Sheet metal folding is permanent deformation with bending power.

During sheet metal forming operations, problems such as tearing, necking, wrinkling and back spring can occur. These problems make the sheet metal useless. For successful forming, the formalizing must be uniform, the high level degree of deformation must be achieved without damage, the shape of the part must be the same, and the surface must be smooth when removed from the mold.

Formability of metals is the ability to get the desired shape without damage during shaping of the sheet.

Formability of metals depend materials features and process parameter.