| 摘要 |
PCT No. PCT/US96/12002 Sec. 371 Date Jan. 22, 1998 Sec. 102(e) Date Jan. 22, 1998 PCT Filed Jul. 19, 1996 PCT Pub. No. WO97/04908 PCT Pub. Date Feb. 13, 1997A high speed drill bit is formed of a longitudinal body designed to rotate about a longitudinal axis. Each flute has a leading edge with a positive rake angle and a trailing edge with a neutral or negative rake angle. The bit cutting face is formed by surfaces and cutting edges that are asymmetrical with respect to each other. |
