Application Of A Superfine Ti(C,N)-based Cermet Material In Cutting Tools

With the expanding application of important strategic materials,rare metals W and Co,over-exploitation of resources,material prices and provision are extremely unstable.Therefore,it is of great strategic significance to replace or partially replace WC-based cemented carbide without Co or less Co,without W or less W.In recent years,China has made great progress in the research and development an d manufacture of Ti(C,N)-based cermet tool materials.However,in China the cermet blades used in cutting tool market still rely mainly on imports,and the proportion of cermet blades independently developed is small,and the market share is less.Of course,the gap in the performance of self-developed cermet is the main factor of restricting the application and market share of cermet products.However,few studies on the application characteristics of specific cermet grade products,the inconsistent matchi ng between product application requirements and quality control standards,and the high production cost of products are also indispensable links and It is also a concern for cutting tool manufacturers.This article mainly studies the following:(1)The process problems in the preparation of ultra-fine Ti(C,N)-based cermet materials were studied.The surfactant and the grain growth inhibitor are added during the wet milling stage to obtain an alloy having uniform crystal grains and fine particles.The analysis verified the effect of sintering atmosphere on the properties and surface defects of the alloy.An ultra-fine Ti(C,N)-based cermet material was prepared.(2)The grinding process of ultra fine Ti(C,N)-based cermet was studied.Factors affecting the blade edge integrity during grinding are analyzed.The analysis focuses on the relationship among the grinding efficiency of the cermet insert,the quality of the edge after grinding,and the surface quality of the workpiece after machining.For a SE1203,the grinding process parameters of high-efficiency grinding and high cutting edge quality are obtained.(3)Through the cutting experiment,the influence of tool wear mechanism and cutting parameters on the life of ultra-fine Ti(C,N)-based cermet tools was analyzed,and it is concluded that the influence of each parameter on the life of the newly developed cermet blade has the following rules:the effect of line speed and depth of cut on the life of cermet inserts has the same effect on the life of cemented carbide inserts;feed has a significant impact on blade life,and blade life drops dramatically as feed increases.(4)A comparative analysis of commonly used blade materials was carried out to determine the difference between the developed ultra-fine Ti(C,N)-based cermet products in the turning application and the current major coated carbide grades.The cermet insert has good resistance to crater wear in the finished P-type material with small cutting area.The blade has low affinity with the workpiece material an d can achieve good surface quality of the workpiece.In semi-finishing areas with a slightly larger cutting area,CVD coated inserts have an absolute advantage,and cermet inserts have a longer life than PVD coated inserts.This work provides a basis for the selection of cutting grades and the application of newly developed cermets in the company's brand system and the recommendation of cutting parameters.