Advantages of cast iron roll

2022-03-22 16:00

According to the roll manufacturer, the common structures in cast iron rolls can be divided into three categories: matrix, cementite and graphite. The matrix structures are mainly bainite, ferrite, pearlite, bainite and martensite. The shapes of graphite in cast iron generally include flake and spherical. Next, Wuxi Taihu roll Co., Ltd. will introduce cast iron rolls.

Cast iron rolls will bear high rolling load when working, and twists, changes and conflicts often occur between cast iron rolls. After a certain period of time, it is necessary to polish the surface, remove the defects such as surface pits, roll marks and cracks, and gradually remove the fatigue layer together with the repair of roll shape. The material of the roller is a polymer composed of iron-based solid solution and alloy carbide. Cr5 roller is widely used now, and the single grinding amount is 0.2-0.3 mm. If the small and medium-sized centrifugal roller cannot mesh at one time, the grinding amount will exceed 0.1mm after processing.

In addition to the mechanical equipment of grinder, the key medium and consumables for grinding cast iron roll are metal cutting fluid and grinding wheel. With the improvement of appearance quality, higher requirements are put forward for metal cutting fluid and grinding wheel. Metal cutting fluid demand

Cast iron roll

Cast iron roll has excellent chip sedimentation, excellent cooling and cleanliness, and reduces the scratch on the surface of the roll. Select appropriate grinding wheel type and grinding process parameters to ensure roll contour problems, external vibration marks, transverse thread marks, external scratches, etc. It will not happen during grinding. Corundum grinding wheel is generally used for small and medium-sized centrifugal rolls. Matching corundum grinding wheel according to the material of small and medium-sized centrifugal roller can achieve higher surface quality and grinding accuracy. Generally, the problem of roll profile is mainly caused by the soft grinding wheel.

Cast iron roll may have roller surface vibration defects such as too hard grinding wheel or too high feed speed and traverse speed. It needs to be solved by reducing the linear speed of grinding wheel, feed speed, traverse speed and improving roll speed. When the grinding wheel is not calibrated properly or the feed speed and transverse movement speed are too high, transverse thread, also known as feed form, will appear. When the grinding wheel is too soft, the coolant filter fails, and there are abrasive particles floating in the coolant, the defects of grinding points on the surface of small and medium-sized centrifugal rollers will be formed. Check the coolant filter of cast iron roll, increase the grinding wheel speed, reduce the roll speed and feed speed. The grinding wheel is too hard, with poor self sharpening, passivated sand particles are not easy to fall off, and the surface of the grinding roller is easy to be scratched. It is necessary to increase the speed of the grinding roller and reduce the linear speed of the grinding wheel.

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Cast iron roll