During the hot rolling process, the work rolls and backup rolls work together to shoulder the task of rolling metal. The work rolls directly contact and deform the metal blank, while the support rolls provide the necessary support and stability to prevent the work rolls from deforming. The two work together to ensure the smooth progress of the rolling process and the production of high-quality hot-rolled steel.

Application of Work Rolls in Hot Rolling Process
Work rolls are one of the most important types of rolls in the hot rolling process. Their main function is to directly contact the metal during the rolling process to deform the material. The following is the detailed application of work rolls in the hot rolling process:

1. Material deformation
Direct contact with the metal blank: The work roll is in direct contact with the heated metal blank, exerting huge pressure to thin the thickness and extend the length of the metal blank.
Multi-pass rolling: Hot rolling usually requires multiple passes, with each pass using work rolls to further compress and deform the metal blank to achieve the desired size and shape.
2. Heat conduction
Heat transfer: Since the work roll is in direct contact with the high-temperature metal blank, it must have good thermal conductivity and be able to withstand and dissipate the high-temperature heat from the metal blank to prevent deformation or wear caused by excessive temperature on the roll surface.
Thermal stability: The work roll needs to have good thermal stability, maintain its mechanical properties and dimensional stability in high temperature environments, and avoid surface cracks or peeling caused by thermal expansion and contraction.
3. Surface quality
Surface finish: The surface finish of the work roll directly affects the surface quality of the hot-rolled steel plate or strip. A smooth roll surface can reduce friction and surface defects during the rolling process and improve the surface quality of the finished product.
Wear resistance: Highly wear-resistant roller surface materials and coatings can extend the service life of the work roll, reduce the frequency of replacement, and improve production efficiency.
4. Roll gap adjustment
Roll gap control: In the hot rolling process, the roll gap adjustment between the work rolls is crucial to control the thickness of the steel plate or strip. By precisely adjusting the roll gap, the thickness uniformity and dimensional accuracy of the rolled products can be ensured.

Application of Backup Rolls in Hot Rolling Process

Backup Rolls are another key type of roll in the hot rolling process. They are mainly used to support and stabilize the work rolls and prevent them from deforming due to high pressure during the rolling process. The following is the detailed application of support rollers in the hot rolling process:

1. Prevent work roll bending
Withstand high loads: During the hot rolling process, the work rolls bear huge rolling pressure. The support rolls are located behind the work rolls to provide additional support to prevent the work rolls from bending and deforming due to high pressure.
Maintain roll gap consistency: By preventing work roll bending, backup rolls help maintain roll gap consistency and uniformity, ensuring uniform thickness of the rolled product.
2. Extend the life of work rolls
Reduce wear: The support roller shares part of the pressure and load of the work roll, reducing the wear and fatigue of the work roll, thereby extending the service life of the work roll and reducing the frequency of shutdown replacement.
Reduce surface defects: By stabilizing the work rolls, the backup rolls reduce the vibration and impact generated during the rolling process, thereby reducing surface defects and improving the surface quality of the rolled products.
3. Mechanical strength and toughness
High-strength material: The support roller is usually made of high-strength material, which can withstand high pressure and high load, ensuring stable support during the rolling process.
Toughness and durability: The support roller needs to have good toughness and durability, and can work under high stress conditions for a long time without breaking or fatigue failure.
4. Heat treatment and manufacturing accuracy
Precision machining: The manufacturing of support rollers requires high-precision processing technology to ensure that their external dimensions and roundness meet the requirements and provide stable support effects.
Heat treatment process: Through appropriate heat treatment process, the hardness and fatigue resistance of the support roller are improved to ensure its stability and durability in high temperature and high pressure environments.

ABOUT LMM GROUP

LMM is the professional manufacturing plant, Founded in 2007, which is producing and supplying metallurgical rolls for iron and steel industry. The registered capital of the company is RMB 112,383,000,the total assets more than 1,000,000,000 and the company covers area of 400,000 ㎡ with staff more than 1000.

LMM GROUP is one of the professional roll manufacturing base in China, which supply all kinds of large-size rolls for iron and steel enterprises with production capacity of 100,000 tons of all kinds of hot strip mill rolls, section mill rolls, rod mill rolls, cold rolling mill rolls, casting and forging backup rolls.

Product advantages

LMM GROUP’s roll production technology originates from United Electric Steel’s Davie Company in the United States, which has developed the world’s most advanced metallurgical powder technology, making the metallographic structure more dense.

  • Good economic benefits
  • Stable rolled strip profile
  • Good surface quality
  • High dimension accuracy
  • Expert technical advise
  • Good wear resistance
  • Prolonged service period
  • High safety factor

Casting production of rolls

The company adopts conventional casting、grooved mould casting and centrifugal casting(horizontal、vertical)methods for roll production. The major production process is adoptive of advanced computer control technology and the system is automatically controlled, which ensures homogeneity of process Control and homogeneity of product quality.

The maximum dimension of rolls produced by the large vertical spin-caster is φ1350×5300×11000, which meets the requirement of hot plate mill and CSP mill work rolls.

The company can supply customer with high wear resistance and stablity, high-strength quality rolls .

Heat Treatment of Rolls

Heat treatment furnaces are independently numerically controlled and centrally computer controlled.Heat treatment of strip mill rolls is adoptive of process and technology imported from Davy Roll UK.

Machining of Rolls

Advanced high-accuracy machine tools plus experienced turning techniques and control technology meet high requirements demanded by roll manufacturing accuracy.

Inspection of Rolls

The company set up”roll inspection & research center”, quality control of rolls and inspection are carried out .

LMM GROUP have been supplied to world’s top steel manufacturer :

Australia: Liberty steel/Bluescope steel
Iran: Oxin steel
Italy: JSW steel
United Arab EmiratesEmirates Steel
Egypt:Ezz Steel
Russia:MMK,Mechel, NLMK
Luxembourg:RIVA Group,ArcelorMittal
Turkey: Tosyalı Holding,İçdaş,Erdemir Group
Spain: Liberty Steel Group,CELSA Steel Group
India: tata-steel,SAIL, SPL,Erdemir Group etc. We do OEM for Concast and Danieli for a long time

Pre-Sales Service

* Inquiry and consulting support.

* Planning layout and Design requires machinery

* Welcome visit our Factory.

* The production process and before leaving the factory, all performance indicators are strictly tested, and the professional QC team controls according to the process.

After-Sales Service

* Engineers available to service machinery overseas.

* IN-TIME delivery goods.

* The quality is tracked throughout the process, and the installation and use are guided throughout the process.

* Long-term technical support.

* Stick to the agreement, do not do anything that violates the agreement, stick to the spirit of the contract to the end.

LMM GROUP is one of the professional roll manufacturing base in China, which supply all kinds of large-size rolls for iron and steel enterprises with production capacity of 100,000 tons of all kinds of hot strip mill rolls, section mil rolls, rod mil rolls, cold rolling m rolls, casting and forging backup rolls.

Please provide design data for special processing requirements