| 摘要 |
PURPOSE:To smooth the surface of the tooth bottom by removing the part short of cut of the tooth bottom part by applying the cutting only for the tooth bottom part of a gear to be cut and executing the finishing work by a cutting tool having a small thickness of the tooth and having a clearance angle at the tip. CONSTITUTION:A cutting edge 11 is formed into an edge along the direction of the tooth trace at the tip, and the thickness of tooth is formed thinner for the tooth shape 13 conjugate to a gear 18 to be cut as an object, and the edge of the tip is allowed to coincide with a tip circle 14, and the other tip edge 15 is retreated to the inner peripheral side from the tip circle 14, and a tooth crest 16 is formed to a clearance angle. In cutting work, the teeth 18 of the gear 17 for which gear cutting is previously executed and the tooth 12 of a cutting tool 10 are meshed and revolved, and the between-shaft distance in which the pitch circles of the teeth 12 and 18 contact is maintained. The cutting edge 11 cuts into the part short of cut through trochoid movement and cuts said part, and the tooth bottom surface is made smooth, and stress concentration is avoided. |
