| 摘要 |
A broaching cutter (1) has, sequentially from the upstream side of a cutting direction (S), a plurality of initial cutting edge tiers (2) for cutting a forming site of a tooth body (821) for a plurality of internal teeth (82), a plurality of intermediate cutting edge tiers (3) for cutting the forming site of the tooth body (821) deeper, and a plurality of final cutting edge tiers (4) for cutting a forming site for a clearance (822) located further back than the tooth body (821). A pair of distal end corners (311) of a plurality of cutting edges (31) in the intermediate cutting edge tiers (3) and a pair of distal end corners (411) of a plurality of cutting edges (41) in the final cutting edge tiers (4) are formed to have a larger chamfer shape than the chamfer shape of a pair of distal end corners (211) of a plurality of cutting edges (21) in the initial cutting edge tiers (2). |
