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Let's take a look at the details of high frequency heating
Presumably in real life, we can roughly understand and explain what kind of heating process is, but what about this high-frequency heating? How do you understand it, can you understand it wrong? Well, it is still Kehua's professional People come to explain that high frequency heating is better. High-frequency heating High-frequency heating High-frequency heating, that is, induction heating, is a method of using electromagnetic induction to heat electrical conductors (usually metals), which will generate eddy currents in the metal and cause Joule heating of the metal due to electrical resistance. Induction heaters include an electromagnet through which high-frequency alternating current is passed. If the object has a large magnetic permeability, it may also generate heat due to the loss of magnetic hysteresis. The AC frequency used depends on the size and metal type of the item to be heated, the degree of coupling between the heating coil and the item to be heated, and the depth of penetration. High-frequency heating heat treatment Induction heating is commonly used in the heat treatment of metal parts. The most common application is induction hardening of steel parts, brazing and soldering in order to combine metal parts, and annealing of parts to be softened in steel parts. Induction heating can generate high power density, can reach the required temperature in a short contact time, and can adjust the magnetic field to precisely adjust the part to be heated, reducing thermal deformation and damage. The above heat treatment can be used for local hardening, resulting in parts with different properties. A common application of hardening is to create a locally hardened area that resists corrosion, but retains the toughness of other parts. The depth of induction hardening can be adjusted by adjusting the induction frequency, power density and contact time. This process is limited in flexibility, so special inductors need to be fabricated in some applications, which are generally expensive, and require a large current density in a small copper wire inductance, requiring special engineering techniques and copper- fitting. High-frequency heating Details of high-frequency heating The power supply for induction heating is generally low-voltage and high-current alternating current. The workpiece to be heated is placed in an electromagnetic coil driven by alternating current, usually with a capacitor, set as an LC circuit to generate imaginary power, and the alternating magnetic field generates eddy currents in the workpiece. Because of its hysteresis, the magnetic material will enhance its heating effect. Materials with high relative permeability (100–500) are also easier to heat, and the hysteresis occurs below the Curie temperature, where the material still maintains its original magnetic properties. The high permeability of the workpiece below the Curie temperature is quite useful. Temperature difference, specific heat and mass all affect the heating of the workpiece. The energy conversion of induction heating is affected by the distance between the coil and the workpiece. The loss of energy includes heat conduction, heat convection and heat radiation between the work and the fixture. The induction coil is generally made of copper tube, and it is cooled by water. The diameter, form and number of coils affect the efficiency and the shape of the magnetic field. High-frequency heating and its related content, Kehua's professionals have explained it to you here. Now we finally understand this high-frequency heating, and you must have learned a lot.