The Effect of Bridge Orientation in Casting Machine on the Castability and Quality of Base Metal Castings
Introduction: The aim of this study was to evaluate the effect of bridge orientation in casting machine on castability and quality of base metal castings. Methods: Three groups of patterns with different direction and lengths in casting machine were casted and then studied qualitatively and quantita...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Mashhad University of Medical Sciences
2012-09-01
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| Series: | Journal of Dental Materials and Techniques |
| Subjects: | |
| Online Access: | http://jdmt.mums.ac.ir/?_action=showPDF&article=94&_ob=d8f1dbf77a1de3c69ed73060b593287f&fileName=full_text.pdf |
| Summary: | Introduction: The aim of this study was to evaluate the effect of bridge orientation in casting machine on castability and quality of base metal castings. Methods: Three groups of patterns with different direction and lengths in casting machine were casted and then studied qualitatively and quantitatively using mean and standard deviation in table of frequency. Results: Larger nodules and porosities were on the joints of sprue in horizontal specimens (P=0.01 and 0.048, respectively). There was no significant difference in castability between 3-, 5- and 6-unit bridges in relation to their direction in casting machine (P=0.5). An increase in bridge length led to more variation in length and width. The position of bridges also played an important role in the length variation in bridges. Conclusion: The direction of bridges had no effect on base metal castability but a vertical position resulted in a better casting quality and an increase in length of the bridges caused more defects in castings. |
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| ISSN: | 2322-4150 2252-0317 |