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Title:
ROTARY TOOL
Document Type and Number:
Japanese Patent JP2020121372
Kind Code:
A
Abstract:
To provide a rotary tool which can enhance chip discharge performance while securing the stiffness of the tool.SOLUTION: A rotary tool 10 extending along a center axis O, and rotated in a tool rotation direction T comprises: a blade part 1 having a cutting blade 11; a shank part arranged at a rear end side in an axial direction rather than the blade part 1, and having an outside diameter larger than an outside diameter of the blade part 1; an outside diameter transition part 3 arranged between the blade part 1 and the shank part in the axial direction, and enlarged in an outside diameter as progressing toward the rear end side in the axial direction; and a chip discharge groove 4 formed at least at the blade part 1 and the outside diameter transition part 3, and extending in the axial direction. The cutting blade 11 is formed at only the blade part 1 out of the blade part 1, the outside diameter transition part 3 and the shank part, a minimum value of a core thickness WT2 of the outside diameter transition part 3 is smaller than a maximum value of a core thickness WT1 of the blade part 1, the chip discharge groove 4 has a blade groove part 4a located at the blade part 1, and a transition groove part 4b continuing to the blade groove part 4a, and located at the outside diameter transition part 3. A width of the transition groove part 4b in a peripheral direction is wider than a width of the blade groove part 4a in the peripheral direction.SELECTED DRAWING: Figure 6

Inventors:
SATO AKIRA
Application Number:
JP2019014678A
Publication Date:
August 13, 2020
Filing Date:
January 30, 2019
Export Citation:
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Assignee:
MITSUBISHI MATERIALS CORP
International Classes:
B23B51/00; B23C5/10; B23D77/00
Domestic Patent References:
JPH10244412A1998-09-14
JPH02100807A1990-04-12
JP2006346832A2006-12-28
JPH03142118A1991-06-17
Attorney, Agent or Firm:
Yasushi Matsunuma
Mitsuo Teramoto
Fumihiro Hosokawa
Kazunori Onami