Research On Pore Characteristics And Turning Tools Of Iron-based Powder Metallurgy Parts

Powder metallurgy is the near-net forming process.One of its characteristics is that there is less and no cutting.However,undering current technical conditions,the parts made by powder metallurgy technology cannot achieve the purpose of direct use.So a small amount of mechanical processing is required.However,its cutting processing has always been a difficult problem in the production and processing of enterprises,and the problems of cutting tools in the actual processing process are endless.Iron-based powder metallurgy parts often cause the problem of rapid tool wear during the cutting process,which has a greater impact on the processing and production of enterprises.In order to deeply analyze the main reasons for rapid tool wear during processing,and to select suitable tools for the cutting of iron-based powder metallurgy parts,then to solve the waste of resources and economic losses caused by untimely tool change due to rapid tool wear during processing.Therefore,this article analyzes and studies the material properties and cutting characteristics of iron-based powder metallurgy parts.First of all,this article starts with the manufacturing process of iron-based powder metallurgy parts and analyzes the causes of rapid tool wear during the cutting process.It found that the powder particles in the press molding process,the compact part is formed unevenly distributed pore structure,pore structure which remains after completion of the sintering,so that the tool subject to continuous intermittent shock loads during cutting.Moreover,air is a poor conductor of heat,and the air inside the pores makes it difficult for the cutting system to dissipate heat,resulting in a series of rapid wear of the tool.After theoretical analysis,it is known that the main reason why iron-based powder metallurgy parts are difficult to process is the existence of pore structure,so the internal pore characteristics of iron-based powder metallurgy parts are analyzed.It is deduced that when the pore structure exists,the cutting model is established under the collision of the tip arc and the pore arc during the cutting process;By combining the finite element analysis and experimental analysis reveals that the processability of the iron-based powder metallurgy parts different from conventional metallurgical processing part;Due to its internal pore structure,the tool is frequently impacted during the cutting process,and the heat of the cutting system is not easy to escape,which causes great damage to the tool;Selecting different materials according to the internal pore characteristics of the cutting tool iron-based powder metallurgy,by simulation and experimental analysis over the final selection tool material and cutting parameters for machining of iron-based powder metallurgy parts(cone synchronizer rings).Finally,performing reliability experiments and analysis on the selected tools to ensure the reliability of the tools for machining iron-based powder metallurgy parts;Analyze the wear form of the tool after cutting,and establish a quantitative tool wear model based on the tool wear mechanism to predict the law of tool wear with cutting time;According to the actual production and processing conditions of the enterprise,then making a reasonable plan for the tool change to guide the production and processing in the enterprise.After theoretical analysis,it is found that the main reason for the difficulty of machining is the existence of internal pore structure.Therefore,this paper studies the internal pore characteristics of iron-based powder metallurgy parts and their influence on the cutting tool during the cutting process.Through theoretical analysis and simulation calculations,then combined with experiments,this article analyzes the influence of pore structure on cutting and the optimization of cutting tools for iron-based powder metallurgy parts.