Operation Method Of The Thermal Clamping Process - Garant SG1 Manual De Uso

3.4

Operation method of the thermal clamping process

Shrink fitting by inductive heating, with a high energy density, permits tool changing in a matter
of seconds.
Fig. 7: Area heated during the shrink fitting process
The induction affects a short and partial extent of the clamping area. That means that only a small mount
of energy is introduced into the chuck, and the cooling down time is correspondingly short. So as to
reduce the cooling down time still further, cooling adapter are used which make close contact around the
heated clamping area quickly conduct the heat away.
 A summary of the advantages of the thermal clamping technique:
 Quick shrink-fitting and removal
 Very high clamping forces
 Increased tool life and spindle life, because of good concentricity (< 3 μm)
 Good flexural and radial stiffness, even with large overhangs
 Slim chucks can be used even at very high speeds
 Long working life and dimensional stability of the chuck, because the heating is both local and yet
homogeneous in the clamping area
Shrink-fit chucks can be exposed to temperatures up to a limit of max. 450 °C without suffering changes to
their grain structure or concentricity. Some coloration will occur towards the front of the chuck as a result
of induction process; this has no effect on the quality and functionality of the chuck.
Although in principle it is possible to apply the shrink fitting technique to tools with shanks to DIN 6535
forms HB and HE or similar forms with recesses in the cylindrical geometry, cylindrical chucks such as those
to DIN 6535 form HA are preferable, since they permit the highest clamping forces and the least out of
balance characteristics.
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The clamping area of the chuck
heated by the specially designed induction
coil.
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A cylindrical tool is inserted into the
heated chuck, and is subjected to high radial
clamping forces when the chuck cools down.
When performed correctly, this release
and clamping process can be repeated in-
definitely. The clamping forces achieved are
higher than for other clamping techniques.
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