Curved aluminum profiles

Aluminum profiles are not only pressed, but curved.

GOST R 55411-2013

Fresh GOST 55411-2013 "Roll-formed profiles of aluminum and aluminum alloys" defines the technical requirements and conditions, associated with the production and delivery of such profiles:

  • grades of aluminum and aluminum alloys, from which bent profiles are made;
  • the state of supply of these grades of aluminum and aluminum alloys;
  • minimum and maximum wall thickness of bent profiles;
  • limit deviations of bent profiles according to:
    – wall thickness,
    – corner bending,
    – twist angle,
    – straightness,
    – measured length.

Aluminum grades and aluminum alloys

Rolled aluminum strip of various thicknesses from various grades of aluminum and aluminum alloys serves as the initial blank for the manufacture of bent aluminum profiles:

  • aluminum grades AD0 and AD1,
  • "Dural" alloys D1, D16 and VD1;
  • aluminum-manganese alloy AMts;
  • aluminum-magnesium alloys AMg2, AMg3 and AMg6.

States of grades of aluminum and aluminum alloys

Roll-formed profiles are made and supplied from:

  • aluminum grades AD0 and AD1 in a state
    – M (annealed);
  • aluminum alloys D1, D16, AMg3, AMg6 and VD1 are able to
    – M (annealed);
  • aluminum-manganese alloy AMts in the states:
    – M (annealed);
    – H2 (semi-standardized);
    – H (cold-worked);
  • aluminum-magnesium alloy AMg2 in states:
    – M (annealed);
    – H1 (quarter-hardened);
    – H2 (semi-standardized);
    – H3 (three-quarter cut);
    – H (cold-worked).

Range and limit deviations

Curved aluminum profiles are made with a wall thickness of 0,5 by 3 mm. Profiles from alloy AMg2 in states M and H1 are made with wall thickness 0,25 and 0,3 mm.

Maximum deviations in wall thickness meet the requirements of standards for the supply of aluminum strips.

With an increase in the thickness of the profiles, the maximum deviations of the bending angle of the profiles decrease and are:

  • ± 7 ° – for profiles with wall thickness from 0,25 by 0,4 mm;
  • ± 5 ° – for profiles with wall thickness from 0,4 by 0,9 mm;
  • ± 3 ° – for profiles with wall thickness from 0,9 by 3,0 mm.

Curved aluminum profiles are supplied in lengths from 1 by 6 m.

The limiting angle of twisting of bent aluminum profiles also depends on their thickness:

  • ± 7 ° – for profiles with wall thickness from 0,25 by 0,4 mm;
  • ± 5 ° – for profiles with wall thickness from 0,4 by 0,9 mm;
  • ± 3 ° – for profiles with wall thickness from 0,9 by 3,0 mm.

Straightness limit deviation: no more 5 mm 1 m. Smooth undulation with wave height 0,5 mm allowed in any quantity.

Aluminum profiles: bent or extruded?

Curved aluminum profiles are used there, where the following differences between extruded profiles are acceptable:

  • simpler cross-sectional shape;
  • a limited number of aluminum alloys;
  • wider dimensional and shape tolerances;
  • reduced requirements for surface quality;
  • lower price.

Roll forming mill

Roll-formed profiles - and aluminum, and steel - made on special roll-forming units - roll-forming lines. The process of manufacturing roll-formed profiles is called profiling.. Profiling is a metal processing process, in which a sheet metal workpiece is gradually formed as a result of a series of bending operations into a bent profile. This process takes place on a roll forming line - roll forming mill, where the blank passes through several roll stands. These rolls, which sometimes look like rollers, can be located above and below the workpiece, along its edges, at an angle to her and so on. As the sheet passes through each roll stand, it undergoes plastic deformation and bending.. Each roll stand takes one step out of the complete bending sequence to form a finished rollform.

profilnyy-stanFigure - Roll Forming Mill (Source: custompartnet.com)

Profiling technology

Rolls are lubricated, to reduce friction between rolls and belt and, thus, reduce roll wear. Moreover, lubrication enables a higher profile forming speed to increase the productivity of the roll forming unit. Performance also depends on the material - grade of aluminum and aluminum alloys, the thickness of the original aluminum strip, number of roll stands and bending radii of each bend. Roll forming units may include additional technological operations, such as , perforation, nails or averages.

The profiling process is used to form metal strip profiles with a wide variety of cross-sections.. The most common are solid profiles (profiles without cavities), however hollow profiles, for example, tubes, also quite successfully made by this method.

Application of roll-formed profiles

Curved aluminum profiles are used in industrial and residential construction, electric lighting, warehousing and other areas.