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Technical Article

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Use and management of the rollers

1. Brief introduction of roll use technology:

Roll use technology refers to the general term for the scientific management methods and skills used by various relevant departments to ensure the operating rate of the rolling mill, improve the quality of the rolled material, and reduce the cost of use.

 

2. The main function of roll use technology:

Improve the efficiency of the rolling mill: By monitoring the physical quality of the rolling rolls in use and standby, reduce the accident rate of rolls on the machine, reduce the rate of unplanned roll changes, ensure the implementation of various new rolling processes, use scientifically to extend the roll change cycle, and give full play to the rolling mill’s Maximum efficiency.

Ensure the quality of the steel plate: through the roll surface quality stability monitoring technology, the best roll shape control technology, the uniform wear control technology, the roll surface strengthening technology, etc., the auxiliary rolling control system rolls out the shape, surface quality, and performance qualified Steel plate.

Reduce the cost of roll use: The roll use technology starts with the purchase of rolls, through continuous revision of personalized procurement standards, and continuous updates to reduce non-productive consumption. In addition, methods such as improving the operation rate and convenience of management of the equipment in the roller room, and optimizing the number of rolls in turnover and inventory are also direct methods to reduce the cost of rolls.

 

3. The entry point of roll use technology research

Roll use technology should first start with the manufacture of rolls. As the research on roll use technology lags behind the development of steel rolling technology, roll manufacturers have not considered how to improve and guarantee the operating rate of rolling mills and improve the quality of steel plates in the process of developing new products, and lack the refinement of non-productive roll consumption. Analysis and comparison of the price performance of new products, the research results of roll on-machine failure analysis and accident failure analysis have not played their due role in the dynamic quality control of roll manufacturing and the research and development of personalized varieties. Roll manufacturers are more pursuing the technical indicators specified in the industry standards. Roll application technology is a comprehensive and practical technology involving a wide range of factors, so it must be studied upstream and downstream. Establish good communication channels and strategic cooperation with roll manufacturers, realize information sharing, and help manufacturers continuously improve the use performance of rolls. At the same time, roll manufacturers should innovate and develop after-sales services that are closer to steel rolling, guide the rational use of rolls, develop roll repair and reuse technologies and services, especially for large wide and thick plate rolls that cannot be produced in China, and enter the rolling mill to better Dominate the market.

 

4. Roll management

As a part of the technology of roll use, the management of rolls has always been valued by steel mills. Establishing a complete computerized roll management system, rolls have a long service life, and their own value and maintenance costs are much higher than other production spare parts for steel rolling. In addition to the turnover rolls, accident rolls, stock rolls that maintain daily production, there are also lagging rolls (widow rolls), repair rolls, etc. These rolls have different management methods such as processing procedures, use costs and consumption statistics, and they also occupy a large amount of flow. Funds and venues. Applying a computer to track the whole process and deal with it in time is the basis for scientifically managing rolls and reducing roll usage costs. The management of rolls mainly includes the following:

(1) Roll management begins with the rolls being placed in inventory. They must be classified according to roll types and placed neatly on the special storage racks for rolls to facilitate delivery and pick-up. They should not be placed in the open air or on damp ground;

(2) Complete and detailed records should be established for rolls out of storage and unpacking, generally including the following: roll number, supplier, roll material, chemical composition, hardness, etc.;

(3) When entering the production site, the rolls should be easy to find and transport, and pay attention to rust prevention and collision prevention;

(4) Roll turning and grinding should be recorded accordingly. For example, before and after grinding (turning), that is, the diameter of the roll body, the condition of the roll surface, the hardness, the online wear and the amount of grinding, etc. before and after the grinding (turning), the grinding or turning After the roll is not on the machine, the roll body must be protected against rust to prevent rust and reduce accuracy;

(5) The use of rolls on the machine should record the stand of the roll on the machine, the roll number of the paired roll, the time on the machine, the time of off the machine, the rolling volume (tonnage or kilometers), the type of rolled material, whether there is any abnormality in the rolling process, and whether it is normal Scrap, etc.;

(6) The analysis of the reasons for scrapped rolls includes rolling operation reasons and roll manufacturing reasons, which should also be an important content of roll management;

(7) Establishing a complete and detailed roll management account is very important for analyzing the effect of roll use, whether the rolling and grinding operation is reasonable, and analyzing the cause of the accident.

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| TIME: 2021.09.17    VIEW: