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Precautions for Medium-Frequency Furnaces
Precautions for Medium-Frequency Furnaces
General precautions for medium-frequency induction furnaces:
The following precautions are well known to foundry workers. They apply universally to all metal-melting operations, not just coreless induction melting. These are provided as general guidelines and should not be construed as exhaustive for every type of operation. They should be evaluated in light of your specific process and supplemented or modified as necessary.
- Do not operate this equipment if any safety device has been bypassed, short-circuited, or is inoperative.
- Melting and pouring operations are restricted to designated personnel.
- Personnel should always wear safety goggles with side shields, and when observing hot metals, they should use special neutral-density glasses.
- Personnel working near or alongside electric furnaces shall wear heat‑resistant and flame‑retardant clothing. Synthetic materials (such as nylon, polyester, etc.) must not be worn in the vicinity of electrical circuits.
- The furnace lining should be inspected regularly to prevent the risk of furnace leakage. After cooling, the furnace lining must be thoroughly checked.
- When charging the electric furnace, exercise caution to prevent “bridging” of the charge. The excessively high temperature of the molten metal beneath the bridge can lead to rapid erosion of the furnace lining.
- The new furnace lining must be made of the appropriate material and be compatible with the charge to be melted. Prior to charging the electric furnace for melting, the new lining should be thoroughly dried. The sintering procedure for this material must be strictly followed.
- Low-melting-point materials (such as aluminum or zinc) should be added cautiously to a high-temperature molten pool (e.g., iron or steel). If such low-melting-point additives settle before melting, they may evaporate violently, leading to boiling or even an explosion.
- The materials to be loaded should be dry and free of combustibles, excessive rust, or liquids. The rapid vaporization of liquids or combustibles can cause boiling or explosions in the metal melt pool.
- Removable crucibles may only be used with the metals and electric furnace sizes for which they are specified. They are not designed to withstand the high temperatures required for melting ferrous metals. The specifications provided by the crucible manufacturer should serve as the guiding reference for their use.
- When transferring metal using a crucible, a support frame must be used to provide appropriate lateral and bottom support. The support frame must be equipped with a device that prevents the crucible from slipping during pouring.
- You should be familiar with the chemical properties of your melt. Chemical reactions—such as rapid carbon boiling—can damage equipment and pose a hazard to personnel.
- Areas that may contain leaked or splashed materials must not accumulate liquids. Contact between hot metal and liquid can trigger violent explosions, resulting in injuries. Other debris may obstruct the flow of molten metal into the receiving pit or ignite, leading to fires.
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