Graduate Research Papers

Availability

Open Access Graduate Research Paper

Keywords

Iron founding--Quality control; Risers (Founding)--Quality control; Foundries--Quality control;

Abstract

Shrinkage defects in ductile iron riser contacts has long been one of the most frustrating defects to eliminate for the foundry engineer. While process variation can definitively contribute to the occurrence of these defects most can be prevented if the risers are properly designed and/or applied to the castings to be fed. There are several proven methods for the designing risers some of which go back over 40 years ago. There are also new methods available today with the advancements of simulation software. Four of these riser design methods were evaluated for their ability to produce an internally sound casting and their yield efficiency. While all methods are still valid the Solidification Modeling Method also resulted in additional quality benefits by predicting other potential defects. Finally, many actual casting examples with riser contact shrinkage were reviewed and evaluated in order to prove that the root cause of most shrinkage defects in ductile iron riser contacts are the result of design or application mistakes. While the study involved large green sand ductile iron castings, the design and application recommendations are applicable to other casting sizes and molding methods.

Year of Submission

11-20-2003

Degree Name

Master of Arts

Department

Department of Industrial Technology

First Advisor

Yury Lerner

Comments

If you are the rightful copyright holder of this dissertation or thesis and wish to have it removed from the Open Access Collection, please submit a request to scholarworks@uni.edu and include clear identification of the work, preferably with URL.

Date Original

11-20-2003

Object Description

1 PDF file (51 pages)

Language

en

File Format

application/pdf

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