| 摘要 |
<p>An end mill (10) for machining titanium includes a cutting portion (14) having blunt teeth alternated with flutes (22). Each flute (22) includes, in order from the cutting edge (30), a rake surface (28), a concavely shaped bending portion (38), a convexly shaped ejecting portion (36) and a tooth relief edge (32). The convexly shaped ejecting portion (36) has an ejection height E, which is measurable between an apex of the ejecting portion (36) to an imaginary straight line extending from a nadir of the adjacent bending portion (36) of the flute (22) to the adjacent tooth relief edge (32). In a plane perpendicular to a rotation axis (AR) of the end mill (10), the ejection height E and a cutting portion diameter DE, fulfill the condition 0.01 ODE < E < 0.031 DE.</p> |
