Cutting tool and method for manufacturing optical fiber preform

Patent metadata

Field	Value
Publication number	US-2022011499-A1
Application number	US-202117483970-A
Country	US
Kind code	A1
Filing date	Sep 24, 2021
Priority date	Mar 28, 2019
Publication date	Jan 13, 2022
Grant date	—

Abstract

A cutting tool includes: a shank part; and a cutting part provided at one end of the shank part. The cutting part includes a first region provided at one end of the cutting tool, and a second region located closer to a center of the cutting tool than the first region. Abrasive grains adhere to the first region and the second region. An average grain diameter of the abrasive grains in the second region is smaller than an average grain diameter of the abrasive grains in the first region.

First claim

1 . A cutting tool comprising:
a shank part; and a cutting part provided at one end of the shank part, wherein the cutting part includes a first region provided at one end of the cutting tool and a second region located closer to a center of the cutting tool than the first region, abrasive grains adhere to the first region and the second region, and an average grain diameter of the abrasive grains in the second region is smaller than an average grain diameter of the abrasive grains in the first region.

2 . The cutting tool according to claim 1 ,
wherein the abrasive grains are diamond grains.

3 . The cutting tool according to claim 1 , wherein the average grain diameter of the abrasive grains in the first region is 100 μm or greater and the average grain diameter of the abrasive grains in the second region is less than 100 μm.

4 . The cutting tool according to claim 1 ,
wherein an outer diameter of the second region is greater than an outer diameter of the first region.

5 . The cutting tool according to claim 4 ,
wherein a difference between the outer diameter of the second region and the outer diameter of the first region is in a range of 10 μm or greater and 300 μm or less.

6 . A method for manufacturing an optical fiber preform including a core extending in a longitudinal direction, the method comprising:
preparing a jacket material by forming a hole from one end to another end of a glass body in an axial direction of the glass body by using the cutting tool according to claim 1 ; inserting a core rod into the hole; and integrating the jacket material and the core rod with each other by heating the jacket material.

Assignees

• Sumitomo Electric Industries

Inventors

• Nakanishi Tetsuya
• Nagashima Takuji

Classifications

• G02B6/02042 Primary

  Multicore optical fibres · CPC title

• B24B7/22 Primary

  for grinding inorganic material, e.g. stone, ceramics, porcelain · CPC title

• B24B5/40

  for grinding tubes internally · CPC title

• B24D7/14

  Zonally-graded wheels; Composite wheels comprising different abrasives · CPC title

• B24D5/14

  Zonally-graded wheels; Composite wheels comprising different abrasives · CPC title