| 摘要 |
The pair of shoulders (14,16) forms the cutting edges (18) that are placed on the leading edges of the blade (8) upon its rotation and are formed by beveling the shoulders to create an acute angle between the shoulder and the plane at the face of the blade. A tip (26) extends between the shoulders where its converging sides (28,30) meet at a certain point (32). The flutes (50) covered with a non-stick coating define a surface that has a smooth profile to facilitate the removal of chips from the bore. |
