| 摘要 |
PCT No. PCT/SU88/00204 Sec. 371 Date Jun. 12, 1990 Sec. 102(e) Date Jun. 12, 1990 PCT Filed Oct. 21, 1988 PCT Pub. No. WO90/04473 PCT Pub. Date May 3, 1990.The invention relates to the cutting tools for machining of holes. The claimed drill has helical chip flutes wherein the leading (5) and flank (8) surfaces and their mating surface (10) represent, each, a part of the circular helical surface. |
