Drill bit insert and drill bit
AssigneeMitsubishi Materials Corporation
InventorsWardoyo Akhmadi Eko, Toshihiko Matsuo, Chihiro Sakurazawa
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Abstract
A drill bit insert attached to a tip portion of a drill bit to perform drilling, includes: an insert body (1) that includes: a rear end portion buried in a bit body of the drill bit; and a tip portion protruding from a surface of the drill bit and tapered toward a tip side of the insert body, in which a surface of at least the tip portion of the insert body (1) made of polycrystalline cubic boron nitride compact (4) sintered using a catalytic metal containing Al and at least one selected from the group consisting of Co, Ni, Mn, and Fe and containing 70 vol % to 95 vol % of cubic boron nitride.
Claims8
A drill bit insert attached to a tip portion of a drill bit to perform drilling, the drill bit insert comprising:
- an insert body that has:
- a rear end portion buried in a bit body of the drill bit;
- and
- a tip portion protruding from a surface of the drill bit and tapered toward a tip side of the insert body, wherein
- a surface of at least the tip portion of the insert body is made of polycrystalline cubic boron nitride compact sintered using a catalytic metal containing Al and at least one selected from the group consisting of Co, Ni, Mn, and Fe and containing 70 vol % to 95 vol % of cubic boron nitride, and
- Hv hardness of the polycrystalline cubic boron nitride compact is 3.5 GPa to 4.4 GPa.
Dependencies are inferred from the claim text.