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1
Content available Evaluation of Collapsibility of Selected Core Systems
Obzina Tomas, Merta V., Rygel J., Lichý P., Drobíková K.
Archives of Foundry Engineering
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2022
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Vol. 22, iss. 1
48--52
EN
There are mainly two different ways of producing sand cores in the industry. The most used is the shooting moulding process. A mixture of sand and binder is injected by compressed air into a cavity (core), where it is then thermally or chemically cured. Another relatively new method of manufacturing cores is the use of 3D printing. The principle is based on the method of local curing of the sand bed. The ability to destroy sand cores after casting can be evaluated by means of tests that are carried out directly on the test core. In most cases, the core is thermally degraded and the mechanical properties before and after thermal exposure are measured. Another possible way to determine the collapsibility of core mixtures can be performed on test castings, where a specific casting is designed for different binder systems. The residual strength is measured by subsequent shake-out or knock-out tests. In this paper, attention will be paid to the collapsibility of core mixtures in aluminium castings.
2
Content available Core Blowing Process - Assessment of Core Sands Properties and Preliminary Model Testing
Dańko R., Dańko J., Burbelko A., Skrzyński M.
Archives of Foundry Engineering
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2014
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Vol. 14, iss. 1
25--28
EN
The effects of filling the core box cavity and sand compaction in processes of core production by blowing methods (blowing, shooting) depend on several main factors. The most important are: geometrical parameters of cavity and complexity of its shape, number, distribution and shape of blowing holes feeding sands as well as the venting of a technological cavity. Values of individual parameters are selected according to various criteria, but mostly they should be adjusted to properties of the applied core sand. Various methods developed by several researchers, including the authors own attempts, allow to assess core sands properties 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 are analysed – on the basis of authors’ own examinations - in the hereby paper.
3
Content available Conceptual Design of a Core Making System
Asłanowicz M., Dańko J., Dańko R., Fedoryszyn A., Fulko T.
Archives of Foundry Engineering
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2013
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Vol. 13, iss. 1 spec.
13--16
EN
The paper presents the topics related with the production of small and medium-sized cores by means of blowing methods. The basic information concerning the manufacturers of the blowing machines and the general characteristics of machines offered by them are presented. The basic design of blowing machines are presented with discussions of the theoretical works of Boenisch, Axionov and J. Dańko determining important from the technology point of view sand and air flow parameters including different methods of core box filling factors and the factor eV representing the sand ability to evacuate from the shooting chamber.
4
Content available Parameters of the two-phase sand-air stream in the blowing process
Dańko J., Dańko R., Burbelko A. A., Skrzyński M.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 4
25-30
EN
Theoretical problems concerning the determination of work parameters of the two-phase sand-air stream in the cores making process by blowing methods as well as experimental methods of determination of the main and auxiliary parameters of this process decisive on the cores quality assessed by the value and distribution of their apparent density are presented in the paper. In addition the results of visualisations of the core-box filling with the sand-air stream, from the blowing chamber, obtained by the process filming by means of the quick-action camera are presented in the paper and compared with the results of simulation calculations with the application of the ProCast software.
5
Content available remote Badania struktury rozkładu gęstości masy w rdzeniach wykonanych za pomocą wstrzeliwania
Dańko J., Zych J., Dańko R., Sroczyński A.
Archiwum Odlewnictwa
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2006
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R. 6, nr 22
133-138
PL
W artykule przedstawiono badania rozkładu gęstości pozornej rdzeni sporządzonych przez nadmuchiwanie i wstrzeliwanie. Zastosowano trzy rodzaje osnowy w masach sporządzonych zgodnie z wymaganiami fenolowego procesu coldbox Ashlanda. Do oceny jakości realizowanego procesu zastosowano badania gęstości pozornej zagęszczonej masy rdzeniowej metodami tradycyjnymi, jak również za pomocą pomiaru prędkości propagacji fali ultradźwiękowej.
EN
The results of core sand density distribution inside the cores manufactured by blowing and shooting techniques have been presented in the article. Three kinds of silica basis were used in testing core sands prepared according to phenolic Ashland cold-box process. The measurement of core sand apparent density obtained inside core volume identified both by the traditional methods as by the ultrasonic valve velocity propagation have been adopted as a validation factors of process quality.
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