Step-link shaft superaudio induction quenching method and special induction coil thereof

Abstract

The invention discloses a step-link shaft superaudio induction quenching method. The step-link shaft comprises a large-diameter shaft and a small-diameter shaft; and a transition round corner is formed between the large-diameter shaft and the small-diameter shaft. The method comprises the following steps: selecting a suitable induction coil according to the large-diameter shaft; packaging the induction coil in a part which needs to be quenched; and rotating the step-link shaft, wherein the input voltage of the induction coil is 380V; the input power of a superaudio induction heating power supply is between 150 and 250KW; and the oscillation frequency of the superaudio induction heating power supply is between 25 and 40 KHZ. The invention also provides a special induction coil of the method. The special induction coil is provided with a bracket, two magnetic conductors and a plurality of groups of coils embedded in grooves of the magnetic conductors; the bracket is provided with an upper conducting surface and a lower heat conducting surface which are arranged in parallel and have arc-shaped cross sections; the two magnetic conductors are respectively arranged on the heat conduction surfaces; and the diameters of the heat conducing surfaces are the same as those of the large-diameter shaft. The step-link shaft superaudio induction quenching method and the special induction coil thereof have the advantages of ensuring the depth of a hardening layer of the step-link shaft, performing self-tempering by using afterheat, reducing a processing cycle and reducing production cost.

Description

technical field [0001] The invention relates to a step shaft super-audio frequency induction hardening method and a special induction coil thereof, belonging to the technical field of metal heat treatment technology and equipment. Background technique [0002] In the previous process, in order to achieve a hardened layer of 4-7mm on the step shaft, an intermediate frequency quenching machine tool must be used. The characteristic of the intermediate frequency quenching machine tool is that the depth of the hardened layer of the workpiece is 5-10mm. , it is impossible to complete the workpiece with 2-5mm hardened layer, so that it is impossible to realize the same equipment to complete the workpiece required by multiple processes. [0003] like figure 1 Shown is a stepped shaft, the stepped shaft includes a large diameter shaft and a small diameter shaft, and there is an excessive fillet R between the large diameter shaft and the small diameter shaft, wherein the difference b...

AI Technical Summary

Problems solved by technology

[0005] 1. It is easy to produce step shaft induction hardening cracking;

[0006] 2. Induction heating and quenching adopts two clamping, and the production efficiency is low;

[0007] 3. The excessive fillet R between the large-diameter shaft and the small-diameter shaft is generally heated by prolonging the heating time, which is easy to overheat and burn or quench the sharp corner.

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