How should we prevent deformation defects caused by quenching workpieces using medium frequency induction heating power?

The application of medium frequency induction heating power supply is becoming more and more widespread. It is widely used in the quenching heat treatment of gears, crankshafts, connecting rods and other workpieces. However, when medium-frequency induction heating equipment heats these workpieces, affected by various factors, defects such as quenching cracks, insufficient hardness, and deformation will occur. Today, we will take a look at the deformation defects of these workpieces. How should we prevent them?

Compared with the general heat treatment process, the workpiece uses a medium-frequency induction heating power supply for induction quenching. Due to fast heating and shallow hardened layer, the deformation is relatively small. Anyone who does workpiece heat treatment knows that the design structure of the part and its induction quenching process have a great impact on the quality of heat treatment. Next, we will talk about how to prevent deformation defects in workpieces from these two aspects.

1. Reduce deformation defects in part design structure and technical requirements

1) In terms of material selection, for any material with a low critical cooling rate of steel, if the corresponding quenching liquid is selected, the deformation will be relatively small.

2) A part with a rectangular cross-section requires only one plane quenching. If only the side that needs to be quenched is quenched, it will be concave. If it is changed to double-sided quenching, the deformation will be greatly reduced.

3) In the design structure of the parts, we should try to avoid too large changes in the cross-section, too large a step difference, and as large a shoulder R as possible, which will help reduce deformation.

2. Measures to reduce deformation in induction hardening process

1) On the basis of reaching the depth of the hardened layer, generally the lower the quenching temperature and the shorter the heating time, the smaller the quenching deformation will be.

2) Selecting a quenching fluid with appropriate additives can reduce deformation; increasing the concentration of polymer quenching fluid can reduce deformation.

3) Uniform heating and cooling. Taking shaft parts as an example, if the concentricity between the inductor and the heated workpiece is good, the heating will be uniform; the more uniform the cooling distance between the injector and the quenched workpiece, the better, especially if the workpiece does not rotate, this is an extremely important factor.

The workpiece is quenched using a medium frequency induction heating power supply in order to improve the wear resistance and service life of the workpiece. However, some defects will inevitably occur during the quenching process. Nowadays, customers have higher and higher requirements for workpiece deformation. It is necessary to master the measures to prevent workpiece deformation. Today, we only introduce some of the measures. If you want to know more or how to prevent the deformation of specific parts, , you can call us for consultation.