Luoyang HongtengIntermediate frequency induction furnace
The melting furnace body of the circuit is mainly composed of induction coil, refractory material and magnetic yoke. The induction coil is wound from a hollow copper tube, and then the tube is cooled by water. The section of the copper pipe can be round or square, and the square is more efficient. Inside the induction coil, a crucible made of refractory material is knotted. The metals to be smelted, such as various steels, are placed in the crucible, and then the electromagnetic induction heating principle is used. When the induction coil passes an intermediate frequency current, an intermediate frequency magnetic field is generated , in which most of the magnetic field passes through the steel and is called the main flux. However, there is still a part of the magnetic field that does not pass through the steel, which is called leakage flux. Only the main magnetic flux can generate an induced potential in the steel, form an eddy current, and make the steel in the furnace heat up. The leakage magnetic flux forms a leakage current, which only reduces the voltage on the circuit, but cannot complete the heating. The relative magnitude of the main flux and leakage...
Every user hopes that their electric furnace can work for more time, so that the production line can produce more products and bring considerable benefits to themselves. However, when the smelting furnace is working, many factors will affect the service life of the furnace, such as the structure of the furnace body, the material of the furnace lining, the operation method in the production process and so on. Of course, the smelted metal material will also have an impact on the furnace age. Today we will share this knowledge with you. The first is some rust dirt in the charge, as well as a lot of sand adhering to the return charge, these substances will aggravate the erosion effect on the furnace lining, so we should clean the dirt on the charge as much as possible before using it. Among the materials that need to be smelted, high-chromium cast iron has the least erosive effect on the furnace body and lining due to the low smelting temperature, but special attention should be paid to the feeding method of the return material. High-chromium cast iron has poor thermal conductivity and high brittleness. When the cold material is suddenly added to the...
Since the establishment of the company, Hongteng has been committed to serving users around the world, so we have many production lines under construction and put into production all over the world. Today, the editor of Hongteng summarized some quality control problems in the smelting process when the electric furnace is at work, and would like to share it with you. Heat preservation of molten iron: The heat preservation of molten iron at high temperature will cause temperature changes, element burning loss, dissolved gas and changes in the state of the molten iron itself. Therefore, if long-term heat preservation is required, the temperature of heat preservation should be reduced as much as possible. For example, a small amount of clean and dry return material can be added to cool down, and the surface of molten iron can be covered with slag made of glass and other materials. Selection of molten iron composition: When several castings are to be cast in the same molten iron, the largest batch of castings or the most important castings should be batched as much as possible. During the process of pouring molten steel, the carbon content in the furnace will continue to decrease. , you...
The biggest feature of induction furnace heating is that the workpiece can be directly heated, the workpiece heating speed is fast, the temperature is easy to control, and no metal impurities are mixed in the heating process, so it has a wide range of applications. The most common applications of induction furnaces are in the machinery manufacturing industry and metallurgical industry, so what are the specific uses of induction furnaces? Red Teng editor to introduce to you. Quenching: heating the workpiece to a certain temperature and then cooling it down quickly, so that the metallographic structure of the workpiece is changed to a certain extent, thereby increasing the hardness and wear resistance of the workpiece, which is called quenching. However, after the workpiece is quenched, it will become very brittle and the fatigue resistance will deteriorate. In order to solve this contradiction, there is a surface quenching process. Induction heating is the most ideal heating method for surface hardening, which can meet the surface hardening requirements of the workpiece by controlling the heating depth and heating time. Diathermy: During the heating process, the internal and surface temperatures of the entire workpiece are approximately equal, which is called diathermy. The advantages...
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...
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