Title:
MULTI-BLADE BALL END MILL
Document Type and Number:
WIPO Patent Application WO/2015/020118
Kind Code:
A1
Abstract:
Provided is a multi-blade ball end mill comprising a shank, a cutting blade section having a ball on the tip thereof, and at least three cutting blades formed in the cutting blade section. Each cutting blade comprises a peripheral blade having an angle of torsion η of 35 to 45°, and a ball blade in which the angle of torsion μ at the outermost peripheral point with respect to the angle of torsion η satisfies the relationship η-μ≤7° so that the ball blade is smoothly connected with the peripheral blade. The radial rake angle of the ball blade is -37 to -11°, and the radial rake angle of the peripheral blade is 2 to 8°. A concave sloped blade is integrally formed, near the rotational center point of the ball tip, from the tip of each ball blade to the rotational center point.
Inventors:
SAKAI SHINJIROH (JP)
Application Number:
PCT/JP2014/070796
Publication Date:
February 12, 2015
Filing Date:
August 06, 2014
Export Citation:
Assignee:
HITACHI TOOL ENG (JP)
International Classes:
B23C5/10
Foreign References:
| JP2010105093A | 2010-05-13 | |||
| JPH0720211U | 1995-04-11 | |||
| JPH06218611A | 1994-08-09 | |||
| JP2002187011A | 2002-07-02 | |||
| JP2005224898A | 2005-08-25 | |||
| JP2010214500A | 2010-09-30 | |||
| JP2008049404A | 2008-03-06 | |||
| JP2004181563A | 2004-07-02 | |||
| JP2002187011A | 2002-07-02 | |||
| JP2009056559A | 2009-03-19 | |||
| JPH09267211A | 1997-10-14 | |||
| JP2010105093A | 2010-05-13 | |||
| JP2006015419A | 2006-01-19 |
Other References:
See also references of EP 3031559A4
Attorney, Agent or Firm:
TAKAISHI Kitsuma (JP)
Kitsuma Takaishi (JP)
Kitsuma Takaishi (JP)
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