The spiral denaturation method of gear pinion machining is proposed on the basis of denaturation processing. Its essence is that there is a feed movement along the axis of the production gear in the hobbing process. It is mainly used to process gear pinion in the spiral bevel gear pair and hypoid gear pair of the rear axle of the automobile. When machining gears with this method, first rough cut grooves on the gear pinion rough cutting machine, and then finish cut concave and convex surfaces on the fine cutting machine with denaturing mechanism respectively. In the processing process, on the one hand, the roll ratio of the production wheel and pinion can be changed; On the other hand, the contact area can be corrected by using spiral motion.
The denaturing mechanism mainly controls the rocker worm to press the rollers in the denaturing mechanism through the hydraulic device. When the worm and the cradle worm gear mesh and drive each other, the roller rotates at a uniform speed through the transmission mechanism, so as to force the worm to move along its axis direction while rotating around its axis, so as to add an additional rotation to the rotating motion of the cradle worm gear. The rotary motion of the shaking table obtains an angular acceleration, which changes the curvature of the machined tooth surface of the gear blank, so as to correct the tooth shape. Compared with installing the cutter tilting mechanism, installing the variable mechanism can ensure that the machine tool has better rigidity. Spiral motion can be realized on No102, no106, no641 and other machine tools produced by Gleason company in the United States. During gear cutting, the saddle can move relatively at a constant speed along the axis of the shaking table, and the result is equivalent to that the production wheel changes from plane rotation to space rotation.