Gear finishing hob

Details Gear finishing hob Gear finishing hob

1993-06-25

1994-08-16

Terrell, William E.

Cutters, for shaping

Gear cutting tool

Hob

407 23, B23F 2116

Patent

active

053381343

ABSTRACT:
A finishing gear hob whose shape is of a worm includes a working side with cutting edges K, which are in the form of a continuous equally-rising spaced cylindrical helix, and edges K are formed by the intersection of the rake faces A, i.e. the top surfaces of the worm, and the flanks B, i.e. the working sides of the worm. The number of cutting edges K equals to the thread number i of the worm, where i is a positive integer. The normal pitch P.sub.n of the working side of the worm is equal to the normal base pitch t.sub.b of the machined gear .pi.m.sub.n COS.alpha..sub.n where m.sub.n is the normal module of the machined gear; and .alpha..sub.n is the normal pressure angle at the reference circle of the machined gear. The lead angle .lambda. of the helix cutting edge is calculated by the formula Sin.lambda.=(im.sub.n COS.alpha..sub.n)/2R where R is the radius of cylindrical helix cutting edge K, and the helix lead P of the helix cutting edge P=(i.pi.m.sub.n COS.alpha..sub.n)/COS.lambda.. This finishing hob is used for high finishing, good for cutting, gives long life, and its cost is low.

REFERENCES:
patent: 1548931 (1925-08-01), Candee
patent: 1772634 (1930-08-01), Olson
patent: 1787590 (1931-01-01), Olson
patent: 1792548 (1931-02-01), Olson
patent: 1847054 (1932-02-01), Breuer
patent: 2511964 (1950-06-01), Boor
patent: 3022569 (1962-02-01), Wildhaber

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