As-Cast Surface Characterization for Steel Using Disk-Shaped Chemically Bonded Sand Specimens

Autor: Robert B. Tuttle, Sam Ramrattan, L. Wells
Rok vydání: 2020
Předmět:
Zdroj: International Journal of Metalcasting. 15:382-390
ISSN: 2163-3193
1939-5981
DOI: 10.1007/s40962-020-00520-4
Popis: Chemically bonded sand systems are an important and growing part of foundry technology, and their interaction at the mold–steel interface is of great interest. With today’s emphasis on near-net-shape steel castings, and with ever more stringent casting quality requirements, there is a need to quickly and affordably characterize as-cast surface quality. In addition, characterizing shakeout performance is necessary to meet today’s steel casting efficiency requirements. New AFS standard tests using disk-shaped specimens (AFS 3344-18-S), such as the thermal distortion test (AFS 3350-18-S), have proved to be efficient and effective techniques for detecting anomalies and measuring distortions for chemically bonded sand binder systems. However, these laboratory tests are unable to address all the influences at the mold–steel interface. Furthermore, simulation software is not yet able to predict mold/steel interfacial conditions. Thus, performing actual casting trials remains necessary. This paper aims to investigate, for steel castings, the effects different chemically bonded sand systems have towards shakeout performance and as-cast surface quality. An improved steel casting trial, using disk-shaped specimens, that allows several core specimens to be wetted simultaneously was employed. As-cast surface quality was assessed using a state-of-the-art 3D macroscope. Results suggest that various chemically bonded sand systems provide different shakeout performances and as-cast surfaces.
Databáze: OpenAIRE
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