초록 ▼

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 wor

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 Pn of the working side of the worm is equal to the normal base pitch tb of the machined gear pnCOSan where mn is the normal module of the machined gear; and an is the normal pressure angle at the reference circle of the machined gear. The lead angle llnCOSan)/2R where R is the radius of cylindrical helix cutting edge K, and the helix lead P of the helix cutting edge P=(ipnCOSan)/COSl

대표청구항 ▼

A finishing gear hob, whose shape is worm-like, wherein: on the working side of the mentioned finishing hob there are cutting edges K, in the form of a continuous equally-rising spaced cylindrical helix, and wherein edges K are formed by the intersection of the rake faces A, forming the top surfaces

A finishing gear hob, whose shape is worm-like, wherein: on the working side of the mentioned finishing hob there are cutting edges K, in the form of a continuous equally-rising spaced cylindrical helix, and wherein edges K are formed by the intersection of the rake faces A, forming the top surfaces of the worm, and flanks B, forming the working sides of the worm; the number of cutting edges K being equal to the thread number i of the worm, where i is a positive integer, the normal pitch Pn of the working side of the worm being equal to the normal base pitch tb of the machined gear pncosan, where mn is the normal module of the machined gear; and an is the normal pressure angle at a reference circle of the machined gear, and wherein the lead angle llncosan)/2R where R is the radius of the cylindrical helix cutting edge K and the helix lead P of the helix cutting edge P=(ipncosan)/cosll