Abstract
The article contains the results of tests performed under the target
project in Hardtop Foundry Charsznica.
The objective of the tests and studies was to develop a technology of making
high-quality ductile iron castings, combined with
effective means of environmental protection. The studies presented in this
article related to castings weighing from 1 to 300 kg made from ductile
iron of grades 400-15 and 500-7, using two-layer moulds, where the facing
and core sand was the sand with an alkaline organic binder, while backing
sand was the sand with an inorganic geopolymer binder.
A simplified method of sand reclamation was applied with possible reuse of the
reclaim as an addition to the backing sand. The cast
iron spheroidising treatment and inoculation were selected taking into account
the specific conditions of Hardtop Foundry. A pilot batch of castings was
made, testing the gating and feeding systems and using exothermic sleeves
on risers. The study confirmed the validity of the adopted concept of
making ductile iron castings in layer moulds, while maintaining the
content of sand with an organic binder at a level of maximum 15%.
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