农业机械学报2026，Vol.57Issue(14)：239-246,8.DOI:10.6041/j.issn.1000-1298.2026.14.022
激光熔覆Ni-WC的农用刀具磨损行为与自磨刃形成机制研究
Wear Behavior and Self-grinding Edge Formation Mechanism of Agricultural Tools Strengthened by Laser Cladding Ni-WC
摘要
Abstract
Crop stem cutting is a key step in mechanized harvesting,and the material design of the cutting tools directly affects their lifespan and the quality of crop cutting.The hardness and wear resistance of the integral cutting tools are low,and the tools is prone to chipping as the hardness increases.The self-sharpening edge technology can effectively solve this problem.The edge of cutting tool is composed of two or more materials,resulting in different wear resistance on two sides of the edge.During the operation a self-sharpening edge is formed,enabling the tool to remain sharp for a long time.However,systematic and quantitative analysis lacks on the mechanism of the self-sharpening edge formation.The reinforcement layer of Ni-WC was prepared on cutting tools by laser cladding to obtain self-sharpening.The microstructure,phase composition and hardness of the cladding layers were tested by using a metallographic microscope and X-ray diffraction.As the addition of WC the average hardness of the cladding layer increase,with the maximum reaching 979HV0.5.The tool samples were tested by using a friction and wear testing machine of agricultural machinery components.Then combining polarized light microscopy with binary image processing technology,the micromorphology of the worn cutting edge was quantitatively analyzed in order to obtain the evolution law of tool wear amount and cutting edge blunt radius.The wear resistance and thickness of cladding layer were two main influencing factors for the wear resistance and sharp edge retention of tools.When the WC content was 20%～30%and the cladding coating thickness was 0.6～0.8 mm,a self-sharpening edge can be formed.The field experiments were conducted to verify the results.Based on this,the criteria and formation mechanism for self-grinding edge were proposed.The research results can provide a reference for the design optimization of agricultural self-grinding edge cutting tools.关键词
农用刀具/激光熔覆/自磨刃/刃口钝圆半径Key words
agricultural cutting tools/laser cladding/self-sharpening edge/cutting edge radius分类
矿业与冶金引用本文复制引用
许令峰,邢延鹏,宋月鹏,郭晶,宋占华..激光熔覆Ni-WC的农用刀具磨损行为与自磨刃形成机制研究[J].农业机械学报,2026,57(14):239-246,8.基金项目
国家重点研发计划项目(2022YFD2001903)和山东省自然科学基金项目(ZR2023MC001) （2022YFD2001903）
