Thesis (UNI Access Only)
Sand, Foundry--Additives; Water--Composition;
The purpose of this study is to determine if the hardness of water used in green sand will directly affect the properties of molding sand in a foundry sand system. This information will be used to help foundries determine if any improvements can be made to their sand system and reduce sand related defects within their scrap rate.
New silica sand and premixed binder were conditioned through a mull down, then dried out for further mixing and testing. The conditioned sand was then mixed in 5-pound batches using two different types of water: hard and soft. After the batches were mixed, the molding properties were tested using compactability, permeability, green compression strength, green shear strength, and flowability tests to measure a variety of factors foundry employees can use to improve their process. Analysis of covariance and F-test methods were used to compare the results from the batches of mixed sand to see if any significant differences exist.
Results showed that there are some similarities between the two types of water used when mixed into a green sand mixture. The analysis of covariance showed the starting moisture and final moisture of the sand being the only statistically significant variables throughout all sand testing and analysis completed. This relationship is already widely known throughout the foundry industry and is used in green sand systems throughout the world.
Year of Submission
Master of Science
Department of Applied Engineering and Technical Management
Scott Giese, Chair
1 PDF file (xi, 66 pages)
©2022 Matthew Krueger
Krueger, Matthew P., "Preliminary investigation into the effects of hard and soft water on silica green sand properties" (2022). Dissertations and Theses @ UNI. 1205.