Milling method of helical chip flute of toroidal worm gear hob

Abstract

The invention relates to a method for milling a toroidal worm wheel hob spiral chip groove and belongs to a machining method of a toroidal worm wheel hob. According to the technical scheme, the equipment comprises a hob basic worm (1), a cylindrical milling cutter (2), a turntable (3), a worm axis (4), a milling cutter axis (5) and a turntable axis (6), wherein the hob basic worm (1) rotates along with the axis C; the cylindrical milling cutter (2) rotates around the turntable axis (6) along with the axis B; the axis B and the axis C are linked to machine a hob spiral chip groove (7) with a radius of Rf and an arc-shaped groove bottom; a hob rake face (8) is formed, and rake angles on two sides of each cutter tooth on the graduated ring surface are 0 degree.

Description

technical field [0001] The invention relates to a milling method for a spiral chip groove of a toroidal worm gear hob, which belongs to the processing method of a toroidal worm gear hob. Background technique [0002] The worm wheel in Dong Xuezhu's "Toroidal Worm Drive Design and Modification" is usually hobbed and cut, and the hob for hobbing and cutting such a worm wheel is called a toroidal worm gear hob. The helical surface is processed from the blank to form the basic worm of the hob, and the chip groove and the relief surface are further processed from the basic worm of the hob to obtain the toroidal worm gear hob. Chip flutes are usually divided into two types: straight flutes and spiral flutes. When the number of heads of the toroidal worm gear hob is small, the helix angle on the basic worm helical surface of the hob is small, and straight flutes can be used. At this time The negative rake angle on both sides of the cutter tooth is small, which has little influence...

AI Technical Summary

Problems solved by technology

For the toroidal worm gear hob, because the helix angle γ on the basic worm helical surface of the hob is different: on the indexing annulus, along the axial direction of the hob, there is a tendency that the center is small and the ends are large. Compared with the method of machining the spiral chip flute, the rake angle on both sides of each tooth on the indexing ring surface cannot be guaranteed to be 0°, so the good cutting performance of the tooth cannot be guaranteed

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