Induction Heating Machines
Induction Heating Machines Manufactor​
Mult-Frequency Induction Heating Machine
Real time Dual-Frequency Induction Heating Machine
Mult-Frequency Induction Heating Machine
Real time Dual-Frequency Induction Heating Machine
FAQ
What are the components of an induction heating device?
An induction heating device is mainly composed of a power supply device, an induction coil, a cooling system, and a control system, etc. The power supply device is used to provide an alternating current; the induction coil is the component that generates an alternating magnetic field, which is usually made of materials such as copper tubes; the cooling system is used to cool components such as the induction coil and the power supply device to prevent overheating; the control system is used to control parameters such as the heating temperature and time.
How does the induction heating frequency affect the heating depth?
According to the skin effect, the induced current mainly concentrates within a certain depth of the surface of the workpiece. The higher the frequency, the more obvious the skin effect of the current is, and the shallower the heating depth will be; the lower the frequency, the deeper the heating depth will be. For example, the penetration depth of low-frequency induction heating can reach dozens of millimeters, which is suitable for the overall heating of large workpieces; while the penetration depth of high-frequency induction heating is usually within a few millimeters, which is mainly used for the surface heating of workpieces.
Why are different induction heating frequencies chosen for ferromagnetic materials and non-ferromagnetic materials?
Ferromagnetic materials have a strong ability to absorb the magnetic field. They can generate a large induced current even at low frequencies, which in turn produces sufficient heat. Therefore, low-frequency or medium-frequency heating is often adopted, enabling deep-layer heating. On the other hand, non-ferromagnetic materials such as copper and aluminum have a weak ability to absorb the magnetic field. They require a higher frequency to increase the intensity of the induced current, so as to achieve effective heating. Usually, medium-frequency or high-frequency induction heating is selected for them.
The cost of high - frequency induction heating equipment is high. Why is it still used in many situations?
Although the cost of high – frequency induction heating equipment is relatively high, in some specific situations, such as when performing high – precision surface treatment on small and precision parts, its advantages are obvious. It can achieve precise temperature control and local heating. This helps improve product quality and reduce subsequent processing procedures. Therefore, considering the overall production cost and product quality comprehensively, it still has a relatively high cost – performance ratio. Moreover, for enterprises with large – scale production, by improving production efficiency and product quality, they can recover the equipment cost more quickly.
How to select a suitable induction heating coil?
Selecting an induction heating coil requires considering multiple factors. Firstly, it is necessary to consider the shape, size, and material of the object to be heated. The shape and size of the coil should match those of the object to be heated to ensure a uniform magnetic field distribution and good heating effect. Secondly, the heating power and frequency need to be taken into account, as different powers and frequencies are suitable for different heating requirements. In addition, the material and manufacturing process of the coil also need to be considered to ensure that the coil has good electrical conductivity and mechanical strength.
Why is high-frequency induction heating suitable for situations with high requirements for production efficiency?
High-frequency induction heating is extremely fast. It can heat the surface of the workpiece to the required temperature within an extremely short period. For the heating treatment of a large number of small workpieces, it can be completed in a short time, greatly improving production efficiency. For example, in the surface quenching process of electronic components, the use of high-frequency induction heating can achieve a processing speed of multiple workpieces per second. In contrast, low-frequency or medium-frequency induction heating is relatively slow and is suitable for situations where the requirements for production efficiency are not particularly high, but the requirements for heating uniformity and depth are relatively high.
How can we ensure the heating uniformity by selecting the frequency?
Through the reasonable design of the induction coil, low-frequency or medium-frequency induction heating can make the magnetic field distribute evenly for large-sized workpieces with simple shapes, thus achieving the overall heating uniformity. However, for workpieces with complex shapes, medium-frequency or high-frequency induction heating has more advantages. By adjusting the shape, number of turns, and position of the induction coil, as well as adopting methods such as multi-turn coils and segmented heating, medium-frequency or high-frequency induction heating can better adapt to the shape of the workpiece, making the magnetic field distribution more uniform, and thereby ensuring the heating uniformity. For example, for a workpiece with grooves, using high-frequency induction heating and designing a special induction coil can enable the grooves to be heated evenly as well.
What advantages does multi-frequency induction heating have compared with single-frequency induction heating?
Multi-frequency induction heating has the following advantages. Firstly, it can control the heating depth and temperature distribution more precisely. For different parts of the workpiece or different heating stages, an appropriate frequency combination can be selected to achieve the desired heating effect. In contrast, single-frequency induction heating is relatively poor in the flexibility of heating depth and temperature control. Secondly, multi-frequency induction heating can improve heating efficiency. For some workpieces that require simultaneous heating of both the surface and the interior, a multi-frequency combination can reach the required temperature in a shorter time, reducing heating time and energy consumption. In addition, multi-frequency induction heating can also improve the heating uniformity of the workpiece. Especially for workpieces with complex shapes or non-uniform materials, magnetic fields of different frequencies can complement each other, making the overall heating of the workpiece more uniform and reducing the phenomena of local overheating or underheating. This is a problem that single-frequency induction heating can hardly overcome completely.