The local induction heating of the circular bar is mainly composed of a single hole heating furnace, a porous heating furnace, a rectangular induction furnace, and a U-shaped induction furnace. Among them, the porous induction heating furnace has the widest application range and the highest heating efficiency.

 The porous induction heating furnace has the following main features:

1. The porous induction heating furnace can be used for heating the end of the billet.

2. The porous induction heating furnace can be used for intermediate heating of the blank.

3. The heating efficiency is high when the round material is locally heated with respect to the rectangular inductor and the U-shaped inductor.

4. It is easy to realize the temperature detection of the blank of each hole.

5. Sound and light alarms are set for each hole to remind workers to discharge.

6, the degree of automation is low, generally use manual input and output. If a mechanical device is used, it is necessary to configure a plurality of pusher devices and a discharge device, or a mechanism with a complicated structure.

7. The feeding roller facilitates the entry and exit of the billet and reduces the labor intensity of the worker.

8. The equipment structure is simple and the production cost is relatively low.

9. It is affected by the manual operation speed and is suitable for the production process with relatively small output.