The Flanging

Flanging consists of creating, from a hole, a collar lift with or without strain hardening. These collar forming operations allow us to create revolution forms by deforming the sheet metal.

The KUCHLY company is able to implement collar forming processes through plastic deformation (or metal forming) with a whole range of techniques that allow us to transform a flat metal part into a complex or revolution shape. This type of process relies on our experience and on the metal’s ability to undergo large permanent deformations after exceeding a certain stress threshold.

The collar forming of a hole

When edge raising is performed along a closed circular or elliptical line, the resulting shape is called collar forming. This deformation can be simple or with strain hardening of the sheet metal allowing to increase the height of the created chimney. These obtained shapes can be used to create a calibrated shoulder to accommodate a screw, a probe, or a sensor. collar forming also allows for crimping, riveting, or tapping of the sheet metal without resorting to inserts.

Assembly by collar forming of a hole

The collar forming of a hole can also be used for riveting two sheets together without adding a rivet. Planning from the product design stage for a calibrated collar on the exterior with sheet metal rolling allows for the assembly of two elements without welding. Once the two parts are assembled, all that remains is to deform the end of the collar to make disassembly of these two parts impossible without destroying them.

Sheet metal collar forming

This technique of collar forming of the sheet metal edge is used in the assembly of two sheets to join them together while reinforcing the assembly. This technique consists of deforming the sheet metal by the value of its thickness to achieve perfect continuity after assembly while allowing for assembly by riveting, spot welding, or weld seams. This technique strengthens and simplifies the assembly compared to an edge-to-edge assembly technique.