Study on the use and maintenance of small and medium-sized centrifugal rolls


Time:

2021/12/20

Medium and small centrifugal rollDuring the working process, it will bear a high rolling load, and at the same time, bending, torsion and friction often occur between small and medium-sized centrifugal rolls. After using for a certain period of time, the surface needs to be polished to remove defects such as surface pits, roll marks, cracks, etc., and gradually remove the fatigue layer while repairing the roll curve. The material of the roller is a polymer consisting of an iron-based solid solution and alloy carbides. At present, Cr5 rollers are widely used, and the single grinding amount is 0.2-0.3mm. If the small and medium-sized centrifugal rollers cannot be meshed at one time, the grinding amount after processing will exceed 0.1mm.

In addition to the mechanical equipment of the grinder, the key media and consumables for small and medium-sized centrifugal roll grinding are metal cutting fluid and grinding wheel. With the improvement of surface quality, higher requirements are put forward for metal cutting fluid and grinding wheel. Metal Cutting Fluid Demand

It has good chip sedimentation, excellent cooling and cleaning properties, and reduces roll surface scratches. Select the appropriate grinding wheel model and grinding process parameters to ensure roller profile problems, surface vibration lines, transverse thread lines, surface scratches, etc. does not occur during the grinding process. ForMedium and small centrifugal rollGenerally, corundum grinding wheels are used. According to the material of small and medium-sized centrifugal rolls, matching corundum grinding wheels can achieve higher surface quality and grinding accuracy. The roll shape problem is usually mainly caused by the grinding wheel being too soft.

The roller surface vibration defects such as too hard grinding wheel or too high feed speed and lateral movement speed may occur, which need to be solved by reducing the linear speed of the grinding wheel, reducing the feed rate, reducing the lateral movement speed and increasing the roller speed. When the grinding wheel is improperly corrected or the feed speed and lateral movement speed are too high, lateral threads will appear, also called feed mode. When the grinding wheel is too soft, the coolant filter fails, and abrasive particles float in the coolant, it will causeMedium and small centrifugal rollSurface wear point defects. It is necessary to check the coolant filter, increase the speed of the grinding wheel, reduce the roller speed, and reduce the feed. The grinding wheel is too hard, the self-sharpness is poor, the passivated sand grains are not easy to fall off, and the surface of the grinding roller is easy to scratch. It is necessary to increase the speed of the grinding roller and reduce the linear speed of the grinding wheel.