Title:
BALL-END MILL
Document Type and Number:
Japanese Patent JP2022016103
Kind Code:
A
Abstract:
To prevent strength of a bottom blade from deteriorating while suppressing increase of cutting resistance by securing excellent performance of exhausting chips.SOLUTION: First gashes 7 are formed at a tip part of a chip exhaust groove 5 formed at an outer periphery of a tip part of an end mill main body 1 that is rotated in an end mill-rotation direction T around an axial line O. Bottom blades 8 whose rotation trajectories around the axis line O are semi-sphere shapes are formed at ridge parts at the outer periphery sides of tips of first wall surfaces 7a pointing to the end mill-rotation direction T of the first gashes 7. The first gashes 7 are provided with groove bottom parts 7c. Second gashes 9 are formed at least on the first wall surface 7a with an interval from the bottom blades 8. A minimum curvature radius on a cross section, orthogonal to the axis line O, of the second gash 9 is larger than a minimum curvature radius on a cross section, orthogonal to the axis line O, of the groove bottom part 7c of the first gash 7.SELECTED DRAWING: Figure 1
Inventors:
MORI TAKASHI
SAKAGUCHI KOTARO
SAKAGUCHI KOTARO
Application Number:
JP2020119394A
Publication Date:
January 21, 2022
Filing Date:
July 10, 2020
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP
International Classes:
B23C5/10
Attorney, Agent or Firm:
Yasushi Matsunuma
Mitsuo Teramoto
Fumihiro Hosokawa
Kazunori Onami
Mitsuo Teramoto
Fumihiro Hosokawa
Kazunori Onami
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