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How to make heating technology better in medium frequency furnace melting

In the principle of induction heating, the biggest feature is that the workpiece is directly heated. The biggest advantage of this is that the workpiece heating speed is fast and the thermal field is uniform, the temperature is easy to control, metal impurities are not mixed in the heating process, and the workpiece heating metal is less burned, and the worker Labor conditions are also good, so it is widely used in industrial production. At present, in the mechanical manufacturing equipment industry, especially the metallurgical industry, induction heating is mainly used for casting smelting, diathermy, quenching, sintering and brazing. According to the frequency of the induction melting furnace, the induction melting furnace of the foundry industry is divided into a power frequency induction furnace, an intermediate frequency induction furnace and a high frequency induction furnace. The medium frequency induction furnace has high efficiency, fast melting speed, easy control of molten metal temperature, less burning of alloy elements and uniform chemical composition. Therefore, the product quality is high, which is particularly beneficial for melting various high-grade alloy steels. The technology is relatively mature and gradually It is used by many foundry companies and has a wide range of applications. Induction heating is used for heat transfer mainly in forging, hot stamping, hot rolling, extrusion and bending and heating and annealing. The induction heating process can make the surface of the whole workpiece and the internal temperature tend to be equal, the heating efficiency is high, the speed is fast, the metal burning loss can be reduced, the temperature is controlled, the heating quality is ensured, and the advantages of the automatic production line are easily formed, and the invention is more and more widely used. application.

Quenching is to heat the workpiece of the heat treatment technology to a certain temperature and then quickly cool it, so that the metallographic structure of the workpiece can be changed accordingly, thereby increasing the hardness and wear resistance of the workpiece. In the past, due to the limitation of the heating method, the fatigue resistance of the workpiece after quenching was deteriorated, and the brittleness of the workpiece was increased. In order to solve this contradiction, the method of heating only the surface of the workpiece (without heating inside) and then rapidly cooling the metal surface is quenched, which increases the hardness and wear resistance of the workpiece, and the interior of the workpiece is not quenched. Maintain the original strength. Induction heating is the ideal heating method for surface quenching.

However, the best application and most significant benefit of induction heating technology is still in the melting of the foundry industry. In the past decade or more, due to the improvement of power supply status, domestic foundry companies are increasingly using induction furnaces for metal melting and heat preservation operations. This is mainly because the induction furnace has the advantages of low melting energy consumption, small metal burning loss, easy control of chemical composition, flexible operation and convenience, and the operating environment of the induction furnace is less than that of other metal melting equipment. Easy to organize and manage production.

Induction furnaces are now the preferred furnace equipment for the design and technical transformation of new foundry workshops. In particular, the application of computers in induction furnaces, furnace condition monitoring, fault diagnosis and leak alarm devices, and even the process control of smelting and pouring operations are increasingly perfected and expanded, further highlighting the advanced nature of induction heating technology. In order to meet the needs of high-tech super-precision alloys, the medium-frequency furnace has continuously researched new induction electric furnaces, such as plasma induction furnaces, vacuum induction furnaces, furnace-free water-cooled copper-bismuth induction furnaces, and magnetic floating induction furnaces, and other new technologies and equipment. The cutting-edge industry plays a more important role.


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