Research On High Stress Abrasive Wear Resistance Of Biomimetic Non-smooth Grinding Roller By Hardfacing

The cement industry has developed very rapidly recent years in China, cementproduction and demand is also increasing. High pressure grinding rolls (HPGR) is anessential equipment of cement production process, the grinding roller is a corecomponent of HPGR used for extrusion and cement clinker grinding. Grinding rolleris under huge pressure and suffering harsh abrasion in the process of operation, itssurface will receive a serious attrition in long-term use process. Thus prolong theservice life of the grinding roller to reduce the cement production cost is as importantas improving the cement production efficiency. Overlaying anti-friction material inthe surface of grinding roller is a commonly used method in actual production toextend its service life, as the work environment of these wear parts is extremely harsh,the service life of the components extends and the cost also rises greatly. Moreoverthe wear layer fracture and large detachment caused by lacking of toughness are stillnot resolved properly.Organism has formed a surface shape with special features in millions of yearevolution. Through the observation of soil organism like dung beetle and pangolin, wecan find that their surfaces are not smooth. Further studies have shown that thesenon-smooth surfaces provide the organism a series of nature such as good abrasionresistance, thermal fatigue resistance and desorption. Our research group used thelaser remelting technology to apply the biomimetic theory on molds, brake discs etc.and achieved a good result. So, this paper will apply the biomimetic non-smooththeory to the grinding roller. Apply hardfacing to surface treatment, preparebiomimetic non-smooth grinding rollers, explore its abrasive wear performance. This experiment investigated different unit forms, different unit compositions and thedifferent abrasion performance of the biomimetic non-smooth grinding rollersaffected by the different size of abrasives and put forward the abrasion mechanism ofbiomimetic non-smooth abrasive on this basis.The findings indicated that, the biomimetic unit with different forms hasdifferent microstructure due to differences in the dilution ratio. The microstructure ofspot units with a diameter of10mm,14mm,18mm are respectively hypoeutectic,eutectic and hypereutectic high chromium cast iron. The organization of striation,lattice and entire hardfacing samples are all hypereutectic high chromium castiron.Wearing test demonstrated that，the biomimetic non-smooth samples of striation,lattice units are inferior to the smooth hardfacing samples on abrasion performance,and the spot ones are all superior to the smooth hardfacing samples. Among these, thespot biomimetic unit non-smooth sample with a diameter of18mm shows the bestwear resistance. The wear weight loss decreased33%than that of smooth hardfacingsamples,68%than that of smooth untreated samples. This is because flinty hardfacingbiomimetic units effectively protect the softer matrix, and the tougher matrix can alsoalleviate the stress concentration of hardfacing biomimetic units. The interactionstructure of soft and hard greatly improves the properties of material. With theaddition of Nb, NbC generated in the unit and carbides become smaller and scatteredin the structure. Hardness of unit also improved. Among them the biomimeticnon-smooth samples made by6%Nb welding wire achieve the best abrasionperformance. The wear loss weight decreased49%than that of smooth hardfacingsamples. Using the welding wire containing Ti and W to prepare the biomimeticnon-smooth sample, TiC and W6C generated in the unit. Among them the units containing Ti have a higher hardness, reaching900Hv. Besides, its wear resistance isalso the best, Unit containing W has a lower hardness and its wear resistance is alsorelatively poor. The unit can effectively protect the matrix organization and reduce thewear when using larger abrasive.