Abstract
Generally cores are produced by the same techniques as molds. Small- and medium-size cores are often blown or shot into the core box. Molding sands can differ from each other according to their composition, binding methods, and consistency. A few systems, taking into account dividing of sands in dependence of the assumed criterion, were developed. Molding sands can be divided in dependence of their destination, the function which they have in molds, or a wear degree. Assuming the chemical character of the binding material as the criterion, there are inorganic or organic binders. The temperature, at which a hardening process of binders occurs, can be also the dividing criterion: room temperature, increased temperature, or high temperature.
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Notes
- 1.
Work time is the property determining time – calculated from the moment of coming into contact of all components necessary for sand binding. During this time, a sand is suitable for forming (making molds or cores).
- 2.
Strip time – the period after which a core can be removed from a core-box or a pattern from a mold without causing damages.
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Holtzer, M., Kmita, A. (2020). Division of the Molding and Core Sands: Criteria. In: Mold and Core Sands in Metalcasting: Chemistry and Ecology . Springer, Cham. https://doi.org/10.1007/978-3-030-53210-9_5
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