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Evisto®, a way to produce ultra-thin gravity die castings

Published online by Cambridge University Press:  13 February 2013

D. Tomasevic ,
Y. Longa ,
A. Da Silva ,
F. Molle ,
T. Carnevale ,
C. Bruyas  and
M. Suéry
D. Tomasevic
Affiliation:
CTIF, 44 avenue de la Division Leclerc, 92310 Sèvres, France
Y. Longa
Affiliation:
CTIF, 44 avenue de la Division Leclerc, 92310 Sèvres, France
A. Da Silva
Affiliation:
CTIF, 44 avenue de la Division Leclerc, 92310 Sèvres, France
F. Molle
Affiliation:
AB Fonderie, 75 rue Jules Guesde, 69230 Saint-Genis Laval, France
T. Carnevale
Affiliation:
AB Fonderie, 75 rue Jules Guesde, 69230 Saint-Genis Laval, France
C. Bruyas
Affiliation:
Grupo Antolin, Boulevard Blaise Pascal, 42230 Roche la Molière, France
M. Suéry
Affiliation:
Laboratoire des Matériaux et du Génie Physique (LMGP), Grenoble INP-Minatec, 3 parvis Louis Néel, CS 50257, 38016 Grenoble Cedex 1, France
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Abstract

The massive use of air gaps in tooling, per the Evisto® concept, can confine the heatcontributed by the cast alloy in a small volume. The resulting high die wall temperaturesare turned to account to cast parts having ultra-thin walls, of the order of onemillimetre thick. Effective thermal insulation limits thermal exchanges to slow thecooling of a cast alloy. The property that best characterizes this effectiveness is thereciprocal of thermal conductivity, thermal resistance. Air was chosen as the insulatingmaterial because of its many advantages: very favourable thermal conductivity, limitedapplication cost, and zero purchase cost. Evisto®, an innovative tooling design, hasbeen used to produce plates 1 mm thick measuring 130 by 200 mm and automobile seat backs1.2 mm thick measuring 390 by 576 mm. The mechanical properties of the castings soproduced complied with standard EN 1706 of May 2010 for aluminium alloy castings. A patentapplication was filed for the Evisto®concept in August 2010.

Keywords

Gravity die castingaluminium alloyweight reductionthermal insulation
Type
Research Article
Information
Metallurgical Research & Technology , Volume 110 , Issue 2 , 2013 , pp. 131 - 146
Copyright
© EDP Sciences 2013

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References

Tomasevic, D., Longa, Y., Dracon, J.-M., Beaubras, J., Fonderie, Fondeur d’Aujourd’hui 260 (2006)
Tomasevic, D., Longa, Y., Derrien, J.-P., Fonderie, Fondeur d’Aujourd’hui 268 (2007)