Assessment of core sands suitability for filling the core box and for compaction - by blowing methods

• Autorzy: Dańko J. , Dańko R.
• Języki publikacji: EN

Abstrakty

EN

The obtained effects of filling the core box cavity and moulding sand compaction in processes of core production by blowing methods (blowing, shooting) depend on several factors. The most important are: geometrical parameters of cavity and complexity of its shape, number, distribution and shape of holes feeding sands as well as the way of deaeration of a technological cavity. Values of individual parameters are selected according to various criteria, but first of all, they should be adjusted to properties of the applied core sand. One of the ways of a preliminary estimation of suitability of a core sand for filling the core box and for compaction by means of blowing methods is the determination of its fluidity and assessment how this parameter is changing when core sand is awaiting to be shot. Another criterion of suitability of core sands for the blowing process is their apparent density obtained at filling the testing core box of a complicated shape (Boenisch test). Various methods developed by several researchers, including the authors, allow to assess the tested property on the basis of special technological tests projecting the process into a laboratory scale. The developed criteria defining a degree or a filling ability factor provide a better possibility of assessing the core sand behaviour during flowing and core box filling, which indicate the value and structure of the obtained compacting decisive - after hardening - for strength and permeability. The mentioned above aspects were analysed - on the basis of authors' own examinations - in the hereby paper.

Słowa kluczowe

EN

core production; core blowing; core shooting; core sand

PL

nadmuchiwarka rdzeni; masa rdzeniowa; rdzeń wstrzeliwany

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2009
• Tom: Vol. 9, iss. 1
• Strony: 37--40
• Opis fizyczny: Bibliogr. 6 poz., rys., tab., wykr.

Twórcy

autor

Dańko J.

autor

Dańko R.

• Faculty of Foundry Engineering, AGH University of Science and Technology , Reymonta 23 str., 30-059 Kraków, Poland,

Bibliografia

• [1] Boenisch D., Knauf M.: Kernschiessen - Untersuchungen mit neuartigen Prufkorpern und verschiedenen Kernbindern. Giesserei 1991, no 18, pp. 640 -646.
• [2] Dańko J., Dańko R.: Dependance of Core Sand Compactibility and Core Sand Evacuation Coefficient from Shooting-blowing Apparatus. Proceedings of the Conference "Modern Foundry Technologies - Environmental Protection. Zakopane 2000, (in Polish).
• [3] Dańko J., Zych J.: Testing of Technological Properties of Foundry Cores in Aspect of Introducing Ultrasound Technique as a Diagnostic Method for Casting Cores Quality Assessment. Proceedings of the Conference "Modern Technologies in Foundry Engineering". Foundry Engineering Faculty of UST-AGH. Cracow 2008, pp. 25-32 (in Polish).
• [4] Dańko J.: Examination of Core Blowing Process Results in the Light of Boenisch and Knauff's and Author's Own Investigations. Proceedings of XIX Scientific Symposium of Foundry Engineering Faculty of UST-AGH. Part 1, Cracow 1993, pp. 187 - 194 (in Polish).
• [5] Dańko J.: Process of Manufacture of Foundry Cores and Moulds by Means of Blowing Methods. Investigation and Theory. Scientific Bulletins of University of Mining and Metallurgy no 1498, Bulletin 145, Cracow 1992, PL ISSN 0372-9443. (in Polish).
• [6] Zych J., Dańko J.: Non-destructive Method of Core Examination to Determine the Uniformity of Sand Compaction and the Distribution of Strength and Permeability. Proceedings of International Conference "Modern Methods of Core Production", Ceskomoravska vrchovina. Milovy 15-16. 04. 2003, pp. 45-53.