On Determining the Critical Velocity in the Shot Sleeve of a High-Pressure Die Casting Machine Using Open Source CFD

Fluids

Michael Vynnycky¹  Sebastian Kohlstädt¹  Stephan Goeke²  Andreas Gebauer-Teichmann³ 

[1] Division of Processes, Department of Materials Science and Engineering, KTH Royal Institute of Technology, Brinellvägen 23, 100 44 Stockholm, Sweden;Institute of Mechanics, Kassel University Mönchebergstr. 7, 34125 Kassel, Germany;Volkswagen AG—Brieffach 017/73540, 38239 Salzgitter, Germany;

关键词: compressible two-phase flow;    high-pressure die casting;    shot sleeve;    critical velocity;    OpenFOAM;   

DOI  :  10.3390/fluids6110386

来源: DOAJ

【 摘 要 】

This paper investigates the critical plunger velocity in high-pressure die casting during the slow phase of the piston motion and how it can be determined with computational fluid dynamics (CFD) in open source software. The melt-air system is modelled via an Eulerian volume-of-fluid approach, treating the air as a compressible perfect gas. The turbulence is treated via a Reynolds-averaged Navier Stokes (RANS) approach that uses the Menter SST k-$\omega$ model. Two different strategies for mesh motion are presented and compared against each other. The solver is validated via analytical models and empirical data. A method is then presented to determine the optimal velocity using a two-dimensional (2D) mesh. As a second step, it is then discussed how the results are in line with those obtained for an actual, industrially relevant, three-dimensional (3D) geometry that also includes the ingate system of the die.

【 授权许可】

Unknown