Cutting insert and gear cutter

Patent metadata

Field	Value
Publication number	US-2022143721-A1
Application number	US-202117465227-A
Country	US
Kind code	A1
Filing date	Sep 2, 2021
Priority date	Nov 11, 2020
Publication date	May 12, 2022
Grant date	—

Abstract

A cutting insert which is excellent both in manufacturing performances and dimensional precision and forms a pair with a tool body and a gear cutter including the cutting insert are provided. A cutting insert has a first face which is a rake face, a second face, a peripheral side face, and a mounting hole. On a ridge line where the first face and the peripheral side face cross each other, a cutting blade is formed. The cutting blade includes a corner part capable of machining a tooth bottom of a gear, and a main part extending to the corner part. The peripheral side face includes an inner side face in contact with a tool body and a first flank facing the main part. The mounting hole penetrates the first flank and the inner side face so that a center axis crosses the inner side face perpendicularly. The cutting insert is formed having a wedge shape such that thickness of the first flank and the inner side face becomes smaller as it goes from one end to the other end.

First claim

What is claimed is:

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 thickness of the first flank and the inner side face becomes smaller towards the one end to the other end.

2 . The cutting insert according to claim 1 , wherein
an angle formed by an extending direction of the main part and a virtual face formed by extending the inner side face is 1 degree or more and 45 degrees or less.

3 . The cutting insert according to claim 1 , wherein
the mounting hole is superimposed on the virtual face bisecting a height of the cutting blade in a radial direction of the tool body.

4 . The cutting insert according to claim 2 , wherein
the mounting hole is superimposed on the virtual face bisecting a height of the cutting blade in a radial direction of the tool body.

5 . The cutting insert according to claim 1 , wherein
the first face and the second face are formed mirror symmetrically when viewed from the mounting hole, and on a ridge line where the second face and the peripheral side face cross each other, a second cutting blade is formed.

6 . The cutting insert according to claim 2 , wherein
the first face and the second face are formed mirror symmetrically when viewed from the mounting hole, and on a ridge line where the second face and the peripheral side face cross each other, a second cutting blade is formed.

7 . The cutting insert according to claim 3 , wherein
the first face and the second face are formed mirror symmetrically when viewed from the mounting hole, and on a ridge line where the second face and the peripheral side face cross each other, a second cutting blade is formed.

8 . The cutting insert according to claim 4 , wherein
the first face and the second face are formed mirror symmetrically when viewed from the mounting hole, and on a ridge line where the second face and the peripheral side face cross each other, a second cutting blade is formed.

9 . A gear cutter which can create a tooth profile of a gear, the gear cutter comprising:
a replaceable cutting insert; and a tool body in which an insert mounting seat to which the cutting insert is fixed is provided, wherein the insert mounting seat has a seating face in which a screw hole is formed perpendicularly, and the insert mounting seat is formed such that a step from an outer edge of the insert mounting seat to the seating face becomes deeper going away from a rotation axis of the tool body.

Assignees

• Tungaloy Corp

Inventors

• Ogawa Atsushi
• Suzuki Akimichi

Classifications

• B23F21/166

  in exchangeable arrangement · CPC title

• B23F21/16 Primary

  Hobs · CPC title

• B23C2200/367

  Mounted tangentially, i.e. where the rake face is not the face with largest area · CPC title

• B23C5/202

  Plate-like cutting inserts with special form (special form related to securing of the insert B23C5/22) · CPC title

• B23C2200/203

  Curved cutting edges · CPC title