Importance

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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.

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First Claim