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Novel Measurement Method to Study Thermal Aspects of Molding Mixture Decomposition

Svidró J. T., Diószegi A.

Journal of Casting & Materials Engineering

2018

Vol. 2, no. 3

63--66

A wide variety of molding mixtures are extensively used in the process of the sand casting of metal components today. The sector is continuously developing in production volume; moreover, the expectations of customers are increasing on a monthly basis (also from a quality point of view). Even though mold and core manufacturing are well-organized routines in most foundries, technological problems still appear that can lead to technological problems and casting defects. These trends are forcing metal casters to come up with fitting strategies to solve their daily production challenges, while their suppliers are expected to keep up the continuous development of their existing foundry products and to find innovative solutions as well as new material combinations. Research on molding materials and their properties must, therefore, take a step forward accordingly to generate the necessary new knowledge to understand the behavior of mold and core mixtures during casting. This paper summarizes the latest results of a novel measurement method suitable for studying the degradation characteristics of different molding materials from a new perspective. The fundamentals of the method are based on a thermal analysis, focusing on the heat-absorption behavior of greensand and two types of chemically bonded sands regardless of the binder type and amount or the manufacturing process.

Evidence for a shallowing event in the Upper Turonian (Cretaceous) Mytiloides scupini Zone of northern Germany

Wiese F., Kroger B.

Acta Geologica Polonica

1998

Vol. 48, no. 3

265-284

Based on the evidence of a regression in the Late Turonian (Cretaceous) scupini Zone of the Munsterland Cretaceous Basin (Westphalia), the exposures Nettlingen and Gross-Flothe are investigated in order to discover whether or not a comparable event can be observed in Lower Saxony. The lithological and faunal investigation of the two localities show this to be the case. This regressive event is interpreted to be the expression of a sequence boundary, separating two 3rd order sea-level cycles. The lower sequence, the base of which is located above the main Hyphantoceras Event in the middle Late Turonian of northern Germany, is termed the "flexuosum Sequence". The sequence above the sequence boundary, which ranges into the Lower Coniacian Cremnoceramus deformis Zone, spans approximately the reported range of Didymotis costatus. It is, therefore, named the "Didymotis Sequence". It can be shown that the observed sequence boundary can also be recognized in Spain, southern England, Poland and the Czech Republic.