Corrugated Metals roll forming glossary helps explain the roll forming, corrugating, and metal fabricating processes.

Corrugated Metals:
Roll Forming Glossary D-F

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Double-head machines

Roll forming machines with two sets of housings and roll shafts mounted to face each other. These machines are popular in the shelving industry. These machines do not form the center of a panel effectively. See conventional machines, single-duty machines.

Drive system

The system or method used to drive the roll forming unit. The five common methods include chain drive, spur gear drive, worm gear drive, square gearing, and universal drive depending on the type of roll forming machine used.

Ductility

The ability of a material to be bent or otherwise formed without fracture. This is very critical in the roll forming process.

Elastic limit

The maximum stress that a material will stand before permanent deformation occurs. See springback.

Embossing

A process used for both decorative and functional purposes and typically performed prior to the roll forming operation. The decorative appearance is often a stucco or grained look.

End flare

End flare is the deformation at the ends of a roll formed part. End flare can be eliminated or at least reduced through using proper roll forming tool design. End flare is normally apparent after cut off and is caused by the release of residual forming stresses in material being roll formed, where one longitudinal end springs open and the other springs closed.

End joiner

A system consisting of a shear and a welder used to connect the ends of the coils permitting a continuous strip of metal to enter the roll forming machine.

Extruding

A process which shapes a piece of metal (typically nonferrous) by forcing the metal bloom, bar, or rod through a die of appropriate shape.

Ferrous metals

Metals which are iron-based. See non-ferrous metals.

Form

A bend in a material, or the actual process of bending a metalformed part.

Forming

The operation of converting a flat sheet metal workpiece into a three dimensional part.

Forming rolls

Forming rolls are the tools that form the moving material through the roll forming machine.

Functionality

A term used to describe the degree to which the designed part will perform to meet its intended purpose.

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