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AssigneeSumitomo Electric Hardmetal Corp.
InventorsSatoru Kukino, Yoshihiro Kuroda, Tomohiro Fukaya, Katsumi Okamura
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In high efficiency cutting of very hard and hard-to-cut ferrous materials, compared with conventional cBN sintered body tools, the fatigue life of the machined part is improved and a longer lasting tool is provided by controlling the production of the affected layer by machining formed on the machined surface of the workpiece to be cut and by promoting residual of compression stress. The cBN sintered body related to the present invention has not less than 60% and not more than 95% of cBN components in volume, and has a thermal conductivity of 70 W/m·K or more; and the outermost surface thereof is coated with a heat resistant film comprising a compound of at least one element selected from 4a, 5a, 6a group elements and Al, and at least one element selected from C, N and O.
A cBN sintered body for high surface integrity machining, comprising not less than 60% and not more than 95% of cBN component in volume %, having a thermal conductivity of 70 W/m·K or more, and an outermost surface of the cBN sintered body being coated with a heat resistant film having a thickness of 0.5 to 12 μm and comprising a compound of at least one element selected from 4a, 5a, 6a group elements and Al, and at least one element selected from C, N and O.
Dependencies are inferred from the claim text.