The use of heating frequencies is very important for variable frequency induction heating equipment, and GuangYuan·GuangZhiYuan Technology has analyzed about heating frequencies.
At room temperature, the relationship between the induced current flows into the workpiece surface of the workpiece and the current frequency f (he) is: depth = 20 / √F, the frequency increase, the current penetration depth is lowered, the hardenating layer is lowered.
Common current frequency is:
1, high frequency heating: 100 ~ 500Hz, often used 200 ~ 300kHz, for electronic tube high frequency heating, the hardening layer is 0.5 to 2.5m, suitable for small and medium-sized parts.
2, medium frequency heating: current frequency is 500 to 1000Z, often 2500 to 80 Hz, and the power supply device is a mechanical intermediate frequency heating device or a thyristor intermediate frequency generator. The hard layer depth is ~ 10m. Suitable for larger diameter axes, medium large gears, etc.
3, the power frequency heating: the current frequency is 50. The mechanical power frequency heating power supply is used, and the hardened layer is deep up to 10 to 20 m, and the surface is suitable for surface quenching of large diameter workpieces.