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What problems should be paid attention to when melting the cast iron in the medium frequency induction melting furnace?
In production, the frequency of the medium frequency induction melting furnace is generally 1000~2500Hz. Mainly used for melting of special steel, magnetic alloy and copper alloy.
Medium frequency induction melting furnace melting characteristics: The medium frequency induction melting furnace has good adaptability and can melt various grades of molten iron. Since the medium frequency induction melting furnace adjusts the components more conveniently, the process can have a narrower range of the composition of the molten iron, and the casting performance is more stable. The specific range can be divided into multiple grades according to the type of casting, or special component requirements can be customized for individual castings. Because the power supply of the medium frequency induction melting furnace is very large, the heating capacity is also very strong, and different temperature ranges can be given for different castings to meet the requirements of the casting.
Medium frequency induction melting furnace iron liquid batching principle: Since the alloying elements are relatively easy to add, the original ingredient composition should be made equal to or slightly lower than the target composition, so that the adjustment of the additional alloy can be performed after the first test. If a certain component of the molten iron exceeds the target, it is necessary to add a large amount of iron (scrap, pig iron or recycled material) for dilution, which will increase the total amount of molten iron, and the content of other elements will also change greatly. Come to a series of chain reactions. Therefore, neither the ingredients nor the adjustment should exceed the upper limit of the iron composition.
Medium frequency induction melting furnace iron temperature control principle: As long as the mechanical properties and pouring temperature can be met, the temperature of the molten iron should be reduced as much as possible to ensure the life of the refractory material, but in general, the melting temperature of the molten iron should not be lower than 1500.
Medium frequency induction melting furnace feeding principle: When the cold furnace is opened, the coreless furnace should first add a large piece of metal material similar to the inner diameter of the crucible as the furnace block, then add the charge with low melting point and less elemental burning, and then add other alloys. The material, in most cases, is finally in the furnace.
In the state in which pig iron is used as the main melting mode, the feeding sequence is usually: pig iron→ scrap steel→back charge→alloy. If the synthetic cast iron melting process is adopted, the order of addition is generally: carbonizing agent→ scrap steel→returning material→alloy. In the feeding process, the metal should be kept as dense as possible to fill the entire furnace cavity to ensure the maximum utilization of thermal efficiency and improve the melting efficiency, but care must be taken to prevent the material.
Medium frequency induction melting furnace melting molten iron power transmission principle: first low voltage power supply to preheat the charge. Then increase the power supply, generally can be sent to 80% ~ 90% of the full power, while adding the charge while melting, the furnace should be added before the iron material is completely melted, until the temperature of the molten iron meets the requirements, and then the power slag is discharged. In this way, the temperature of the molten iron can be controlled and adjusted more accurately, and the molten iron in the furnace can also be emptied.
The spheroidization treatment characteristics of the medium frequency induction melting furnace molten iron: when the induction electric furnace melts the molten iron, the change of sulfur is not obvious, and the sulfur increase phenomenon does not occur due to coke and the like like the cupola.
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