Electromagnetic induction is the phenomenon whereby in a coil traversed by a flow of a variable magnetic field generates an electromotive force. If the coil of conductive material is part of a closed electrical circuit, on the loop passes an electric current. The value of the electromotive force is proportional to the rapidity of change of flux, and, of course, the intensity of the magnetic field. The phenomenon is, in a sense, reversible, because if you pass a variable electric current on loop it generates a variable magnetic field. That ‘s what exactly happens in the devices used in the induction hardening. On one coil, variously shaped and copper, it is made to pass an alternating current with a certain frequency of which will be discussed shortly, which produces a magnetic field rapidly variable that invests the piece that one wants to treat. In the mass of the part of the electromotive forces that are generated, and if the piece of conductive material, generate currents that circulate in the mass of the piece itself. If it is of particular in steel, and the currents are very intense, there is a rapid heating of the material by Joule effect. The induction hardening is applied for many decades in the mechanical industry because it presents a number of major advantages over the quenching performed with special ovens. The first is the biggest advantage is that the treatment can be done directly on the production line by integrating the devices in the same line. This means it is not necessary to remove the pieces from the line and transport them to another department where they are installed furnaces for heat treatment
Benefits
-Performing Operation in the same production line
-Delivery Running very short
Reduction of stocks of material circulating
– Significant reduction in the energy used
-Minori Distortions on the pieces
-Tracciabilità Of treated parts
Disadvantages
-Stroke Setup very long. Benefits only for large series.
– Need to use steels or special steels;