subject: High Frequency Induction Heating Technology - 4d Electric Key Shell - 4d Duplicable Transponder Chip [print this page] High frequency induction heating technology
Lu Jian
You can imagine that an iron bar on January 2 seconds could be heated red-hot right? Any metal can be quickly heated to its melting it?
This is what a human can do now and master the most efficient direct heating method for metal materials?? High frequency induction heating.
Heating of one's objects, one using coal, oil, gas and other energy products of combustion heat; second is the use of electric furnaces and other electrical appliances will be converted into heat energy. The heat only by way of heat transfer (heat conduction, convection and radiation) to pass to the need for heating the object, but also to achieve the objective of heated objects. Because these heating methods, by heating the object is achieved by absorbing external heat to warm up. Thus, they are all indirect heating methods.
We know that the heat transfer law of nature that is: heat only from the high temperature to low temperature and high temperature body temperature body to the high temperature part of the transfer to the low part of Nature. Therefore, only when the external heat, the temperature was more than, higher than the heated object, can be effectively heated. This requires using a lot of energy to the establishment of a heated object than was needed to heat more and more and more high temperature, high temperature. Such as stoves, ovens and so on. Thus, not only heat, only a minority of these can be delivered to the heated body, causing a great waste of energy. And heating for a long time in the combustion, the heating process, but also produce large amounts of harmful substances and gases. They both will be heated by the damage caused by corrosion, but also on atmospheric pollution. Even the use of electric furnaces and other electric heating methods, although the pollution-free, but there are still inefficient, high cost and slow heating rate disadvantage.
Scientific progress and development, so we both heating metal objects or metal objects on heating, can be used efficiently, fast, and very energy saving and environmentally friendly way to heat. This is the direct heating method. For non-metallic materials, adopt the operating frequency of about 240MHZ and above, and make their internal molecular, atomic vibrations per second, more friction on a million times microwave heating. For metallic materials, can be used in thousands of hertz frequency (KHZ) to several hundred kHz, megahertz (MHZ) above midrange, high frequency induction heating. Low-frequency induction heating can also be used, such as the frequency 50HZ and so on.
Frequency, high frequency induction heating, is the frequency (50HZ) AC frequency conversion generally 1KHZ to hundreds of KHZ, or even higher frequency alternating current. Using electromagnetic induction principle, inductive coil through the magnetic field into the same frequency, the effect on the magnetic field in the metal object. Use of eddy current effect, the metal objects to generate the magnetic field strength is proportional to the induced spin current (or eddy current). By the spin current through a metal object within the resistance, to convert it into heat. Along with the hysteresis effect, skin effect and edge effect, it can generate some heat, which together make metal objects, the rapid rise of temperature, rapid heating purposes.
High-frequency current skin effect, can make metal objects in the vortex increases with frequency, while the concentration of the metal surface circulation. This current can control the frequency to realize the depth of control heating metal objects. Both to improve the quality of processing, but also to ensure full use of the energy is. As for the red red, hot calcined and the whole piece annealed, and other techniques, because the heating needs of the depth of large parts or even need to heat through. At this time of induction heating equipment can reduce the operating frequency; when used for surface hardening heat treatment, etc., They need the heating depth is small, then the operating frequency can be increased. On the other hand, the smaller of the workpiece or pipe, plate, use high-frequency heating method, for larger jobs, use frequency heating method.
As the induction heating time is short, fast, and or non-contact (objects do not need an induction loop heating contact) heating. Therefore, the heating mode than other phenomena of oxidation and decarburization are relatively minor, generally do not need to do to protect gas processing, indeed necessary, is easier to carry out gas protection.
The rapid development of electronic technology to make electronic components, whether the quality, effectiveness or on the reliability, have a lot of progress. In the volume being much more compact, miniaturized. This induction heating technology to provide better conditions for the development and Space. In the small-signal generation and processing, control and protection, regulation and display in such areas as greater use of higher reliability, better stability, a stronger anti-interference digital circuits. The power components, the more energy is large, low efficiency, high voltage, radiation larger tube, generation to generation by SCR, FET (MOSFET), developed to the IGBT (insulated gate bipolar transistor ). Machine's power usage has been increased to 95% above (tube power utilization is only about 60%), cooling water tube product than the savings of about 60%. And can achieve 24 hours of continuous work. This not only normal use during the day can also lower peak electricity tariffs in the discount of the night.
As the induction heating, with less energy consumption, power consumption, heating speed, no pollution, no noise, no preheating, oxidation is not easy, easy gas protection, and automatic control, with a number of intelligent protection, safe, reliable, easy to operate can take place without interruption and so on. More and more manufacturers, customers, from coal heating, diesel heating, gas heating and electric stove, electric oven, switch to the high frequency induction heating up! Both state-owned enterprises, private, or private, foreign, all metal heat treatment, metal thermal processing, metal welding and metal smelting, refining and other industries are increasingly using high frequency induction heating equipment. Therefore, the market is very broad!
High frequency induction heating equipment main purposes:
1, heat treatment
For example: shaft, gear, quenching and annealing stainless steel products.
Second, the workpiece through the heat
Eg: fasteners, standard parts, auto parts, hardware, rigging, twist drills, etc. hot hot upsetting.
3, melting
For example: gold, silver, copper, aluminum, lead and precious metals.
4, heat with
For example: motor, solenoid valves, sleeve type and so on.
5, welding
For example: all the same or dissimilar metal welding, etc. of Qian.
