The basic principle of high frequency quenching

The workpiece is placed in the inductor wound by a hollow copper tube, through the medium frequency or high frequency alternating current, the induction current of the same frequency is formed on the surface of the workpiece, the surface or local parts are rapidly heated (within a few seconds can be heated 800 ~ 1000 ° C, the heart is still close to room temperature), and the water cooling (or oil cooling) is quickly sprayed (immersed) after a few seconds. Make the surface or part of the workpiece meet the corresponding hardness requirements.

The main method of high frequency quenching

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

Rapid heating combined with immediate quenching cooling.

Through rapid heating, the surface of the steel to be processed reaches the quenching temperature, and the heat is not equal to the center, which is rapidly cooled, only the surface is hardened to martensite, and the center is still the original plastic and ductile annealing (or normalizing and tempering) tissue.