from Billet to Profile
We place a great deal of importance on input stock that satisfies our stringent specifications. We use ultrasonically tested material and standardized alloys.
In direct extrusion, aluminum billets are preheated to 450 °C to 500 °C and pressed through a profile die at high pressure (up to 2500 tons), depending on form and dimension of the profile.
This tool in its negative shape represents the cross section of the profile. The press speed depends on the type of alloy and the complexity of the profile.
Machining (Elongation, etc.)
After the extruded profile leaves the die, it’s cooled with either air or water. To ensure perfectly straight profiles and relieve any tension, the profiles are then strained.
After that the profiles are then cut to the desired lengths and sent to the age-hardening furnaces. They are heated to just under 200 ° C for four to eight hours to achieve the desired hardness.
We can saw profiles with little creation of burr. The alloy and other properties define the right adjustment of the saw.
The profiles are then cut, milled or drilled, depending on the specifications. They are stamped in special hydraulic or eccentric presses. Special surface finishes are also available.
On demand surface treatment can also be provided. During this process, the aluminum will be put into a electrolytic bath, connected with direct current as anode. This leads to a thicker Oxidlayer on the surface of the aluminum. Before, the layer had a strength of about 0,02 ym afterwards between 5 und 25 ym according to the required product properties. During anodizing, the color can remain, but other colors can also be chosen. Powder coating provides an endless choice of color selection and very good durability.
The profiles are packaged according to type and means of transport and, depending on the client’s wishes, in reusable containers, on squared timber or pallets, in cardboard boxes or wrapped in plastic.