To provide an end mill having a gash securing good chip discharge performance and inhibiting stress concentration without deteriorating the stiffness of the edge of an end mill body.
In a cross-section perpendicular to an intersecting ridge line between an end cutting edge rake face 6A and a gash bottom face 6B of the gash 6, the gash bottom face 6B and the end cutting edge rake face 6A, and the gash bottom face 6B and a gash wall face 6C are respectively connected together by first and second connecting faces 8A, 8B having a form which is a concave curve or a generally concave polygonal line. The radius of curvature R1 of the concave curve or the radius of a circle inscribed in the generally concave polygonal line of the first connecting face 8A is larger than the radius of curvature r1 of the concave curve or the radius of a circle inscribed in the generally concave polygonal line of the second connecting face 8B.
| JP2005125433A | 2005-05-19 | |||
| JP2010264592A | 2010-11-25 |
| WO2009025197A1 | 2009-02-26 | |||
| US7588396B2 | 2009-09-15 |
Tadashi Takahashi
Yasuhiko Murayama
Noriko Yanai