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Medium frequency Heat-through furnace Instruction Manual and Precautions

1. The medium-frequency furnace inductor, also known as a through-type inductor, comes in various lengths depending on the length and diameter of the workpiece being heated. However, generally speaking, the medium-frequency... Heat-through furnace The sensor is generally relatively long, with the purpose of ensuring a consistent heating temperature and minimizing the temperature difference between the core and the surface of the workpiece, provided that the heating cycle remains unchanged.

2. Currently, there are basically two types of lining assembly methods for medium-frequency furnace inductors: one is the rammed lining, and the other is the modular lining.

3. Whether it’s a knotted lining or an assembled lining, both will undergo changes when operated continuously at high temperatures. If used improperly, they may even lead to heating materials colliding with and compressing the lining. Therefore, lining materials have a limited service life, which largely depends on the conditions during their use.

4. Intermediate frequency Heat-through furnace Once cracks appear in the furnace lining, if it’s a rammed lining, and the cracks are no more than 2 mm wide, they must be promptly filled with ramming material. If the cracks exceed 2 mm in width, the furnace lining must be re-rammed. In the case of a modular furnace lining, it must be replaced entirely. Therefore, users must take necessary measures based on the actual situation—absolutely avoid rushing into actions that could lead to unnecessary consequences and damage the induction coil.

5. Intermediate frequency Heat-through furnace During the heating process, a large amount of scale—resulting from the oxidation of workpieces being heated—will accumulate inside the induction coil. If the furnace lining is damaged or has cracks and openings, and these are not cleaned up promptly, two problems may arise: First, arcing is likely to occur, triggering the medium-frequency power supply’s overcurrent protection; second, the induction coil windings may easily become punctured, leading to turn-to-turn short circuits in the coil. Therefore, the scale buildup inside the induction furnace must be removed at least once per shift (every 8 hours).

6. Intermediate frequency Heat-through furnace The sensor coil is typically cooled by water flow, and most of the heat generated by the coil is removed through water cooling. Therefore, it is essential to maintain an adequate water flow rate and water pressure to ensure that the copper tubing within the sensor receives sufficient water volume. Consequently, the working pressure of the cooling water should be no lower than 0.2 to 0.3 MPa, with an inlet water temperature below 35°C and an outlet water temperature below 55°C. If the water pressure is insufficient, the sensor coil may vaporize and overheat. If this condition is not detected promptly, the copper tubing could rupture, causing water to leak out. Given that the sensor is operating under high-temperature conditions at this point, there is a significant risk of explosion. Thus, water cooling for the sensor is critically important.

7. For the newly produced induction coil that has just been put into operation, after connecting it to the power supply, it must be baked at low power with a heated workpiece placed inside the induction furnace for about two hours. The reason is that during the commissioning process, the manufacturer had to circulate water through the induction coil. After commissioning is complete, there will definitely still be residual water inside the copper tubes of the induction coil—especially in winter, when this water could even freeze into a very thin layer of ice. Therefore, the induction coil will certainly be damp. To ensure the longevity of the furnace lining, it is essential to bake the newly commissioned induction coil at low power first, and only begin production at full power after two hours have elapsed.