in induction hardening

Release time:

Mar 26,2025

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Clearly, quench cooling is an integral part of the induction hardening process. Natural cooling is rarely used because it is too slow, and most quenching is done with forced cooling using water, oil, brine, or moving air. Water is most commonly used because it has good thermal conductivity.

 

Shot quenching is a quenching method in which the entire surface to be quenched is heated at the same time, and then the workpiece is immersed in a quenchant or sprayed over the entire heated surface.

 

Travel quenching is a localized heating method using a smaller induction coil. The induction coil moves relative to the heated surface and the quench is immediately applied after heating. This method allows a small induction coil and relatively low power to heat a large surface in one heating cycle.


The angle of incidence of the water spray is important and must be 50°, which allows uniform cooling and uniform hardened layer depth without local heating zones. In order to achieve the above-mentioned stagnation process between the water sprayer and the heat source, attention should be paid to the spacing between the heating inductor and the water sprayer. Almost all shaft quenching uses the end quenching of the shaft, in order to give the best uniformity, the shaft not only moves in the axial direction, but also rotates. 

 

The quenchant is sprayed through the inductor for spraying. It is a special quenching oil tank, in which the workpiece is heated and then falls into the tank for one-time quenching and cooling. Stationary water sprayer. The workpiece is placed in the induction coil, and after heating, the water sprayer sprays water between the induction coils for quenching. This method is often used for gear quenching. For uniform quenching, the workpiece must be rotated during heating and cooling. (The spray angle must be 30°~50° to the workpiece). 

 

A device combining an induction coil and a water sprayer. This device is particularly useful when the stagnation time is very short. For example, it can make the cessation of heating and quenching and cooling almost instantaneous. Low alloy steel, low carbon steel and simple cast iron workpieces are quenched with water. Alloy steel, high carbon steel and high hardenability steel and workpieces with uneven cross-sections are quenched with oil (fire safety measures must be taken when using oil quenching). Low hardenability steel is sometimes quenched with salt water, and stainless steel can be quenched with air. For alloy steels with small cross-sectional areas, compressed air can be used for quenching.

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