How to choose the current frequency when the induction heating furnace heats the billet?
The selection of the current frequency when the induction heating furnace heats the billet is shown in the table
Selection of current frequency when steel billet is diathermy
|
Diameter of blank /mm |
Current frequency/Hz |
|
|
Below the Curie point |
Higher than the Curie point |
|
|
6 -12 |
3000 |
450000 |
|
12-25 |
960 |
10000 |
|
25-38 |
960 |
3000 -10000 |
|
38-50 |
60 |
3000 |
|
50 -150 |
60 |
960 |
|
>150 |
60 |
60 |
It can be seen from the table that when the blank is heated at a temperature below the Curie point, the frequency can be one tenth of the Curie point due to the shallow penetration of the current. If dual-frequency heating is used, such as PC steel bars, before and after the Curie point Using different current frequencies can improve heating efficiency. Recently, a 30Hz frequency conversion power supply has been developed to heat large-diameter billets.
