Индукциони грејачи за подршку раду у радионици

Induction heaters to support the work of the workshop

DACPOL company offers a range of induction heaters are designed to support the work of the workshop.

Induction heating is a contact-free method that can be used to heat metals. The induction heater creates an alternating magnetic field that generates eddy currents inside the material. It is these eddy currents that generate the heat. In our machines, the alternating current is “pumped” backwards and forwards in the inductor at between 15-20 kHz.

Three factors that influence heating

With induction, there is much talk about the induction heater’s power. But the power is only one of three important parameters. The other two are the surface across which the power is produced and the frequency. The power per unit area is a very important ratio where the inductor itself is completely crucial for achieving a high power density. In this area, Alesco are world leaders.

The last factor, the frequency, is always a compromise. In principle, the lower the frequency, the deeper the magnetic penetration into the material. In other words, at low frequencies the heat is generated deeper inside the material. So induction heaters with higher frequencies heat up the surface more. This can be seen with the naked eye, but since it is only surface heat one sees, it can be difficult to judge the depth of heat penetration. Alesco’s 3-phase models work in the frequency range 15-18 kHz.

The art of undoing a screwed joint

In a vehicle workshop, induction heaters are used for straightening frames and axles and even for releasing screwed joints, which is actually the greatest area of use. A modern screwed joint in today’s vehicles can be difficult to undo. It is a precision part where the tolerances in the threads are minimal and often comprise several different qualities of metal. In addition, it often consists of a mix of different materials such as rubber, different types of adhesives, etc. Many screws fitted to vehicles are pre-torqued by the manufacturer. In other words, there are both pre-torqued and non pre-torqued joints in a vehicle. The designer of the joint has determined which of them are placed where. In addition to this, over time different types of corrosion occur between the parts of the joint. All these things together influence the demand for torque and even the ability to separate the joint at all. An induction heater simplifies this situation considerably.

Induction heating is fast and gentle

Releasing a joint with induction differs somewhat from using an open flame. With an open flame, one heats the outer surface of the joint causing it to expand. With induction, an immediate difference in temperature is created between the various parts of the joint, causing movement and "breaking" the joint. This means that one can just heat up the screw to achieve a "movement" which in turn reduces the torque necessary to release the joint.
There are many other different areas of use for an induction heater. One can for example release glued parts such as windows, decals, rubber strips, etc. Gluing is something that occurs more and more often in modern vehicles, which creates even more future areas of use for induction heaters.

Induction heaters type A 80

Induction heaters type A 800

Induction heaters type A 1200

Induction heaters type 4000

Typical applications