No1. LMM GROUP
Chinese Mill Rolls Manufacturer，Founded in 2007, LMM GROUP mainly produces all kinds of metallurgical rolls for various types of steel, bar, high-speed wire and strip hot and cold plate and strip rolling mills.
The company covers an area of 100,000 square meters, including two complete production lines for cast rolls and forged steel rolls, processing workshops, product research and development centers, testing centers, training centers and office buildings and other supporting facilities. The factory environment is very beautiful.
LMM have been supplied to world’s top steel manufacturer Arcelormittal, TATA Steel, NLMK, MMK, etc. We do OEM for Concast and Danieli for a long time.
No2: Us korea hotlink, is a Korean roll manufacturer.
No3：JAR, is a Japanese roll manufacturer
No4: kathuria, is an indian mill roll manufacturer
No5: Deemrolls, is an indian mill roll manufacturer
How to choose a mill rolls？
The mill rolls is the main working part and tool for the continuous plastic deformation of metal in the rolling mill. A good mill rolls should have a good match between its strength, wear resistance, thermal crack resistance, smoothness and other various performance indicators.
In this way, it is not only durable under normal rolling conditions, but also less damaged when some abnormal rolling conditions occur. Therefore, when manufacturing mill rolls, the metallurgical quality of the mill rolls must be strictly controlled or supplemented by external measures to enhance the bearing capacity of the mill rolls.
The quality and design technology of the roll is related to the efficiency of the production line. Choosing the right mill rolls manufacturer is the most convenient way.
The selection of mill rolls should refer to several main properties:
1. Hot crack
Generally, the main requirements for rough mill rolls are strength and thermal cracking resistance; the mill rolls weight of the small 20 rolling mill is only about 100 grams, while the weight of the back-up rolls of the wide and thick plate rolling mill has exceeded 200 tons. When selecting products, first of all, according to the basic strength requirements of the rolling mill, select the main material for safe load.
2. Wear-resistant.
However, the speed of the finishing roll is high, so the rolled product must have a specific surface quality, and its hardness and wear resistance are the main requirements. Then consider the wear resistance of the product when it is used. Since the wear mechanism of the product is very complex, including mechanical stress, thermal action during rolling, cooling action, chemical action of lubricating medium, etc., there is currently no unified index to comprehensively evaluate the wear resistance of the product. Since the hardness is easy to measure and can reflect the wear resistance under certain conditions, the radial hardness curve is generally used to approximate the wear resistance index of the roll.
3. Shockproof.
In addition, there are some specific requirements for the product, such as strong bite force and impact resistance when the weight reduction is large;
4. Finish.
When rolling thin-gauge products, there are strict requirements on the hardness, uniformity of structure and performance, processing accuracy and surface finish of the product.
5. Cutting performance.
Mill Roll manufacturing said that when rolling steel with complex cross-sections, the processing performance of the working layer of the roll body should also be considered. Some customers think that as long as the model, specification and material are the same, mill rolls should be selected according to the price, and the one with the lower price will be selected. In fact, this is not necessarily accurate.
In fact, the price of the mill rolls can only be used as a part of the reference. The core and sleeve of the cast roll can only be selected after a comprehensive evaluation of the overall performance of the cast roll. The surface roughness of the roll, whether the working time is long, the number of turning and grinding repairs, and the frequency of changing the roll sleeve were investigated.
Even if the models, specifications and materials of A and B mill rolls are the same, the price of A mill rolls is 10% higher than that of B mill rolls. Casting A roll can work at full load for 35 days, and B mill rolls can work at full load for 30 days. Roller core A needs to be replaced after 8 times of turning and grinding, and roller core B needs to be replaced after 10 times of turning and grinding. Roller core A will not have any problems for 5 years. The roller core of b will be readjusted in less than 2 years. The rolling quality of A is intuitively better than that of casting roll B. Of course, A will be chosen. Because the casting roll bears a high load, the hardness and wear of the product will also be higher, and the working hours will be longer. Who is more powerful: The roller sleeve will be ground by car after working for a period of time, and it will be scrapped after more times of car grinding. The roller core has been used for a long time and needs a series of repairs such as cleaning and surfacing, which also need to take into account the cost.
In addition, the roll rolls repeatedly, sometimes heated and sometimes cooled, and the temperature changes greatly. There are thermal fatigue cracks, roll aging, and roll surface cracking or shrinkage for a long time. In addition to high wear resistance and hardness requirements, the roll should also have excellent resistance to oxidation and thermal fatigue.
Mill rolls manufacturing is a reminder that a roll is used not once, but countless times. The surface of the roll is required to have high wear resistance. If the material is required to be high, the price cannot be considered alone.
LMM high-speed steel rolls have good wear resistance, and the amount of steel (times) passed by each groove saves time for mill rolls change, improves the operating rate of the rolling mill, reduces mill rolls consumption, and improves the overall efficiency of the factory.
