3-blade drill
作者： Kazuteru Takai , Kazutoyo Itoh
DOI:
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摘要: Each cutting blade (12) has an outer peripheral side portion (12a) shaped like a convex curve and inner (12b) concave curve. On the cross section perpendicular to axis, first (CL1) corresponding crosses (CL2) at point (A). Therefore, range of can be reduced enlarged side, concavity amount (LF) increased. As result, generated chips are curled appropriately become easy break in chip discharge groove (18). Since have relatively short curl shape free needle-shaped bumps, discharged smoothly so that performance improved. For 3-blade drill (10) with (18) having small width cross-sectional area, jamming caused by restrained, service life tool further
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