ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In the present case study, finite element (FE) simulation was performed to evaluate thedesign of a spreading pocket die by analysing the metal flow during the extrusion of the 6061 alloy toproduce a thin-walled wide profile for ground transportation applications. The results obtained fromthe FE simulation were in good agreement with those from industrial extrusion trials. The velocityand temperature non-uniformities on the profile cross section, revealed from the FE simulation,suggested the die bearing area for die correction. The FE simulation also showed that ram speed hadlittle influence on the velocity non-uniformity but a marked effect on the temperature and temperaturedistribution of the profile. In the case of extrusion through the spreading pocket die, more heatdissipation from the hotter billet to the die took place, especially when ram speed was low. Therefore,to reach a temperature sufficient for the dissolution of Mg and Si, ram speed must be raised. The FEsimulation in the transient state of the extrusion process could give an indicative ram speed for trialextrusion to reach a sufficiently high temperature for the solution treatment on the one hand and toavoid hot shortness on the other hand. It also showed that ram speed had a moderate effect on thebreakthrough pressure. Therefore, in the selection of ram speed, attention should be paid to its effecton the maximum profile temperature and temperature distribution
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.367.63.pdf
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