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Manufacturing method and prospect of centrifugal roll

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Manufacturing method and prospect of centrifugal roll

  • Time of issue:2022-09-13 17:27

Manufacturing method and prospect of centrifugal roll

  • Time of issue:2022-09-13 17:27
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 Centrifugal rolls for steel rolling production can be manufactured by forging, casting, powder sintering and other methods. Hot rolled work rolls are mainly cast rolls. In the past, the drum was not a composite structure, but a single material. In order to make the centrifugal roll have high performance, the roll has been developed into a composite structure roll with a high degree of freedom in the outer material. The casting methods of composite rolls mainly include centrifugal casting and continuous casting. The inner layer of the centrifugal roll is ductile iron, and the inner layer of the continuous casting composite roll is cast steel.

 

  Cold rolled work rolls are mainly forged rolls. Cast and forged rolls are made from a variety of materials. According to the material, adopt the corresponding roller manufacturing method. After rolling, the surface properties of the rolls change due to wear. At this time, the deteriorated layer on the surface of the roller can be removed by grinding and other methods, and the roller can continue to be used.  

  Centrifugal roll performance requirements:

  The strip hot rolling mill is divided into a rough rolling section and a finishing rolling section. The decoration part is divided into the front section and the back section. Since hot rolling is performed at high temperatures, the rolls are required to have wear resistance at high temperatures. Therefore, the main material of the centrifugal roll is a casting material containing a large amount of carbides. The rolling load and heat load of the rough cross-section roll are relatively large, and the roll material should be a casting material containing a large amount of carbides. However, starting with finish rolling, the material of each vertical roll can be changed to a material with a lower carbide content.

  Generally, centrifugal rolls using cemented carbide are rolls with a composite structure. The outer layer of the drum is made of hard material, so that the outer layer of the drum is wear-resistant and anti-orange peel. The inner layer of the roller is made of tough material, so the roller will not break due to torque and deceleration force. In rough rolling, due to its high reduction rate, large rolling load and high rolling temperature, materials with high strength and good heat resistance are selected. Finishing rolls are made of materials with good wear resistance and orange peel resistance. In addition, the rollers used in the finishing stage should be made of accident-proof materials. That is, when a rolling accident occurs in the late stage of finishing rolling, the roll will not be damaged due to deep cracks.  

  The development direction of centrifugal roll: 

  The front roll of the finishing mill emphasizes wear resistance and orange peel resistance. In order to improve the wear resistance of high-alloy rolls, alloy elements such as V are added to the steel, and high-hardness cemented carbide MC is used to improve wear resistance. The roll is an improved high alloy roll. The C content of high-alloy rolls and improved high-alloy rolls is about 3%, so the carbides in improved high-alloy rolls are mainly cementite except MC. In addition, the improved centrifugal roll structure contains a few percent graphite area ratio, which can lubricate the thermal bonding of the steel plate in the event of a rolling accident.

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