Aluminum

Aluminum

Industry: Metals

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Aluminum

Mechanical working

Metals; Aluminum

Subjecting metal to pressure exerted by rolls, dies, presses, or hammers to change its form or to affect its structure and its mechanical and physical properties.

Maximum speed

Metals; Aluminum

The fastest practical extrusion rate or velocity which is related to the extrusion press ram's velocity. The formula is: Max. Ram speed (ipm) x reduction ratio x 12 = maximum speed (ft/min).

Stretcher jaw mark

Metals; Aluminum

A cross hatched appearance left by jaws at the end(s) of metal that has been stretched. These marks are seen if insufficient metal has been removed after the stretching operation.

Stop mark

Metals; Aluminum

A bank-like pattern around the full perimeter of an extruded section and perpendicular to its length. A stop mark occurs whenever the extrusion process is suspended.

(1) For rolled products, an area of broken surface that is introduced after processing. The mark usually has no relationship to the rolling direction. (2) For extrusions, damage that can be imparted ...

Rub mark

Metals; Aluminum

A large number of very fine scratches or abrasions. A rub mark can occur by metal-to-metal contact, movement in handling and movement in transit.

Nitrogen shrouding

Metals; Aluminum

The process of injecting nitrogen, either liquid or gaseous, at the die openings to surround the emerging extrusion in an environment high in nitrogen and low in oxygen. This delays the formation of ...