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Gießtechnik, Erstarrung
Dokumenten-Nummer: 57687
Buch; Hochschulschrift
Bulla, Annemarie K.
Publikationssprache: Deutsch
Messung der fest-flüssig Grenzflächenenergien in ternären Systemen
Die zentrale Zielsetzung dieser Arbeit besteht darin, eine geeignete experimentelle Methode zur Messung der
Grenzflächenenergien, insbesondere im System Al-Cu-Ag, vorzustellen und die Ergebnisse dieser Messungen zu
präsentieren.
Gießerei-Institut, RWTH Aachen, DE
Deutsche Dissertation
Erscheinungsjahr 2012 (237 S. Seiten
Gießtechnik, Erstarrung
Dokumenten-Nummer: 57710
Zeitschriftenaufsatz
Chiesa, Franco; Giguere, Nicolas; Duchesne, Bernard; Baril, Jocelyn
Publikationssprache: Englisch
Measuring mould cavity filling time in Low Pressure Permanent Mould Casting of aluminium A356
parts
Messen der Formfülldauer beim Niederdruckkokillengießen von Teilen aus der Aluminiumlegierung A356
By measuring the filling time of a thin and a bulky casting under a range of process conditions, it was possible to
determine the "slowing factor" SF, ratio of the actual filling time to the "theoretical" filling time based on the static level
equilibrium of the melt. SF allows to calculate the filling time of the mould cavity after the pressure ramp of the LPPM
process is selected. The knowledge of SF is very useful to input a realistic mould filling time when modeling the filling of
a LPPM mould. A SF value of 1 indicates that the actual filling time is equal to the theoretical time, this corresponds to
an extremely slow mould filling, when no back pressure builds up inside the mould cavity. A value of SF of 2 means that
the actual filling time is twice the time calculated based on the pressure ramp applied on the melt and the height of the
casting. It was determined that (1) In the case of the bell housing (casting thickness ranging from 6 to 25 mm, or 0.25
to 1"), at pouring temperatures between 745 and 755 deg C (1373 to 1391 deg F), SF varies from 2.26 to 1.07 when
the theoretical filling time is increased from 0.9 to 16. 5 s For a "normal" theoretical filling time of 4 s (corresponding to
an actual filling time of about 6 s), SF increases from 1.4 to 1.8 when the pouring temperature decreases from 750 to
664 deg C (1382 to 1227 deg F). (2) In the case of the thin casting (2 mm wall cover housing), SF slowly decreases
from 1.49 to 1.14 when the theoretical filling time is increased from 0.9 to 4.5 s Except for extreme pressure rises
where SF can reach 4.69 for a pouring temperature of 720 deg C (1328 deg F), the value of SF does not depend much
on the pouring temperature between 720 and 760 deg C (1328 and 1400 deg F).
Centre de Metallurgie du Quebec, CEGEP de Trois-Rivieres, QC, CA
Giessereiforschung
Erscheinungsjahr 2012
Heftnummer 2
S. S.2-8 (7 Seiten, 19 Bilder, 5 Quellen)
Giesserei Literaturschau