Effects of Process Conditions on Die Pick-Up Formed during Extrusion of Aluminum Alloy AA6060
R. Peris, Z. W. Chen, and T. Pasang, AUT University, Auckland, New Zealand
C. Hand, S. Chen, B. Hayward and J. Mainwaring, Fletcher Aluminium, Auckland, New Zealand
Track: EXTRUSION/DIE, PRACTICAL - Recovery Improvement
ABSTRACT --- How extrusion conditions affect die pick-up has not been fully
understood and explained in literature. In this study, the effects of extrusion speed
and exit temperature on the degree of die pick-up during extrusion of AA6060 were
investigated. The commonly known effect called die pick-up occurred regardless of
the extrusion conditions used, and the amount of the die pick-up was found to be
independent of the extrusion conditions used. Examination of die pick-ups showed
features of local mechanical tear; based on this, it is proposed that die/extrudate
interaction caused the formation of the defect is proposed. Two further surface
defects were observed when higher than normal extrusion speed, for example, 45
meters per minute (m/min). Analysis reveals the nature of these defects, which
also will be presented.
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