Luoyang HongtengIntermediate frequency induction furnace
As the main equipment of the forging industry and the foundry industry, the electric furnace has some points that need to be paid attention to in its daily use. Today, the editor of Hongteng will share with you the knowledge about the use of the electric furnace. First of all, when installing the electric furnace, it is necessary to standardize the connection between the transformer, the intermediate frequency power supply, and the intermediate frequency electric furnace, and select cables of suitable materials. Especially for induction coils and water-cooled cables, increasing their cross-sectional area can effectively reduce current heat loss. The intermediate frequency electric furnace can use a special rectifier transformer to increase the supply voltage and limit the no-load operation of the transformer. Select the appropriate capacity and frequency medium frequency electric furnace according to the casting process, increase the power density to improve the melting efficiency and reduce the additional loss. Regarding the material of the furnace body, you can choose according to your actual situation. If your output is relatively large, we will recommend that you choose the steel shell furnace body first to reduce the heat loss and electromagnetic loss of the furnace wall and furnace mouth....
When the electric furnace is working, not only the temperature in the furnace is high and the change is large, but also it is subjected to strong electromagnetic stirring and the impact of the charging charge, which will cause the lining of the electric furnace to be easily damaged. Therefore, the quality of the lining of the induction furnace directly determines the life of the furnace, which will ultimately affect the production capacity of the entire production line. We previously had an article “Construction Method of Knotted Material for Intermediate Frequency Furnace”, which once introduced the knowledge of knotting of furnace lining to you. Today, let’s expand it and share some knowledge about furnace lining sintering. After the furnace lining is finished, the furnace and sintering process can be carried out. The purpose is to fully remove the moisture in the furnace lining, so that the silica sand is fully and uniformly transformed, and finally sintered at high temperature into a dense ceramic surface with high strength. When baking and sintering, we need to pay attention to the following items: Before the oven, a detailed inspection of the water cooling system, tilting system, control loop and various markings should be...
As a commonly used heating equipment, the intermediate frequency electric furnace has a problem that many users have to consider when using it. That is how to adjust the heating speed of the electric furnace. In response to this problem, we have summarized some knowledge and experience here, and shared with you today. From the analysis of the design of the electric furnace, the heating speed is determined by the heating power of the intermediate frequency furnace, the material of the heating blank and the heating temperature. After these factors are determined, the heating speed of the intermediate frequency furnace is also determined. Therefore, theoretically speaking, the heating speed of the intermediate frequency furnace is fixed, and what will affect the heating speed of the electric furnace at this time is the power output of the electric furnace. In the normal use of the intermediate frequency furnace, the factors that affect the power output of the intermediate frequency furnace, and then affect the speed or heating speed of the intermediate frequency furnace are as follows: (1) The rectifier circuit part of the intermediate frequency furnace is not adjusted properly, the DC voltage does not reach the maximum value, the rectifier...
We have introduced a lot of relevant knowledge about induction furnaces. Today, Hongteng editor will summarize the classification of induction furnaces. Induction furnaces are classified according to their structure, and there are two categories: crucible type (coreless induction furnace) and groove type (cored induction furnace). Crucible coreless induction furnaces can be divided into power frequency furnaces and intermediate frequency furnaces according to different frequencies. According to different structures, grooved cored induction furnaces can be divided into vertical furnaces and horizontal furnaces. In the field of foundry, induction furnaces are used for three purposes: melting, holding and pouring. According to these different uses, electric furnaces can be divided into: melting furnaces, holding furnaces and pouring furnaces. Power frequency crucible induction furnace is mainly used for smelting cast iron and non-ferrous metals. Due to the large electromagnetic stirring force, the life of the furnace lining is very short during steelmaking. Therefore, it is not suitable for steelmaking unless the life of the refractory material can be solved. For non-ferrous metals with strict gas content requirements (such as oxygen-free copper), it is not suitable to use power frequency crucible induction furnaces. When the power frequency crucible induction furnace is used as a holding...
Regarding the use of induction furnaces, there are many things to pay attention to during smelting operations. The editor of Hongteng summed up some knowledge in this area and shared it with you today. Pig iron: For the medium frequency induction furnace with the advantage of rapid smelting, it is agreed that it is better to add pig iron in the early stage of smelting. This is because the shape of pig iron is relatively consistent, and it is easy to obtain high induced current, which is beneficial to improve the smelting speed. Recarburizer: For intermediate frequency electric furnace, it is best to gradually add recarburizer when the metal charge is added. If it is added too early, the recarburizer will adhere to the vicinity of the furnace bottom; if it is added too late, it will not only delay the adjustment of the melt composition in the furnace, but also may cause excessive heating errors. Ferrosilicon: The higher the Si content in the molten iron, the slower the carburization rate is when the carburizer is added. Therefore, for the medium frequency induction furnace with weak stirring force, it is better to add ferrosilicon later. Adding too early, the metal...
Induction furnaces are widely used, and the design of large-scale industrial-frequency crucible induction furnaces often needs to take into account the refractory materials for the furnace lining. In general, the lining materials of induction furnaces are mainly based on the utilization rate and economy of the furnace. In order to ensure the normal operation of the induction furnace, the refractory materials of the furnace lining generally have the following requirements: 1. Sufficient refractoriness Materials with a refractoriness higher than 1580°C are called refractories. The operating temperature of the furnace lining is generally lower than the temperature of the molten metal. However, based on the requirements for the life of the furnace lining, some areas of the furnace body have to be considered, and the temperature is too high. In cast iron induction furnaces, it is often unsafe to use materials with low refractoriness. As the lining material of cast iron induction furnace, its refractoriness should be greater than 1650-1700℃. 2. Good thermal stability Induction furnaces rely on electromagnetic induction to exchange energy. In order to ensure high electrical efficiency of the furnace, the thickness of the furnace lining of the induction coil is limited. In addition, the temperature of the...
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