Technical Progress Of High Speed Wire Rod Rolling Mill

Technical Progress Of High Speed Wire Rod Rolling Mill

Technical progress of high-speed wire rod rolling mill as followings: 

1) Continuous, torsionless and high-speed rolling. Roughing rolling and intermediate rolling are arranged alternately, and pre-finishing rolling is installed in front of the finishing mill. The maximum final rolling speed is designed to reach 120 m/s. 

According to the latest production practice, the maximum rolling speed will be guaranteed according to different specifications of wire rods. For example, in 2010, Siemens Austria Steel United Corporation (Morgan Company was annexed by the company) designed and manufactured high-speed for Xuanhua Iron and Steel Company. The guaranteed final rolling speed of the wire rod rolling mill is small wire rod Φ5.5-7.5 mm | 112 m/s, Φ5mm | 105 m/s for medium and 85 m/s for small diameter 6 mm quenched threaded steel. 

Improving the finishing rolling speed of the wire rod mill is a systematic project. It involves not only the main rolling mill machinery and electrical equipment but also the number of finishing mills, the rack spacing, and the cooling system. It does not affect the mechanical properties of products because of the high finishing rolling speed and the high finishing rolling temperature. 

It also requires supporting equipment such as a spinning machine and flying shear to withstand the high-speed impact of wire rods. 

2) Adding reducing and sizing equipment to improve product accuracy and solve the temperature control problem in the wire rod finishing rolling process.

3) Increasing the cross-section of the feed billet can not only meet the need for an upstream continuous caster to improve the productivity and quality of the billet but also increase the coil weight and increase the productivity and yield of the wire rod rolling mill.

4) The qualified billet is heated and soaked directly into the heating furnace through the hot charging roller. The hot charging temperature can reach over 600 C, which improves the productivity of the heating furnace, reduces the energy consumption during billet heating and the loss of oxide scale during billet cooling and heating, and improves the metal yield.

5) Low-temperature rolling. The starting rolling temperature is controlled at 950 C. The stiffness of the mill stand and the capacity of the main motor can meet this requirement in order to achieve overall energy savings and reduce metal burning.

6) Controlled cooling and temperature rolling.

7) Single-pass system. All products (small 5.0-25mm) only need to change rollers on four reducing and sizing mills, and no rollers need to be changed for other mills, thus significantly improving the productivity and productivity.

8) The latest generation of spinning machines and winding stations. In the form of asymptotic bending, the ideal trajectory of wire moving in the spinning tube is given, so that the wear of the spinning tube can be reduced and the running stability can be achieved.

The 90m High-Speed Wire Rod Rolling Line Project In Ethiopia Start Production

The 90m High-Speed Wire Rod Rolling Line Project In Ethiopia Start Production

December,13th,2016, the 90m high-speed wire rod rolling line project in Ethiopia contracted and constructed by Hani Tech has been put into production at 10 am local time. This means the whole rolling project and all the steel rolling mills it contains customized for SHENZHEN STELL with an annual capacity of 300,000 tons have been officially accomplished and transferred.

This whole project of a wire rod rolling production line with an annual capacity of 300,000 tons only takes WEIKEDUO less than a year to construct, which seems really miraculous for it could cost 3 years of construction for a complex project like this. As an experienced professional manufacturer of metallurgical types of machinery like monoblock mills, hot rolling mills, flying shears, and other associated equipment, WEIKEDUO has dedicated itself to developing and providing advanced and durable machinery equipment for all our clients around the world.

This brand new rolling line in Ethiopia will provide more job opportunities for local people and government while it would also boost the local economy vigorously. The present Director of Investment from the Ethiopian government, Fitsum, has once again declared the fact that the Ethiopian government will encourage and support all Chinese companies with competitive advantages and good faith to invest and develop in Ethiopia as always. And they will provide a solid foundation for all these companies to grow.

The deputy director of the Eastern Industry Zone, Jiao Yongshun, has also congratulated the success of the project and indicated that this rolling project could be another achievement to our current One Belt and One Road Initiative.

High-Speed Wire Rod Mill Production Line Process Flow

High-speed Wire Rod Mill Production Line Process Flow

Billet preparation: 150 mm *150 mm *14 000 mm continuous casting billet.

Reheating furnace: The billet is heated to austenite temperature to facilitate rolling. 

High-pressure water descaling: After the billet is heated in the reheating furnace, before entering the roughing rolling mill, it is necessary to descaling with high-pressure water to remove the oxide scale and secondary oxide scale on the billet surface, so as to avoid defects on the pressed surface. 

Roughing mill, medium rolling mill, and finishing rolling mill rolling: the size of finished products, including 6 roughing rolling mills, 6 medium rolling mills, 4 pre-finishing mills, 10 finishing mills, a total of 26 rolling mills on this high-speed wire rod mill production line.

Flying shear head and tail: Before entering each set of rolling mills, the work of cutting head and tail must be carried out in order to remove the head with too low temperature to avoid damage to the roll surface and prevent the head of the rolling piece from being stuck in the inter-stand guide device. The stuck shear is used to crush and break the rolling event before the medium rolling mill, the pre-finishing mill and the finishing mill in the accident state.

Water cooling: In order to reduce the rolling temperature entering the finishing mill, a water tank is set before the finishing mill to control the finishing temperature. 

Rolling: Rolled wires are rolled into rolls after cooling through water, forming loose rolls through spinning.

Stelmore uncoiled cooling: The cooling speed of the controlled cooling line is controlled according to different steel grades and product uses, so as to obtain the corresponding product quality. 

Finishing and transportation: including coiling, dressing, inspection, sampling, baling and rolling, weighing and hanging tags, using the coiling device to collect loose rolls, and hanging them on the C-hook on the P-S transport line, completing the process of coiling, dressing, inspection, sampling, baling and rolling, weighing and hanging tags in turn, and then unloading and entering the warehouse.

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

Why High-Speed Wire Rod Mill Adopts Collective Transmission Mode?

Why High-Speed Wire Rod Mill Adopts Collective Transmission Mode?

In high-speed wire rod mill, the finishing mill adopts collective transmission mode, which is due to:

1) In order to shorten the excess length of the head and tail of the rolling piece caused by drawing, the structure of the rolling mill is required to be as compact as possible, so that the space between the stands is very small. Under this compact condition, it is impossible to arrange the rolling mill as a single transmission. 

2) The finishing mill of high-speed wire rod mill not only has high speed but also needs to be adjusted to different speeds according to different product specifications. If it is driven separately, the number of frames is large, and the speed required by different product specifications varies greatly in different sorties. Therefore, the required electrical control system will be very complex, and at the same time, it must have high sensitivity to adapt. 

Therefore, even if the electrical system can do it, it is difficult to maintain the micro-tension rolling relationship between the racks for all product specifications. 

3) The combined structure of collective transmission greatly improves the dynamic speed drop of the motor at the moment of biting and makes the micro-tension relationship between the stands unaffected by the electrical equipment, thus creating favorable conditions for the micro-tension rolling at high speed. 

In summary, the design of roughing mill, medium rolling mill and pre-finishing mills using AC motor drive alone, finishing mills using AC motor collective drive.

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

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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Wire Rod Mill | De-Bars Rolling Mill for Sale

Wire Rod/ De-Bars Rolling Mill for Sale

Continuous Rolling Mill


Wire Rod/De-bars Rolling Mill Capacity: 650.000 -800.000 TPY

Weight of equipment is about 3000 tons

Wire rod size: 5.5-23mm

Rebar in coil size : 6-8-10-12mm

Number of booths: 29

Number of shears: 5

Pinch rolls: 4

Water boxes: 8

Laying heads: 2

Column: 2x75m

Coil exit Morgan

2 Binder machines Healthy birch

Max. speed: 90m/sec

The Wire Rod Mill | De-Bars Rolling Mill is dismantled and packed in boxes ready for immediate shipment.


Free send inquiry to stella@hanrm.com if any needs.
Whatsapp/Wechat:+8615877652925
Website:  https://www.hanrm.com

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Development of Wire Rod Mill

    At present, Asia is the fastest-growing economy in the world. However, China is the focus of Asia. Under such a rapid development situation, China's infrastructure has developed rapidly, and various types of wires have been in short supply. The original old-fashioned horizontal rolling mill and double-rolling mill are far from meeting the needs of today's market development in terms of accuracy and quality, as well as in terms of output and control level.

    Therefore, in the late 1960s, with the continuous improvement of the technical level, various new types of high-speed twistless finishing mills were developed in the world, and the wire weight was increased from tens of kilograms to two and a half tons. The final exit speed of the rolling is increased from the original 20m/s to 30m/s to the current 130m/s, and the finished product tolerance is ±011mm.

Due to the smooth surface quality of the wire, the head-to-tail tolerance value is small, and the metallographic structure is more uniform after the water-cooling and the loose-rolling control are cooled, so that the wire can be drawn without heat treatment, thereby greatly reducing the cost and receiving a large number of users. Praise and welcome.

At present, representative finishing mills include internal drive 45-degree wire rod mill, external mesh drive 45-degree finishing mill, X type 45 degree centralized drive finishing mill, Y type three-roll finishing mill, flat roll drive finishing mill, 75 degrees. ×15 degree concentrated transmission finishing mill six types.

Compared with the old-fashioned rolling mill, these rolling mills have the following characteristics:
1. Single-line continuous rolling, convenient and safe operation;
2. High rolling speed, currently up to 130m/s;
3. Convenient for changing rolls;
4. Convenient for changing guides;
5. High, low cost;
6. Wire rod tolerance is small, the surface is smooth;
7. Wire rod has high internal quality;
8. High level of automation control.

In recent years, China's wire rod mill equipment has developed very rapidly.

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HOT ROLLING MILL PROJECT

HOT ROLLING MILL PROJECT

2. Production wire rod mill line Summarize

  1) Annual Capacity: Around 30,000tons wire rod mill

  2) Raw material: 100*100*3000mm billet 

  3) Finished products: wire rod ¢5.5--¢12

  4) Steel-types of rolling：Low carbon alloy steel, stainless steel, plain  carbon steel

2. Power consumption of total loads for the equipment

     Around 2650kw Approximately

3. Total price for the Turn Key ( Including Furnace, motor, etc. )

      

4. Design process: 

   The Billets feeding into the reheating furnace, and come to the rolling mill, through 3hi rolling mill to 2hi rolling mill, after 22 passes, and become finished products wire rod.

5. All equipment list from Manufacturing Area：

1).  Φ350 Rough rolling mill, 3-hi

Scope of supply

Item	Quantity	Note
Φ1800mm flying wheel	1 set	cast steel
Reducer 1pcs	1pcs	cast steel (herringbone tooth)
Three axle box A=350mm	1pcs	cast steel
Cardan joint	3pcs	cast steel
Rack  A=350mm	1set	cast steel
Mill roll	3pcs	70MO2Mn
Bearing pedestal	6set	cast steel
630KW-8 Motor	1pcs	630kw

2). Φ280 Rough rolling mill, 3-hi

Item	Quantity	Note
Motor	1set	540KW
Reducer 1pcs	1set	cast steel (herringbone tooth)
Three axle box A=350mm	1pcs	cast steel
Cardan joint	3pcs	cast steel
Rack  A=280mm（3-hi）	2set	cast steel
Rack  A=280mm（2-hi）	1set	cast steel
Mill roll	8pcs	70MO2Mn
Bearing pedestal	16sets	cast steel

Item	Quantity	Note
Motor	1pcs	280KW
Reducer	1pcs	ZD60
Composite reducer	1pcs
Herringbone tooth 2-axle box	2pcs	A=250
Rack	6pcs	A=250
Cardan joint	12pcs	SWP235type
Mill roll	12pcs	Nodular cast iron
Bearing pedestal	24set

3).  Φ250 one-drive-two rolling mill, 1 set    (K6--K5)              

    

4).  Φ250 one-drive-two rolling mill, 1 set    (K4--K3)  

Item	Quantity	Note
Motor	1pcs	280KW
Reducer	1pcs	ZD60
Composite reducer	1pcs
Herringbone tooth 2-axle box	2pcs	A=250
Rack	6pcs	A=250
Cardan joint	12pcs	SWP235type
Mill roll	12pcs	Nodular cast iron
Bearing pedestal	24set

5).  Φ250 one-drive-two rolling mill, 1 set   (K2--K1)                  

Scope of supply

Item	Quantity	Note
Motor	1pcs	320KW
Reducer	1pcs	ZD60
Composite reducer	1pcs
Herringbone tooth 2-axle box	2pcs	A=250
Rack	6pcs	A=250
Cardan joint	12pcs	SWP235type
Mill roll	12pcs	Nodular cast iron
Bearing pedestal	24set

6. Other equipment：

Item	Quantity	Note
Reheating furnace	1set	22m*3.5m
Pushing device	1pcs	form a complete set
Discharge machine	1pcs
Runout roller table	1set
Scattered cold roller	1set	40m
Head cutting shear	1pcs	Form  A  complete set
Tail cutting shear	1pcs
Pinch roll	2pcs
Winding machine	1set
Before the roller billet	1set
Lift roller	3set
Transportation Roller	3set
The connection roller	1set

7. Wire Rod Mill Layout: