New superhard materials carbon nitride cutting tool – An Experimental Study superhard cutting tools, cutting tools – metal industry
In Machinery Manufacturing, Tools Cutting tool materials and machining efficiency and quality, has a decisive effect. Computer integrated manufacturing system advanced the emergence of a variety of refractory materials for applications in various industries, high-speed cutting and high precision cutting and processing, continuous development of green manufacturing, the tool made especially for a new cutting tool materials, the higher requirements.
Since the mid-20th century after the construction materials and application of emerging and non-metallic materials difficult to machine metals. Original use of the tool, such as high speed steel, carbide cutting tools and so could not do its processing requirements, so hard cutting tool materials have come into being.
Superhard cutting tool materials is only the first Diamond And cubic boron nitride (PCBN) are two. Human use of natural diamond from the start, then the successful development of synthetic diamond and cubic boron nitride, although the two materials has been widely used, but its price is high, molding and processing are difficult, with diamond cutting tools can not be processed black metal, limited application and popularization.
New cutting tool material CNx In recent years a new type of tool material carbon nitride. American physicist AMLin and MLCohen molecular engineering theory, design new superhard inorganic compounds CNx. According to the calculation of bulk modulus, the compound can reach close to or exceed the hardness of boron nitride and diamond.
Use de reactive magnetron sputtering process, domestic and foreign scientists in physics and materials in a variety of substrate materials deposited CNx superhard. Such films have high hardness, high wear resistance, low friction and strong heat conduction and other properties, and not with the chemical reaction of ferrous metals.
1.CNx mechanical properties of thin films
Domestic physicist in high-speed steel cutting tools and carbide cutting tools CNx films deposited on its surface hardness by measuring the 4000 ~ 7200HV. Shows that the hardness of the hardness of cubic boron nitride has been reached, but slightly lower than the hardness of diamond. Others have been measured with a scratch coating film adhesion CNx verify the standard requirements to achieve the JB/T8365.
2.CNx experimental surface coated tools
(1) CNx coated high speed steel cutting tools of drilling experiments
Author diameter 10.5mm of M2 (W6Mo5Cr4V2) high-speed steel twist drill, to CNx surface coating, coating thickness 3 ~ 5 m. Using the same before and after coating Drill In 38CrNi3MoVA (after quenching, hardness 36 ~ 40HRC) high strength steel on drilling, deep hole for the 12mm.
Cutting parameters: feed rate f = 0.13mm / r, rotational speed n = 600r/min, cutting speed v = 19.8m/min; without cutting fluid. This condition, drill a hole about every time-consuming and 9.6s, tool wear value VB maximum diameter of the drill bit after the Office of the tool face measurement. Meanwhile, for comparison of different coatings, the author has made use of conventional PVD process of the TiN coating of M2 high speed steel twist drill, twist drill in conjunction with the drilling experiments.
Such as flank wear with a 0.3mm to blunt the standard, then CNx coated drill 48 holes can be drilled is about 8 times the uncoated drill, TiN coated drill 2 times. Visible, CNx coating to improve the wear resistance of effect is very significant. TiN coated drill bit number 24. Uncoated M2 drilling bit number 6.
(2) CNx coated carbide insert turning experiment
I use K30 cemented carbide inserts as substrate, coating CNx film, turning hardened T12A Tool Steel (hardness 61HRC). Its blade with no coating K30 compared to participate in contrast there are cubic boron nitride (PCBN) Turning tool .
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