Jul
30
2007
Aleaciones ligeras
Squeeze casting of aluminum alloy safety critical components for automotive applications
Rathindra DasGupta*, Chuck Barnes*, Peter Radcliffe** & Paul Dodd**
* SPX Contech, USA, ** SPX Contech, UK
67th World Foundry Congress
Squeeze casting is considered a “high integrity” process, and has given
materials and design engineers a new alternative to conventional casting
techniques: gravity permanent mold (GPM) and conventional (high
pressure, high velocity) die-casting. In recent years, the squeeze casting
process has been applied to near net shape products requiring high
impact strength, high fatigue strength, pressure tightness, or high wear
r...
Jul
30
2007
Metodos de moldeo y materiales
Mathematical modeling of compacting process of greensand moulding
Li Wenzhen, Zhou Kelin, Wu Junjiao.
Department of Mechanical Engineering, Tsinghua University, Beijing
67th World Foundry Congress
Green sand molding has ever been playing an important role in modern
foundry, especially in the casting production of automobile parts. The aim
for a modern green sand molding requires the even distribution of mold
hardness with expected mold strength. For loose green sand, several
nonlinear problems must be met, including molding materials, molding
process and mold geometry. In order to improve the efficiency of
calculation, especially ...
Jul
26
2007
Metodos de moldeo y materiales
Thermochemistry and kinetics of iron melt treatment
Simon N. Lekakh*, David G. C. Robertson* and Carl R. Loper Jr. **
*University of Missouri–Rolla, **University of Wisconsin-Milwaukee, U.S.A.
67th World Foundry Congress
Nodulization for producing spherical graphite in ductile iron (DI) and
inoculation for increasing graphite nodule count are the result of chemical
reactions of the additives with the melt. The multi-component equilibria
and the kinetics of additive dissolution in the melt were computed and
studied experimentally. Measurements of the oxygen activity confirmed
the calculated features of the refining reactions. Possible reaction paths
were ...
Jul
26
2007
Aleaciones ligeras
Surface tension and Viscosity of Mg alloys
Soo-han Park and Bo-young Hur
Gyeongsang National University, S Korea
67th World Foundry Congress
The rheological characteristics are the most important factors in casting
process and metallic foam manufacturing especially. The surface tension
(by the ring method) and the viscosity (by the rotation method) of molten
Mg alloys (AZ91 and AM60) have been measured under pure Ar or SF6
+CO2 atmosphere. The surface tension and the viscosity of Mg alloys were
investigated in the temperature range of 600-850oC, and the effects of the
additio...
Jul
26
2007
IngenierÃa
New Engineering and Standards Developments in Austempered Ductile Iron (ADI)
Kathy L. Hayrynen, PhD*, John R. Keough, PEng*, Arron Rimmer, PhD**.
* Applied Process Inc.- Livonia, Michigan, USA; **ADI Treatments Ltd., Birmingham, UK
67th World Foundry Congress
Austempered Ductile Iron (ADI) has only a 30 year commercial history,
making it one of the younger engineering materials currently deployed.
New theoretical and applied research has revealed important property and
material behavior information that is useful to the metallurgist, the
machinist and the design engineer. Work on wear resistance,
machinability, Carbidic and ferritic hybrids, environmental effects, gear
design and other invest...
