Evaluation of the Risering Requirements for the Za-27 Zinc–Base Alloy

Author: Barnhurst R. J.  

Publisher: Maney Publishing

ISSN: 0008-4433

Source: Canadian Metallurgical Quarterly, Vol.27, Iss.3, 1988-07, pp. : 205-211

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Abstract

Foundry data are presented based on experimental work conducted during gravity casting studies of zinc-aluminum (ZA) alloys. In particular, the development of feeding distance and risering data (Vr/Vc and H/D ratios) for both chilled and un chilled sand castings, produced under controlled conditions, are discussed. The study showed that feeding distance and optimum Vr/Vc ratio for ZA-27 sand castings are dependent on both casting geometry and the presence or absence of chills. The results of earlier work devoted to fluidity, underside shrinkage and directional solidification are summarized. A comparison to published data available for ferrous and nonferrous foundry alloys is also provided.