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Induction heating for manufacturing industry



Induction heating is used in many industrial applications. One of them is shrink-fitting of two parts where it is used to transfer torque between the two.

In this case it is crucial to know what power must be generated by the inductors (which works the same way does an induction hob in cooking appliances).

Results and information extracted

The induced current in the part will dissipate heat, and this heated part will then expand until its diameter is large enough to cut the electrical power in the inductors and process to shrink-fit the part with the shaft or rotating part while it cools back to ambient temperature.

The multiphysics simulation of electromagnetics, heat transfer and structural mechanics is of great help to ensure the right power is used in the inductor in order to reach the targeted expansion.

Electromagnetic field of inductive heating

The image shown is the magnetic field created by the coils (blue streamlines) and the induced current in the part to heat (with colours from green for no current to red for the highest current, just under the coils).

Increase of temperature and thermal stresses in the expanded part

The animation shows the temperature variation against time on the deformed part (maximum temperature corresponds to light yellow colour and the real deformation is scaled in order to see its shape).
The part has been cut through a sector for visualisation purpose.

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