US 12,280,439 B2
Cutting tool body, cutting insert, and cutting tool
Kouki Matsubara, Itami (JP); Tomoyuki Fukuyama, Itami (JP); Shota Takemura, Itami (JP); Shota Tsujimoto, Itami (JP); and Naoki Matsuda, Itami (JP)
Assigned to SUMITOMO ELECTRIC HARDMETAL CORP., Itami (JP)
Appl. No. 17/437,425
Filed by SUMITOMO ELECTRIC HARDMETAL CORP., Itami (JP)
PCT Filed Mar. 25, 2020, PCT No. PCT/JP2020/013250
§ 371(c)(1), (2) Date Sep. 9, 2021,
PCT Pub. No. WO2020/196597, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-060277 (JP), filed on Mar. 27, 2019.
Prior Publication US 2022/0152713 A1, May 19, 2022
Int. Cl. B23C 5/10 (2006.01); B23C 5/20 (2006.01)
CPC B23C 5/109 (2013.01) [B23C 5/20 (2013.01); B23C 2210/168 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A cutting tool body comprising:
a front end surface;
a rear end surface located opposite to the front end surface;
an outer circumferential surface contiguous to the front end surface;
a first seating surface contiguous to each of the front end surface and the outer circumferential surface; and
a second seating surface contiguous to the front end surface and located closer to a central axis than the outer circumferential surface, wherein
the cutting tool body is provided with a recess contiguous to each of the first seating surface, the second seating surface, and the front end surface, and
when the front end surface is viewed in a direction from the front end surface toward the rear end surface,
a length of the recess in a direction perpendicular to a straight line parallel to the central axis and extending along the first seating surface is equal to or longer than three times as long as a length of the recess in a direction perpendicular to the first seating surface and passing through a contact point at which the second seating surface, the recess, and the front end surface contact each other.