Hard sintered compact for tools
AssigneeSumitomo Electric Industries, Ltd.
InventorsTetsuo Nakai, Mitsuhiro Goto
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Abstract
In this invention, a cutting tool comprises two layers of hard sintered compact of cBN. The first sintered compact layer comprises about 75-98% by volume of cBN and a first binder material. The first binder material comprises from about 1 to out 40% by weight of Al. The second sintered compact layer comprises from about 40 to about 65% by volume of cBN and a second binder material. The second binder material comprises about 2 to about 30% by weight of Al. The first sintered compact layer is bonded to the second sintered compact layer. This composite material is bonded directly or indirectly to a tool holder to form a cutting tool. The first sintered compact layer constitutes a rake face of the cutting tool.
Claims7
A CBN sintered compact for a cutting tool, comprising:
- (a) a first sintered compact layer comprising from about 75 to about 98% by volume of CBN, and a first binder material comprising from about 1 to about 40% by weight Al admixed with at least one compound containing Ti;
- selected from the group consisting of (Ti,M) C, (Ti,M)N, (Ti,M)(CN), an admixture thereof and a solid solution compound thereof, where M represents a transition metal element or elements belonging to any one of groups IVa, Va and VIa of the periodic table excluding Ti;
- wherein said first sintered compact layer has a thickness of from about 0.04 to about 0.2 mm;
- (b) a second sintered compact layer comprising from about 40% to 65% by volume of CBN, and a second binder material containing from about 2 to about 30% by weight Al;
- (c) said first sintered compact layer bonded to said second sintered compact layer;
- and
- (d) wherein said first sintered compact layer comprises a rake face of said cutting tool.
Dependencies are inferred from the claim text.