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Several Commonly Used Tempering Methods in Induction Quenching and Tempering Equipment

High-frequency quenching equipment uses the skin effect, that is, induction heating technology, to quickly raise the temperature of the workpiece surface, and can raise the surface temperature of the workpiece to 800-1000℃ in a few seconds.

With the development of industry, the induction heating technology of high-frequency quenching equipment has been continuously improved and its uses have been expanded. After the workpiece is quenched by high-frequency quenching equipment, it needs to be tempered in time to reduce the brittleness of the quenching transition zone, eliminate the internal stress after quenching, improve the plasticity and toughness, and achieve the required mechanical properties.

The hardness of the workpiece after high-frequency quenching is higher than that of ordinary quenching, and the hardness after tempering is easily lowered. Next, let's introduce several commonly used tempering methods for induction quenching and tempering equipment:

Self-tempering of induction quenching

The so-called self-tempering is to control the cooling time of the high-frequency quenching equipment's induction quenching, so that the workpiece surface is quenched but not completely cooled, and use the residual heat in the quenching zone to quickly conduct to the quenched surface of the workpiece and reach a certain temperature to temper the quenched surface layer. The surface temperature changes when the induction quenched workpiece self-tempered. Self-tempering is suitable for workpieces that are simultaneously heated and quenched and have simple shapes.

Induced tempering of induction quenching

Long-axis and sleeve-type workpieces after induction quenching sometimes use induced tempering. Induced tempering is usually matched with induction quenching to form an induction heating heat treatment production line. After the workpiece is heated and cooled by the quenching induction coil and water cooling circle, it continues to be heated by the tempering induction coil.

Compared with furnace tempering, induction quenching tempering has a shorter heating time and faster heating speed, which results in a greatly dispersed microstructure. The wear resistance and impact toughness after tempering are higher than those of furnace tempering.

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