The medium frequency induction heating equipment performs induction hardening on the drive shaft, how to determine the heat treatment process?

As an important part of the car, the drive shaft must bear huge friction during the working process. In order to meet its working performance requirements and improve its wear resistance, hardness and service life, we usually use medium frequency induction heating equipment to quench it Heat treatment, today, let's take a look at how the heat treatment process plan is determined.

The material used for the drive wheel shaft is 30CrMnMoB. When the heating equipment quenches it, the sensor used is a ring sensor, the inner diameter of the sensor is rp=178rnm, and a water spray ring is attached to the lower end of the sensor.

1. The size of the sensor gap

The larger the sensor gap, the slower the heating rate, and the longer it takes for the parts to reach the phase transition temperature, so the depth of the hardened layer is deeper, otherwise, the depth of the hardened layer is shallower.

2. Depth of hardened layer of parts

It is related to the frequency of the power supply used, the moving speed of the parts, the heating power, the size of the sensor gap, and whether it is preheated.

The intermediate frequency induction heating equipment used for the intermediate frequency quenching of the driving wheel shaft is: 8000Hz, 160kW. The depth of the hardened layer of the workpiece quenched by intermediate frequency is generally 2 to 4mm, so the drive axle is quenched by intermediate frequency.

3. Heating power

Under the condition that other conditions remain unchanged, the greater the heating power of the part, the deeper the depth of the hardened layer; on the contrary, the smaller the heating power of the part (under the premise that the part can reach the quenching temperature), the deeper the depth of the hardened layer shallow.

4. The moving speed of parts

When other conditions remain unchanged, the moving speed of the part is inversely proportional to the depth of its hardened layer, that is, the faster the moving speed of the part, the shallower the depth of the hardened layer, and the slower the moving speed of the part, the deeper the depth of the hardened layer. deep. For this part, if medium-frequency induction heating equipment is used for quenching, the moving speed of the part should be slowed down, but if the moving speed of the part is too slow, it will lead to problems such as high quenching temperature of the part, coarse quenching structure of the part, and easy quenching cracks of the spline, so a suitable moving speed of the parts should be debugged through tests to meet the technical requirements of its hardened layer depth of 7-16mm.