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.

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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.

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What Is Cold Rolling Mill ?

What Is Cold Rolling Mill ?

What is cold rolling? I believe people who will be very interesting in "What is Cold Rolling"?  

If the temperature is below its recrystallization temperature when mental rolled, the process is called cold rolling. 

Cold rolling is fulfilled by making steel strip through plenty of tandem rolling mill stands. And each one of stands has vertically stacked rolls that are powered by a huge motor to impart high compressing stresses into the strip. 

Cold-rolling mills can produce various products like the smooth tin plates flowing like water, shiny galvanized plates glittering like mirror and other colorful coated sheets. They can then be pressed into cans or applied on industrial machines and household appliances or even just for decoration. 

What rolling mills do are not just limited to those plates. Rods, bars, wires, rails... You name it. All these productions can be easily achieved just like the plates with rollers in different shapes. 

With the emergence of new technologies in this field, it’s not hard for us to believe that the rolling mills in the future will be smarter and much more powerful. The application of those new technologies will lead us to cost reduction, quality insurance and the improvement of competitive abilities. 

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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.

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What is Hot Rolling?

What is Hot Rolling?

Rolling mill is a metalworking process which divided into two types: hot rolling and cold rolling. Here we will analyze the hot rolling cause we had discussed cold rolling before.

In many theory books, which called hot rolling is a metalworking process that occurs above the recrystallization temperature of the material. On the contrary, it means that below the recrystallization temperature of the metalworking process is called cold rolling.

But what is hot rolling besides of this word. Here we have the detail explanation about it. After the grains deform during processing, they recrystallize, which maintains an equiaxed microstructure and prevents the metal from work hardening. The starting material is usually large pieces of metal, like semi-finished casting products, such as slabs, blooms, and billets. If these products came from a continuous casting operation the products are usually fed directly into the rolling mills at the proper temperature. In smaller operations, the material starts at room temperature and must be heated. This is done in a gas- or oil-fired soaking pit for larger workpieces and for smaller workpieces induction heating is used. As the material is worked the temperature must be monitored to make sure it remains above the recrystallization temperature. To maintain a safety factor, finishing temperature is defined above the recrystallization temperature; this is usually 50 to 100 °C (90 to 180 °F) above the recrystallization temperature. If the temperature does drop below this temperature the material must be re-heated before more hot rolling. All of this above, just part of the hot rolling actually.

Hot rolled metals generally have little directionality in their mechanical properties and deformation induced residual stresses. However, in certain instances, non-metallic inclusions will impart some directionality and workpieces less than 20 mm (0.79 in) thick often have some directional properties. Also, non-uniformed cooling will induce a lot of residual stresses, which usually occurs in shapes that have a non-uniform cross-section, such as I-beams. While the finished product is of good quality, the surface is covered in mill scale, which is the forms at high temperatures. It is usually removed via pickling or the smooth clean surface; process, which reveals a smooth surface.  Dimensional tolerances are usually 2 to 5% of the overall dimension.

Hot rolled mill steel seems to have a wider tolerance for amount of included carbon than cold rolled, making it a bit more problematic to use as a blacksmith. Also for similar metals, hot rolled seems to typically be less costly.

Hot rolling is used mainly to produce sheet metal, rebar, wire rod or other products. In a words, hot rolling is very popular used in the steel industry.

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.

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Bar & Wire Rod Rolling Mill Production Line Process Flow (Complete Version)

Bar & Wire Rod Rolling Mill Production Line Process Flow (Complete Version)

1. Bar Rolling Mill Production Line Process Flow 

Billet acceptance → reheating → rolling →double length shear → cooling → shear → inspection → packaging → metering → warehousing

2. Process Flow of Wire Pod Production

Billet acceptance → reheating →rolling → laying head → bulk coil cooling → coil collection → coil pressing → inspection → packaging → metering → warehousing

The process of acceptance, reheating and rolling of billet in wire rod production is basically the same as that of bar mill production, but the cooling of wire rod is carried out by the scattered cooling roller. The cooled bulk wires need to be collected into discs by the coiler and then compacted by the coiler and packed in small discs. Then the inspection classification is packed into large bales and measured in storage.

3. Analysis and Treatment of Bar and Wire Rod Production Process Fault

Can not rolling

1. Causes: 

1.Rolled piece rotten head, split head, black head, etc. 

2. Improper or too small installation of inlet guide; 

3.There are sticky iron or foreign bodies in the inlet guide; 

4. The roll over angle is too large or too small; 

5.Rolling guide wheel does not rotate or bearing burns out; 

6.Roll does not turn due to breakage or connection; 

7.Improper adjustment of roll gap or unsatisfactory size of incoming material; 

8. Roll pass friction coefficient is too small (new pass), etc.

2. Analysis and Treatment and Preventive Measures

(1) Analyse the reason why the rolled piece is not in progress, strengthen the inspection of the head defect of the rolled piece and dispose of it in time;

(2) After installation of the inlet guide, measure the width and dimension of the inlet cavity with the internal caliper; Illuminate with light and check whether the inlet guide is centered on the hole pattern from the outlet direction and tighten the guide bolts;

(3) Check and measure the solid size of the rolled piece with calipers to ensure the correct size of incoming material;

(4) Roll gap size is strictly adjusted according to rolling requirements;

(5) Check rolling guide wheel and twist outlet frequently and replace in time; Check import guide regularly for sticking of iron night and depositing of iron oxide scale or debris;

(6) New hole pattern shall be tested with small material first.

Rolling Heap Failure

Steel heap failure refers to stagnation after accumulation of rolled pieces between rolling mills or rolling mills, which is called steel heap failure.

1. Causes

A. The size and section area of incoming roll are too large; The rolled piece itself has surface or internal quality defects.

B. The friction coefficient of roll pass is not enough, causing slippage of the rolled piece;

C. Volume flow per second of incoming mill is greater than that of receiving mill.

D. Electrical control system is wrong or out of control.

E. Installation of mechanical running part or photoelectric control instrument of automatic looper system is wrong, out of control or out of function.

2. Analysis and Treatment and Preventive Measures

A. Adjust the size and area of incoming material to satisfy the reasonable continuous rolling constant relation;

B. Monitor the running condition of the rolled piece dynamically and tightly and adjust it in time;

C. Ensure the quality of the ingot; Disposal of semi-finished rolled parts with quality defects in time;

D. Check the rotational speed, looper system and electrical control system of each rolling mill regularly to ensure the stable and normal running equipment and electrical control system.

Steel Pulling Failure of Rolled Parts

Steel pulling failure refers to the phenomenon that the rolled pieces are too tight or broken between rolling mills or rolling mills, which is called steel pulling failure. Due to the failure of steel drawing, the dimension of the rolled piece often changes, and even the shape dimension or roundness of the finished product is out of tolerance, causing scrap.

1. Causes

A. The size and section area of incoming roll are too small;

B. Volume flow per second of incoming mill is less than that of receiving mill.

C. Electrical control system is wrong or out of control.

2. Analysis and Treatment and Preventive Measures

A. Adjust the size and area of incoming material to satisfy the reasonable continuous rolling constant relation.

B. Ensure that the electrical and electronic control equipment systems work properly.

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 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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