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TY  - THES
AU  - Pelzer, Mark
TI  - Optimierung der Kernherstellung durch numerische Simulation
CY  - Aachen
PB  - Publikationsserver der RWTH Aachen University
M1  - RWTH-CONV-120113
SP  - XXVIII, 105 S. : Ill., graph. Darst.
PY  - 2000
N1  - Prüfungsjahr: 2000. - Publikationsjahr: 2001
N1  - Aachen, Techn. Hochsch., Diss., 2000
AB  - The core shooting process is based on the sudden expansion of a limited compressed air volume, which shoots the molding material into the core box with high velocity. Apart from the mould filling the purpose is to release an adequate compression of the molding material. During the entire time it is necessary to draw off the air by means of venting lines, which are situated in the walls of the core box. Thereby, the positioning of the venting lines is of main interest. With the use of a numerical simulation it should be possible to create the core box layouts for every geometry and size without previous time consuming experiments. The simulation presented in this work is based on the iterative solution of a two phase flow, in which the fluid phase is air and the solid phase is granular. The Eulerian formulation serves as a basis of design, which treats both phases as a continuum. The coupled differential equations to be resolved are, for one the continuity conservation equations (mass balances) and, secondly the momentum conservation equations for both phases. Fundamental knowledge about the flow behavior in the core box is necessary to carry out this simulation. The volume fraction of the sand and the entry velocity into the core box of both phases must be determined experimentally. With these boundary conditions first, two dimensional simulation results are available for different geometries.
LB  - PUB:(DE-HGF)11
UR  - https://publications.rwth-aachen.de/record/58177
ER  -