EXTRUSION OF ALUMINUM ALLOYS THROUGH A WATER-COOLED DIE (PRESSOVANIIE ALYUMINNEVYKH SPLAVOV CHEREZ
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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A method of extruding aluminum alloy through a water-cooled die was developed and introduced in industry. Production-scale tests were carried out in a 1500-ton press equipped with a water-cooled die through which D16 and AMg6 aluminum-alloy tubes, 33-53 mm in outside diameter with a wall thickness of 3-10 mm, were extruded from 156 mm x 64 mm x 340 mm ingots. It was established that the use of a water-cooled die made it possible to increase the extrusion rate from 2.56-3.3 mmin to 3.6-5.0 mmin without a significant increase of extrusion force. The water flow should not start until 0.5-1.2 mm of the tube has cleared the die, and then the water should be fed in cycles. The cooling has no negative effect on structure, mechanical properties and corrosion resistance of either extruded or extruded and cold-rolled tubes. The surface quality of tubes extruded through the water-cooled die is somewhat better than that of conventionally extruded tubes because the metal does not stick to the die.
- Metallurgy and Metallography
- Fabrication Metallurgy