| 摘要 |
PURPOSE:To improve cutting efficiency and make regrinding easier by alternately placing the first cutting edges and the second cutting edges as cutting edges. CONSTITUTION:As for cutting edges, the first cutting edges 23 and the second cutting edges 24 are alternately placed. Nearly the same clearance angles and cutting-edge angles are formed on the flanks of both the first cutting edges 23 and the second cutting edges 24. Several cutting edges are provided on the first cutting edge 23 by forming its front face into steps. With the direction of each flank 37, 38 of the cutting edges 23, 24 being made the same, the regrinding of the cutting edges is extremely easier, while the cutting efficiency is improved due to the construction as mentioned above. |
