Spherical involute spiral Archimedes spiral bevel gear cutting method and machine tool

Abstract

The invention discloses a tooth cutting method for a bevel gear with spherical involute toothed archimedes spiral teeth and a machine tool thereof. The method overcomes the disadvantages that the current tooth cutting method forms principle errors, has complex revision calculation, trial cutting and adjustment of a machine tool, and the like. The tooth cutting method adopts a machine tool with double stations and a single cutter head, which can continuously tooth dividing. When teeth are cut, the I station at one side of the cutter head completes the rough cutting of tooth sockets and the finishing cutting of the concave tooth surfaces of teeth; then the II station at the other side of the cutter head completes the finishing cutting of the convex tooth surfaces of the teeth, each cutter tooth straight edge on a cutting tooth cutter head envelopes and cuts out the side surfaces of the teeth, the circular arc edge of tooth top cuts out the tooth root, and the rough cutting concave edge cuts off the margins of the tooth sockets; and when the teeth are cut, a cutter head shaft and the tooth blank shaft are in a spatial cross position, the rotating end surface of the cutter head is perpendicular to the tangent plane of the gear blank base cone, the cutter head, the gear blank and the big circular plane of an imaginary spherical surface rotate in an uniform speed, the cutter head is in the rotary feed when cutting the teeth, and the continuous hobbling base cone toothed portion is the spiral bevel gear of Archimedes. The invention provides a machine tool, a cutter head and a cutter tooth for realizing the tooth cutting method.

Description

technical field [0001] The invention relates to a spiral bevel gear cutting method and a machine tool, more precisely, it relates to a spherical involute tooth profile Archimedes spiral bevel gear cutting method and a machine tool. Background technique [0002] There are many types of helical bevel gears used for intersecting shaft transmission. The tooth curves are different according to the pitch cone. The common ones are arcs, extended epicycloids, quasi-involutes, and Archimedes spirals. The tooth profile of the bevel gear should be a spherical involute, but in fact, the widely used Gleason spiral bevel gear and the Oerlikon extended epicycloid spiral bevel gear respectively use single teeth For the Face-Milling Method and the Face-Hobbing Method, since the cutterhead teeth all adopt straight-line blades with tooth profile angles, and the tooth blanks are generated by pure rolling of pitch cones, the obtained The tooth profile of the tooth surface is not a spherical inv...

AI Technical Summary

Problems solved by technology

The tooth profile of the bevel gear should be a spherical involute, but in fact, the widely used Gleason spiral bevel gear and the Oerlikon extended epicycloid spiral bevel gear respectively use single teeth For the Face-Milling Method and the Face-Hobbing Method, since the cutterhead teeth all adopt straight-line blades with tooth profile angles, and the tooth blanks are generated by pure rolling of pitch cones, the obtained The tooth profile of the tooth surface is not a spherical involute, so the excellent performance of the spherical involute meshing is lost, such as the instantaneous speed ratio is constant, the change of the transmission angle does not affect the speed ratio, the contact area of ​​the conjugate tooth surface is not sensitive, and the processing gear interchangeable etc.

Especially when shrinking gears are used, the current gear cutting method often constitutes a principle error, which requires complicated correction calculations, machine tool trial cutting, and repeated adjustments, and there are a series of disadvantages

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