Study On Wear Mechanism Of Coated Tools When Cutting Austenitic Stainless Steel

Austenitic stainless steel is difficult-to-machine material. It has the followingprocessing characteristics: the serious work-harden,the big cutting force,the hightemperature,etc. When cutting austenitic stainless,the general tools wear seriously,the tool life is short. Usually tool materials used for machining austenitic stainlesssteel are cemented carbide cutting tools, metal ceramic cutting tools and coatedtools. In order to discusse further the wear mechanism of coated carbide cuttingtools when cutting austenitic stainless steel, This paper studies the process of theYBG202coated carbide dry cutting austenitic stainless steel0Cr18Ni9.First of all, according to the test data records, the coated tools wear curve at adifferent cutting speed when cutting stainless steel is made. The results show that,with cutting speeds increase, the slope of curve of early tool wear is bigger, wear ismore intense.Secondly, this paper discusses the tool wear (breakage) form and mechanismof coated tool. it is thought in the test that the form of wear and breakage are flankwear,boundary wear and the tip of damaged.The wear mechanism of coated toolsare adhesion wear, diffusion wear and oxidative wear when cutting stainless steel.Among them, when the cutting speed is low, the tool failure standard is the tip ofdamaged, when thethe speed is high, it is flank wear.At last, the process of cutting austenitic stainless steel with coated cutting tool is simulated with the help of Abaqus.it is found that shearing Angle increase withthe cutting speed increasing, scraps degeneration coefficient decreases.Thisphenomenon verified that the reason of chip morphology change is the increase ofthe cutting speed. And the simulation results show that the tip stress concentration,it is proof that the main breakage form is the tip of damaged.