Radius end mill

Abstract

[Problem] To provide a radius end mill minimizing the appearance of steps and angles on the connecting points between a corner (R) cutting edge and an outer circumferential cutting edge, with good sharpening performance and little machined surface roughness. [Solution] A radius end mill (20) provided with: a tool main body (1) for rotating around a central axis (O); a bottom cutting edge (2) located on the distal end portion of the tool main body (1); an outer circumferential cutting edge (4) located on the outer circumference of the tool main body (1); a corner (R) cutting edge (3) connecting the space between the bottom cutting edge (2) and the outer circumferential cutting edge (4); a plurality of cutting edges (5) comprising a series; a rake surface (6) of the bottom cutting edge (2), the corner (R) cutting edge (3), and the outer circumferential cutting edge (4); a chip discharge groove (7) extending to the rear of the rake surface (6); and a corner gash (8) adjacent to the corner (R) cutting edge (3) of the rake surface (6). The planar corner gash (8) is provided so that part of the edge is the central portion of the corner (R) cutting edge (3), and the axial rake (alpha) on the end portion of the bottom cutting edge (2) touching the corner gash (8) of the corner (R) cutting edge (3) is between 5-20 DEG .

Description

technical field [0001] The present invention relates to a radius end mill with a corner R cutting edge. Background technique [0002] Radius end mills are widely used because they can achieve high-efficiency cutting. For example, Patent Document 1 discloses a radius end mill in which a main end gash is formed at the front end portion of the chip discharge flute intersecting the bottom cutting edge, and an end gash is formed on the main end gash surface. A sub-cut end deep face is formed across the outer region where the outer peripheral cutting edges intersect from the boundary between the bottom cutting edge and the corner R cutting edge. In addition, Patent Document 2 discloses a radius end mill in which a deep cut is provided across the corner R cutting edge from the bottom cutting edge. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: International Publication No. 2004 / 058438 Pamphlet (pamphlet) [0006] Patent Document 2: Japanese...

AI Technical Summary

Problems solved by technology

[0009] However, in the radiused end mills disclosed in Patent Documents 1 and 2, when a deep pocket is provided on the corner R cutting edge, the rake angle at this portion becomes small, and there is a problem that the blade becomes blunt.

In particular, the outer peripheral cutting edge side of the corner R cutting edge is the part that is most prone to wear. However, in the infeed machining, the cutting resistance is high, and the cutting and feeding cannot be increased, so there is a problem that high-efficiency machining cannot be realized.

In addition, the bottom cutting edge is more prone to sliding wear than the outer peripheral cutting edge, and the machined surface of the workpiece may be roughened easily.

Conversely, when the depth of the tool end is excessively reduced, the bottom cutting edge, corner R cutting edge, and peripheral cutting edge cannot be smoothly connected, and a step or corner appears at the joint of the cutting edge, so that there is stuck chip, or Problems such as chipping during cutting

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