Design and analysis of optimal die profile for the extrusion of round SiC DRMM Al 6061 composite billet into hexagonal section
Journal of the Brazilian Society of Mechanical Sciences and Engineering - Tập 37 - Trang 1687-1700 - 2014
Tóm tắt
Aluminium based matrix composites with silicon carbide as particle reinforcement called discontinuous reinforced metal matrix composites (DRMMs) have excellent mechanical properties like high yield strength, resistance to wear and vibration resistance. But during the development of DRMM composites, compression process like extrusion is an advisable secondary process for homogenous structure. This research work investigates the metal flow behaviour of Al–SiC based DRMM composite through six different die profiles namely third-order polynomial, fourth-order polynomial, cosine, elliptical, hyperbolic and conical geometry. Extrusion load, stress and strain distribution, and metal flow for above said die profiles are predicted using analytical approach upper bound technique and numerical technique finite element method. Cosine and third order polynomial profiles are found to be most optimal in terms of homogenous and less extrusion load requirement. To validate the results, specially made Al–SiC composite through stir casting route was extruded from round to hexagon through an exclusively fabricated cosine die. Results observed from the experiment have good agreement with both analytical and numerical methods.
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