This paper presents the results of experimental and numerical studies of hot distortion phenomenon in the phenolic urethane cold box systems. Dual Pushrod Dilatometer has been used to measure a thermal expansion/contraction of phenolic urethane cold box sand core specimens at temperature range from 25° C to 800° C. The high temperature tensile tests showed that the tensile strength of the phenolic urethane cold box silica sand cores is significantly affected by the bench life, temperature and binders level. High temperature hot distortion furnace tests on cylindrical cores showed that some aluminum coatings increase the temperature limit when distortion starts, but can’t prevent it. The hot distortion test aluminum castings showed that regardless of the application of coating, the type of coating, and anti-veining additives, all cores (silica sand) with density less than the density of the molten metal (aluminum alloy) were significantly distorted. Numerical simulations of the liquid metal flow around the cylindrical sand core and analysis of dynamic forces acting on the core during fill process showed that a buoyancy force is the major contributor to the hot distortion. It is concluded that the one of the solutions in preventing the hot distortion of sand cores is increasing their weigh, which will balance the buoyancy force and will bring the resultant force to the minimum. The hot distortion test castings using zircon sand cores (both coated and non-coated) with density almost equal to the density of the molten aluminum proved our predictions, and hot distortion has been prevented.
Skip Nav Destination
ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
July 11–15, 2004
Charlotte, North Carolina, USA
Conference Sponsors:
- Heat Transfer Division and Fluids Engineering Division
ISBN:
0-7918-4692-X
PROCEEDINGS PAPER
Numerical Simulations and Experimental Study of Hot Core Distortion Phenomenon in Aluminum Casting
Sayavur Bakhtiyarov,
Sayavur Bakhtiyarov
Auburn University, Auburn, AL
Search for other works by this author on:
Ruel A. Overfelt,
Ruel A. Overfelt
Auburn University, Auburn, AL
Search for other works by this author on:
Amit Suryawanshi,
Amit Suryawanshi
Auburn University, Auburn, AL
Search for other works by this author on:
Johnathon Capps
Johnathon Capps
Auburn University, Auburn, AL
Search for other works by this author on:
Sayavur Bakhtiyarov
Auburn University, Auburn, AL
Ruel A. Overfelt
Auburn University, Auburn, AL
Amit Suryawanshi
Auburn University, Auburn, AL
Johnathon Capps
Auburn University, Auburn, AL
Paper No:
HT-FED2004-56510, pp. 1025-1034; 10 pages
Published Online:
February 24, 2009
Citation
Bakhtiyarov, S, Overfelt, RA, Suryawanshi, A, & Capps, J. "Numerical Simulations and Experimental Study of Hot Core Distortion Phenomenon in Aluminum Casting." Proceedings of the ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. Volume 3. Charlotte, North Carolina, USA. July 11–15, 2004. pp. 1025-1034. ASME. https://doi.org/10.1115/HT-FED2004-56510
Download citation file:
8
Views
Related Proceedings Papers
Related Articles
Numerical Simulations and Experimental Study of Liquid Metal Flow Around Sand Core
J. Fluids Eng (May,2006)
Computational Design of Corrosion-Resistant Fe–Cr–Ni–Al Nanocoatings for Power Generation
J. Eng. Gas Turbines Power (May,2010)
Mechanical Properties of Aluminum Casting Alloys at Elevated Temperatures
Trans. ASME (January,1928)
Related Chapters
Chitosan-Based Drug Delivery Systems
Chitosan and Its Derivatives as Promising Drug Delivery Carriers
Piping Design
Power Boilers: A Guide to the Section I of the ASME Boiler and Pressure Vessel Code, Second Edition
Section III: Subsections NC and ND — Class 2 and 3 Components
Companion Guide to the ASME Boiler and Pressure Vessel Code, Volume 1, Fourth Edition