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Effect of equal channel angular extrusion on chip surface roughness of solid regenerated 6061 aluminum alloy

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Document pages: 11 pages

Abstract: Solid state recovery by hot extrusion is a promising technology to recover processing chips without remelting. In addition, equal channel angular extrusion (ECAP) technology was combined with extrusion of recycled blank to improve the mechanical properties of recycled samples. The surface roughness of solid recycled 6061 aluminum alloy turning chips is studied in this paper. Aluminum chips were cold extruded and hot extruded at an extrusion temperature (ET) of 425 ° C and an extrusion ratio (ER) of 5.2. In order to improve the performance of extruded samples, ECAP was performed on aluminum chips at room temperature for up to three times with an ECAP die with a channel die angle of 90 °. The surface roughness (and) of the recycled billet machined by turning isestigated. Box-Behnken experimental design was used to investigate the effect of three machining parameters (cutting speed, feed rate, and depth of cut) on the surface roughness of the machined specimens for four materials conditions, namely, extruded billet and postextrusion ECAP processed billets to one, two, and three passes. Quadratic models were developed to relate the machining parameters to surface roughness, and a multiobjective optimization scheme was conducted to maximize material removal rate while maintaining the roughness below a preset practical value.

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