Common problems and treatment methods of high frequency quenching equipment for ingots and bars

1. Decarbonization

Decarburization is mainly caused by the decarburization of the raw material itself exceeding the processing requirements. Therefore, we should strengthen the quality inspection of the raw material before heat treatment.

Second, the microstructure is unqualified (quenched martensite needle is thick) This defect is mainly caused by the high heating temperature. Therefore, in the process of heat treatment using a high-frequency quenching furnace, we should appropriately reduce the heating temperature to ensure that the heating temperature meets the requirements.

3. Deformation out of tolerance The causes and preventive measures are as follows:

1. The stress relief annealing is not sufficient. Therefore, we should use a high-frequency quenching furnace for sufficient annealing treatment. Shakes during heating or cooling, therefore, we should ensure that the workpiece enters the cooling medium vertically when operating to prevent the spindle from colliding with other objects.

2. If the preheating temperature is uneven or the time is short, we should reasonably select a preheating furnace with good temperature uniformity, and the preheating time should be sufficient.

4. Low hardness or uneven hardness

The reasons for this defect and its preventive measures are as follows: The quenching temperature is low or the heating time is short, we should strictly implement the requirements of the heat treatment process parameters. The cooling speed is slow or the cooling medium is not suitable. Therefore, during the quenching heat treatment, we should quickly Parts are picked out for graded quenching to avoid excessive air cooling time, and a reasonable cooling medium should be selected.

5. Fracture

The reasons for fracture defects and their preventive measures are as follows: The quenching temperature is abnormal, so when using the high-frequency quenching furnace for quenching heat treatment, we should strictly implement the heat treatment process requirements. The organization of the raw material is unqualified, therefore, we should inspect the organization of the raw material to ensure that it meets the requirements before it can be put into production.