With shrink fitting of mechanical precision processings we refer to the operation of union/assembly of two complementary components, with the aim to define an interlocking connection; usually, when talking about shrink fitting, it refers to shafts and joining elements and gears, for example a shaft with its nut or screw, or with rolls and shells.
There are two types of shrink fitting, hot and cold, depending on the temperature at which the process takes place.
Heat shrinking is used when the thermal expansion of the joint position is necessary, to perform the coupling and overcome the dimensional interference of the components; the expansion occurs in a uniform way, thus avoiding colder areas that would prevent or impair stable coupling.
Essential is, therefore, an accurate control of the temperature, which will change depending on the geometry, size and weight, and the materials of the two components, as too elevated temperatures could lead to a structural change of the components.
During this type of procedure, the client is always invited to attend, providing drawings for the assembly of the complete group and the interferences.
Cold shrink fitting, or cryogenic shrinking, usually occurs at about -196 °C, by immersing the pieces to be processed in liquid nitrogen contained in a special container; in contact with liquid nitrogen, the piece cools and contracts, while the liquid is boiling, only to calm down when the piece and liquid nitrogen reach the same temperature. This technique is used for the single or series production of parts, when shafts must be assembled with toothed wheels or levers, or when there is a need to have solid interference positions, and may concern components formed from ferrous and non-ferrous metals.
In these procedures, the geometries and the structure of the component materials remain unchanged, oxidation layers are avoided, and it is a simple and fast practice, requiring low investments.
GUARANTEED PRECISION AND QUALITY
DOWNLOAD THE PDF OF OUR MACHINES
© Officine Meccaniche Zanetti | VAT nr. IT00170330245
This website uses cookies to improve your experience while you navigate through the website.
View the Cookie Policy View the Personal Data Policy
Google Maps is a maps visualization service provided by Google Ireland Limited. This service is used to incorporate content of this kind on its pages.
Personal data that are processed: Tracker; Usage Data.
Place of processing: Ireland – Privacy Policy.
Gravatar is an image visualisation service provided by Automattic Inc. that allows this Website to incorporate content of this kind on its pages.
Place of processing: United States – Privacy Policy.
Google Fonts is a service used to display font styles operated by Google Ireland Limited and serves to integrate such content into its pages.
Personal Information processed: Usage Data; Tracker
Place of processing: Ireland – Privacy Policy.
Google Analytics is a web analytics service provided by Google Ireland Limited (“Google”). Google uses the Personal Data collected to track and examine the use of this Application, compile reports on its activities and share them with other services developed by Google.
Google may use your Personal Data to contextualize and personalize ads in its advertising network.
This Google Analytics integration anonymizes your IP address. The anonymization works by shortening the IP address of the Users within the borders of the member states of the European Union or other countries that are members of the Agreement on the European Economic Area. Only in exceptional cases, the IP address will be sent to Google's servers and shortened within the United States.
Personal Data collected: Tracker; Usage Data.
Place of processing: Ireland – Privacy Policy – Opt Out.