Title:
ドリル及び穿孔の形成方法
Document Type and Number:
Japanese Patent JP6393620
Kind Code:
B2
Abstract:
A drill capable of efficiently performing high-quality drilling machining on a material which is hard to be cut such as CFRP and the like is provided. The drill includes a drill body 4 having a shank portion 2 at a rear side of the drill main body and a cutting portion 3 at a front side of the drill main body, a first land A to a fourth land D at the cutting portion 3, a first cutting portion groove 5a to a fourth cutting portion groove 5d provided between the lands of the first land A to the fourth land D, a pilot blade 6 formed at the tip of the cutting portion 3, a diameter-enlarging spiral thread portion 9 having a group of threads of diameter-enlarging spiral threads AK1-DK4 continuously following the pilot blade 6, a finished spiral thread portion 12 having a group of threads of finishing spiral threads AF1-DF5, which have the same height, and continuously following the diameter-enlarging spiral thread portion 9, a diameter-enlarging spiral blade portion 18 having a group of blades of the diameter-enlarging spiral threads AK1-DK4, and a finishing spiral blade portion 19 having a group of blade of the finishing spiral threads AF1-DF5. A cutting feed rate is set to an amount so that a spiral convex part will not be formed on the wall surface of a cutting hole formed in a material to be machined, and therefore the wall surface will be finished as a flat wall.
More Like This:
| WO/2014/121117 | AUGER BIT WITH REPLACEABLE CUTTING BIT |
Inventors:
Teruo Sawabe
Koji Saito
Masaru Kato
Koji Saito
Masaru Kato
Application Number:
JP2014545750A
Publication Date:
September 19, 2018
Filing Date:
November 07, 2013
Export Citation:
Assignee:
Miyagi Tanoi Co., Ltd.
Akita
Akita
International Classes:
B23B51/08; B23B35/00; B23B47/34; B23B51/00; B23B51/06; B23Q11/00; B23Q11/10
Domestic Patent References:
| JP2007268657A |
Foreign References:
| WO2010095249A1 | ||||
| US4127355 | ||||
| US7246976 | ||||
| US7357606 |
Attorney, Agent or Firm:
Ryo Matsushita