can use two different methods. For example, you can choose hot rolling or cold rolling. Obviously, the two methods are relative.

In fact, what we mean by hot rolling is mainly a process in which rolling is completed above the recrystallization temperature. Roll mill professional manufacturers believe that the use of hot rolling can enjoy some benefits, then, do you know the main advantages of which? Let's take a look at the main content of this aspect.

The mill manufacturer explained that the advantages of the hot rolling mill can be summarized into three aspects. First, the use of hot rolling can significantly reduce energy consumption and reduce costs. In addition, high-metal plasticity can be exerted during hot rolling, and the deformation resistance generated is small, and the metal can be effectively prevented from being severely deformed.

According to the rolling mill manufacturer, the second advantage of using hot rolling is that it can properly improve the processing performance of metals and alloy materials. That is to say, it can crush larger crystal grains and reduce the occurrence of cracks, which is equivalent to reducing defects in the casting process and improving the processing properties of the alloy.

The last advantage is that the hot rolling process is more conducive to continuous and automated. The rolling mill professional manufacturer explained that in this process, we generally use large ingots to reduce the amount of rolling, so it can also improve the efficiency of the work while creating favorable conditions for increasing the rolling speed.

The above is the main advantage of the use of hot rolling by the rolling mill professional manufacturers. I believe that everyone has a clear understanding of this content.

Purchasing Rolling Mill Equipment Quality Priority

Priority Should be Given to Quality When Purchasing Rolling Mill Equipment

Such important processing equipment as rolling mill must be carefully considered when purchasing. Of course, many users will pay more attention to the price first, but also need to consider the quality of the equipment as much as possible.If conditions permit, it is best to visit the rolling mill manufacturer for consideration, so as to see the manufacturing technology of the equipment manufacturer, and also to ensure that the equipment purchased can be put into use after installation.

In fact, when selecting and purchasing rolling mills, the quality and performance of the equipment should be considered first. Because of the quality is not guaranteed, there may be a lot of unnecessary troubles in the later use period, and even may lead to unusable, so we need to give priority to the quality of products, and then choose.

At the same time, the selected new mill also needs to comply with the relevant requirements when it is installed. There are many differences between different rolling mills, so it is necessary to carefully read the instructions for the use and installation of the equipment when installing.Especially when the electronic control system is installed, special attention should be paid to it. Because of the long process layout of rolling line, the requirements of the mutual elevation difference and centerline between the equipment are stricter.

In addition, in the installation operation, it is necessary to select the appropriate installation location. If equipment on rolling line is installed on soft ground, the uneven settlement and displacement of equipments need to be taken into account. This is also the reason why the equipments need to bury the settlement observation points on the basis of central benchmark, datum point, and rolling mill before installation, and make regular measurements. Only when the settlement and displacement become stable can the equipment be adjusted accurately.

In addition, in the work of rolling mill, due to the heavy load, special attention should be paid to the selection of suitable roller bearings. Usually, the mechanical properties of hot rolling mills are better than those of rolling mills, and the properties of steel products are naturally better.