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.

What's The Difference Between Hot Rolling And Cold Rolling?

What's The Difference Between Hot Rolling And Cold Rolling？

Hot rolling has the following characteristic, low intensity, good extension, the surface is not shinning.

Cold rolling has the following characteristic, high intensity, high hardness, shining surface.

Hot rolling mill: though high heating, then rolling it to the certain structure.

Cold rolling mill: not heating, in common temperature, normally below critical point.

The mechanical property through hot rolling and cold rolling is different.

Cold rolling is in low hardness, easy to process, with good intention, easy to form cold stress, hot rolling is for high hardness, high intention, difficult to process, not easy to deformation. 

Hot rolling needs to be heated, normally temperature should above the critical point, the processing is under high temperature, make the steel recrystallization happen, but not changing the steel structure.

Cold rolling is under normal temperature, roll it into aiming thickness, compare with hot rolling , cold rolling has high accuracy, smooth surface, better mechanic characteristic, especially processability, because the raw material of cold rolling is very crisp and hard, not suitable for processing, normally, cold rolling steel plate should be acid pickling and surfacing, then can send them to final customer.

The difference between cold rolling and hot rolling is not in the process, but the temperature, hot rolling is easy to roll, and high efficiency, but hot rolling makes steel oxidation, surface gray and not shining; cold rolling requires high power motor, low efficiency, high cost, but with very shining surface, can be used as the final product directly, widely used.

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.

Wire and Bar Rolling Mill & Reducing and Sizing Mill

Wire and Bar Rolling Mill & Reducing and Sizing Mill

For a long time, the output of bar and wire rod in China has been between 40% and 50% of the total output of iron and steel products. In recent years, the total output of bar and wire rod has exceeded 400 million tons. Except for about 10% of exports, the rest of the output is used for domestic digestion. It can be seen that bar and wire rod products play a very important role in national economic construction. There are more than 1000 production lines in China. 

Since the 1980s and 1990s, China has introduced foreign advanced bar and wire rolling mill one after another. By digesting, transforming and upgrading this technical line, China's domestic bar and wire rolling mill equipment have approached the world's advanced level. With 12% of the imported international advanced level production lines, at present, it is above the domestic advanced level. Some of them accounted for about 75% and became the mainstream of the market. Another 20% of the ordinary rolling mills adopt the twist rolling process with large output, which is only suitable for the production of ordinary carbon steel. There are still 5% backward mills to be eliminated.

After more than 30 years of development, the types of bar mills can be classified into three categories: closed two-high mill, short stress path mill and cantilever roll ring mill. Among them, the closed two-high mill is mainly Morgan type and Simac type (including Demark type). Through introduction and digestion, Morgan type closed mill has been successfully applied to hundreds of domestic production lines. The main imported models of short stress path rolling mill are Danieli type and Premini type. Our major research institutes have developed their own brand of short stress path rolling mill, which has been applied in hundreds of bar and wire production lines in China. Cantilever roll ring mill is only developed by Danieli, but it is seldom imported in China, such as Laigang and Tangshan Iron and Steel Company, which is only used in roughing mill.

Bar reducing and sizing mill is a kind of mill installed in bar finishing mill to improve product size accuracy and product performance (rolling by controlling temperature). It is mainly used for a bar of special steel. Reduced sizing mill is different from common mill in three aspects: first, using clutch with speed ratio to meet the needs of different rolling speeds of all products; second, using minimum mill center distance to reduce the size impact of micro-tension rolling; third, using single pass carbide roll ring, roll as double support. Support to ensure sufficient stiffness to meet a wide range of product specifications. At present, there are two types of imported machines in China: two-high mill and three-high Y mill. The two-roll mill is mainly of the predominant type and the Danieli type. There are three-stand flat-vertical arrangement and a four-stand flat-vertical arrangement. The roll system of the mill adopts the frame structure of the short stress line mill with high stiffness. Three-roll Y mill is mainly KOCKS type and Simac type. It usually consists of 3-5 stands. Roll passes are arranged alternately by Y-Δ. 

Hot Strip Rolling Mill Plant | Hot Strip Mill in Steel Plant | Strip Rol...

There are four types of hot strip rolling mill according to product width and production process: hot strip rolling with a wide strip, reversible hot strip rolling with a wide strip, hot strip rolling with a narrow strip, and hot strip rolling with a planetary rolling mill. The materials used for strip steel are plain carbon steel, low alloy steel, stainless steel, and silicon steel. It is mainly used for raw materials of cold-rolled strips, welded pipes, cold-bent, and welded sections, or for making various components.

What is a Wire Rod Mill Laying Head?

What is a Wire Rod Mill Laying Head?

The laying head of wire rod mill is the key equipment in high-speed wire production to spin rolled wires into coils for collection.

Wire rod mill laying head is one of the key equipment in high-speed wire production and an important bottleneck restricting further speed-up of high-speed rolling mill. The quality of wire spinning directly affects the physical quality of high-speed wire. With its special shape structure and certain speed, the laying head changes the straight current wire moving at high speed into coils with stable ring shape and uniform spacing. With the increase of wire rolling speed and output, the requirement for wire rod mill laying head is getting higher and higher. Therefore, many high-speed wire production enterprises will have unstable coils in production, which will affect product quality and smooth production.

With the development of wire production technology, horizontal wire rod mill laying head has become the throat part of the production line as a coiling equipment matching with the uncoiled cooling line. Its function is to guide the wire rolled from the finishing mill K1 or pinched in a straight line into a horizontal laying head machine. The wire slips relatively without twist in the tapping tube with rotation. Under the action of centrifugal force, Coriolis force, inertia force and friction force, it bends and deforms gradually along with the shape of the tapping tube, reaches the required curvature at the outlet, forms the spiral coil and realizes its working purpose.

The high-speed wire rod mill laying head is a horizontal structure, which is located between the water-cooled box and the cold-controlled roll track of the controlled cooling line after the finishing mill. Horizontal laying head machine is composed of transmission device, shield, tapping disc, hollow shaft, tapping tube, bearing seat, motor, bevel gear pulley and other components. The threading machine is driven by a motor and driven by a pair of bevel gears meshing in the gear box to rotate the hollow shaft. The threading tube is installed on the threading disc, which is connected with the hollow shaft by bolts. 

Walking Beam Cooling Bed

The walking beam cooling bed and continuous casting billet turnover cold bed series products are mainly applicable to bar, profile and billet production lines in iron and steel smelting industry. The step-by-step cold bed can meet the annual production capacity of 100-1 million tons.

The walking beam cooling bed consists of four parts, i.e. feeding system, body of the cold bed, leveling device and feeding device. The feeding system uses cylindrical roller bed to be tilted and positioned. Frequency converter roller bed motor drives independently. The feeding on roller bed is braked by a single skirt. The feeding mechanism includes curved plate type, pinch roll belt trough type and brake apron type. Brake apron lifting includes hydraulic, mechanical and other structural forms. The cold bed is step-by-step. Input roller is controlled by frequency conversion or driven directly by AC, while output roller is driven by AC.

Walking beam cooling bed is the working table for effective cooling of rolled products (threaded steel, round steel, steel pipe, etc.) in metallurgical rolling steel industry.

Classification:

 The walking beam cooling bed mainly include pull-tooth type, rack step type, pawl type, chain type and roller type.

Composition: 

The walking beam cooling bed consists of mechanical transmission system, water cooling system, working table of the cold bed, fixing support, etc.

Working principle: 

The rolled products are conveyed into the cold bed through the roller track, and then the work pieces arranged on the cold bed are moved to the top of the cold bed step by step by step by rack pulling the teeth. The cooling effect of the work pieces is achieved.

Main application: 

The walking beam cooling bed equipment is mainly used for slow natural cooling of rolled steel plate on-line. On the profile production line, the cold bed also has the function of pre-bending the profile to prevent irregular bending of the profile due to unequal quality everywhere during the natural cooling process.

Application field: 

Walking beam cooling bed is mainly used in iron and steel industry, metallurgical industry, etc.

Environment and Conditions for Equipment Use: 

Ambient Temperature: -20-+40 C

Working environment: not suitable for flammable and explosive

Altitude: +108 M