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Performance requirements
thermal crack resistance
Generally, the main requirements for rough rolls are strength and thermal crack resistance. The working roll weight of the small 20-roll mill is only about 100 grams, while the support roll weight of the wide and heavy plate mill has exceeded 200 tons. When selecting the roll, first of all, according to the basic strength requirements of the rolling mill to the roll, select the main material for safe bearing (various levels of cast iron, cast steel or forged steel, etc.).
Hardness
The finishing roll speed is higher, the final product of rolling must have a certain surface quality, and its hardness, wear resistance and so on are the main requirements. Then consider the wear resistance of the roll when it is used. Because the wear mechanism of the roll is very complex, including mechanical stress, thermal effect during rolling, cooling effect, chemical effect of lubricating medium and other effects, there is no unified index for comprehensive evaluation of roll wear resistance. Since the hardness is easy to measure and can reflect the wear resistance under certain conditions, the wear resistance index of the roll is generally expressed approximately by the radial hardness curve.
Impact resistance
In addition, there are some special requirements for the roll, such as a large amount of pressure, the roll is required to have a strong bite ability, more impact resistance;
Finish
When rolling thin products, the rigidity of the roll, the uniformity of tissue properties, processing accuracy and surface finish are more stringent requirements;
cutting performance
When rolling steel with complex cross-section, the cutting performance of the working layer of the roller body should also be considered.
When selecting rolls, some performance requirements of rolls are often opposed to each other, and roll purchase and maintenance costs are very expensive. Therefore, we should fully weigh the advantages and disadvantages of technology and economy, and decide whether to use cast or forged, alloy or non-alloy, single material or composite material.
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2024-06-06
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