US 2025/0033127 A1Published application

End mill

AssigneeOsg Corporation

InventorTasuku ITOH

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Abstract

End mill is provided with outer periphery cutting edges and end cutting edges along spiral flutes. Spiral flutes include first and second flutes. Flute bottom of first flute is with linear portion, R-shaped portion, and gradient portion. The linear portion extends in parallel to axis line O and in straight-line shape, from tool distal end toward rear end side to position separated from the tool distal end by length corresponding to tool outer diameter. The gradient portion is provided to the rear end side, and is inclined straightly toward outer side in radial direction toward the rear end side. The R-shaped portion connects rear end of the linear portion and front end of the gradient portion, and is curved in circular arc shape toward the outer side in the radial direction. Rake angles of the outer periphery and end cutting edges are constant over entire periphery.

Claims6

Dependent claims

An end mill provided with cutting edges along a plurality of spiral flutes spiraling around an axis line, wherein

a flute bottom of the spiral flute includes
a linear portion extending parallel to the axis line and in a straight-line shape, from a tool distal end toward a rear end side, to a position separated from the tool distal end by a length corresponding to a tool outer diameter,
a gradient portion provided further to the rear end side than the linear portion, and being inclined, in a straight-line shape, toward an outer side in a radial direction the further toward the rear end side from the linear portion side, and
an R-shaped portion connecting a rear end of the linear portion and a front end of the gradient portion, and being curved, in a circular arc shape toward the outer side in the radial direction the further toward the gradient portion side from the linear portion side, and
a rake angle of the cutting edge is constant over an entire periphery of the cutting edge.

2 more elements

Dependencies are inferred from the claim text.