Wyniki wyszukiwania - BazTech

1

Casting ductile iron in layer moulds made from ecological sands

Rączka M., Gandurski K., Isendorf B.

Archives of Foundry Engineering

|

2012

|

Vol. 12, iss. 3

99-104

EN

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%.

2

Production of steel casts in two-layer moulds with alkaline binders. Part 1. Backing sand with the alkaline inorganic binder RUDAL

Holtzer M., Drożyński D, Bobrowski A., Tomczak M., Rozmiarek E., Isendorf B.

Archives of Foundry Engineering

|

2011

|

Vol. 11, iss. 2

41-46

EN

Steel casts in Z.N. POMET were produced in moulds made of the moulding sand Floster. This sand did not have good knocking out properties, required a significant binder addition (4.5-5.0 parts by weight), and the casting surface quality gave rise to clients objections. Therefore a decision of implementing two-layer moulds, in which the facing sand would consist of the moulding sand with an alkaline organic binder while the backing sand would be made of the moulding sand with an inorganic binder also of an alkaline character - was undertaken. The fraction of this last binder in the moulding sand mass would be smaller than that of the binder used up to now (water glass). The application of two moulding sands of the same chemical character (highly alkaline) should facilitate the reclamation process and improve the obtained reclaimed material quality, due to which it would be possible to increase the reclaim fraction in the moulding sand (up to now it was 50%). The results of the laboratory investigations of sands with the RUDAL binder are presented in the paper.

PL

Odlewy staliwne w Z.M. POMET wykonywane były w formach z masy Floster. Masy te posiadały niezbyt dobrą wybijalność, konieczny był znaczny dodatek spoiwa (4,5-5,0 cz. wag.), a jakość powierzchni odlewów budziła zastrzeżenia klientów. Dlatego też podjęto decyzję o wdrożeniu form dwuwarstwowych, w których masę przymodelową stanowiłaby masa ze spoiwem organicznym o charakterze alkalicznym, a masę wypełniającą masa ze spoiwem nieorganicznym również o charakterze alkalicznym, którego udział w masie byłby mniejszy niż dotychczasowego spoiwa (szkła wodnego). Zastosowanie dwóch mas o tym samym charakterze chemicznym (wysoce alkaliczne) powinno znacznie ułatwić proces regeneracji i poprawić jakość otrzymywanego regeneratu, dzięki czemu możliwy będzie większy udział regeneratu w masie (dotychczas było to 50%). W artykule przedstawiono wyniki badań laboratoryjnych masy ze spoiwem RUDAL.

3

Production of Steel Casts in Two-Layer Moulds with Alkaline Binders. Part 2: Facing sand with the alkaline organic binder REZOLIT

Holtzer M., Bobrowski A., Drożyński D., Tomczak M., Rozmiarek E., Isendorf B.

Archives of Foundry Engineering

|

2011

|

Vol. 11, iss. 2 spec.

81--86

EN

This paper constitutes the second part of the article concerning the implementation of the two-layer mould technology for steel casts in Z.M. POMET. The results of the laboratory examinations of the backing sand with the inorganic binder RUDAL were presented in the first part of the paper. Whereas in the second part the results of the laboratory testing of the facing sand with the alkaline resin REZOLIT are given. The technology of two-layer moulds was already implemented in Z.M. POMET within the target project. Examples of castings made in this technology are shown in the final part of this paper.

PL

Jest to 2 część artykułu dotyczącego wdrożenia technologii form dwuwarstwowych do wykonywania odlewów staliwnych w Z.M. POMET. W części 1 przedstawiono wyniki badań laboratoryjnych masy wypełniającej ze spoiwem nieorganicznym RUDAL. Natomiast w części 2 zamieszczono wyniki badań laboratoryjnych masy przymodelowej z żywicą alkaliczną REZOLIT. Technologia form dwuwarstwowych została już wdrożona w Z.M. POMET w ramach projektu celowego. W końcowej części artykułu zamieszczono przykłady wykonanych odlewów w tej technologii.