公开(公告)号：EP3378587A1

公开(公告)日：2018-09-26

申请号：EP18156644.9

申请日：2018-02-14

申请人： Tungaloy Corporation

发明人： Sasaki, Yasutake ,  Miyazawa, Syunsuke ,  Fukushima, Yuichiro

IPC分类号： B23B27/14

CPC分类号： B23B27/148 ,  B23B27/145 ,  B23B27/20 ,  B23B2200/0428 ,  B23B2200/0433 ,  B23B2200/0452 ,  B23B2200/3618 ,  B23B2222/28 ,  B23B2224/04 ,  B23B2224/08 ,  B23B2224/12 ,  B23B2224/24 ,  B23B2224/28 ,  B23B2224/32 ,  B23B2224/36 ,  B23B2226/125 ,  C04B35/5831 ,  C04B35/6303 ,  C04B2235/3217 ,  C04B2235/3244 ,  C04B2235/3813 ,  C04B2235/3821 ,  C04B2235/3843 ,  C04B2235/3847 ,  C04B2235/3856 ,  C04B2235/3873 ,  C04B2235/3886 ,  C04B2235/762

摘要： A cutting edge tip of a cubic boron nitride sintered body has improved joint strength to a substrate of a cemented carbide. A cutting edge tip of a cubic boron nitride sintered body has improved crater wear resistance. A tool (10) of the present invention includes a substrate (12) of a cemented carbide and a cutting edge tip (14) of a cubic boron nitride sintered body joined to the substrate (12). The cutting edge tip (14) has a thickness covering an upper surface (12a) to a lower surface (12b) of the substrate (12). The cubic boron nitride sintered body contains 50 volume% or more and 95 volume% or less of cubic boron nitride and 5 volume% or more and 50 volume% or less of a binder phase. The cubic boron nitride has an average grain size of 1.0 µm or more and 6.0 µm or less.