In the process of induction heat treatment, some process parameters such as heating, cooling, and self-tempering have an impact on the quality of quenched parts, so the relevant process regulations must be complied with. Dongguan Guangyuan inverter induction heating equipment has found out some regulations that should be complied with in the formulation and implementation of induction heat treatment process cards.
1.Heating.
1) Purpose of heating: When heating is completed, the temperature of the surface layer of the part should be equal to or slightly higher than the quenching temperature; Get the right depth of the heating layer.
2) The heating temperature and the depth of the heating layer depend on the following factors: the average effective power transferred to the part during the heating time; heating time; Current frequency.
2.Cooling The parts should be cooled immediately after heating or after a certain pre-cooling time to complete the quenching.
1) The advantages and disadvantages of quenching results are manifested in the following three aspects: hardness value measured directly after cooling; the magnitude of the internal stress in the part; Depth, region, and microstructure of the hardened layer.
2) The quenching result is determined by the following parameters: cooling time; the temperature of the quenching cooling medium (water, oil, aqueous solution of polymers, etc.); The pressure (or flow rate) at the time of ejection of the quenching cooling medium.
3.Self-tempering.
1) The results of self-tempering are manifested in: the reduction of quenching hardness; The degree to which the internal stress is relieved.
2) The result of self-tempering depends on: high value of tempering temperature; Self-tempering time.
3) Self-tempering quality inspection: Measure how much the quenching hardness is reduced, compare the self-tempering parts after quenching with the parts that are not self-tempered (cold through during quenching), and the reduction value of the hardness of the parts made by self-tempering can be obtained; Check for quenching cracks; Use a file to file the surface of the part just after spraying liquid, and observe the surface tempering color (oxidation color) to roughly determine the self-tempering temperature; Direct measurement of the self-tempering temperature with an infrared thermometer is reliable.
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