NC Grinding Method for Side Relief Surface of Plane Secondary Envelope Toroidal Worm Gear Hob

Abstract

The invention relates to a numerical control grinding method for planar double-enveloping ring surface worm gear hob rear side edged surfaces, and belongs to a machining method for a planar double-enveloping ring surface worm gear hob. The method comprises the steps that a unit normal vector of each point on start lines of rear edged surfaces on the two sides of each cutter tooth on a cutting edge belt surface is obtained; according to a given rear side edged surface angle, a unit normal vector of each point on the start lines of the rear edged surfaces on the two sides on the rear edged surfaces on the two sides is obtained; a hob rotating angle and a rotary table rotating angle are adjusted, a grinding wheel generative face normal vector is made to be consistent to the unit normal vector of each point on the start lines of the rear edged surfaces on the two sides on the rear edged surfaces on the two sides, the radial distance and the axial distance between the rotary table center and the hob center are adjusted, the grinding wheel generative face makes contact with each point on the start lines of the rear edged surfaces on the two sides, the grinding wheel external circle is tangent to the hob tooth root annular face, and the planar double-enveloping ring surface worm gear hob two-side rear edged surfaces ensuring the cutting edge belt width consistency and the rear side edged surface angles are obtained through grinding. Numerical control grinding of the planar double-enveloping ring surface worm gear hob rear side edged surfaces is achieved.

Description

technical field [0001] The invention relates to a numerical control grinding processing method for the flank surface of a worm gear hob on a plane secondary enveloping torus, and belongs to the processing method of a plane secondary enveloping torus worm gear hob. In particular, it relates to a method for grinding the side relief surface of a plane quadratic enveloping toroidal worm gear hob to ensure the consistency of blade width and side relief angle, so as to meet the requirements of blade width consistency and side relief angle The NC machining requirements of the plane quadratic enveloping torus of the worm gear hob side relief angle. Background technique [0002] Compared with the cylindrical worm drive, the toroidal worm drive has strong bearing capacity, small size, high transmission efficiency and long service life. The double-enveloping toroidal worm drive with plane, double cone, etc. has more superior performance than the straight-profile toroidal worm drive. ...

AI Technical Summary

Problems solved by technology

However, the manufacture of the secondary enveloping toroidal worm gear hob for hobbing and cutting the worm gear is very complicated and difficult to manufacture, because the secondary enveloping toric worm gear hob and the worm of the secondary enveloping toroidal worm drive have the same Helicoid, the cutting edges on both sides of each tooth are different curves, each point on the cutting edge curve has a different helix angle on the hob helicoid, and each tooth needs to reserve a width of 0.1-0.2 mm secondary enveloping toroidal worm gear hob helical surface as the edge band, and grinding the side relief angle with a relief angle of 6-8°

[0003] In order to solve the machining of the flank surface of the secondary enveloping toroidal worm wheel hob, the Chinese patent (ZL93120467.4) trims the grinding wheel according to the normal section of each tooth, feeds in a spiral, and processes the side surface by grinding. Relief surface to control the width of the blade, but different grinding wheel sections need to be trimmed when grinding each tooth, and the angle of the side relief surface cannot be guaranteed to be consistent; Chinese patent (ZL201010104684.1) and Chinese patent (application number 201110206581.0 ) Grinding the side relief surface by changing the transmission ratio of the worktable where the hob and the grinding wheel are located, respectively using the conical grinding wheel grinding head and the inclined plane grinding wheel supported by the tapered pressure grinding block, but the width of the land and the angle of the side relief surface cannot be guaranteed Consistent; Chinese patent (Application No. 201310172562.X) provides a design method for the side relief angle of the quadratic enveloping toroidal worm gear hob. After finding the starting line of the relief surface, the The lead angle rotates the corresponding relief angle, and then according to the forming transmission ratio of the relief surface, the helix cluster on the relief surface can be obtained, and then the relief surface can be milled out by CNC machine tool surface processing method, but the processing efficiency is not high

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