Title:
Multi-blade ball end mill
Document Type and Number:
Japanese Patent JP6344391
Kind Code:
B2
Abstract:
A multi-flute ball end mill comprising a shank portion, a cutting edge portion having a ball-shaped tip portion, and 3 or more cutting edges formed in the cutting edge portion; each cutting edge being constituted by a peripheral cutting edge having a twist angle · of 35-45°, and a ball-end cutting edge having a twist angle µ at the outermost peripheral point, the twist angle · and the twist angle µ meeting the relation of · - µ ‰¤ 7°, such that the ball-end cutting edge is smoothly connected to the peripheral cutting edge; the ball-end cutting edge having a radial rake angle of -37° to -11°; the peripheral cutting edge having a radial rake angle of 2-8°; and a center-lowered, inclined cutting edge integrally extending from a tip end of each ball-end cutting edge to a rotation center point, in a tip end portion of the ball portion near the rotation center point.
Inventors:
Shinjiro Sakai
Application Number:
JP2015530936A
Publication Date:
June 20, 2018
Filing Date:
August 06, 2014
Export Citation:
Assignee:
Mitsubishi Hitachi Tool Co., Ltd.
International Classes:
B23C5/10
Domestic Patent References:
| JP2004181563A | ||||
| JP7020211U | ||||
| JP6218611A | ||||
| JP2002187011A | ||||
| JP2005224898A | ||||
| JP2010214500A | ||||
| JP2008049404A |
Attorney, Agent or Firm:
Takaishi Tachibana
Kenji Takaishi
Kenji Takaishi