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What is the working principle of high-frequency quenching equipment

2020-11-03

High frequency quenching equipment is a heat treatment method that uses high frequency current (30K-1000KHZ) to heat and cool part of workpiece surface to obtain Case-hardening layer. This method only strengthens the surface of the workpiece to a certain depth, while the core basically maintains the structure and properties before treatment, thus obtaining a combination of high strength, high wear resistance, and high toughness. Due to local heating, it can significantly reduce quenching deformation and reduce energy consumption. It is precisely because high-frequency quenching has these characteristics that it is widely adopted in the mechanical processing industry.
The high-frequency quenching equipment adopts induction heating, and the engineer explains the principle of induction heating: the workpiece is placed in an inductor, which is usually a hollow copper tube with input of medium frequency or high-frequency alternating current (1000-300000Hz or higher). The alternating magnetic field generates the induction current of the same frequency in the workpiece. The distribution of this induction current in the workpiece is uneven. It is strong on the surface, but weak inside, and close to 0 at the center. Using this Skin effect, the workpiece surface can be heated rapidly, and the surface temperature rises to 800-1000 º C within a few seconds, while the center temperature rises very little.