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What are the heating methods for induction hardening?

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Update time : 2019-03-06 08:55:00
Due to the different shapes of the heating parts and the different areas of the hardened zone, it is necessary to use a variety of suitable heating processes to operate. In principle, they are divided into two categories:

1. Simultaneous heating and hardening

The entire hardening zone is heated at the same time, and cooling is performed immediately after the heating is stopped. During the heating process, the relative position of the parts and the inductor does not change. The method of simultaneous heating can be divided into two methods of part rotation and non-rotation in application. The cooling method can be divided into two ways of falling into the sprinkler and the inductor spraying liquid. From the perspective of improving generator utilization efficiency (except for one generator supplying multiple hardening machines), after the simultaneous heating method, the parts fall into the water sprayer, and the productivity and generator utilization efficiency are higher than the inductor spray method.

2. Scan hardening

Scanning hardening is also called continuous hardening. In this method, a part of the area to be hardened is heated, and the relative movement between the inductor and the heating part causes the heating area to gradually move, thereby realizing the heating of all areas to be hardened. Scanning hardening can also be divided into two types of hardening: rotating parts and non-rotating parts. In addition, there are scanning circumferential hardening, such as the outer contour hardening of the large cam; scanning plane hardening, such as the flat round file plate surface hardening, also belongs to scanning hardening. Scanning hardening is suitable for situations where a large surface area needs to be heated and the power of the power supply device is insufficient. A lot of production experience shows that, under the same power supply, the production efficiency of the simultaneous heating method is higher than that of the scanning hardening method, and the area of the hardening equipment is reduced accordingly. For shaft parts with steps, when scanning and hardening, from the large diameter to the small diameter steps, due to the deviation of the electromagnetic field of the inductor, there is often a transition zone with insufficient heating, so that the hardened layer does not continuous. At present, the longitudinal current simultaneous heating method has been commonly used to keep the hardened layer of the stepped shaft continuous over the entire length, so that the torsional strength of the shaft is improved.
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