Cubic boron nitride cutting tool
AssigneeSumitomo Electric Hardmetal Corp.
InventorsTsutomu Hirano, Katsumi Okamura, Naoki Watanobe
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Abstract
An object is to prolong the life of a cubic boron nitride cutting tool used for cutting a heat-resistant alloy. A cubic boron nitride cutting tool includes an edge tip made of a sintered cubic boron nitride compact having a thermal conductivity within the range of 20 to 70 W/m·K and including cubic boron nitride particles having an average particle diameter within the range of 0.5 μm to 2 μm; and a base metal that holds the edge tip at a corner portion of the base metal, wherein a cutting edge formed on the edge tip of the tool has a positive rake angle.
Claims5
A cubic boron nitride cutting tool, comprising:
- an edge tip made of a sintered cubic boron nitride compact having a thermal conductivity within the range of 20 to 70 W/m·K and including cubic boron nitride particles having an average particle diameter within the range of 0.5 μm to 2 μm;
- and
- a base metal that holds the edge tip at a corner portion of the base metal, wherein:
- a cutting edge formed on the edge tip of the tool has a positive rake angle;
- the edge tip has a rake face, a rising surface, and a top surface;
- in a cross section taken along a bisector of a corner angle of the corner portion, a first end of the rising surface is connected with the top surface and a second end of the rising surface is connected with the rake face;
- in a top view, (i) the rising surface is curved at a radius of curvature of 50 mm to 200 mm, (ii) the rake face has grinding lines having a concave curve that faces the corner portion of the tool, and (iii) the grinding lines are parallel to the rising surface.
Dependencies are inferred from the claim text.