This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Casting Porosity Elimination in CGI Cylinder Head
Technical Paper
2009-01-0219
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Compacted Graphite Iron (CGI) has been used for many of recently developed cylinder heads and engine blocks. CGI has been the choice for most of the automotive and truck manufacturers since it is combining the useful properties of both grey and nodular cast irons in one material.
Although its superior mechanical properties, the production process of CGI makes the engineers to pay more attention to the microstructural and design-related issues. In the case of heavy duty cylinder head, X-Ray examination results showed that significant amount of porosity was present at the guide hole area. MagmaSoft casting simulation of the cylinder head revealed that some hot spot areas were formed during solidification, due to the insufficient feeder capacity, the location of the feeder and complex design of the water galleries.
The aim of the project is to eliminate the casting porosity by improving the feeding system design to allow the excess liquid metal to feed the part properly while shrinking during solidification. Modifications such as changing the head molding design and the location of new feeders are given in detail in this paper. Redesign of the feeding system prevented the formation of hot spots, thus delivering a robust end-product.
Recommended Content
Authors
Citation
Özdemir, Ö., Ebrinç, A., and Ünüvar, B., "Casting Porosity Elimination in CGI Cylinder Head," SAE Technical Paper 2009-01-0219, 2009, https://doi.org/10.4271/2009-01-0219.Also In
References
- Shao, S., Dawson, S., Lampic, M., “The Mechanical and Physical Properties of Compacted Graphite Iron”, Mat.-wiss. u. Werkstofftech. 29 1998 397 411
- Dawson, S., Schroeder, T., “Practical Applications for Compacted Graphite Iron”, presented at AFS Transactions 04-047 05 2004
- Guesser, W., Schroeder, T., Dawson, S., “Production Experience with Compacted Graphite Iron Automotive Components“ presented at AFS Transactions 01-071, IL, USA” 2001
- Dawson, S., Hollinger, I., Robbins, M., Daeth, J., Reuter, U., Schulz, H. “The Effect of Metallurgical Variables on the Machinability of Compacted Graphite Iron” presented at SAE World Congress, 2001-01-0409, Detroit, Michigan” 2001
- Dawson, S. “Process Control for the Production of Compacted Graphite Iron”, presented at the 106th AFS Casting Congress, Kansas City” 2002
- Özdemir, Ö. Ebrinç, A. Ünüvar, B. “CGI Development for Ecotorq Cylinder Head at Ford Otosan”, presented at the 3rd VDI – Fachtagung: Ventiltrieb und Zylinderkopf, Würzburg” 2008