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Principle and method of high frequency quenching

High frequency quenching principle

The workpiece is placed in an inductor wound with a hollow copper tube, and after passing through an intermediate frequency or high frequency alternating current, an induced current of the same frequency is formed on the surface of the workpiece, and the surface or part of the part is rapidly heated (the temperature is raised in a few seconds). 800 ~ 1000 ° C, the heart is still close to room temperature) After a few seconds, immediately spray (dip) water cooling (or spray oil cooling) to complete the immersion work, so that the workpiece surface or local to meet the corresponding hardness requirements.



High frequency quenching

High-frequency quenching is mostly used for surface quenching of industrial metal parts. It is a metal heat treatment method that produces a certain induced current on the surface of the workpiece, rapidly heats the surface of the part, and then rapidly quenches. Induction heating equipment, that is, equipment that inductively heats a workpiece for surface hardening. The principle of induction heating: the workpiece is placed in the inductor. The inductor is usually a hollow copper tube with input intermediate frequency or high frequency alternating current (1000-300000Hz or higher). The alternating magnetic field generates an induced current of the same frequency in the workpiece. The induced current is uneven in the distribution of the workpiece, strong on the surface, and weak inside, to the core close to 0, using this skin effect The surface of the workpiece can be heated rapidly, and the surface temperature rises to 800-1000 ° C in a few seconds, while the temperature rise of the core is small.

Principle of high frequency quenching and main methods

High frequency quenching principle
 Principle and method of high frequency quenching
Main method of high frequency quenching

Induction heating surface quenching (high frequency, medium frequency, power frequency), flame heating surface quenching, electrical contact heating surface quenching, electrolyte heating surface quenching, laser heating surface quenching, electron beam heating surface quenching.

Rapid heating combined with immediate quenching.


By rapid heating, the surface of the steel to be processed reaches the quenching temperature, and the heat is transferred to the center without cooling. The surface layer is hardened to martensite, and the center is still unquenched. The original plasticity and toughness are better (or positive). Fire and tempering) organization.

The principle of high-frequency quenching, after Haituo mechanical and electrical equipment explanation, now finally understands these working principles.
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