How to Choose an Induction Heating Machine for you?
The induction heating device is applied to the metal workpiece (or graphite) in the electromagnetic field after the variable heating magnetic field is converted by the induction heating coil. At this time, many closed rotating currents are naturally generated in the workpiece. When the current is extremely large, since the current has a thermal effect, a lot of heat is naturally generated. In addition, there is a hysteresis loss inside the workpiece, which also causes a certain amount of heat inside the workpiece. Therefore, the workpiece will heat up sharply in a very short time (in seconds). Any metal material can reach the melting point and the graphite can be sublimated. According to the frequency of the alternating current output by the equipment, the induction heating equipment can be divided into five categories according to the operating frequency: low frequency induction heating equipment, medium frequency induction heating equipment, super audio induction heating equipment, high frequency induction heating equipment and super high. Frequency induction heating equipment.
Since the alternating current of the induction heating device has a skin effect when flowing in the conductor, as the frequency of the current increases, the current tends to flow through the surface layer of the conductor. Therefore, these five types of induction heating equipment have different characteristics, let us look at the characteristics comparison of these five induction heating equipment:
1. The frequency of low-frequency induction heating equipment is the lowest, the frequency range is generally around 50HZ to 1KHZ, and the commonly used frequency is mostly power frequency. The relative heating depth is the deepest, and the heating thickness is the largest, about 10-20mm; Mainly used for the overall heating, annealing, tempering and surface quenching of large workpieces.
2. The frequency range of the medium frequency induction heating equipment is generally around 1KHZ to 20KHZ, and the typical value is about 8KHZ. The heating depth and thickness are about 3-10 mm. Medium frequency induction heating equipment is mostly used for heating, annealing, tempering, quenching and surface hardening of large workpieces, large diameter shafts, large diameter thick wall pipes, large modulus gears and other small diameter bars. , calcination and so on.
3. The frequency range of super-audio induction heating equipment is generally around 20KHZ to 40KHZ. The super-audio induction heating device heats the depth and thickness of the workpiece by about 2-3 mm. It is mostly used for deep heating, annealing, tempering, quenching and tempering of medium-diameter workpieces, heating, welding, thermal assembly of medium-diameter thin-walled pipes, medium gear quenching, etc.
4, the frequency range of high-frequency induction heating equipment is generally around 40KHZ to 200KHZ, commonly used 40KHZ to 80KHZ. The high frequency induction heating device heats the depth and thickness of the workpiece, about 1-2 mm. Most of them are used for deep heating, red punching, calcining, annealing, tempering, quenching and tempering, surface quenching, medium-diameter pipe heating and welding, heat assembly, pinion quenching, etc. for small workpieces.
5. The frequency of ultra-high frequency induction heating equipment is relatively high, and the frequency range is generally above 200KHZ, which can be as high as tens of MHZ. The heating depth and thickness are the smallest, about 0.1-1 mm. Ultra-high frequency induction heating equipment is mostly used for local small parts or extremely thin rod quenching, welding, surface quenching of small workpieces.