US 12,220,747 B2
Cutting tool
Fumiyoshi Kobayashi, Itami (JP); Susumu Okuno, Itami (JP); Anongsack Paseuth, Itami (JP); and Shinya Imamura, Itami (JP)
Assigned to SUMITOMO ELECTRIC HARDMETAL CORP., Itami (JP)
Appl. No. 17/600,612
Filed by Sumitomo Electric Hardmetal Corp., Itami (JP)
PCT Filed May 18, 2020, PCT No. PCT/JP2020/019650
§ 371(c)(1), (2) Date Oct. 1, 2021,
PCT Pub. No. WO2020/250625, PCT Pub. Date Dec. 17, 2020.
Claims priority of application No. 2019-108735 (JP), filed on Jun. 11, 2019.
Prior Publication US 2022/0193787 A1, Jun. 23, 2022
Int. Cl. B23B 27/14 (2006.01); B23C 5/16 (2006.01); C23C 16/36 (2006.01); C23C 16/40 (2006.01); C23C 28/04 (2006.01)
CPC B23B 27/14 (2013.01) [B23C 5/16 (2013.01); C23C 16/36 (2013.01); C23C 16/402 (2013.01); C23C 28/042 (2013.01); C23C 28/044 (2013.01); B23B 2224/04 (2013.01); B23B 2224/32 (2013.01); B23C 2224/04 (2013.01); B23C 2224/32 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A cutting tool including a rake face and a flank face, the cutting tool comprising:
a substrate; and
a coating film disposed on the substrate, wherein
the coating film includes an Al2O3 layer,
a residual stress of the Al2O3 layer has a minimum value Rmin at only a portion of a region d1 in the rake face,
the minimum value Rmin is more than −0.27 GPa and less than or equal to −0.1 GPa,
in a case where the rake face and the flank face are connected to each other via a cutting edge face, the region d1 is a region interposed between an imaginary line D1 and an imaginary line D2, the imaginary line D1 being separated by 1 mm from an imaginary ridgeline on the rake face, the imaginary ridgeline being formed by intersection of a plane obtained by extending the rake face and a plane obtained by extending the flank face, the imaginary line D2 being separated by 3 mm from the imaginary ridgeline on the rake face, and
in a case where the rake face and the flank face are connected to each other via a ridgeline, the region d1 is a region interposed between an imaginary line D1 and an imaginary line D2, the imaginary line D1 being separated by 1 mm from the ridgeline on the rake face, the imaginary line D2 being separated by 3 mm from the ridgeline on the rake face.