End mill inspection device

Patent metadata

Field	Value
Publication number	US-11701746-B2
Application number	US-201917290447-A
Country	US
Kind code	B2
Filing date	Dec 24, 2019
Priority date	Feb 27, 2019
Publication date	Jul 18, 2023
Grant date	Jul 18, 2023

Abstract

An end mill inspection device, which inspects an end mill having a blade part formed in a curved convex shape or an arc shape, includes: an imaging data acquisition unit that acquires imaging data obtained by capturing an image of a blade part of the end mill by an imaging unit; a contour extraction unit that extracts the contour of the blade part on the basis of the imaging data acquired by the imaging data acquisition unit; and a curvature radius calculation unit that calculates a curvature radius of the contour on the basis of the contour of the blade part extracted by the contour extraction unit.

First claim

The invention claimed is:

1. An end mill inspection device that inspects an end mill including a cutting edge formed in a curved convex shape and in an arc shape, the device comprising:
a first acquisition unit that acquires imaging data of the cutting edge of the end mill, which is captured by an imaging unit;
a contour extraction unit that extracts a contour of the cutting edge based on the imaging data acquired by the first acquisition unit; and
a curvature radius calculation unit that calculates a curvature radius of the contour based on the contour of the cutting edge extracted by the contour extraction unit.

2. The end mill inspection device according to claim 1 , further comprising:
a second acquisition unit that acquires reference data regarding a reference shape of the end mill; and
a determination unit that determines whether or not there is a change in shape of the cutting edge, based on a difference between a value of a reference curvature radius of the reference data acquired by the second acquisition unit and a value of the curvature radius calculated by the curvature radius calculation unit, and a predetermined threshold value.

3. The end mill inspection device according to claim 2 ,
wherein a reference contour based on the reference data acquired by the second acquisition unit and the contour extracted by the contour extraction unit are compared with each other by fitting to determine the change in shape of the cutting edge.

4. The end mill inspection device according to claim 3 ,
wherein the determination unit determines the change in shape of the cutting edge based on an area between the reference contour and the extracted contour or a distance between the reference contour and the extracted contour.

5. The end mill inspection device according to claim 1 ,
wherein the cutting edge of the end mill includes a bottom edge or an outer peripheral edge formed in a curved convex shape and in an arc shape, and a radial edge provided at a corner and formed in an arc shape.

6. The end mill inspection device according to claim 5 ,
wherein the bottom edge has a region in which a cutting portion is not formed on an axis of the end mill, and
in the region of the bottom edge, a center edge is further provided, the center edge being formed in an arc shape having a smaller radius than a radius of an arc portion of the bottom edge.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Eto Jun
• Unno Hirokazu

Classifications

• B23C2210/64

  End milling cutters having a groove in the end cutting face, the groove not being present so as to provide a cutting edge · CPC title

• B23Q17/20 Primary

  for indicating or measuring workpiece characteristics, e.g. contour, dimension, hardness · CPC title

• B23C5/10

  Shank-type cutters, i.e. with an integral shaft · CPC title

• B23Q17/24

  using optics {or electromagnetic waves} · CPC title

• G01B11/255

  for measuring radius of curvature {(measuring diameter G01B11/08)} · CPC title