Influence Green Sand System by Core Sand Additions

Open access

Influence Green Sand System by Core Sand Additions

Today, about two thirds of iron alloys casting (especially for graphitizing alloys of iron) are produced into green sand systems with usually organically bonded cores. Separation of core sands from the green sand mixture is very difficult, after pouring. The core sand concentration increase due to circulation of green sand mixture in a closed circulation system. Furthermore in some foundries, core sands have been adding to green sand systems as a replacement for new sands. The goal of this contribution is: "How the green sand systems are influenced by core sands?"

This effect is considered by determination of selected technological properties and degree of green sand system re-bonding. From the studies, which have been published yet, there is not consistent opinion on influence of core sand dilution on green sand system properties. In order to simulation of the effect of core sands on the technological properties of green sands, there were applied the most common used technologies of cores production, which are based on bonding with phenolic resin. Core sand concentration added to green sand system, was up to 50 %. Influence of core sand dilution on basic properties of green sand systems was determined by evaluation of basic industrial properties: moisture, green compression strength and splitting strength, wet tensile strength, mixture stability against staling and physical-chemistry properties (pH, conductivity, and loss of ignition). Ratio of active bentonite by Methylene blue test was also determined.

Pribulová, A. & Gengel, P. (2009). Complex treatment of dust from cast iron casting cleaning. Przegląd Odlewnictwa. 3, 150-153.

Rimoux, L. (2006). Valorisation des déchets de fonderie. Fonderie-Fondeurd'aujourd'hui. 257, 43-55.

Beňo, J., Bednářová, V., Špirutová, N. & Kříž, J. (2011). Alternative use of core mixtures in bentonite mixtures. Slévárenství. LIX (9-10), 309-313. (in Czech).

Kvaša, F. S. & Tumanova, L. P. (2005). O vlijaniji ostatkov stěržněj na svojstva formovočnych směsej. Litějnoje proizvodstvo. 13-16.

Boenisch, D. (1977). Effect of Coldbox, Hotbox and Corning Cores on the Properties of Bentonite Bonded Molding Sands. Aachen: Germany.

Naro, R. L. (2004). Influence of Chemical Binder Core Sand Contamination on Green Sand Molding Properties - 25 Years of Controversy. AFS Transactions. 112, paper 04-001(04).pdf, 19.

Dańko, R. (2010). Investigations of reclamation ability of used moulding sand with water glass binder and used sand with CO2 hardened alkaline resin. Archives of Foundry Engineering. 10 (Special Issue 2), 33-38.

Holtzer, M., Drożyński, D., Bobrowski, A., Mazur, M. & Isendorf, B. (2010). The influence of reclaim on properties of moulding sand with furan resin. Archives of Foundry Engineering. 10 (Special Issue 2), 61-64.

Fedoryszyn, A., Zych, J., Rudy, Cz. (2008). Problems of bentonite rebonding of sintetic systems sand in turbine mixers. Archives of Foundry Engineering. 08 (Special Issue 4).

Żymankowska-Kumon, S., Holtzer, M. & Grabowski, G. (2011). Thermal analysis of foundry bentonites. Archives of Foundry Engineering. 11 (4), 209-213.

Granlund, M. J. (1999). How Green Sand Systems are Impacted by Core Sand Dilution. Modern Casting. 35-37.

Boenisch, D. & Ruhland, N. Giesserei. 75 (4), 69-76.

Archives of Foundry Engineering

The Journal of Polish Academy of Sciences

Journal Information


CiteScore 2016: 0.42

SCImago Journal Rank (SJR) 2016: 0.192
Source Normalized Impact per Paper (SNIP) 2016: 0.316

Metrics

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 142 139 6
PDF Downloads 135 134 19