The Nitriding of extrusion dies is a necessary process in order to achieve the hardness levels necessary for the die bearings to withstand the high temperature and abrasion which occure inside the die during Aluminium extrusion. Without nitriding, the die bearings will wear out very quickly and therefore die life will be very short. In addition, the nitrided layer creates a lubricated film which r...
Read MoreManaging the process in the caustic soda line is a very demanding task in many extrusion plants. Aside for the containment of leaks and fumes, the main problem is how to keep the amount of used soda effluent to the minimum possible. The evacuation of used soda is an expensive service in most places and therefore, the volumes should hopefully be no larger than the volume of new soda solution that's...
Read MoreCalculations show that applying liquid nitrogen at the die exit via channels in the die or the backer can generate a cooling effect on the extrudate of approx. 55 ÷ 60°C ( 131 ÷ 140°F). This is a considerable cooling effect compared with the application of "gasous nitrogen" which only yields a cooling effect of 15 ÷ 20 °C in the best case. The superior cooling effect is achieved through t...
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