Title:
ENDMILL
Document Type and Number:
WIPO Patent Application WO/2020/166421
Kind Code:
A1
Abstract:
This endmill is provided with: an endmill body which is shaft-shaped and is rotatable about an axial line and which is provided with, at a leading end thereof, a plurality of gashes which extend radially and are arranged along the circumferential direction; and a plurality of cutting edges which are provided to the leading-end side ridges of wall surfaces, of the gashes, directed in the endmill rotational direction. The rotation trajectory of the cutting edges is a circular-arc shape projecting toward the leading-end side, in which the circular-arc center is located on the axial line in a side view. The curvature radius of the rotation trajectory of the cutting edges is larger than 1/2 of the outer diameter of the endmill body. The tips of the cutting edges are bent so as to project toward the rotational direction, in a planar view. The size of the maximum projection of the tips of the cutting edges toward the rotational direction with respect to a virtual line connecting both radial ends of the tips is 3-4% of the outer diameter of the endmill body. The cutting edges include master and slave edges.
Inventors:
BABA MAKOTO (JP)
SAI TAKAFUMI (JP)
TOKUYAMA AKIRA (JP)
SAI TAKAFUMI (JP)
TOKUYAMA AKIRA (JP)
Application Number:
PCT/JP2020/004028
Publication Date:
August 20, 2020
Filing Date:
February 04, 2020
Export Citation:
Assignee:
MOLDINO TOOL ENGINEERING LTD (JP)
International Classes:
B23C5/10
Foreign References:
| CN109262038A | 2019-01-25 | |||
| JP2011056608A | 2011-03-24 | |||
| JP2011183532A | 2011-09-22 | |||
| JP2011189463A | 2011-09-29 | |||
| JP2010520064A | 2010-06-10 | |||
| JPH11165212A | 1999-06-22 | |||
| JP2019024409A | 2019-02-21 | |||
| JPH05337718A | 1993-12-21 |
Other References:
See also references of EP 3925721A4
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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