Views:2 Author:Site Editor Publish Time: 2021-09-16 Origin:Site
The quality of the roll is good, the life cycle of the roll is longer, and the number of rolls consumed is less, and vice versa. The wire rod mill compared the materials of the rolls according to the characteristics of the rolling mills used. The rolling mills of the wire rod mill are divided into rough rolling mill trains, intermediate rolling mill trains, and finishing mill trains. Each train has different rolling tasks during steel rolling, and has different requirements on the performance of the rolls. Generally, the strength of the rolls should be considered for rough rolling, and forged steel is often used. And cast steel rolls, or use spheroidal graphite semi-chilled and spheroidal graphite chilled rolls. Forged steel and cast steel rolls have high strength and are not prone to roll breakage, but their hardness is low, wear resistance is poor, the service cycle is short, and the rolls are replaced frequently; the graphite cast iron roll has graphite in the working layer of the roll body, which makes the roll wear resistant. , The thermal crack resistance has been improved, which is better than forged steel and cast steel rolls. Therefore, the wire rod mill chooses medium nickel, chromium, molybdenum infinite chilled cast iron rolls under the premise of meeting the strength requirements for rough and medium rolling; finishing mills The wear resistance of the rolls is mainly required, so medium nickel, chromium, and molybdenum infinite chilled cast iron rolls are selected, and the performance of the composite centrifugal roll is better than the conventional roll in meeting the production technical requirements. Therefore, the rolls of the wire mills all use composite centrifugal rolls.
Rolls can be divided into forged steel, cast steel and cast iron rolls and special rolls according to their materials. According to different casting methods, they can be divided into conventional casting rolls and composite centrifugal casting rolls; in order to improve the wear resistance of the rolls, a certain proportion can also be appropriately added. Alloying elements, such as medium nickel, chromium, molybdenum, etc. Roll management refers to a series of work from the selection of roll material, the formulation of roll procurement plans, the processing and management of roll pass patterns, the processing and inspection of roll passes, and the determination of roll processing and turning times. It is systematic.
The work of implementing fine management of rolls. Its characteristics are: (1) It is systematic and continuous; (2) It is theoretical and practical; (3) It must be interlocked, precise and reasonable.