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US 11,440,108 B2Granted
Rotary cutting tool
AssigneeSumitomo Electric Hardmetal Corp.
InventorsNozomi Tsukihara, Yutaka Kobayashi, Minoru Yoshida
Life of this patent
Estimating the term…
Abstract
A rotary cutting tool includes a main body and a shank. The main body has a tip end. The shank is continuous with the main body on the side opposite to the tip end. The main body is provided with a first cutting edge having a positive twist angle, and a second cutting edge having a negative twist angle and separated from the first cutting edge. Each of the first cutting edge and the second cutting edge extends continuously from the tip end to the shank.
Claims8
A rotary cutting tool comprising:
- a main body having a tip end;
- and
- a shank continuous with the main body on a side opposite to the tip end,
- the main body being provided with
- a first cutting edge having a positive twist angle, and
- a second cutting edge having a negative twist angle and separated from the first cutting edge,
- each of the first cutting edge and the second cutting edge extending continuously from the tip end to the shank, wherein
- the main body includes a base material, and a coating covering the base material,
- the coating is a polycrystalline diamond,
- the polycrystalline diamond includes a superficial layer and a deep layer, the deep layer is located between the superficial layer and the base material,
- a mean grain diameter of the superficial layer is smaller than a mean grain diameter of the deep layer,
- the coating includes at least one element selected from the group consisting of iron, molybdenum, and tungsten, and
- in a portion of the coating that is in contact with the base material, a total content of the at least one element is not less than 1.0×1015 atoms/cm3 and not more than 1.0×1018 atoms/cm3.
10 more elements
Dependencies are inferred from the claim text.