Squeeze pin implementation in a high pressure die casting

Binney, Matthew, Dargusch, Matthew, Nave, Mark and McKinney, Peter 2003, Squeeze pin implementation in a high pressure die casting, in Proceedings of the 1st International Light Metals Technology Conference, CAST, Brisbane, Qld., pp. 239-242.

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Title Squeeze pin implementation in a high pressure die casting
Author(s) Binney, Matthew
Dargusch, Matthew
Nave, Mark
McKinney, Peter
Conference name International Light Metals Technology. Conference (1st: 2003: Brisbane, Qld.)
Conference location Brisbane, Qld.
Conference dates 18-20 Sep. 2003
Title of proceedings Proceedings of the 1st International Light Metals Technology Conference
Editor(s) Dahle, Arne
Publication date 2003
Conference series International Light Metals Technology Conference
Start page 239
End page 242
Total pages 5
Publisher CAST
Place of publication Brisbane, Qld.
Summary This paper discusses the implementation of hydraulically operated squeeze pins to reduce porosity formation in cast aluminium bearing caps. Two complete sets are cast in an eight-cavity die with a 2000t cold chamber high pressure die casting machine. The initial die configuration used a sliding core assembly with stationary pins to core a through hole in a thick section of the front cam caps. This configuration resulted in high post machining scrap rates, primarily due to porosity associated with solidification shrinkage. Replacement of the sliding core assembly with a squeeze pin unit substantially reduced shrinkage porosity in the critical region, with consequent reductions in the scrap rate. The squeeze pins are actuated 1.5s after the piston reaches the high shot changeover position, but can be successfully engaged between I and 3.5 seconds after high shot changeover. Density measurements and visual inspection confirmed the substantial improvement in porosity levels in the critical region of the castings.
ISBN 0975132903
Language eng
Field of Research 091207 Metals and Alloy Materials
HERDC Research category E1 Full written paper - refereed
Copyright notice ©2003, CAST
Persistent URL http://hdl.handle.net/10536/DRO/DU:30009600

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