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The main working principle and advantages of high frequency heating machine_Kehua
At present, the high-frequency heating machine has the highest heating efficiency, fastest speed, low consumption and environmental protection for metal materials. It has been widely used in various fields of hot processing, heat treatment, hot assembly and welding, smelting and other processes of metal materials. It can not only heat the workpiece as a whole, but also purposefully heat the part of the steel part; it can realize the deep heat penetration of the workpiece, and it can only heat the surface and surface of the workpiece; it can not only heat the metal material directly, but also heat Non-metallic materials for indirect heating, etc. Therefore, the electromagnetic induction heating process will eventually become more and more common. A surface heat treatment process in which the workpiece is locally heated by an induced current. This heat treatment process is commonly used for case hardening, but can also be used for partial annealing or tempering, and sometimes for bulk hardening and tempering. In the early 1930s, the United States and the Soviet Union began using induction heating to surface harden parts. With the development of the manufacturing industry, the high-frequency heating machine solution technology has been continuously improved, and the application range has also grown steadily. Basic principle: The high-frequency heating machine puts the workpiece into the inductor (coil). When an alternating current of a certain frequency is passed into the inductor, an alternating magnetic field is generated around it. The electromagnetic induction of the alternating magnetic field produces a closed induced current (eddy current) in the workpiece. The distribution of the induced current on the cross section of the workpiece is very uneven, and the current density on the surface of the workpiece is very high and gradually decreases inward. This phenomenon is called the skin effect. The electric energy of the high-density current on the surface of the workpiece is converted into heat energy, which increases the temperature of the surface layer, that is, surface heating is realized. The higher the current frequency, the greater the current density difference between the surface layer and the inside of the workpiece, and the thinner the layer is when heated. After the temperature of the heating layer exceeds the critical point temperature of the steel, it is rapidly cooled to achieve surface quenching. Function and application: The main advantages of the high-frequency heating machine are as follows: ① No overall heating is required, the deformation of steel parts is small, and the electromagnetic energy consumption is small. ②No pollution. ③ The heating speed is fast, and the surface oxidation and decarburization of the workpiece is lighter. ④Surface hardening layer can be adjusted according to need, easy to control. ⑤The heating equipment can be installed on the machining production line, which is easy to realize mechanization and automation, easy to manage, and can reduce transportation, save manpower and improve production efficiency. ⑥The martensite structure of the hardened layer is finer, and the hardness, strength and toughness are higher. ⑦After surface quenching, the surface of the steel has a great reduction in thermal stress, and the steel has a higher potential for relieving fatigue and breaking.