| 摘要 |
1,072,208. Gear-cutting, GLEASON WORKS April 13, 1966 [June 1, 1965], No. 16193/66. Heading B3K. A method of finish-cutting tooth slots, which slots are of tapering width in a non-generated spiral bevel or hypoid gear having pre-cut sides which are surfaces of revolution about a first axis (12), Fig. 1 (not shown), comprises cutting one side of each slot as a surface of revolution about a second axis (12A) so as to taper the slot in width (cut 22) and then cutting the other side of the slot as a surface of revolution about the first axis 12 (cut 19). In the method, the axis of the cutter, Fig. 4 (not shown), remains stationary and the gear is indexed for the second cut. The resulting tooth space base surfaces are grooved as illustrated at (23), (24) in Fig. 3 (not shown) and the pressure angles of the teeth correspond to the cutter blade angles. The cut (22) is made by blades (26) to (37) and the cut 19 by blades (38) to (40). Blades 37 and 40 cut when no other blades are in the tooth space. The work is indexed in the gap 37-38. Tooth thickness may be varied by varying the indexing movement of the work. The blades may be integral, inserted or segmental. The blade (38) may serve only to skim the rough-cut surface. Cutting may take place from the wide to the narrow end of a tooth space and the cut (19) may then precede the cut (22), with the difference that the wedge-shaped cut (22) is taken from the convex side of a slot. |
