Analysis and modelling of a novel process for extruding curved metal alloy profiles

Abstract

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Advances and Trends in Forming Curved Extrusion Profiles

“…As decreases, it moves towards the side which has a lower extrusion velocity ( ). The theoretically predicted curvature is slightly greater than that from FE modelling and extrusion experiments [ 100 , 101 ]. This is because the effect of die land on flow velocity gradient across the die orifice is not considered due to its small length (2 mm); however, it could have an “unbending” or straightening effect on the extrudate [ 103 ], which still needs to be further considered by establishing more sophisticated model.…”

“…The specific correlation between curvature and velocity ratio and extrusion ratio can be obtained using the analytical upper-bound model and finite element analysis [ 100 , 101 ], which have been widely used in analyzing the extrusion process [ 102 ]. As shown in Figure 27 a, the extent of the work-piece flow velocity gradient across the die exit orifice, which causes curvature, has been identified.…”

“… Differential velocity sideways extrusion (DVSE) process for fabricating curved profiles [ 99 , 100 ]. Reproduced with permission from ref.…”

Homogenisation Efficiency Assessed with Microstructure Analysis and Hardness Measurements in the EN AW 2011 Aluminium Alloy

“…Al-Cu based 2xxx alloys offer high strength with low specific weight and are widely used in the form of extrusions for major structural components, particularly in the aircraft industry. However, these alloys exhibit low extrusion rates, require high extrusion pressure, and are therefore assigned a low extrudability index [1,2]. As ingots are cast, non-equilibrium solidification usually results in micro-sized eutectic phases with a relatively low melting point [3][4][5] that are likely to melt and cause irreversible damage during thermomechanical treatments at high temperatures [6].…”

Physical Modelling of the Ball-Rolling Processes

“…Sofuoglu and Gedikli [26] used plasticine in analyzing the process of forward extrusion in order to examine the influence of the parameters on extrusion force. Moreover, Zhou et al [27] used plasticine for examining a new extrusion process called differential velocity sideways extrusion (DVSE).…”