What is the difference between electromagnetic induction heating and high-frequency electromagnetic heating?
We all know that electromagnetic induction technology is divided into five frequencies. What are the differences between electromagnetic induction heating and high-frequency electromagnetic heating? What are the advantages of high-frequency electromagnetic heating products? Maybe few friends know about it! Let Kehua talk about it! 1. Electromagnetic induction heating and high-frequency electromagnetic heating The difference between heating Electromagnetic induction heating technology is currently mainly divided into 5 kinds of frequencies: low frequency, medium frequency, super audio frequency, high frequency, ultra high frequency. 1. Low-frequency induction heating method The frequency is the lowest, and the frequency range is from power frequency (50HZ) to about 1KHZ, and the commonly used frequencies are mostly power frequency. The relative heating depth is the deepest and the heating thickness is the largest, about 10-20mm; Mainly used for overall heating, annealing, tempering and surface quenching of large workpieces. 2. Medium frequency induction heating method Frequency range: generally about 1KHZ to 20KHZ, the typical value is about 8KHZ. The heating depth and thickness are about 3-10mm. It is mostly used for heating, annealing, tempering, quenching and tempering and surface quenching of large workpieces, large diameter shafts, large diameter thick-walled pipes, large modulus gears and other workpieces, as well as red punching and forging pressing of smaller diameter bars. 3. Ultra-audio induction heating method Frequency range: generally 20KHZ to 40KHZ (because the audio frequency is 20HZ to 20KHZ, so it is called super-audio). Heating depth and thickness, about 2-3mm. It is mostly used for deep heating, annealing, tempering, quenching and tempering of medium-diameter workpieces, heating, welding, and hot assembly of large-diameter thin-walled pipes, and medium gear quenching, etc. 4. High frequency induction heating method Frequency range: generally 40KHZ to 200KHZ, commonly used 40KHZ to 80KHZ. Heating depth, thickness, about 1-2mm. It is mostly used for deep heating, red punching, forging pressing, annealing, tempering, quenching and tempering, surface quenching, medium diameter pipe heating and welding, hot assembly, pinion quenching, etc. for small workpieces. 5. Ultra-high frequency induction heating method The frequency is relatively high, and the frequency range is generally above 200KHZ, which can be as high as dozens of MHZ. The heating depth and thickness are the smallest, about 0.1-1mm. It is mostly used for quenching and welding of local extremely small parts or extremely thin bars, surface quenching of small workpieces, etc. Due to the skin effect of the alternating current flowing in the conductor, that is, as the frequency of the current increases, the current tends to flow through the surface of the conductor. High-frequency electromagnetic heating 2. Advantages of high-frequency electromagnetic heating products 1. Long service life Electromagnetic heating basically does not generate heat due to the coil itself, long service life, no maintenance, and no maintenance and replacement costs; the heating part adopts a ring cable structure, and the cable itself will not Generates heat and can withstand high temperatures above 500°C with a service life of up to 10 years. No maintenance is required, and there is basically no maintenance cost in the later period. 2. Safe and reliable The outer wall of the barrel is heated by high-frequency electromagnetic action, the heat is fully utilized, and there is basically no loss. The heat is accumulated inside the heating body, and the surface temperature of the electromagnetic coil is slightly higher than the room temperature, which can be touched safely without high temperature protection, which is safe and reliable. 3. High efficiency and energy saving The internal heat heating method is adopted. The molecules in the heating body directly induce magnetic energy to generate heat. The hot start is very fast. The average preheating time is shortened by more than 60% compared with the resistance coil heating method, and the thermal efficiency is as high as 90% or more. Under the same conditions , Save 30-70% electricity than resistance coil heating, greatly improve production efficiency. 4. Accurate temperature control The coil itself does not generate heat, the thermal retardation is small, the thermal inertia is low, the temperature of the inner and outer walls of the barrel is consistent, the temperature control is accurate in real time, the product quality is significantly improved, and the production efficiency is high. 5. Good insulation The electromagnetic coil is made of customized special high-temperature and high-voltage special cables, with good insulation performance, no direct contact with the outer wall of the tank, no leakage, short-circuit failure, and safety. 6. Improve the working environment The injection molding machine whose electromagnetic heating plate has been transformed by electromagnetic heating equipment adopts the internal heating method, the heat is accumulated inside the heating body, and the external heat dissipation is almost no. The surface temperature of the equipment can be improved to the point where the human body can touch it, and the ambient temperature is reduced from above 100°C when the resistance coil is heated to normal temperature, which greatly improves the working environment of the production site, effectively increases the enthusiasm of production workers, and reduces the cost of ventilation and cooling in the summer plant area. In line with the concept of 'people-orientedHigh-frequency electromagnetic heating What are the differences between electromagnetic induction heating and high-frequency electromagnetic heating? After reading the content brought by Kehua above, I believe everyone understands it clearly. High-frequency electromagnetic heating products have many advantages, higher heating efficiency than traditional heating wires, and greatly save energy. If you need it, you can buy it from Kehua.