The quenching depth (hardening depth) depends on the output frequency of induction heater. Generally, higher frequency will bring smaller quenching depth (shallower).
The relationship between the frequency f and the heating depth δ has the following empirical formula:
δ=20/√f(20°C)；δ=500/√f(800°C)。
The relationship between the frequency f and the heating depth δ has the following empirical formula:
δ=20/√f(20°C)；δ=500/√f(800°C)。
Where: f is the frequency, the unit is Hz; δ is the quenching depth, the unit is millimeter (mm).
The relationship between the output frequency and the quenching depth (the cooling medium is tap water) at 800 °C is shown in the table below:
The relationship between the output frequency and the quenching depth (the cooling medium is tap water) at 800 °C is shown in the table below:
| d/mm | f/KHZ |
|---|---|
| 0.76 | 450 |
| 1.14 | 200 |
| 2.11 | 100 |
| 2.26 | 50 |
| 3.20 | 25 |
| 5.08 | 10 |
| 9.27 | 3 |
| 16.05 | 1 |
| 22.71 | 0.5 |
| 37.85 | 0.18 |
| 65.53 | 0.06 |
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