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ArticleName Investment casting: technical solutions to saving of resources
ArticleAuthor I. O. Leushin, L. I. Leushina, A. N. Grachev, V. A. Ulyanov.
ArticleAuthorData

Nizhny Novgorod State Technical University named after R. E. Alekseev:

I. O. Leushin, L. I. Leushina, A. N. Grachev, V. A. Ulyanov

E-mail: lmps@nntu.nnov.ru

Abstract

Analysis of a generalized technological diagram of investment casting has permitted to single out its major hitch while being implemented within current facilities — manufacturing of multi-layer shell molds. This lengthy, onerous stage consists of a series of operations, such as, for example, assembly of pattern blocks; preparation and application of slurry and the material of sand fill onto the pattern blocks; drying of shell layers; dewaxing; shell firing; etc. That is why the authors’ research focused on solving problems relating to this stage. A task was set to cut energy consumption in firing of shell molds prior to their delivery for steel-melt pouring, which significantly bears on the casting resultant quality. To minimize formation of hard non-metallic inclusions in the casting’s body, as well as oxidation and decarburization of its surface layer, the authors believe expedient to ensure decrease in the shell mold material’s activity. It may be attained by creation of a regenerating atmosphere in the zone of physics-chemical interaction of the mold with the poured metal melt. Implementation of the above measures will ensure decrease in materials consumption, increase in environmental safety of investment casting — a method of producing parts which is competitive globally.

keywords Investment casting, firing of shell molds, wax utilization, exothermic reactions, crack forming, nonmetallic inclusions, decarburization
References

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