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Number of results: 4
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Abstract

A proper management of sand grains of moulding sands requires knowing basic properties of the spent matrix after casting knocking out. This information is essential from the point of view of the proper performing the matrix recycling process and preparing moulding sands with reclaimed materials. The most important parameter informing on the matrix quality – in case of moulding sands with organic binders after casting knocking out – is their ignition loss. The methodology of estimating ignition loss of spent moulding sands with organic binder– after casting knocking out - developed in AGH, is presented in the paper. This method applies the simulation MAGMA software, allowing to determine this moulding sand parameter already at the stage of the production preparation.
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Authors and Affiliations

R. Dańko
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Abstract

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 behavior 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 analyzed

– on the basis of authors’ own examinations - in the hereby paper.

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Authors and Affiliations

R. Dańko
J. Dańko
M. Skrzyński
A. Burbelko
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Abstract

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.
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Authors and Affiliations

J. Danko
R. Dańko
M. Skrzyński
A. Burbelko
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Abstract

The paper presents research on the development of a line-start synchronous reluctance motor (LSSynRM) and line-start permanent magnet synchronous motor (LSPMSM) based on components of a mass-produced three-phase low-power squirrel cage induction motor (IM). The aim of the research was to modify the squirrel cage rotor structure for which the best functional parameters characterizing the steady state of the LSSynRM and LSPMSM were obtained, while meeting the additional requirements for asynchronous start-up. Field-circuit models of the LSSynRM and LSPMSM have been developed in the professional finite element method (FEM) package, MagNet, and applied in the design and optimization calculations of the considered machines. Experimental testing on the designed LSSynRM and LSPMSM prototypes were carried out. The obtained results were compared with the performance of the reference IM. The conclusions resulting from the comparative analysis of these three motors are given and proposals for further work are discussed.

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Authors and Affiliations

Wieslaw Lyskawinski

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