Aluminum extrusion

Now, let’s talk about the extrusion process, a process by which 99% of our profiles are made to manufacture our standard products for HVAC and Architecture.

Extrusion is a forming process by plastic deformation, which consists of molding a metal, hot or cold, by compression in a container sealed at one end with a die or row that has an orifice with the approximate dimensions of the desired product, and at the other end, it has a solid disk, called pressure disk.

If the compressive stress is transmitted to the metal through the pressure disc or die, the extrusion process is called direct extrusion or reverse extrusion.

EXTRUDABILITY OF ALUMINUM ALLOYS

The ease or difficulty of extruding a profile, which ultimately determines its price, is based on the studies that have allowed the following table:

The ease or difficulty of obtaining profiles from complex sections can be deduced from the previous table.

Alloys with a high extrudability index that are very soft and cannot be hardened by heat treatment would cause the resulting profiles to deform during handling and will not maintain the shapes of the design.

In hard alloys, their low extrudability means that aluminum does not flow well and, therefore, complex-section profiles cannot be made. In addition to its low productivity, this type of alloy requires temple heat treatments and maturation with a very strict control, which implies that simple-section profiles are more expensive.

TYPES OF MATRICES BY PROFILE

  • Hollow profile:

  • Solid profile:

All plastic deformation aluminum alloys are susceptible to accepting of extrusion and their use allows covering numerous sectors and solving different problems as those that arise in decoration, mechanical construction, resistance to corrosion and chemical agents, etc.

From the extrusion point of view, three classes of alloys are distinguished:

  • Soft Alloys, loaded with a few alloy elements:
  • Not heat treatable:
  • Pure Aluminum: series 1000
  • Aluminum – Magnesium: series 3000
  • Heat treatable:
  • Aluminum – Magnesium – Silicon: series 6000

 

  • Medium Hard Alloys:
  • Not heat treatable:
  • Aluminum – Magnesium (3%): series 5000
  • Heat treatable:
  • Aluminum – Zinc: series 7000

 

  • Hard Alloys:
  • Not heat treatable:
  • Aluminum – Magnesium (3.5%): series 5080
  • Heat treatable:
  • Aluminum – Copper – Magnesium: series 2000
  • Aluminum – Copper – Magnesium – Copper: series 7040

 

PROFILE LENGTH

First off, the practical limits of the profile length depend on the transport, although technically they can be made longer, we must wonder how would we transport them?

In general, the length will also depend on the size of the treatment furnace for artificial maturation.

Currently, the standard profile length used by our company ranges from 5,850 to 6,000 mm. The profile thickness depends on the usage and application of each product, which could be either for the air-conditioning sector or the construction sector in products for ventilation.

 

Article:

Ing. Luis Felipe Trejos T. – Director of Operations

Laminaire S.A.S

 

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