The stress of Raymond mill accessories and the extrusion load of grinding are easy to cause cracks in the martensite structure. When the eutectic carbides are precipitated along the grain boundary into a network, their brittleness will promote crack propagation, and the existence of retained austenite will cause this problem. The crack extension is well prevented. Therefore, in our production, we need to do daily maintenance for the use of Raymond mills. Let us introduce in detail how to reduce the wear rate of the Raymond mill rollers.

The wearing parts of Raymond mill are grinding sticks, grinding rings, and assemblies. The grinding sticks need to be replaced after the Raymond mill has been used for hundreds of hours. Many users know this, but many problems that occur during the use of mills cannot be solved. Raymond mill rollers and disc linings are generally made of high-chromium cast iron or nickel-chromium alloys, but such materials often break, resulting in very serious losses, especially the loss of production stoppages, which cannot be estimated.

This needs to be analyzed, the influence of hardness and fracture of Raymond mill raw materials, the influence of heat treatment and fracture of accessories after processing raw materials, and the influence of mutual friction and fracture of accessories. According to the company's years of experience in the production of Raymond mills, the following solutions are made for the above situation. Wear resistance of Raymond mill accessories is our goal. We all know that the harder the product, the more wear-resistant it is, so it seems very simple to make more wear-resistant grinding rollers and grinding discs, because you only need to try to improve its hardness. Therefore, many foundries advertise that the chromium content of their accessories reaches 30%, and the HRC hardness reaches 63-65, but in fact this is not the case.

The higher the hardness, the more the number of carbides (Cr7C3) contained in the accessories, the more dispersed the distribution, the greater the probability of forming micro-holes and micro-cracks at the interface between the matrix and the carbide, and the greater the probability of fracture. And the harder the item, the harder it is to cut. Therefore, casting a product that is both wear-resistant and not easy to break is not as simple as imagined.