Intermediate frequency furnace conventional casting considerations

A.3.1 The following precautions are well known to melters and foundries and are common knowledge not only for hollow induction melting furnaces but also for all metal melting operations. It is only common sense here and not all types of operations. These matters should be clearly stated and appropriately expanded or improved by the individual operator.
A.3.2 The smelting and casting operations shall be limited to those who have a certificate of conformity, or those who have passed the factory training assessment or operate under the direction of qualified engineers and technicians.
A.3.3 Field personnel should always wear safety glasses with a protective frame and should use special filters when observing high temperature metal.
A.3.4 Persons working at or near the fire side should wear insulated and refractory overalls. Synthetic chemical fiber (nylon, polyester, etc.) should not be worn near the fireside.
A.3.5 Furnace linings should be checked frequently at regular intervals to prevent “depletion”. The furnace lining should be checked after cooling. The thickness of the lining (excluding asbestos sheets) must be repaired when the wear is less than 65mm-80mm.

A.3.6 The feeding should be carefully avoided to avoid the “cross-bridge” of the material. The ultra-high temperature of the metal under the “bridge” will cause the lining corrosion to accelerate.
A.3.7 The new induction furnace should be properly selected, adapted to the metal to be smelted, and completely dried before the feed is melted. Material sintering procedures should strictly follow this article.
A.3.8 Low-melting materials such as aluminum and zinc should be carefully added to high-temperature liquid such as steel. If the low melting point additive sinks before melting, it will violently boil and cause spillage or even explosion. Special care should be taken when adding galvanized tubular charge.
A.3.9 The charge should be dry and free of flammable materials, without excessive rust or moisture. The violent boiling of liquid or flammable materials in the charge can cause the molten metal to overflow or even explode.
A.3.10 Movable quartz crucibles can be used when both metal and induction furnace sizes are suitable. They are not designed for the high temperature of molten iron metal. The manufacturer's performance specification should be a guide to use.
A.3.11 When the metal is transported into the crucible, the bracket must be used to support the sides and bottom of the crucible. The bracket must be managed to prevent the cock from slipping out during casting.
A.3.12 Knowledge of the relevant smelting chemistry should be known. For example, chemical reactions such as intense boiling of carbon can cause equipment damage and personal injury. The temperature of the heated solution should not exceed the required value: if the temperature of the molten iron liquid is too high, the life of the lining is greatly reduced, because the following reaction SiO2+2(C) [Si] +2CO occurs in the acid lining. The reaction reaches 1500 °C in the molten iron. The above is carried out very quickly, and the composition of the molten iron also changes, the carbon element is burned, and the silicon content is increased.
A.3.13 The area to be received shall be kept in an empty volume. Contact with hot metal in contact with liquids can cause violent explosions and personal injury. Other residues can prevent the molten metal from flowing into the overflow tank or igniting the fire.
A.3.14 The overflow tank shall be ready to receive molten metal at any time during the operation of the induction furnace. Spills may appear without warning. At the same time, if the induction furnace has to be evacuated as soon as possible and the drum (iron ladle) is not suitable, the induction furnace can be dumped directly into the overflow tank.
A.3.15 Personnel who are artificially implanted with organs, joints, plates or the like should be kept away from any inductive equipment. A magnetic field near the device can induce current on any metal implant. People who are implanted with a cardiac pacemaker are especially dangerous and should stay away from any sensory equipment.

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