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What are the main performance requirements of rolls? How to choose?

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What are the main performance requirements of rolls? How to choose?

  • Time of issue:2022-10-13 11:03

What are the main performance requirements of rolls? How to choose?

  • Time of issue:2022-10-13 11:03
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        The roll is the main working part and tool for the continuous plastic deformation of metal in the rolling mill. According to the roll manufacturer , its main performance requirements are:

  1. Hot crack. Generally, the main requirements for rough rolls are strength and thermal cracking resistance; the roll 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. 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, 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.

According to   the roll manufacturer , in fact, the price of the roll 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.

  According to the roll manufacturer , even if A and B rolls have the same model, specification, and material, the price of A roll is 10% higher than that of B roll. Casting A roll can work at full load for 35 days, and B roll 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. There will be no problem with the roller core for 2.5 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 B casting rolls, of course A will be chosen? Because the casting roll bears a high load, the hardness and wear of the product are also higher, and whoever works for a long time. 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.

Roll 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.

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Lianqiang metallurgical roll

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