Shrink Fitting

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Shrink fitting assembly entails joining two concentric parts by using heat to slightly widen the diameter of one part (outer part) so the other piece can be slipped in when hot and the assembly is cohesive when it cools down. The technique requires closely controlling machining tolerances on the parts and perfectly accurate heating (uniform and following the temperature buildups). 

Induction heating is particularly suited for this precision process because it can accurately localize the heat on a specific point and once the pieces are glided together the fit is instant and precise.

Therefore, the "support" (outer part) is expanded before being threaded onto the inner component to be shrink fit.

The induction shrink fitting technique is commonly used for the following processes:

• Fitting in gear wheels (pinions on shafts, etc.)

• Covers for refrigerant compressors

• Morse tapers for machine-tools 

• Rotating parts for turbines.

Fives meets the specifications of all types of technologically advanced segments of the aerospace industry with processes that guarantee shrink fitting precision and do not contaminate inner surfaces, especially when assembling fragile parts.

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