Analysis of Wear Mechanism of Vertical Grinding Roller

Summary

Roller mill is the main equipment in the grinding process. As the more important part of the mill, its performance directly affects the grinding effect of the m

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Roller mill is the main equipment in the grinding process. As the more important part of the mill, its performance directly affects the grinding effect of the mill. During the grinding process of the grinding roller, the material particles, abrasives and some impact loads will cause wear on the surface, which will affect the technical characteristics and service life of the grinding roller surface. Studying the wear mechanism of the grinding roller and finding a method to improve the wear performance of the grinding roller have an important effect on improving the wear resistance of the grinding roller and obtaining a good grinding effect.

Wear Analysis of Grinding Roller in Vertical Mill

Abrasion generally refers to the process of continuous loss of material on the surface or residual deformation when two objects in direct contact move relative to each other. In the grinding mechanism of the roller mill, the abrasion of the grinding roller is mainly caused by the direct contact between the material and the surface of the grinding roller, which causes wear during relative movement, resulting in material loss or residual deformation on the grinding roller surface.

1. Abrasive wear of vertical mill

The phenomenon that the surface of the material is abraded or the surface material falls off during the friction process by external hard particles or hard protrusions on the contact surface is called abrasive wear, also known as abrasive wear. Its main feature is the formation of scratches on the friction surface along the sliding direction. Such hard particles or protrusions may be non-metallic or metallic. In actual working conditions, the size of abrasive particles or protrusions. The range can vary from a few tons or larger and heavier rocks or minerals to a few microns of abrasive grains. Abrasive wear is a more common form of wear in production. According to statistics, the loss due to abrasive wear accounts for about half of the total wear loss, so reducing abrasive wear is of great significance.

2. Adhesive wear of vertical mill

When the surfaces of two objects slide relative to each other, adhesive contacts are formed due to the adhesive effect. These adhesive contacts undergo shear fracture, the sheared material may fall off into abrasive debris, or migrate from one friction surface to another friction surface. This type of wear is called For adhesive wear. Corresponding analysis, there is almost no form of adhesive wear in the wear of the grinding roller.

3. Corrosive wear of vertical mill

The friction surface chemically reacts with the surrounding medium to generate corrosion products. After further friction, these corrosion products will be worn away. Material damage caused by such repetition is called corrosion wear. During the work of the grinding roller, the surface friction will generate heat, which will cause the temperature of the roller to rise, but the temperature rise can be controlled by the cooling system. The grinding roller materials and materials will not produce corrosion products during the contact friction process, so there is no form of corrosion wear of the grinding roller wear.

4. Fatigue wear of vertical mill

During the rolling contact of two objects, surface contact fatigue occurs due to the effect of alternating contact stress, causing pitting or shedding on the surface of the material. During the wear of the grinding roller, the materials that continuously pass through the grinding zone and directly contact the surface of the grinding roller may produce alternating contact stress, resulting in a very small amount of contact fatigue on the surface of the grinding roller, and pitting or shedding.

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