Our Papers and Presentations
You may send your comments/feedback to M. Kostic < kostic@niu.edu >. Thanks:
►M. Kostic, S.R. Vaddiraju, L. Reifschneider, "Design Improvement of a U-Profile Extrusion Die
Using Inverse CFD Simulation," Presentation [PPT] at 2005 North American CFD Summit, Dearborn, Michigan, June 7-9, 2005.
►Presentation 1 [PPT] (mod)at 2004 North American CFD Summit: Fluent Users' Group Meeting, Dearborn, Michigan, June 8-10, 2004
►Presentation 2 [PPT] at 2004 North American CFD Summit: Fluent Users' Group Meeting, Dearborn, Michigan, June 8-10, 2004
►1st Paper Manuscript in PDF format: ANTEC 2004 PAPER 293.pdf * PPT
►2nd Paper Manuscript in PDF format: ANTEC 2004 PAPER 1022.pdf
The Annual Technical Conference, ANTEC 2004 Chicago, May 16-20, of Society of Plastics Engineers is the largest international gathering of individuals who represent industry, government and academia in the field of plastics and synthetic polymers. http://www.4spe.org/semconf/antec/antec04.htm * Registration
*** 1st 2004 ANTEC Paper Title and Abstract *** Full paper: ANTEC 2004 PAPER 293.pdf
Extrusion Simulation and Experimental Validation to Optimize Precision Die Design
Srinivasa R. Vaddiraju*), M. Kostic*), L. Reifschneider&), A. Pla-Dalmau$), V. Rykalin%), and A. Bross$)
*) Northern Illinois University (NIU); &) Illinois State University, $) Fermi National Accelerator Laboratory, %) NICADD-Northern Illinois Center for Accelerator and Detector Development, NIU.
A CFD-simulation is performed for an existing die and compared with the actual polymer flow and dimensions of the extrudate. Experimental validation of the simulation is used to improve new die design by integrating flow simulation through the 3-D die geometry and the free-surface flow with swelling after the die. Modified die-land-and-lip profile is optimized using the so-called “inverse extrusion” simulation with an objective to improve accuracy of extrudate dimensions.
*** 2nd 2004 ANTEC Paper Title and Abstract *** Full paper: ANTEC 2004 PAPER 1022.pdf
COMPUTATIONAL DESIGN OF A U-PROFILE DIE AND CALIBRATOR
Louis G. Reifschneider, Illinois State UniversityAbstract
The objectives of this work are three-fold: 1) to validate that an open profile product can be made using simulation alone to design a die (design rules of thumb are not applied), 2) assess the role of the calibrator in shaping the free surface of the extrudate, and 3) quantify the heat transfer in a vacuum calibrator and assess how such data can be used to design calibrators for other products. The scope of this paper includes: 1) three-dimensional flow simulation to design a die to make a U-shaped extrusion, 2) experimental trials to validate the mass flow balance through the die and the cooling performance of the calibrator, and 3) comparison of the heat transfer data obtained during calibration trials to published data for profile calibrators.