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How to Preheat the Medium Frequency Induction Melting Furnace?


Before melting, the preheating of the medium frequency induction melting furnace is essential. It ensures the furnace has a long service life. The preheating process for a medium frequency induction melting furnace typically involves several steps.

Judian Medium Frequency Induction Melting Furnace

Check the Power Supply

Before starting the preheating process, ensure that the power supply to the furnace is switched off and that all safety measures are in place.

Inspect the Induction Melting Furnace

Visually inspect the furnace to ensure that it is free of any debris or foreign objects that could affect its performance.

  1. 1. Check the bottom and inner wall of the crucible, and repair it in time if you find depressions and cracks.
  2. 2. Check the furnace roof, furnace nozzle, and furnace cover. If looseness is found, pay attention to trimming and fastening.
  3. 3. Check the induction coil. If iron filings and other debris are found on it, clean it up immediately.
  4. 4. Check the connecting bolts, and if they are found to be loose or fall off, they must be replaced and tightened in time.
  5. 5. Check the water-cooling circulation system, focusing on the water-cooling cable, to ensure that the water supply is smooth and there is no leakage.
  6. 6. Check the mechanical turning device of the furnace body, which is very important for safe production. If any fault is found, eliminate it in time.

Prepare the Furnace Lining

The lining of the furnace should be prepared by applying a coating of refractory material. This will help to protect the lining from the high temperatures generated during the melting process.

Turn On the Power Supply of the Induction Melting Furnace

Once you have completed the above steps, switch on the power supply to the furnace.

Set the Frequency and Power

Set the frequency and power to the required levels for the preheating process. This will depend on the type of material being melted and the size of the furnace.

Monitor the Temperature of the Induction Melting Furnace

Monitor the temperature of the furnace using a pyrometer or other temperature-measuring device. The temperature should be slowly increased until it reaches the desired level for the melting process.

  1. 1. When using an induction furnace, preheat the crucible to about 200°C for 30 minutes without adding materials. And then dry it for 60 minutes. This is done to allow the moisture on the surface of the crucible to evaporate and prevent bursting in the early stages of use.
  2. 2. After preheating, the crucible should be heated to 900°C-1000°C (about 2 hours) as soon as possible, keep the temperature for 20-30 minutes, and then return to the temperature when the metal needs to be smelted. This is done so that the crucible can quickly pass through the temperature region prone to oxidation.

After each preheating, you only need to keep the electric furnace running. Unless the furnace is shut down or the crucible is damp again, there is no need to preheat again.

Maintain the Temperature

Once the desired temperature has been reached, maintain it for a period of time to allow the furnace to reach thermal equilibrium.

Begin the Melting Process

Once the preheating process is complete, the furnace is ready to be used for the melting process. Add the material to be melted and adjust the power and frequency as necessary to achieve the desired melting rate and temperature.

It's important to follow all safety procedures and guidelines when working with an induction melting furnace, as the high temperatures and electrical currents involved can be hazardous. It's also important to consult the manufacturer's instructions and guidelines for your specific furnace model to ensure that you are following the correct procedures for preheating and operating the furnace.

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