Extrusion means heating an ingot of aluminium and pressing it under high pressure through a tool with a cross-section corresponding to the finished extrusion. The speed depends on the composition of the alloy and the complexity of the pattern of the tool. The extrusions are drawn out onto a receiving table, stacked and allowed to cool. They are then tempered and cut. Any fabrication or surface finishing is then carried out.
HAP have three presses with press force from 1.200 tonnes up to 7.000 tonnes and with capacities from 80 g/m up to 30 kg/m. Extrusion width up to 520 mm.
A heated aluminium billet is pressed through a die the opening of which corresponds to the cross-section of the extrusion.
The extrusion press speed depends on the alloy and the compexity of the die´s opening.
When the extrusion leaves the press it moves onto a table where it is cooled with air or water depending on it´s size, shape, alloy and required properties.
HAP’s 7000 tonnes extrusion press is one of the biggest of its kind in Europe.