Aluminium Extrusions and Scrap
Extrusion is a process used to create objects of a fixed cross-sectional profile, of solid round, square or rectangular shapes, to L shapes and T shapes, tubes and many other different types. Metal is squeezed through a die of the desired cross-section using either a mechanical or hydraulic press, resulting in the finished item. The cavity in the die is lined with a wear resistant material which can withstand the pressure that is created when the metal is pushed through, making the process possible without deforming or tearing the metal.
Extrusion of aluminium is generally used in the manufacture of windows, doors and balustrades, but is also found in many other items such as vehicle parts, truck trays, boats and other marine products and refrigeration, etc to name a few.
Two advantages of this technique over other manufacturing processes are its ability to create very complex cross-sections, and being able to use materials that are brittle, because the material only encounters compressive and shear stresses. It also forms finished parts with a top-quality surface finish. Extrusions minimise the need for secondary machining. Products are not of the same dimensional accuracy or surface finish as machined parts, however, this process can produce a wide variety of cross-sections that are hard to produce cost-effectively using other methods.
Extrusion may be continuous (producing indefinitely long material), or semi-continuous (producing many pieces). The minimum thickness of steel is about 3mm, whereas aluminum and magnesium is about 1mm. The extrusion process is able to be done using hot or cold processes.
Metals that are commonly extruded:
* Aluminium is the most commonly extruded material and can be hot or cold extruded
* Brass is used to extrude corrosion free rods, automobile parts, pipe fittings, engineering parts
* Copper pipe, wire, rods, bars, tubes, and welding electrodes
* Lead and tin pipes, wire, tubes, and cable sheathing
* Magnesium is used in aircraft parts and nuclear industry parts, and is about as easily extruded as aluminum
* Zinc rods, bars, tubes, hardware components, fittings and handrails
* Steel rods and tracks -Usually plain carbon steel is extruded, but alloy steel and stainless steel can also be extruded
* Titanium is often used in aircraft components including seat tracks, engine rings, and other structural parts.
Clean Items for Recycling
The cleaner that a metal is when it is taken to a scrap metal yard to sell, the higher price it will fetch per kilo, because foreign matter is costly to clean off, so a product will always be penalised accordingly in terms of the price. By this we mean no concrete, screws, glass, paper or any other foreign material that could be attached.
The metal we purchase is processed by cleaning any non-metallic off it if required, cutting it into smaller pieces, and then it is put through a baling press to maximise container weights for export to South East Asia, where it will be melted down and manufactured into new products.