The Application Of Flying Shear

The Application Of Flying Shear

The Flying Shear is a common industrial application in rolling mill production lines for cutting a product into smaller lengths, without stopping the line, this means that the main production process is not interrupted, and so machine productivity is maximized.

The cutting tool is typically mounted on a carriage that moves either parallel to the product flow or at an angle across the product flow. The flying shear drive accelerates the carriage to synchronize with the line speed, while synchronized the cut is done and the carriage then decelerates and returns to its original position ready to cut again. There are also many other similar applications where a carriage must be synchronized at line speed and most of these can also be accommodated using the flying shear application software.

Typical applications include various types of cut-to-length machines, depositors, punches, product inspection, or any other process where synchronization at line speed is required.

A machine extrudes plastic pipes that must be supplied to the customer in pre-cut lengths. The extrusion process requires the extruder to run at a continuous speed to maintain the quality of the product. The pipe is uniform along its length and provided the length is within a set tolerance then the pipe is fit for sale. The flying shear is used to cut the product cyclically.

The actual design of the machine that we observed in the mill was very large in size and it cut the hot billets of diameter 1\2 inch to 1 inch and length will be in several meters and it cost thousands of dollars we cannot make this machine as FYP. So according to the situation, we had to design a machine of a small size to cut something other than a hot billet. We chose the design of the printer as a model as the design idea was similar to the printer and select copper wire as a job. The sketch will be shown below.

The Concept And Process Of Rolling Mill

The Concept And Process Of Rolling Mill

Steel is widely used in our daily lives and holds a critical position in the national economy and most of the steel products we need are produced by rolling mills. The rolling process plays an important role as the final link of the steel-making process in modern steel enterprises.

Steel rolling, as its name, is a process of shaping the steel billet with rollers. And the rolling mill is what you need to get the job done. The complete rolling production process contains a series of different rolling techniques and it can be complicated. However, despite all those various requirements, the basic production process always contains the following procedures: reheating the steel billet and further treatments, rolling process, and the final finishing rolling process.

When the billets arrive, they need to be treated with chemicals like acids to remove the oxidation film and the obvious defects on the surface must be removed too. Then the billets will be reheated to a certain temperature to be ready for the coming rolling process. The rolling process is the core of this whole production, the billets will be rolled into different shapes and the rolling technique is crucial for the quality of the final product. It must meet the requirements from three different aspects: the product’s geometry dimension accuracy, internal organization, and performance, and clean and smooth surface. 

After all these processes, the product still has a complicated finishing rolling process. As a guarantee of the product, the finishing process can be different for the various requirements and standards. After the cooling, straightening, heat treatment, and other certain process procedures, the final product will meet all those customized requirements.

Please contact stella@hanrm.com for a quotation.

And free send inquiries to us.

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

Whatsapp/Wechat:+8615877652925

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.

Please contact stella@hanrm.com for a quotation.

And free send inquiries to us.

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

Whatsapp/Wechat:+8615877652925

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.

If you are interested in any of our products, pls feel free to contact stella@hanrm.com.

Please contact stella@hanrm.com for a quotation.

And free send inquiries to us.

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

Whatsapp/Wechat:+8615877652925

The History Development Of Rolling Mill

The History Development Of Rolling Mill

Hot and cold rolling mill between two or more rolls has been in existence since long before the industrial revolution. As a matter of fact, Leonardo da Vinci was credited for the metalworking mill prior to his death in 1519.

When most people think of a rolling mill, they visualize sizable machinery in ferrous (iron, carbon steel, and stainless steels) and non-ferrous (copper, brass, lead, etc.) integrated or electric arc furnace (EAF) steel mill of today, to small manually cranked rolling devices used at jewelers to reduce the thickness of the precious metal or impart a pattern on the surface of the metal to be fabricated into a chain or ring.

Rolling mills have many functions. They can be used to reduce the thickness of material quite accurately (+/-.0001”) or compress the material to create a uniform density throughout the strip or import a surface finish on one or both sides of the material, just to name the most common methods.                    

Rolling mills are not standard machine tools, nor are they built for stock. They are designed and built to order to specifically accomplish an end product or process.

At one point during the industrial revolution in America, the United States led the world in hot and cold rolling, plate mills, slabbing mills, and blooming mills. Companies such as Mesta, United, Blaw-Knox, Lewis, Continental, and Bliss were attributed to building some of the largest rolling mills in the world before World War II.

Many of these old mills are still running today as a result of upgraded electrical and hydraulic systems, including hydraulic screwdowns, hydraulic roll bends, and tension control.

Please contact stella@hanrm.com for a quotation.

And free send inquiries to us.

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

Whatsapp/Wechat:+8615877652925

The History Of Rolling Mills

The History Of Rolling Mills

Hot rolling mills and cold rolling mills of metalworking between two or more rolls have been in existence since long before the industrial revolution.

When most people think of a rolling mill, they visualize sizable machinery in ferrous (iron, carbon steel, and stainless steels) and non-ferrous (copper, brass, lead, etc.) integrated or electric arc furnace (EAF) steel mill of today, to small manually cranked rolling devices used at jewelers to reduce the thickness of the precious metal or import a pattern on the surface of the metal to be fabricated into a chain or ring.

Rolling mills have many functions. They can be used to reduce the thickness of material quite accurately (+/-.0001") or compress the material to create a uniform density throughout the strip or impart a surface finish on one or both sides of the material, just to name the most common methods.

Rolling mills are not standard machine toll, nor are they built for stock. They are designed and built to order to specifically accomplish an end product or process.

At one point during the industrial revolution in America, the United States led the world in hot and cold rolling, plate mills, slabbing mills, and blooming mills. Companies such as Mesta, United, Blaw-Knox, Lewis, Continental, and Bliss were attributed to building some of the largest rolling mills in the world before World War II. In fact, Mesta and United pioneered the rolling process to reduce very thick as cast slabs into the plate, the plate into hot rolled coils and cold rolled coils.

Many of these old mills are still running today as a result of upgraded electrical and hydraulic systems, including hydraulic screwdowns, hydraulic roll bends, and tension control.

Please contact stella@hanrm.com for a quotation.

And free send inquiries to us.

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

Whatsapp/Wechat:+8615877652925

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. 

Please contact stella@hanrm.com for a quotation.

And free send inquiries to us.

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

Whatsapp/Wechat:+8615877652925

The Rolling Mill Laser Cladding Technology

The Rolling Mill Laser Cladding Technology

The rolling mill laser cladding technology is a brand new surface strengthening technique that heats the powdered alloy or ceramic and the surface of the substrate to fuse them and cover the substrate with a less-dilution metallurgically bonded coating after the removal of the laser. This new type of treatment can improve the surface properties of the material like wear resistance, corrosion resistance, heat resistance, and oxidation resistance, along with its electrical characteristics. The ordinary 60# steel can reach a hardness high as 2200HV after being laser clad with tungsten carbide and perform 20 times better in wear resistance. The wear resistance of the Q235 steel laser clad with CoCrSiB alloy is also better than the flame-spraying ones.

As an advanced economically beneficial technology, laser cladding can cover low-cost metal substrates with high-performance alloy coatings without changing their original properties and reduce the cost of rare metals. Every industrially advanced country in the world is paying great attention to related research.   

The superiority of rolling mill laser cladding technology can be reflected in the following aspects:

 1. High cooling velocity (106K/s). Fine-grained micro-structures and rare phases like unstable phases and amorphous phases that could not be formed under common conditions can be easily gained with this fast solidification process.

2. Low dilution rate (less than 5%). The metallurgical bond between the coating and the substrate, and the Interface diffusion bond can be controlled with the technical parameters of the laser to obtain an excellent low-dilution coating with adjustable compositions.

3. Less thermal input and distortions. The distortions can be controlled within the range of tolerance, especially when it’s been laser clad with high power density.

4. Unrestricted coating powders, especially when cladding the fusible metal substrates with refractory alloys.

5. Large coating ranges. The thickness of the coating can vary from 0.2 to 2.0mm with one single powder feed.

6. Regional cladding with superior cost efficiency.

7. Flexible beam-aiming cladding to the inaccessible areas.

8. Easily automated and totally fit for the repair of common abrasions. 

The rolling mill laser cladding technology can also be used in the wear resistance and corrosion resistance fields for its large range of applicability which covers almost every aspect in the machinery manufacturing industries, such as coal, petroleum, electricity, railway, automobile, and aviation. Take the petroleum industry as an example, a large number of equipment like valves, centrifugal pumps, oil pumps, plunger pumps, screw pumps, and compressors breaks down every year. These units are expensive and various in type, which makes them hard to repair. But it won’t be a problem anymore with the help of laser cladding technology.

Please contact stella@hanrm.com for a quotation.

And free send inquiries to us.

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

Whatsapp/Wechat:+8615877652925

The Solution For Slower Start-Up Speed Of Rolling Mill Machine

The Solution For Slower Start-Up Speed Of Rolling Mill Machine

The speed at which the rolling mill machine is started during operation has an important effect on the efficient operation of the rolling mill. If the rolling mill machine is slow to start when it is ready for operation, it indicates that the rolling mill has obvious defects in performance, which will seriously affect the working efficiency of the rolling mill. The force between the blank or the rolled stock and the roll also does not reach a good condition.

The rolling stock cannot be fully rolled in the rolling mill. In this case, the power consumption of the rolling mill is several times higher than usual. If this happens frequently, the speed of the rolling mill is not effective when it is turned on. Increasing the efficiency of the billet or the rolled piece will lower and lower. For the rolling mill machine, if the rolling mill is not capable of rapid overload start, the billet rolling speed will be too slow, and Hani Tech will analyze it. The reason why the rolling mill machine startup speed is slow. 

Before starting the rolling mill machine, first check the motor power, rolling speed, product specifications, hole type process, etc., to ensure that the blank load capacity does not exceed the bearing capacity of the rolling equipment, otherwise the equipment start speed will be slower. There is also a need to check the bearing of the rolling mill to see if the lubrication of the bearing is sufficient. If the lubrication is not enough, the start of the rolling mill machine will be slower or even malfunction.

Please contact stella@hanrm.com for a quotation.

And free send inquiries to us.

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

Whatsapp/Wechat:+8615877652925

The Structure Of Rolling Mill

The Structure Of Rolling Mill 

A rolling mill has a common construction independent of the specific type of rolling being performed:

· Work rolls

· Backup rolls - are intended to provide rigid support required by the working rolls to prevent bending under the rolling load

· Rolling balance system - to ensure that the upper work and backup rolls are maintained in proper position relative to lower rolls

· Roll changing devices - use of an overhead crane and a unit designed to attach to the neck of the roll to be removed from or inserted into the mill.

· Mill protection devices - to ensure that forces applied to the backup roll chocks are not of such a magnitude to fracture the roll necks or damage the mill housing

· Roll cooling and lubrication systems

· Pinions - gears to divide power between the two spindles, rotating them at the same speed but in different directions

· Gearing - to establish desired rolling speed     

· Drive motors - rolling narrow foil product to thousands of horsepower

· Electrical controls - constant and variable voltages applied to the motors

· Coilers and uncoilers - to unroll and roll up coils of metal

Slabs are the feed material for hot strip mills or plate mills and blooms are rolled to billets in a billet mill or large sections in a structural mill. The output from a strip mill is coiled and, subsequently, used as the feed for a cold rolling mill or used directly by fabricators. Billets, for re-rolling, are subsequently rolled in either a merchant, bar, or rod mill. Merchant or bar mills produce a variety of shaped products such as angles, channels, beams, rounds (long or coiled), and hexagons.

Please contact stella@hanrm.com for a quotation.

And free send inquiries to us.

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

Whatsapp/Wechat:+8615877652925

What Are The Advantages Of The New Design Rolling Mill Equipment?

What Are The Advantages Of The New Design Rolling Mill Equipment?

What are the advantages of the new design rolling mill? What are the special rolls equipped?

As we know that in the process of improving the rolling mill equipment, its structure design has been obviously optimized and upgraded. So do you know what new advantages this rolling mill has after new design improvements? In fact, one of the most attractive aspects of the new equipment is the flexible adjustment of rolling speed.

In this way, in actual production, the working performance of rolling mill equipment will be brought into full play, which is also the basis of realizing automation and continuous operation. Of course, it also has many other advantages, such as when the latest design and production equipment in the production process can also ensure the tensile strength of finished steel bars, but also can greatly improve the elongation of broken steel bars and the maximum total elongation, and further improve the mechanical properties of products, to overcome the problem of low ductility of cold-rolled steel bars.

In addition, after improvement, the current rolling mill equipment adopts the passive one-rolling and one-towing production mode, which can realize two-pass rolling. It not only solves the problem of speed matching but also changes the traditional four-pass rolling mode and improves production efficiency significantly. At the same time, the automatic control calculation is flexibly applied to ensure that the product appearance size is accurate and the surface quality is excellent.

From the above introduction, we can see that continuous innovation and improvement will be able to further improve the performance of rolling mill equipment on the basis of the past. At the same time, it also significantly improves the quality of finished steel products, while improving production efficiency, bringing maximum benefits to customers. So, do you know what special rollers are equipped with them? In fact, rolls are very important components for any rolling mill equipment.

Even some rolling mills are equipped with special rolls to meet these special rolling requirements. For example, cemented carbide rolls, which are pressed and sintered with tungsten carbide powder, are suitable for high-speed rolling because of their excellent wear resistance. This roll is usually used in high-speed wire rod mills.

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

What Are The Common Shearing Machine Of Rolling Mill?

What Are The Common Shearing Machine Of Rolling Mill?

There are many kinds of shearing machines used in rolling mill workshop. According to the shape and configuration of shearing blades and the shape of rolling pieces, the shearing machine can be divided into parallel blade shearing machines, inclined blade shearing machines, disc shearing machines and various types of clippers.

The two blades of the parallel blade cutter are parallel to each other and are characterized in that both cutting edges are in contact with the metal being sheared at the same time. The shearing process is completed in a short time, the shearing efficiency is high, and the shearing machine is subjected to large load. It is commonly used for transverse hot shearing of rolled blanks (squares, slabs) and other square and rectangular section billets.

The two blades of the oblique blade cutter are angled, generally, the blade is inclined and the lower blade is horizontal. These shears are commonly used for cold shearing and hot shearing of steel sheets, steel strips, thin slabs, welded tube blanks, and sometimes for cutting small steel product.

The blades of the disc shear are made into discs. There are two types of disc shears used in the rolling mill workshop: one for longitudinal shearing of steel sheets and strips; and one for cutting heads of small steel product or wire production. Their common feature is the completion of the shearing task during the running of the steel by rotating pairs of disc cutting edges.

Flying shears are mainly used for sharing moving rolling stock transversely. Flying shears are used in section steel production, billet production, and steel sheet production. The cutting task is completed during the running of the steel, and thus the running speed of the steel is required to be substantially the same as the peripheral speed of the cutting edge. Most of these shears are placed on the line of semi-continuous or continuous mills.

Recently, in order to solve the problem that the shearing load is large, the walking beam shearing machine has appeared. The shearing process of this type of shear is performed in stages. In the above-mentioned various types of shearing machines, the eccentric shaft rotates one turn or less than one turn to complete one shearing action, while the walking beam shearing machine rotates the eccentric shaft into several turns to complete a shearing action. The eccentricity of the eccentric shaft on the step shear is small (usually 5~10mm). The walking beam shearing machine uses a set of stepping mechanisms to continuously change the position of the table to complete the entire cutting process.

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

What Are The Requirements For Rolling Mills For Lubrication?

What Are The Requirements For Rolling Mills For Lubrication?

Rolling mills requirements for lubrication:

Grease lubrication: such as the input ramp of the furnace in the hot strip mill, the pusher, the discharger, the stand, the stand, the mill ramp, the mill work, the motor bearing, the mill press, the universal joint shaft Grease with bracket, cutting machine, looper, guide, output ramp, tumbling machine, coiler, washing machine, turning machine, shearing machine, disc cutter, edger, boring machine, etc. lubricating;

Lubricating oil adopts circulating lubrication: For example, Baosteel 2030 five-stand cold rolling mill is an example, strip steel cooling and lubricating emulsion system and oil feeding system uncoiler, five machines, feeding hoe, electric motor, rolling shear, guide, Lubrication of steering rollers and coilers, gear oils, leveling machines, etc., oil film bearing systems for each frame. Bearings for high-speed, high-precision rolling mills, lubricated with oil mist and oil and gas. 

Let’s talk about it in detail below:

Hot-rolled sheet steel strip mill requirements for grease:

Strip technology is the technology with the highest technical content and the highest added value of products in rolling steel production. In order to improve the shape and surface quality of the rolled products, most of the strip mills use CVC, bending rolls, nip rolls, and other world-class technologies. However, due to the harsh bearing conditions of such rolling mills, the selection of suitable greases is carried out. Lubrication is especially important.

Plate type rolling steel work roll housing high temperature: the billet temperature is above 1200 °C. During the rolling process, the radiant heat and conduction heat can make the work roll housing temperature reach 100 °C or above.

Heavy load: the rolling mill bearing is subject to a large rolling force and impact load, especially due to the joint action of the CVC rolling mill, the nip roller and the bending roller, the rolling force of the rolling mill bearing can be decomposed into the axial force and the radial force. The axial force is mainly caused by the roll (the roll is plus or minus 100 mm), and the radial force is mainly composed of the rolling force and the bending force (the bending force is 120 tons/roll neck).

Multi-water: During the rolling process, a large amount of spray water is required to cool the rolls, and the spray water can easily enter the bearing, especially the lower work rolls.

High speed: The billet has a high rolling speed in the finishing zone, and the wire speed of the F6 frame can be 13m/s. Rolling mill bearings require excellent high-temperature resistance: the thickener of the rolling mill bearing grease has high physical stability, does not melt or decompose at the ambient temperature used; the tendency of the grease to soften at high temperatures is small; Has good thermal reversibility. The lipid drop point should be greater than 250 ° C to ensure that it can be used in high-temperature environments. It also has good pumping performance at lower temperatures and a wider temperature range.

Excellent water resistance: the consistency of the rolling mill bearing grease should not be much lower after it is in contact with water or even mixed with water. It prevents the loss of lubricant and reduces the lubricity, and it still has good protection.

Excellent rust and corrosion resistance: The bearing grease of the rolling mill should be able to maintain good protection and lubricity in the water vapor and dust environment and prolong the life of the bearing.

Good extreme pressure and wear resistance: the rolling mill bearing grease should be able to withstand a large rolling force and impact load, especially under the joint force of CVC rolling mill, nip roller and bending roller, it can form a good oil film thickness.

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

What Are The Advantages Of Non-Twist Rolling Mill?

What Are The Advantages Of Non-Twist Rolling Mill?

What are the advantages of the non-twist rolling mill in the application?

Rolling mill is mainly for various products, but if you want to achieve good production results, then the type of mill you choose must be fully matched with all aspects, so the ability of ordinary rolling mill must be relatively limited, but after the improvement of the new equipment is different, such as the non-twist rolling mill ! No matter in the quality of the tied piece or the rolling efficiency, there are obvious improvements.

Understand what is the non-twist rolling mill?

What is a non-twist rolling mill, in fact, in the rolling mill set, the use of all-flat layout, effectively achieve the whole line of the non-twist rolling process, to put it simply, this rolling mill in the whole process of rolling, without any twist.

It is precisely because of these minor improvements that the utilization ratio of the rolling mill has been greatly improved, and the overall productivity of rolling mill has been increased. At the same time, the different defects that may occur during the twisting of the tie piece have been improved. The most important thing is to improve the rolling quality.

 Please contact stella@hanrm.com for a quotation.

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

What is Walking Beam Cooling Bed?

What is Walking Beam Cooling Bed?

Walking Beam Cooling Bed Introduction: 

(1) The Usage of Walking Beam Cooling Bed: Arranged behind the rolling mill for cooling of finished steel and bar products. Cooling finished product specifications Φ10 ~ 40mm rebar, Φ10 ~ 50mm round steel. The steel grade is plain carbon steel, excellent carbon steel, and low alloy steel. The speed of the large finished product is 16m/s and the annual production capacity is 600,000 tons.

(2) The rolling mill cooling bed type is the walking beam type of the rack. The effective size of the bed is 96000×9500mm. The large length of the steel is 90m, the pitch of the tooth is 100mm, the thickness of the rack is 18mm, the spacing of the static rack is 300/600mm, and the distance between the racks is 300/. 600mm.

(3) Walking beam cooling bed input roller: roller diameter Φ188mm, roller length 190mm, roller distance 1200mm, inclination angle 12°, drive type single machine drive, variable frequency speed regulation, irreversible, roller line speed 4.5~20m/s(max), motor YVPG100L2-4 , 2.2KW, 1500rpm, each motor with axial flow fan 125FZY2-S, 25W, 220V, 50HZ, the number of 115; 6 free rolls.

(4) Walking beam cooling bed dial-in mechanism: the width of the dial-in block is 150mm, the length of the dial-in block is 138m, the angle between the dial-in block and the horizontal is 35°, the angle between the dial-in block and the vertical is 12°, and the speed of the dial-in block is 0.15~0.3m/s. The dial-in block is lifted and hydraulic cylinder Φ63/Φ45x90. Pneumatic gear cylinder QGAIIΦ80×20-MP4, 1; compressed air working pressure 0.4~0.6Mpa, cycle 4s~12s.

(5) Walking beam cooling bed surface drive: main motor Z4-280-21, 132kW, speed 750/1600rpm, 2 sets; photoelectric encoder LAKESHORE, 2; reducer A=508mm, I=41, 4 sets; eccentric wheel eccentricity 50mm. The rack moves once the steel stroke by 100mm.

(6) Alignment roller path: roller diameter Φ225/165mm, roller length 810mm, effective number of teeth 6, roller surface speed V=1.1m/s, roller spacing 1200mm; reducer BWD1.5-18-11, I=11 , motor Y90L-4, 1.5KW, 1400rpm, the number is 45; the number of free rollers is 18.

(7) Chain type steel transfer machine: Transfer steel specifications ф12 ~ ф50mm. The length of the steel is 90m, the width of the chain transfer machine is 1500mm, the chain spacing is 1200mm, the chain speed is 0.2m/s, the stepping distance is 20~70mm, the transmission motor is YTSP160M-4, 11KW, 1500rpm, AC380V, 2 sets. The center distance of the reducer is 349mm, the transmission ratio is I=1:75, and the number is 2.

(8) Transport trolley: the width of the trolley is 1000mm, the lifting time of the trolley is 1~2s, the round-trip speed of the trolley is ~0.5m/s, the transmission motor: YTSP132S-4, 5.5KW, 1500rpm, AC380V, 2 sets, reducer: A=349mm, I = 1:45, 2 sets. The trolley is lifted and used with a hydraulic cylinder.

(9) Output roller path: roll diameter: Φ188 mm, roll length: 1000 mm, roll distance: 1200 mm, roll line speed: 2 m/s, number of rolls 86, 6 free rolls. Roller motor: YGb112L2-4, 1.5KW, 1450rpm, AC380V, 80 units, reversible.

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

What Should The Rolling Mill Need To Pay Attention To During The Shutdown?

What Should The Rolling Mill Need To Pay Attention To During The Shutdown?

In the production process of the rolling mill, what should be noticed after the rolling mill is shut down when there is a downtime overhaul or an unexpected situation?

1. After the rolling mill stops, stop the feeding of steel, and take the gas cutting and cutting out of the online rolling parts to avoid the stress on the rolls and cause damage.

2. If the rolling mill needs long-term shutdown, the best method is to open the lubrication system to keep the main bearing lubricated, and then close it in to avoid dust and debris entering the bearing.

3. Cut off the power supply of the rolling mill and auxiliary equipment.

4. Drain the water in the cooling tube to avoid freezing the cooling water pipe when it is cold.

5. Protect the lubrication system, motor, air clutch and slow drive from dust, but not tightly sealed to avoid moisture accumulation. Use a small heater or protect the bulb to prevent moisture buildup.

6. Place bagged desiccant in all control and electrical panels to prevent moisture build-up and safely seal the control panel.

The above need to pay attention to is that the rolling mill production enterprises need to pay special attention to it. Only when the rolling mill is under maintenance, the rolling equipment can better complete the production task during the production period, improve the rolling efficiency and extend the usage time of rolling mill.

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

What is a Rolling Mill?

The steel rolling mill is the equipment to realize the metal rolling process. Generally refers to the equipment used to complete the whole process of rolling production, including main equipment, auxiliary equipment, lifting and transportation equipment and ancillary equipment. But generally speaking, the rolling mill only refers to the main equipment.

II. Nomenclature of Rolling Mill

It is named after the type of rolled product, the type of mill and the nominal size. The principle of "nominal dimension" refers to the section mill as the pitch diameter of the herringbone gear of the gear base; the blooming mill as the nominal diameter of the roll; the strip mill as the length of the working roll body; and the steel tube mill as the maximum diameter for production. It is sometimes named after the inventor of a rolling mill (e.g. Sendzimir mill).

III. Selection of Rolling Mills

The type and dimension of finished or semi-finished rolling mill shall be selected according to the requirements of product variety, specification, quality and output, equipped with necessary auxiliary, lifting, transportation and accessory equipment, and finally balanced according to the requirements of various factors.

IV. COMPONENTS OF STEEL ROLLING MILLS

1. Work stand: composed of roll, roll bearing, frame, rail seat, roll adjustment device, upper roll balance device and roll changing device, etc.

2. Roll: It is a part that makes metal plastic deform.

3. Roll bearing: support the roll and maintain the fixed position of the roll in the frame. Roll bearings vary greatly with heavy working loads, so small coefficient of friction, sufficient strength and stiffness are required, and rolls can be easily replaced. Different types of roll bearings are used for different mills. Rolling bearings are mainly used for work rolls of strip mills because of their high rigidity and small coefficient of friction, but their small pressure-bearing capacity and large size. Sliding bearings have two types: semi-dry friction and liquid friction. Semi-dry friction roller bearings are mainly bakelite, copper and nylon bearings, which are relatively inexpensive and are mostly used in profile mills and billet openers. There are three kinds of hydrodynamic, hydrostatic and hydrostatic bearings. The advantages are small friction coefficient, large pressure-bearing capacity, high working speed and good rigidity, while the disadvantage is that the oil film thickness changes with speed. Liquid friction bearings are mostly used for support rolls in strip mills and other high-speed mills.

4. Mill stand: It is composed of two "archways" to install the roll bearing block and roll adjusting device. It needs sufficient strength and steel strength to withstand the rolling force. There are two main types of rack, closed type and open type. Closed stand is an integral frame with high strength and rigidity, mainly used for blooming mills and strip mills with high rolling force. Open frame is composed of frame body and upper cover, which is easy to change rolls. It is mainly used in cross section mills. In addition, there are no archway mills.

5. The rolling mill track base is used to install the frame and fix it on the foundation, also called the floor plate. To withstand the gravity and tipping moment of the worker base while ensuring the accuracy of the mounting dimensions of the worker base.

6. Roll adjustment device: used to adjust the roll gap so that the rolled piece can reach the required section size. Upper roll adjustment device, also known as "press-down device", has three kinds: manual, electric and hydraulic. Manual press-down devices are commonly used in profile mills and small mills. Electric press-down device includes electric motor, reducer, brake, press-down screw, press-down nut, press-down position indicator, spherical pad and pressure gauge and other components; it has low transmission efficiency, large rotating inertia of moving parts, slow reaction speed and low adjustment accuracy. Since 1970s, AGC (Automatic Thickness Control) system has been used in strip rolling mills. Hydraulic press device has been used in new strip cold, hot and thick rolling mills, which has the advantages of small thickness deviation and high product qualification.

7. Upper roll balancing device: device used for lifting upper roll and preventing impact of rolled parts when entering and leaving the roll. Forms are: spring type, multi-purpose on profile rolling mill; hammer type, commonly used on blooming mill with large roll movement; hydraulic type, multi-purpose on four-roll strip rolling mill.

In order to improve the operation rate, it is required that the roll change of the rolling mill be quick and convenient. Roll change modes are C-hook type, sleeve type, trolley type and frame type. Roll change in the first two ways is assisted by crane, while the whole frame requires two sets of frame for roll change. This method is mostly used for small mills. Car roll change is suitable for large rolling mills and facilitates automation. At present, the rapid automatic roll changing device is used on the rolling mill. It only takes 5-8 minutes to change the roll once.

8. Driving device: It consists of electric motor, reducer, gear seat and connecting shaft. The gear base distributes the drive torque to two or more rolls.

9. Auxiliary equipment includes a series of equipment for auxiliary process in rolling process. Such as raw material preparation, heating, steel turning, shearing, straightening, cooling, flaw detection, heat treatment, pickling and other equipment.

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

Repair Technology for Bearing Position Wear of Cold Shearing Machine

Repair Technology for Bearing Position Wear of Cold Shearing Machine

Introduction of Cold Shearing Machine

Cold shearing machine is the main equipment for finishing section in bar production line. Its function is to cut the finished rolled piece to a fixed scale. Its structure (see Figure 1) consists of: cutting edge, crankshaft, pulley, electric motor, brake and clutch. The flywheel is mounted on the main shaft, and the motor drives the flywheel to run through the belt. During the shearing action, the clutch connects the main shaft to the flywheel, so that the reducer drives the eccentric wheel to run, and the shearing frame equipped with cutting edges completes the shearing action downwards.

Reasons for Wear of Cold Shear Shaft

In a bar workshop of an iron and steel enterprise, the cold shearing machine suffers from wear problems. The wear location is the mating surface between pulley and spindle. The diameter of the spindle is 180mm and the wear width is 110mm. The damage location is local deep wear, the maximum wear is about 5mm, and the bearing type is SKF2236EC.

Generally, there are many reasons for wear of shaft type. All kinds of defects during manufacture and bad problems in different stages of assembly, maintenance and use during use may cause wear of bearing position. Apart from these problems, the principal reason is that the metal properties used to fabricate shafts are determined by their high hardness, but poor concessionality (which cannot be restored after deformation), poor impact resistance and poor fatigue resistance, which easily lead to adhesive wear, abrasive wear, fatigue wear, fretting wear, etc. Most of the shaft wear problems are not easy to detect. Only when high temperature, large runout, abnormal noise and other conditions occur, most of the shafts have been worn seriously, resulting in machine shutdown.

Repair Process of Cold Shear Shaft

The traditional method to deal with this kind of bearing position wear problem is to transport the shaft to the machine repair plant after disassembly for repair welding and bushing insertion, etc. However, the process of repair welding machine itself is easy to cause local thermal stress on the shaft surface and cause hidden danger of shaft breakage. Moreover, the process of repair welding machine needs a lot of manpower and time to dismantle, transport and install the equipment. The repair time is long and the comprehensive repair cost is high. The cold shearing machine is shut down by accident and must restore the operation of equipment quickly and effectively. Therefore, traditional repair technology is obviously not suitable for this repair of bearing position wear.

Polymer composites can select different repair processes according to the parameters such as rotational speed of equipment, bearing type and service requirements. After observing the field conditions, it is found that a large area of datum surface still exists. Only partial damaged parts can be filled and repaired by materials. Components of the Fossil Blue process can be used to repair the relationship (see Figure 2), which has the characteristics of short repair time, high repair accuracy, low repair cost, no secondary damage to the equipment and easy operation.

Implementation Process of Site Plan

1. Surface treatment: First, bake the worn position to remove the grease which penetrates into the metal micropore;

2. Grinding: Use sandpaper to grind the worn area and clean it with alcohol or acetone.

3. Harmonizing Material: Harmonizing Fossil Blue Proportionally ® 2211F material and stir evenly until there is no color difference.

4. Coating material: Use 2211F material to fill out the wear position and slightly exceed the wear amount.

5. The inner race of the bearing is assembled directly after being dried with mould release agent, and the bearing can be started up after material curing is completed.

Through years of application experience in industrial field, after unexpected sudden shutdown caused by wear of driving parts in enterprises, the technology can make corresponding repair plans according to the operating conditions and design parameters of different equipment and the forming characteristics of polymer composites. It can solve the problem of wear on the transmission part of equipment in the first time, and meet the operation conditions of most equipment to the maximum extent by using the limited basic conditions in the field, thus greatly improving the repair efficiency and accuracy.

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

Metallurgical Slitting Rolling Technology

Metallurgical Slitting Rolling Technology

Whether the rolled piece can be cut is not only related to the thickness of the connecting part and the relative reduction but also closely related to the pass shape and the size of the slit rolling. In the pass design of the slitting process, the design of pre-cutting and slitting holes is particularly important, followed by the vertical box pass. The pass design of these passes is related to the success of slitting and rolling.

The pre-cut split hole is a transitional pass to ensure the smooth slitting of the split hole. Its purpose is to reduce the unevenness of the split pass, so that the splitting wedge can complete the pressing and positioning of the opposite rolling piece, and accurately distribute the rolling. The cross-sectional area of ​​the piece reduces the burden of cutting the hole as much as possible, thereby improving the stability and uniformity of the cutting. The design should have sufficient reduction, the elongation coefficient should be 1.3 to 1.4, the expansion coefficient should be about 0.6, and the height of the connecting belt should be 0.45-0.48 times the height of the hole.

The slitting hole is basically formed by the connection of a double round pass and a slitting wedge. The function of the slitting pass is that the slitting wedge continues to press down the middle of the pre-slit rolling piece, rolling out the same shape as the pass Rolled pieces, so that the thickness of the connecting strip meets the needs of tearing apart multiple rolling pieces in parallel. In the process of slitting and rolling, due to the effect of the slitting wedge, the limitation of the non-porous side wall on both sides of the rolling piece in the slitting pass, and the rolling piece has a more complex cross-sectional shape, the changes of the rolling piece are as follows: Different from conventional rolling. Its main features are as follows. Severe uneven deformation. The compression deformation at the cutting wedge is often greater than that of other parts.

Splitting deformation is no extension or small extension deformation. When slitting the rolled piece in the slitting hole, the reduction at the bottom of the groove is small, while the reduction at the slitting wedge is larger, and the metal is subjected to the action of the slitting wedge, and the horizontal component force pointing to the widthwise direction is larger. It is a forced widening deformation, so the overall extension is small and the widening is larger.

When multiple roots are divided, the cross-sections of the rolling pieces in the middle and the sides are different, and the width of the rolling pieces on both sides is large and the extension is small; the head and middle dimensions of the rolling piece are also different, and the width of the head and tail is widened. The wedge angle of the slitting hole should be reasonable. If it is too small, it will not cut cleanly or cut. If it is too small, it will cause too much clamping force on the slitting wheel and increase the load of the slitting wheel, generally 60°-65°; The rounded corner of the tip is preferably 1～1.5mm. Too sharp will accelerate the wear of the roll; the thickness of the connecting belt should be close to the gap of the roll, 1-2mm is best; the elongation coefficient is 1.08～1.15, and a certain amount is reserved. Broad room for expansion.

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

More News You May Interesting:

Finishing Rolling Mill Process Explanation

Reasons and Solutions for the Piling of Wire Rod Rolling

Characteristics and Quality of Wire Rod

Morgan Wire Rod Mill

Why does the Steel Bar Bend after being Cut by Flying Shear?

Headless Welding Rolling Process

Bar Rolling Mills Water Cooling Technology

How to Improve the Thermal Efficiency of the Reheating Furnaces？

Causes of Surface Cracks in High-Speed Wire Rod Rolling Mill

What is Slit Rolling?

Failure Analysis of Cold Mill Roll

Causes and Solution of Steel Piling-up in High-speed Wire Rod Rolling Mills?

Bar Automatic Counting System

Rolling Mill Pass Design

What are the Failures of the Rolling Mill in Slitting Rolling?

What are the Failures of the Rolling Mill in Slitting Rolling?

In the slitting rolling of the rolling mill process, various bad phenomena often occur because of the misoperation, which directly affects the quality of the whole piece. Therefore, the corresponding preventive measures should be taken before rolling to ensure that the quality of the tied parts produced is the best.

During the whole rolling process, when the fastener leaks out in the high-temperature zone, it is very prone to burr. If it is in contact with the fastener or the temperature rises too fast, there will be the defect of sticking steel. At this time, if the tie piece and its contact, then there will certainly be a very serious situation of sticking steel. Now that the problem of failure has been listed, how should we prevent and solve it?

1. Strengthen the cooling of the discharging tool of the rolling mill so as to avoid sticking steel to the fastener due to high temperature.

2. Reduce the burr of the slitting box in slitting rolling and prevent the leakage of tied parts in the high-temperature area.

3. Periodically check the roll gap of the roll and the value of the roll gap of the slitting wheel, so as to effectively avoid the occurrence of sticking steel.

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

More News You May Interesting:

Finishing Rolling Mill Process Explanation

Reasons and Solutions for the Piling of Wire Rod Rolling

Characteristics and Quality of Wire Rod

Morgan Wire Rod Mill

Why does the Steel Bar Bend after being Cut by Flying Shear?

Headless Welding Rolling Process

Bar Rolling Mills Water Cooling Technology

How to Improve the Thermal Efficiency of the Reheating Furnaces？

Causes of Surface Cracks in High-Speed Wire Rod Rolling Mill

What is Slit Rolling?

Failure Analysis of Cold Mill Roll

Causes and Solution of Steel Piling-up in High-speed Wire Rod Rolling Mills?

Bar Automatic Counting System

Rolling Mill Pass Design