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.

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The Usage Of Water In Rolling Mill Machines

The Usage Of Water In Rolling Mill Machines

With the development of the steel industry, more attention is paid to the protection of mechanical machines, such as roughing machines, reversible rolling mills, pre-finishing rolling mills, finishing rolling mills, and wire-rod mills. Therefore, most of the water used in the iron and steel industry is used for cooling, protecting equipment, and improving the working conditions of the employees. The Health and safety of the employee require dust control, which is commonly accomplished by sprinkling water on floors and machines.

Water use in all types of hot rolling mills is mainly for scale removal and temperature control. When steel is heated to the high temperature desired for hot rolling, its surface is oxidized and a hard scale is formed. If not removed before rolling, this scale would be rolled into the steel and would cause surface defects.  A common method of scale removal is to spray water under a pressure of as much as 2,000 psi (pounds per square inch) against the steel immediately before it enters the rolls.

Cooling water is sprayed on the rolls during hot rolling to prevent distortion and reduce erosion of the roll surfaces. Because considerable heat is produced by the rolling processes, water also serves to keep the steel at its proper rolling processes. Upon emergence from rolling mills, steel may be sprayed with water to hasten cooling. This spray prevents excessive scale formation. Roll bearings also require cooling. Spent cooling water flows to the scale pit along with that used for scale removal and may be reused after clarification and cooling.

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The Characteristics Of Horizontal Rolling Mill And Tandem Rolling Mill

The Characteristics Of Horizontal Rolling Mill And Tandem Rolling Mill

The horizontal rolling mill is mainly used for the production of various sections of steel, narrow hot strips, and small billets. The following are the main features of the horizontal rolling mill :

(1) A row of rolling mills is driven by a motor. The rolling speed of each rolling mill is the same, and the rolling speed cannot be increased as the length of the rolling stock increases, so the output is low and the labor productivity is low;

(2) The structure of the rolling mill is generally three-roller or two-roller alternate;

(3) The rolling mill operation mode is mostly shuttle rolling or loop rolling. With flexible deformation and strong adaptability, each rolling mill can roll several times. The product range is wide and the operation is relatively easy;

(4) The rolling mill equipment is simple, with less investment and quick construction.

The tandem rolling mills are arranged in a row according to the rolling direction of the rolling stock. The rolling stock is only rolled once on each rolling mill. Each rolling mill is driven separately. Each rolling mill has different rolling speeds, that is, the rolling speed of the rolling rolls can be related to the rolling stock. The reduction in the section or the increase in the length of the rolled piece increases. Therefore, compared with the horizontal rolling mill, the rolling mill has the advantages of short gap time, high production efficiency, and less auxiliary equipment.

However, when this kind of rolling mill works, the rolling stock sequentially enters each rolling mill without forming a continuous rolling relationship, and the rolling stock is lengthened as the number of rolling passes increases, and the distance between the racks increases as the length of the rolling stock increases, so Longitudinal mills occupy a longer plant. This type of rolling mill is only suitable for large and medium-sized steel production. In order to overcome this shortcoming, the tandem mill was further developed into an off-road and a chess mill.

In cross-country rolling mills and staggered rolling mills, the head and tail of the rolling stock are alternated in different passes, which means the upper head becomes the tail of the track, and the tail of this track becomes the next head again. The rolling stock has lateral movement during the rolling process. The arrangement of the cross-country rolling mills and staggered rolling mills is more concentrated, which overcomes the shortcomings of the long mill. These mills also have a fast rolling speed and are suitable for the production of large, medium, and small complex sections of steel such as I-beam, channel steel, and H-beam.

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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Features of Plate Surface Quenching Equipment

Features of Plate Surface Quenching Equipment

1. The control system of the plate surface quenching equipment adopts PLC control, with the fast dynamic response, high-temperature control accuracy, strong programming function, professional customized man-machine interface, and highly user-friendly operation instructions.

2. The monitorable system provides a man-machine interface, real-time display of system working status, and adjustable parameters.

3. The plate quenching furnace is controlled by an intermediate frequency resonant power supply, rectification is fully open, and the power factor is high.

4. The cooling method of the plate surface quenching equipment adopts the advanced and reliable heat pipe self-cooling method, which has high cooling efficiency and reliable operation, which effectively guarantees the normal operation of the plate surface quenching equipment.

5. The plate surface quenching equipment adopts a closed-loop temperature control system, and the American Leitai infrared thermometer and German Siemens S7 form a closed-loop control system.

6. Strict hierarchical management system, medium frequency induction heating equipment has a one-key restoration system.

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Factors of Slowness of Cold Rolling Mill

Factors of Slowness of Cold Rolling Mill

For the manufacturing of rolling mills, no matter what kind of machinery and equipment, the speed of production is very important, so the speed of cold rolling mills is also the same, if there is no speed in the entire production process Then, the production of the product will definitely lag behind, which will have a very serious impact on the enterprise, mainly including economic impact. What factors will directly affect the low speed of the cold rolling mill?


The first is the influence of the material: because there is friction between the rolled material and the work roll in the cold rolling mill, then the speed will also have a corresponding effect, so work in such situations At the time, the amount of lubricating oil will also increase, and it will cause changes in the mode of lubricating oil.


Second, the impact of the cold rolling mill itself: if the cold rolling mill is adjusted faster in mechanical rolling speed, then a larger number of roll necks will appear in the bearing, which will also seriously affect The movement of the roll.

In the process of rolling mill operation, the cooling water will directly cause the screw nut to rust and increase its friction, mainly because the working environment is relatively poor, reducing the service life of the screw nut. Shortening, in order to effectively ensure the transmission accuracy of the screw nut in the reverse direction, and the processing accuracy of the screw nut, the best way is to improve the cooling and lubrication of the rolling mill and add a dust cover to the screw nut. This can achieve the effect of waterproof and breathable.

Please contact stella@hanrm.com for a quotation.
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Email: stella@hanrm.com   stellarollingmill@gmail.com
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