Dajcor Aluminum

Aluminum Terms & Glossary

angularity

conformity to or deviation from, specified angular dimensions in the cross section of a shape or bar

anodised aluminum

metal with an anodic layer, produced by an electrolytic oxidation process in which a metal surface layer is converted to an oxide layer having protective, decorative or functional properties

architectural anodising aluminum

anodising to produce an architectural finish to be used in permanent, exterior and static situations where both appearance and long life are important

bright anodised aluminum

anodised metal with a high specular reflectance as the primary characteristic

brushing

mechanical roughening of a surface, typically with rotating brushes

buffing

mechanical finishing operation in which fine abrasives are applied to a metal surface by rotating fabric wheels for the purpose of developing a lustrous finish

chemical brightening

chemical treatment to improve the reflectivity of a surface

chemical polishing

polishing of a metal surface by immersion in a solution of chemical reagents

clear anodised aluminum

metal with a substantially colourless, translucent anodic oxidation finish

cold sealing

sealing at temperatures significantly below 100°C, but higher than room temperature

colour anodised aluminum

anodised metal coloured either during anodising or by subsequent colouring processes

concavity

inward curvature across the width of a flat product

concentricity

the extent to which the inner and outer walls of round tube have a common centre of curvature

container

hollow cylinder in an extrusion press from which the billet is extruded

convexity

outward curvature across the width of a flat product

corner

convex junction between two surfaces

crown

difference in thickness between one of the edges and the centre of a rolled product

dyed anodised aluminum

metal with an anodic oxidation layer coloured by absorption of dye-stuff or pigments into the pore structure

eccentricity

deviation between the centres of curvature of the inner and outer walls of round tube

electrolytically colour anodised aluminum

metal with an anodic oxidation layer that has been coloured by the electrolytic deposition of a metal or metal oxide into the pore structure

extrusion butt

that portion of an extrusion billet that is left unextruded

extrusion die

block of steel having one or more holes of the required contour through which a billet is forced

extrusion press

machine consisting essentially of a container, a ram or other pressure-applying device, and a die, used for extrusion

extrusion press solution heat treatment

heating an alloy to a suitable temperature then extruding, while holding for sufficient time to allow one or more soluble constituents to enter into solid solution, where they are retained in a supersaturated state after quenching

extrusion process

process in which a billet in a container is forced under pressure through an aperture of a die

extrusion ratio

the ratio of the cross-sectional area of the extrusion container to that of the extruded product

extrusion seam

region in an extruded product where metal has been welded together in the extrusion die because of high pressure and elevated temperature

fillet

concave junction between two surfaces

finish

the characteristics of the surface of a product

flatness

the extent to which the surface of a product approaches a plane

furnace solution heat treatment

heating an alloy to a suitable temperature in a furnace and holding for a sufficient time to allow one or more soluble constituents to enter into solid solution, where they are retained in a supersaturated state after quenching

hard anodised aluminum

anodised metal on which the anodic oxidation finish has been produced with wear and/or abrasion resistance as the primary characteristic

longitudinal extrusion seam

extrusion seam in a hollow profile or a tube, parallel to the extrusion direction, which has been formed after creating two or more streams of metal and rejoining them around the mandrel of a porthole or bridge die

matte finish

diffuse finish typically produced by rolling, etching, brushing or blast cleaning

mechanical polishing

polishing with a flexible rotating mop carrying an abrasive compound

mill finish

finish, naturally occurring after extruding

mirror finish

finish after rolling or polishing with high specular reflectivity

natural oxide film

oxide film that forms naturally on the metal and is relatively impervious to atmospheric attack

ovality

departure of the cross-section of a round tube, rod or bar or wire from a true circle

porthole die

extrusion die that incorporates a mandrel as an integral part of the die assembly

sealing

treatment of anodised metal by hydrothermal processes carried out after anodising to close the pores of the anodic layer and to reduce the absorption capacity of the coating

shot blasting

projection of abrasive grit, e.g. sand, small particles of steel, glass, plastic beads or other materials, or a mixture of abrasive grit, water and air on a product in order to in order to obtain a roughened surface topography

solution heat treatment

heating an alloy to a suitable temperature for sufficient time to allow one or more soluble constituents to enter into solid solution, where they are retained in a supersaturated state after quenching

squareness

characteristic of having adjacent sides, planes or axes meeting at 90°

straightening

correcting operation of a drawn or extruded product, to fulfil the requirements concerning tolerances on form and dimension.

straightness

the extent to which the axis or the edge of a product approaches a straight line

tool

term typically referring to the dies, mandrels, etc., used in the production of extruded or drawn profiles or tube

transverse extrusion seam

extrusion seam which is formed when two subsequent billets are welded together in the extrusion die

tumbling

treatment of products in a rotating container in the presence of abrasives and water for deburring or to produce a variety of surface textures

twist

The extent to which a product is twisted around its longitudinal axis

visible/exposed surface

surface of the semi-finished product which is intended to be visible in final use
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