Nov
07
2007
IngenierÃa
Rapid shell build for investment casting: revolutionizing an ancient process
S Jones, C Yuan and S Blackburn
IRC in Materials Processing, University of Birmingham, UK.
67th World Foundry Congress
Investment casting is a time-consuming, labour intensive process, which
can produce complex, high value-added components for a variety of
specialised industries. Drying and strength-development of each coat
during shell mould production is the most significant rate-limiting factor in
the reduction of lead times and production costs for industry. As such,
improvements which reduce cost and cycle times, open up new
opportunities for produc...
Nov
07
2007
Moldes y machos
Dispersive mixing of natural molding sand – an optimized preparation process
M. Mueller
Maschinenfabrik Gustav Eirich GmbH & Co KG, Hardheim, Germany
67th World Foundry Congress
Natural molding sand with a grain spectrum of 0.5 to 2.0 mm is used for
aluminium casting, particularly if the surface of the castings is required to
meet high standards. But the processes of molding and aluminium casting
cause the formation of hardened agglomerates in the natural sand.
This is particularly challenging for the solids mixer, because the
agglomerates need to be disintegrated first, before all solid components
can be homoge...
Oct
30
2007
Aleaciones ligeras
A study of the structural controlling of Al-Si alloy by using electromagnetic vibration
Jung-Pyung Choi†, *Tae-Woon Nam, and Eui-Pak Yoon
Research Institute of Steel Processing & Application (RISPA) *Hanyang Univ., Ansan, Korea
67th World Foundry Congress
The structural control of Al-Si alloy, which was not studied among various
electromagnetic processing of materials, was considered applying the
alternating current and direct current magnetic flux density. The main aim
of the present study is to investigate the effects of electromagnetic
vibration on the macro and microstructure of Al-Si alloy in order to develop
a new process of structural control in Al-Si alloy. When the
electromagneti...
Oct
30
2007
Aleaciones ligeras
The effect of using bubbling and AlCuP for refining primary silicon at Al-18%Si alloy
Sang-Man Kim, Jung-Pyung Choi†, *Tae-Woon Nam, and Eui-Pak Yoon
Research Institute of Steel Processing & Application (RISPA), *Hanyang Univ., Ansan, Korea
67th World Foundry Congress
This paper investigates the effect of Bubbling and AlCuP on primary Si
size in Al-18%Si alloy. Bubbling process and AlCuP treatment are
effective for refining primary Si in hypereutectic Al-Si alloy. Both the
bubble and AlCuP can be used as nucleation sites of primary Si. Many
nucleation sites can make the size of primary Si decreased. So, this
experiment suggests that the mix using of bubbling process and AlCuP
treatment are more effect...
Oct
30
2007
IngenierÃa
Fabrication of Ni-Al intermetallic compounds on the Al casting alloy by SHS process
G.S. Cho*, K.R. Lee*, K.H. Choe*, K.W. Lee* and A. Ikenaga**
*Advanced Material R/D Center, KITECH, Korea, **Osaka Prefecture University, Japan
67th World Foundry Congress
Combustion synthesis with the advantages of time and energy savings
has been recognized as an attractive alternative to the conventional
methods. In order to improve the surface properties of Al casting
components, Ni-Al intermetallic compounds are fabricated by the
SHS(Self-propagating High temperature Synthesis) process using the
reaction heat of the elemental powders. Three kinds of nickel aluminides,
Ni3Al, NiAl and NiAl3 were produc...
