Luoyang HongtengIntermediate frequency induction furnace
In the heat treatment industry, carbon content will have a great impact on various properties of metals. Commonly used charge in smelting are pig iron, scrap steel and return charge. Pig iron has a high carbon content, but the purchase price is also relatively high. Therefore, the most commonly used material for smelting is scrap steel, which can reduce the cost of castings. If scrap steel is used as raw material, in the process of smelting metal in the electric furnace, due to inappropriate ingredients, insufficient charging and excessive smelting decarburization, sometimes the carbon content in the steel does not meet the requirements of the top stage. At this time, it is necessary to add carbon to the molten steel, and the best way is to use a carburizer. There are many materials that can be used as cast iron recarburizers, commonly used are artificial graphite, calcined petroleum coke, natural graphite, coke, anthracite and mixtures made of such materials. Steel-making recarburizers can be used in different processes such as casting, cast iron, and cast steel. However, recarburizers are suitable for smelting in induction furnaces, but their specific uses vary according to process requirements. When using recarburizer in intermediate frequency electric...
In the previous article “About the selection and use of electric furnace and graphite crucible“, we introduced the crucible, and today we will continue this topic. There are many basic properties of crucibles, such as corrosion resistance, heat resistance, thermal stability and so on. In order to exert these properties, it is necessary to use the crucible with regular operation. Today, Hongteng editor will introduce the precautions for the use of the crucible. First of all, no matter what kind of crucible is, it is not as strong as metal, so we should pay attention when using it, handle it with care, and avoid the crucible from being hit or dropped, which may cause damage to the crucible. In normal times, we should store the crucible in a dry place to avoid moisture or water. Because moisture may react with the substances in the crucible under certain conditions, it will affect the heating effect and cause a large deviation in the performance of the crucible. When the new furnace is used for the first time, the temperature is raised to the operating temperature at a rate of 200 degrees per hour, and then maintained at the operating temperature for a...
Regarding the rebar production line, the manufacturing process is as follows: The steel is melted into molten iron in professional equipment, and then poured into a cast iron mold to form a billet. The slab is heated by various heating furnaces, and after passing through the continuous casting machine and continuous rolling mill, it becomes a new steel bar. The electric furnace,furnace and induction furnace that we have been introducing to you can be regarded as a kind of equipment, that is, a heating furnace specially used to melt molten iron. The principle of heating is to use the intermediate frequency magnetic field eddy current to melt various steel materials. The editor of Collective Red Teng will introduce the characteristics of this furnace to you. The principle of intermediate frequency induction heating is electromagnetic induction, and its heat is generated in the workpiece itself. Ordinary workers can carry out the continuous work of the forging task ten minutes after going to work with the intermediate frequency electric furnace, and there is no need for furnace workers to burn and seal the furnace in advance. Using the principle of electromagnetic induction heating, the heating speed is fast, so the oxidation of...
Induction furnaces can be used in smelting, heat preservation and heat treatment of various metals. The intermediate frequency furnace power supply, as the supporting equipment of the induction furnace, is a frequency conversion device that converts the three-phase power frequency power supply into a single-phase power supply. It has developed from an early intermediate frequency generator set into a thyristor type variable frequency power supply. Later, through continuous development and improvement, it has become a new variable frequency power supply with strong load adaptability and wide application range by virtue of its advantages of fast heating speed and uniform heating. device. The main structure of the intermediate frequency power supply is: rectifier transformer, thyristor rectifier, freewheeling diode, inverter, connecting rectifier, reactor, and corresponding control loop and protection loop. The intermediate frequency power supply equipment has continuous mode and timing fixed power mode, which can be freely set according to the work needs. Before each start of the inverter, the equipment status will be automatically detected. If there are various states that do not meet the startup status, the inverter will automatically display a fault. point, and block the inverter to reduce the risk of accidents. The operation of the intermediate...
The previously published article “How to judge the operation effect of the intermediate frequency furnace based on the sound? “, it is mentioned that if the electric furnace produces a lot of noise during operation, it is likely that there is a problem with a part, and we need to check it carefully before we can solve the problem. But until we get rid of the problem, the loud noise will pollute the surrounding environment and disrupt the concentration of the staff during production operations. Today, the editor of Hongteng will introduce some methods to reduce the noise of electric furnace. 1. Install soundproof doors It is generally required that on the furnace working platform, the noise at a distance of 1m from the furnace body and a height of 1m should be ≤85dB (deducting background noise). Therefore, when installing sound insulation doors for two intermediate frequency furnace rooms, the sound insulation should be greater than 25dB, and the overall sound insulation performance should be in line with national requirements for medium and low frequency noise isolation. 2. Noise reduction of cooling and ventilation system A large amount of heat generated by the electric furnace needs to be discharged in...
In the metal thermal processing industry, graphite crucibles are used for smelting and casting copper, aluminum, zinc, lead, gold, silver and various rare metals when heated by electric furnaces. Graphite crucible is a kind of refractory vessel, which has the characteristics of high temperature resistance and oxidation resistance. It is an indispensable accessory for intermediate frequency electric furnaces. A good graphite crucible can directly improve the melting quality of electric furnaces. How to choose electric furnace graphite crucible? Today, the editor of Hongteng will share with you some methods for selecting graphite crucibles for intermediate frequency electric furnaces. When choosing, the first thing to pay attention to is the size of the crucible, neither too large nor too small, otherwise it will affect the normal use of the crucible. Choose the appropriate crucible material, there are many types of graphite crucibles, silicon carbide graphite crucibles are more popular now. This kind of crucible is manufactured by pressing and forming process, the quality is generally better than that of graphite, the service life is long, and the heat conduction is fast. After we choose a suitable crucible, we also need to check many aspects when using it. For example, check whether...
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