Comparison in material selection of Raymond roller mill accessories

The accessories of Raymond roller mill are grinding rods, grinding rings and assemblies. The grinding rods should be replaced after several hundred hours of use by Raymond roller mill. Many users know this, but many grinding machine in the process of the problems do not solve. At Raymond roller mill, high-chromium cast iron or nickel-chromium alloy is usually used for the material of the grinding roller and the lining plate of the grinding disc. However, this material often breaks, resulting in severe losses, especially those caused by discontinuation, which cannot be estimated. This is to analyze the effects of hardness and fracture of the raw material of Raymond roller mill, heat treatment and fracture of the parts after processing the raw material, friction and fracture of the parts. According to the company's perennial production experience of Raymond roller mill, the following solutions are made for the above situations.

 

65Mn(65 mn): the wear resistance of the grinding roller and the grinding ring has been improved obviously after using this material. This product features high hardness, good wear resistance and magnetic properties. It is mainly used in powder processing field where iron removal is required. After normalizing and tempering heat treatment, the mechanical properties of the product are greatly improved, which makes the product not only good wear resistance, but also great toughness.

 

Mn13 (13 mn) : compared with 65Mn, the wear roller and grinding ring have improved in durability after being cast with Mn13 material. This product was treated with water toughness after casting. The castings have high tensile strength, toughness, plasticity and non-magnetic after water toughness treatment. Make the grinding roller and ring more durable. When the surface is subjected to severe impact and strong pressure deformation in the process of use, machining hardening occurs on the surface and martensite is formed to form a high wear resistant surface layer, while the inner layer maintains excellent toughness and can withstand large impact load even if the wear is very thin.

 

Raymond roller mill parts wear is our goal, we all know that product more hard, more wear-resisting, so to make the wear-resisting roller and the mill seems very simple, because as long as you try to improve its hardness can, therefore, many foundries flaunt its casting chromium content of 30%, HRC hardness up to 63-65, but in fact is not the case. The higher the hardness, the more carbides (Cr7C3) in the casting, the more diffuse the distribution, the greater the chance of forming microholes and microcracks at the interface between the matrix and the carbide, and the greater the chance of fracture. And harder objects are harder to cut. Therefore casting both wear - resistant and not fracture of the product is not so simple as imagined.