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1
Content available Role of Sand Grains in Sorption Processes by Surface Layers of Components of Sand Moulds
Kaźnica N.
Archives of Foundry Engineering
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2017
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Vol. 17, iss. 1
87--92
EN
The results of researches of sorption processes of surface layers of components of sand moulds covered by protective coatings are presented in the hereby paper. Investigations comprised various types of sand grains of moulding sands with furan resin: silica sand, reclaimed sand and calcined in temperature of 700 oC silica sand. Two kinds of alcoholic protective coatings were used – zirconium and zirconium – graphite. Tests were performed under condition of a constant temperature within the range 30 – 35oC and high relative air humidity 75 - 80%. To analyze the role of sand grains in sorption processes quantitavie moisture sorption with use of gravimetric method and ultrasonic method were used in measurements. The tendency to moisture sorption of surface layers of sand moulds according to the different kinds of sand grains was specified. The effectiveness of protective action of coatings from moisture sorption was analyzed as well. Knowledge of the role of sand grains from the viewpoint of capacity for moisture sorption is important due to the surface casting defects occurrence. In particular that are defects of a gaseous origin caused by too high moisture content of moulds, especially in surface layers.
2
Content available Effectiveness of Protective Action of Coatings from Moisture Sorption into Surface Layer of Sand Moulds
Kaźnica N., Zych J.
Archives of Metallurgy and Materials
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2016
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Vol. 61, iss. 4
2111--2116
EN
The results of investigations of the sorption process of surface layers of sand moulds covered by zirconium and zirconium - graphite alcohol coatings are presented in the paper. Investigations comprised two kinds of sand grains (silica sand and reclaimed sand) of moulding sand with furan resin. Tests were performed under conditions of a high relative air humidity 75-85% and a constant temperature within the range 28–33°C. To evaluate the effectiveness of coatings protective action from moisture penetration into surface layers of sand moulds gravimetric method of quantitavie moisture sorption and ultrasonic method were applied in measurements. The optimal number and kind of coatings from the viewpoint of protection from moisture sorption were specified for furan moulding sands with quartz sand and reclaimed sand as well. Knowledge of proper coatings selection is important due to protection from high air humidity and its adverse effects. What is more, it can allow to select the proper storage conditions of casting moulds waiting for being poured with liquid metals. This can limit the occurrence of surface defects which are caused by too high humidity of casting moulds, especially in surface layer.
3
Content available Investigations of the Sorption Process’ Kinetics of Sand Moulds’ Surface Layers under Conditions of a High Air Humidity
Kaźnica N., Zych J.
Archives of Foundry Engineering
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2015
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Vol. 15, iss. 3 spec.
29--32
EN
The results of investigations of the sorption process of surface layers of sand moulds under conditions of a high air humidity are presented in the paper. Investigations comprised three kinds of moulding sands with inorganic and organic binders: moulding sand with hydrated sodium silicate with furfuryl resin and with alkyd resin. Tests were performed on the prototype research stand allowing to maintain a constant, high temperature of surroundings (28–33°C) and the relative air humidity (above 95%). The gravimetric method was applied in measurements. The proposed method allows to assess the amount of water which permeates by the area unit of surface layers of sand moulds into their insides. Knowledge of such parameter allows to select the proper storage conditions of casting moulds waiting for being poured with liquid metals. This can limit the occurrence of surface defects which are caused by too high humidity of casting moulds.
4
Development and implementation of the casting technology concerning a new series of types of electric motor housings
Tomczyński Sz.
Hutnik, Wiadomości Hutnicze
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2010
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Vol. 77, nr 5
249-251
EN
The paper presents problems related to the development and the implementation of production technology concerning cast iron housings of CELMA electric motors moulded in furan resin sand in “Terlecki” Foundry at Gruszewnia, Poland. Technological problems encountered in the course of production of large, thin-walled castings of intricate shapes have been presented. There have been discussed the subsequent stages of technological tests which has resulted in developing three various moulding technologies depending on the casting configuration. The proposed technologies have also demanded for implementation of moulding in furan moulding sands.
PL
W artykule omówiono zagadnienia związane z opracowaniem i wdrożeniem w Odlewni Żeliwa „Terlecki” w Gruszewni technologii żeliwnych odlewów korpusów silników elektrycznych CELMA formowanych w samoutwardzalnych furanowych masach formierskich. Przedstawiono problemy technologiczne napotykane przy wytwarzaniu dużych, cienkościennych odlewów o skomplikowanych kształtach. Przedstawiono kolejne etapy prób technologicznych, w wyniku których opracowano 3 różne technologie formowania w zależności od konfiguracji odlewu. Zaproponowane technologie wymagały również opracowania i wdrożenia technologii formowania w furanowych masach formierskich.
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