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Curling is a sheet metal forming process used to form the edges into a hollow ring. Curling can be performed to eliminate sharp edges and increase the moment of inertia near the curled end.[1] Other parts are curled to perform their primary function, such as door hinges.
- ^ Boljanovic, Vukota (2004), Sheet metal forming processes and die design, Industrial Press, p. 55, ISBN 978-0-8311-3182-1