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With criteria of the highest quality

Technical perfection, achieving high quality standards and use of top manufacturing equipment are just three aspects of manufacturing aluminium extruded products. Through constant development and cooperation with casting experts, special alloys are developed jointly with our customers, allowing for above-standard mechanical properties. At the same time, we recently managed to further increase the quality of the manufacturing equipment and the production volume. This enables us to takes large orders by renowned customers in the automotive, aircraft and space industry and to provide short delivery periods.


Extrusion, drawing and heat treatment procedures

We carry out various manufacturing processes depending on the intended use. Hot extrusion is a process during which the heated material (log) is heated to a temperature about 10 °C below the solidus temperature. The material applied for extrusion is 100 % automatically controlled by means of an ultrasonic device that facilitates ultrasonic control of billets in compliance with the AMS-MIL-STD-2154, Class B and A, and ASTM B594, Class B and A, standards. Logs are extruded by means of a hydraulic extrusion press through a steel matrix. The dimensions and shape of the product depend on the shape of the matrix aperture. Extrusion is conducted by means of two procedures, namely direct and indirect extrusion. The procedure sees the application of various instruments (matrices) that may be either flat or contain a pre-chamber, which applies to rods in particular, whereas hollow profiles and sections see the application of porthole dies, by means of which seamed products are extruded. Seamless products (tubes and pipes) are extruded by means of a mandrel.

The rod, tube and pipe, profile and section manufacturing process encompasses operations that facilitate the manufacturing of high-quality, heat-treated products: homogenisation and grinding, heating and pressing on state-of-the-art presses, cold and hot working and strengthening and cutting to length.

The manufacturing process includes various direct extrusion presses whose rated output amounts to 12 to 55 MN and one indirect extrusion press whose rated output amounts to 35 MN. The following dimensions can be extruded: 8 to 180 mm for rods and maximum 320 mm for profiles and sections with a circumscribed about circle.

Cold working (drawing) of products takes place on standard drawing machines and continuous drawing lines (drawing, straightening, cutting to length). Impol manufactures extruded and drawn rods, tubes and pipes, profiles and sections in all standard dimensions in compliance with international standards.

Special attention is paid to stress-free states of materials, to free-cutting alloys (machining) and to forging rods. At the request of the customer, products can be 100% ultrasonic controlled after the manufacturing process has been completed.


Alloy groups

The aforementioned products are manufactured from alloys divided into two groups: free-cutting alloys and groups of other aluminium alloys.

 

Tables of properties:

 

FREE-CUTTING ALLOYS
ALUMINIUM ALLOY GROUPS

 

Products are manufactured according to their intended use by means of extrusion, drawing and heat treatment. The aforementioned standards apply to these treatment methods as well. Products can also be provided in compliance with other standards or as agreed with the customer.