Machining method of gear involute internal spline

Abstract

The invention discloses a gear involute internal spline machining method and a gear. The gear involute internal spline machining method comprises the following steps: S1, punching an internal hole in the gear through finish turning; S2, machining an internal spline in the internal hole for the first time; S3, coating the surface with the internal spline with a layer of anti-seepage paint; S4, mounting the gear on a special tooling and subjecting the gear to carburizing treatment; S5, dismounting the gear from the special tooling and subjecting the internal spline to secondary finish machining in the internal hole; and S6, mounting the gear on the special tooling again and subjecting the gear to quenching treatment. According to the gear involute internal spline machined by utilizing the above technological process, the carburizing treatment process and the quenching treatment process are performed separately; before the carburizing treatment process, the surface of the internal spline of the gear is coated with the anti-seepage material, thereby reducing the tooth surface hardness of the internal spline and guaranteeing the secondary finish machining of the internal spline; and by adoption of the special tooling, non-uniform shrinkage during heat treatment is avoided and the machining precision is improved.

Description

technical field [0001] The invention relates to the technical field of gear processing, in particular to a gear involute internal spline processing method. Background technique [0002] In the gearbox assembly, some gears must use involute inner splines to connect with involute outer splines on the shaft due to structural and assembly constraints, so as to transmit torque. [0003] In the current gearbox gear processing industry, the processing process of the gear involute internal spline is as follows: first, the inner hole is fine-turned before heating; second, the spline is processed before heating; finally, carburizing and quenching. That is, the internal spline is processed in the pre-heating process, and the post-heating process does not require secondary finishing. This processing method has the following disadvantages due to the deformation of the internal spline heat treatment and the inability to perform secondary finishing after heat treatment: [0004] 1. The p...

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Problems solved by technology

[0004] 1. The precision loss of the internal spline after heating is large, and because the involute spline is centered on the tooth side, after the gear is assembled on the shaft, the gear precision is low in the assembly state, which increases the risk of gear meshing noise;

[0005] 2. After heating, the upper and lower ends of the inner spline are inconsistent in the distance measurement, and there is a taper phenomenon

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