What problems will occur after high-frequency quenching heating?

What problems will occur after the gear is heated by high-frequency quenching, and what aspects should be paid attention to when quenching and cooling?

Most of the common problems are quenching cracking, the core hardness after quenching is too high, the hardness after quenching is insufficient, the hardness after quenching is uneven, the depth of quenching hardening is not enough, and the quenching deformation is too bad.

These common quality problems are often related to gear material, quenching heating and quenching cooling. Of course, the operator’s technical mastery also has a certain relationship. What is worth noting is the quenching cooling. The gear quenching usually uses quenching oil, water-soluble quenching medium or tap water.

Insufficient quenching hardness, uneven hardness and insufficient hardening depth of gears are caused by the low quenching cooling rate. However, the material, shape, size, and heat treatment requirements of the quenched gears are different, and it can be divided into insufficient cooling rate in the high temperature stage, insufficient cooling rate in the medium and low temperature stage, and insufficient cooling rate in the low temperature stage.

Insufficient quenching hardness is mostly caused by insufficient cooling rate in the middle and high temperature stages. When gears with large modulus require a deeper hardened layer, it is very necessary to increase the low-temperature cooling rate.

Relatively speaking, the quenching oil has a short vapor film stage, a fast medium temperature cooling rate, and a fast low temperature cooling rate, which can often obtain high and uniform quenching hardness and sufficient quenching depth.

These are the common problems and suggestions on the high-frequency hardening and heating of gears. In addition to technical problems, we should also pay attention to the problems of high-frequency hardening and heating equipment. A good equipment will make you even more powerful!