An optimization of processing parameters and casting quality in the expendable pattern casting (EPC) process

Author

Jiang Fu

Abstract

"The expendable pattern casting (EPC) process has been studied from several directions in order to optimize processing parameters and casting quality. A brief review is presented in Paper 1. Paper 2 describes the effect of vent-holes inside the pattern on mold filling and casting quality in the EPC process. It is found that under the same casting conditions, faster mold filling speed and fewer surface defects occurred in castings made from patterns with vent-holes for iron castings, while very little difference was found for aluminum castings poured below about 730C (1346F). Paper 3 includes an investigation of mold filling in thin section castings produced by the process. The fluidity in aluminum alloys was found to depend on a complex relationship between pouring temperature and the mechanism by which the decomposition products from the foam pattern were removed through the refractory coating. In gray iron, fluidity depends on the more rapid decomposition of the foam and rapid transport of gaseous decomposition products through the coating. High permeability coatings and increased metallostatic pressure improve the fluidity of both aluminum and iron castings. Paper 4 is related to the transport of decomposition products in the unbonded sand. These transformations suggest that transfer of heat into and through the unbonded sand is dependent on both heat and mass transfer. All the experiments were conducted for both aluminum and gray iron"--Abstract, page iv.

Advisor(s)

Askeland, Donald R.
Tsai, Hai-Lung

Committee Member(s)

Kohser, Ronald A.
Ramsay, Christopher W.
Watson, John L.

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Metallurgical Engineering

Publisher

University of Missouri--Rolla

Publication Date

Summer 1992

Journal article titles appearing in thesis/dissertation

• A review of the expendable pattern casting (EPC) process
• Effect of vent-holes in patterns on filling process and casting quality using the evaporative pattern process
• Mold filling in thin section castings produced by the expendable pattern casting process
• Transport of foam decomposition products into the sand in the EPC process

Pagination

xvi, 151 pages

Note about bibliography

Includes bibliographical references.

Rights

© 1992 Jiang Fu, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type

text

Language

English

Thesis Number

T 6438

Print OCLC #

28119731

Electronic OCLC #

1101120657

Recommended Citation

Fu, Jiang, "An optimization of processing parameters and casting quality in the expendable pattern casting (EPC) process" (1992). Doctoral Dissertations. 840.
https://scholarsmine.mst.edu/doctoral_dissertations/840