KNOWLEDGE development and interchange

Oct 03 2007

Moulding methods and materials
Solidification structure and mechanical properties of semi-solid processed cast iron Mohamed Ramadan, Hiroyuki Nomura and Mitsuharu Takita
Department of Materials, Physics and Energy Engineering, Nagoya University, Japan
67th World Foundry Congress
Semi-solid processing of alloys is becoming one of the key technologies for producing advanced materials. Solidification structure and mechanical properties of semi-solid processed grey cast iron(CE=3.59%) were investigated. Investigation of the resulting microstructure and mechanical properties was carried out, which revealed significant imperovements in primary pariticle size refinement and globularity in components produced through se...

Oct 03 2007

Advanced simulation techniques
Porosity criteria functions revisited J. T. Berry and R. Luck
Department of Mechanical Engineering, Mississippi State University, USA
67th World Foundry Congress
Casting modeling software for porosity minimization often results in critical parameter values, for example local values of temperature gradient, solidus velocity, solidification time, gate velocity etc. Such parameter combinations are termed criteria functions (CFs). Work by Campbell on oxide bifilms and liquid metal damage motivated the authors to re-examine experimental data accrued over fifteen years on porosity in aluminum castings....

Oct 03 2007

Advanced simulation techniques
Computer simulation study upon the influence of geometry on the critical velocity for molten aluminium R Cuesta, A Delgado, J A Maroto, D Mozo
Foundation for the Research and Development in Transport and Energy, CIDAUT, Spain.
67th World Foundry Congress
In aluminium casting processes, the entrainment of surface oxides into the bulk of liquid metal during mould filling determines a severe reduction of the strength of the cast part. In order to avoid this, melt velocity must be kept below a certain value, namely critical velocity, which is widely assumed to be equal to 0.5 m/s. In this paper we investigate, by means of computer simulation, the dependence of the critical velocity for pure ...

Oct 03 2007

Light alloys
Process development for highly stressed aluminium castings under consideration of the increase in performance of the diesel engines F. Mnich*, H.C. Saewert*, A. Tamez**, R. Bähr***, E. Krebs****
*NEMAK Europe; **NEMAK S. A. Mexico, *** U. of Magdeburg, Germany, ****Rautenbach-Guss, Germany
67th World Foundry Congress
This article will focus on the development of engine technology and its effect on innovation of a foundry. With the example of a diesel engine, which has experienced highest growth rates throughout the past years, the development of the process of the Nemak-Dynamic-Casting-Systems will be introduced. Its components, the cylinder head and the engine block, are subject to high stresses. Due to economic and scientific advantages that have be...

Sep 27 2007

Finishing and inspection
Accurate and complex NET-SHAPE castings for challenging markets M Horacek * and J Cilecek **.
* Brno University of Technology, CZ, ** Alucast Foundry, Tupesy, CZ.
67th World Foundry Congress
In this paper Lost Wax technology will be discussed as one of the „Netshape“ technologies. Achievable final casting dimensional accuracy and how to control/influence this by wax pattern injection parameters and also by other parameters during the Lost Wax process will be discussed. Included are two „case studies/examples“of investment castings, originally manufactured by other technologies. These demonstrat...