US 12,109,638 B2
Cutting insert and gear cutter
Atsushi Ogawa, Iwaki (JP); and Akimichi Suzuki, Iwaki (JP)
Assigned to TUNGALOY CORPORATION, Fukushima (JP)
Filed by TUNGALOY CORPORATION, Fukushima (JP)
Filed on Sep. 2, 2021, as Appl. No. 17/465,227.
Claims priority of application No. 2020-188022 (JP), filed on Nov. 11, 2020.
Prior Publication US 2022/0143721 A1, May 12, 2022
Int. Cl. B23F 21/12 (2006.01)
CPC B23F 21/128 (2013.01) 19 Claims
OG exemplary drawing
 
1. A cutting insert which is a replaceable cutting insert fixed to a tool body and constituting a gear cutter, the cutting insert comprising:
a first face which is a rake face, a second face on a side opposite to the first face, a peripheral side face connecting the first face and the second face, and a mounting hole provided in the peripheral side face, wherein
a cutting blade is formed on a ridge line where the first face and the peripheral side face cross each other,
the cutting blade includes a corner part that includes one end of the cutting blade and that is capable of machining a tooth bottom of a gear, and a main part extending to the corner part from the other end of the cutting blade on the side opposite to the one end,
the peripheral side face includes an outer side face facing the cutting blade and an inner side face on a side opposite to the outer side face and in contact with the tool body, the outer side face further including a first flank facing the main part,
the mounting hole penetrates the first flank and the inner side face so that a center axis of the mounting hole crosses the inner side face perpendicularly, and
the cutting insert is formed having a wedge shape such that a thickness between the first flank and the inner side face continuously decreases along an entirety of the main part towards the other end.