Qingdao Vanhon Machinery Technology Co.,Ltd.

Industry News
Common methods of induction hardening of gear ring
Nov 02, 2021

        Induction hardening process is simple, high-efficiency, energy-saving and other characteristics are welcomed by everyone, especially now that the requirements for environmental protection are very strict, induction hardening can be said to be a trend in the general environment, and high-frequency hardening equipment for ring gear is the applied induction Principle of quenching. Gear rings (including outer gear rings and inner gear rings) are commonly used as mechanical transmission parts, especially large-diameter gear rings through induction heating quenching process for surface strengthening, to achieve the required hardness in practical applications.

 Common methods of induction hardening of gear ring(图1) Common methods of induction hardening of gear ring(图2) 

Common methods of induction hardening of gear ring

 

       There are four types of gear ring induction heating hardening, along the tooth groove induction hardening, tooth-by-tooth induction hardening, rotary induction hardening, and dual-frequency induction hardening. The induction hardening along the tooth groove and the tooth-by-tooth induction hardening process are particularly suitable for external and internal gears with large diameters (up to 2.5m or more) and large modulus, but it is not suitable for small diameter and small modulus gears (modulus less than 6).

 

1. Induction hardening along the tooth groove: harden the tooth surface and the tooth root, and there is no hardened layer in the middle of the tooth top. This method heat treatment deformation is small, but the production efficiency is low.

 

2. Tooth-by-tooth induction hardening: the tooth surface is hardened, and the tooth root has no hardened layer, which improves the wear resistance of the tooth surface, but due to the existence of the heat-affected zone, the strength of the tooth will be reduced.

 

3. Rotary induction hardening: single-turn scanning hardening or multi-turn heating and hardening at the same time, the teeth are basically hardened, and the hardened layer of the tooth root is shallow. Suitable for small and medium gears, but not suitable for high-speed and heavy-duty gears.

 

4. Double-frequency induction hardening: preheating the tooth slot at intermediate frequency and heating the tooth top with high frequency to obtain a hardened layer that is basically distributed along the tooth profile.


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