Reversible deformation correcting method for elliptical gear ring subjected to deformation after carburization

Abstract

The invention provides a reversible deformation correcting method for an elliptical gear ring subjected to deformation after carburization, which comprises the following steps of: measuring the addendum circle diameters of a gear ring which is subjected to ellipse deformation after carburization every 30 degrees, wherein the difference between the measured addendum circle diameters is the major axis and the minor axis of the gear ring which is subjected to ellipse deformation; binding a layer of heat insulation cotton at both sides of the inner end surface of the gear ring in the minor axis-distributed area with iron wires at a moderate tightening degree; and exposing other gear rings and external gear parts. In the quenching process, the elliptical gear ring is heated to 810 DEG C at a heating rate of 60 DEG C / h and is kept for 4 hours. Because the minor axis-distributed area is covered with the heat insulation cotton, the heating rate of the minor axis-distributed area covered with the heat insulation cotton is smaller than that of the major axis-distributed area uncovered with the heat insulation cotton, and the cooling speed of the minor axis-distributed area of the gear ring is smaller than that of the major axis-distributed area in the quenching oil cooling process, thereby correspondingly reducing the difference between the distributed areas with different addendum circle diameters of the gear ring and consequently realizing the reversible deformation correction of the elliptical gear ring.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to an anti-deformation correction method for an elliptical ring gear deformed after carburizing. Background technique [0002] The carburized ring gear is one of the important parts of the reducer. It is easy to deform during the heat treatment process, and the accuracy is difficult to guarantee. [0003] The next process after the rough hobbing of the ring gear is carburizing. During the carburizing process, there are roughly two types of deformation: ellipse and plane warping. [0004] Plane warpage means that the end face of the ring gear is not in a horizontal plane. The occurrence of plane warping can be prevented by taking measures such as carefully stabilizing the pads when loading the furnace. [0005] Elliptical deformation means that the ring gear expands in a certain direction under the action of stress, and shrinks in the opposite direction, result...

AI Technical Summary

Problems solved by technology

[0012] During the quenching and heating process, both the ring gear and the tooling swell up. Because of the different expansion coefficients, the ring gear grows much larger than the tooling, so that the tooling will be separated from the workpiece. At this time, the tooling cannot support the inner hole of the ring gear. The circle may deform again, so this method is generally not used

[0013] The tooling-assisted correction method above has high tooling cost, difficult operation, unsatisfactory effect and low success rate

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