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Medium frequency induction heating quenching equipment is a common problem after quenching defects

The medium frequency induction heating quenching equipment is common to the workpiece parts after the quenching defect problem, specifically the quenching hardness is not enough to meet the requirements, soft blocks, deformation deviation and quench crack cracking, and local melting and melting.

The quenching hardness after surface quenching is not enough: the quenching hardness after surface quenching is not the most common phenomenon, such problems occupy more than 90%, and the root cause is ultimately in many aspects.
Medium frequency induction heating quenching equipment is a common problem after quenching defects

1. Various factors of raw materials

The raw material of the workpiece itself does not match the content indicated by the workpiece, and is shoddy. Therefore, the length of time during quenching causes the workpiece to melt or not after the quenching temperature is reached or exceeded.

The identification method often used by experienced teachers is the spark identification method. It is the simplest method. Regular inspection of the product workpiece is performed by grinding the spark on the high-speed rotating grinding wheel. It is possible to know whether the carbon content of the product workpiece changes or not. The higher the carbon content, the more sparks.

2. The quenching heating temperature is insufficient or the pre-cooling time is long.

For some non-technical reasons, the quenching heating time is too short, resulting in insufficient quenching heating temperature or too long pre-cooling time, resulting in too low temperature during quenching. Taking medium carbon steel as an example, the former has a lot of undissolved ferrite contained in the quenched structure, and the latter has a structure of torsite or sorbite.

3, insufficient cooling
1 When the automation equipment is quenched, it may be because the spray cooling area is too short, and after the product workpiece is quenched, the heat of the core causes the surface layer to self-temper after passing through the spray area (the stepped shaft is most likely to occur when the step is in the upper position) , the surface layer self-tempering temperature is too high, often can be sensed from the surface layer color and temperature.

2 When the heating method is used, the cooling time is too short, the self-tempering temperature is too high, or the spray hole is reduced due to scale dirt and dirt, and the self-tempering temperature is too high (the gear quenching with the spray hole is too high) Inductive coils are the most prone to such defects.

3 quenching liquid (water temperature oil temperature) temperature is too high, or the pressure is insufficient to cause the flow to decrease, the concentration changes, the quenching liquid is mixed with scale oil and so on.

4 Coolant (oil) is used for too long. After the dirt is generated, the spray hole is partially blocked, which is characterized by insufficient local hardness, and the soft block area often corresponds to the blocked position of the spray hole.


Dongguan Haituo Electromechanical Equipment Co., Ltd. is a manufacturer of medium and high frequency induction heating equipment developed earlier in China. It is a high-tech private enterprise specializing in R&D, design, manufacturing, sales and service. enterprise. With a strong technical R & D team, experienced, customized automatic induction heating equipment according to the workpiece and process, free to provide customers with personalized process solutions. As well as a comprehensive after-sales service system in various parts of the country, we have won the trust of many famous domestic enterprises, and have the experience of providing quality products and services to them. Welcome to visit the company.
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