| 摘要 |
A rotary cutting tool with a longitudinal axis includes a shank portion, a cutting portion, and a plurality of chip-breaking features. The cutting portion includes a plurality of blades and a plurality of flutes. The blades and flutes extend substantially along the length of the cutting portion and have unequally-indexed spacing. The flutes have a tapered depth along the longitudinal axis. Each blade includes a leading face, a trailing face, and a land surface that extends between the leading face and the trailing face. A plurality of chip-breaking features having a multi-radius profile are disposed in the land surfaces of the blades and are distributed in an offset chip breaker pattern among the blades such that each chip-breaking feature on one blade is not directly behind the chip-breaking features on immediately adjacent blades. The chip-breaking features on each blade are equidistant from each other.
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