Cold stretching
Cold stretching or stretching (formerly cold shrinking) is a technical process for firmly connecting two components, in which the property of thermal expansion is used.
The method is e.g. B. used in vehicle and railway technology to produce two components, e.g. B. shaft and ring to be firmly connected to each other. This is done by pushing the outer part onto the inner, cooled part. Liquid nitrogen and dry ice are mainly suitable for cooling . When the inner part is heated to room temperature, it expands, as a result of which both parts press against one another and connect firmly to one another. Precondition is an exact production of the two parts, since the expansion is only in the range of fractions of a millimeter. A similar process is shrink-fitting , in which the outer part is heated.
literature
- Franz X. Eder (Ed.): Low temperature technology . VDI-Verlag, Düsseldorf 1981. ISBN 3-18-400503-8 .