A heat treatment method for controlling heat treatment deformation of an inner ring gear

Abstract

The invention provides a heat treatment method for controlling the heat treatment deformation of an internally toothed ring, which comprises the steps of: cleaning the internally toothed ring withoutdamages on detection surfaces and then drying the internally toothed ring; feeding the dried internally toothed ring into a heating chamber for nitrocementation; placing a cylindrical or annular mandrel in the internally toothed ring after the nitrocementation, the mandrel and the internally toothed ring being in interference fit; conducing electromagnetic induction quenching to the internally toothed ring equipped with the mandrel; tempering the quenched internally toothed ring gear, the mandrel being still assembled with the internally toothed ring during the tempering; and cooling the internally toothed ring to room temperature to separate the mandrel from the internally toothed ring. With adoption of the heat treatment method provided by the invention, the heat treatment process has high efficiency and good effect, and the quenching deformation of the internally toothed ring is avoided as much as possible, thereby ensuring the dimensional accuracy and roundness of the internally toothed ring. The method is especially applicable to the heat treatment process of internally toothed rings with a relatively large diameter and small thickness.

Description

technical field [0001] The invention relates to the technical field of heat treatment in the production process of an inner ring gear, in particular to a heat treatment method for controlling heat treatment deformation of an inner ring gear. Background technique [0002] The inner ring gear is widely used in various transmission mechanisms, such as agricultural machinery, family cars, heavy engineering vehicles, etc. The inner ring gear needs to undergo heat treatment after processing to obtain excellent mechanical, physical and chemical properties, and meet the strict requirements of use. The current heat treatment process of the inner ring gear, one is the soft nitriding treatment process, which is characterized by small deformation of the inner ring gear and is easy to control, but there are problems such as shallow hardening depth and relatively low service life; another The carburizing and quenching process is adopted. This process has a deeper hardened layer and a hig...

AI Technical Summary

Problems solved by technology

However, this method also has obvious defects, that is, when the inner ring gear needs to be heated and quenched, the tooth-shaped tire will cover the surface of the inner ring gear, affecting the heating and cooling effect of the inner ring gear, which will affect the final result. Heat treatment effect

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