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Strength measurement of impulse compacted moulding sand

Mikulczyński T., Ciskowski S.

Archives of Foundry Engineering

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2011

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Vol. 11, iss. 1

79-82

EN

Analysis of impulse compaction process shows that during compaction process moulding sand is subject to deformation and changes of total pressure, measured inside compacted moulding sand, represent fading sinusoid. Measured pressure values in stationary states (after compaction process) are equal to the sum of squeezing pressure pc and the pressure resulting from compacting the sandmix pu, which expresses the obtained strength. Therefore experimental research of moulding sands were conducted. Strength factor Rc and pressure pu values were determined as a function of densening degree \delta. Analysis of presented results proves that pu pressure resulting from compacting of the moulding sand expresses compressive strength factor Rc. This confirms that developed methodology permits strength measurements of moulding sand in the mould. Moreover as it is possible to determine pu values with simulation research of developed mathematical model of impulse process it is possible to determine compressive strength factor.

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Selected simulation and experimental research of impulse compacting of moulding sand

Mikulczyński T., Ciskowski S.

Archives of Foundry Engineering

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2009

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Vol. 9, iss. 1

57-60

EN

Selected simulation and experimental research of impulse compacting of moulding sand has been presented. The mathematical model used in research was formulated on the ground of mathematical description of the impulse compacting head, as well as mathematical description of the deformation and compacting process of moulding sand. The presented simulating investigations of the mathematical model were performed in the Matlab - Simulink environment. The presented results justify the statement that the suggested mathematical model correctly represents the real course of the impulse compacting process of moulding sands and can be used for describing, designing and optimising the process.

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Mechanism of impulse compacting of moulding sands

Mikulczyński T., Bogdan M., Ciskowski S., Dworzak Ł.

Archives of Foundry Engineering

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2008

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Vol. 8, iss. 1 spec.

211--214

EN

A mathematical 3D model of impulse compaction process, developed in the Basic Automation Laboratory of the Institute of Production Engineering and Automation is presented. Experimental and simulation research analysis allowed to determine mechanism of impulse compacting of moulding sands. Mechanism and dynamics of this process evaluated on the grounds of relationships pc = f(t) representing time functions of total pressure in the sand layers located at different heights of the compacted sand column. Presented experimental and simulation research proved that developed 3D mathematical model of impulse compaction process of moulding sand describes this process in detail.

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3D model of impulse compaction of moulding sands model

Ganczarek M., Ciskowski S., Mikulczyński T.

Archives of Foundry Engineering

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2008

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Vol. 8, iss. 1

47-50

EN

A mathematical 3D model is presented, fully describing the impulse compaction process of moulding sands. The model is based on the models of the impulse head dynamics as well as of the deformation and compaction processes of moulding sand. The deformation and compaction processes were modelled on the grounds of the viscoelastic rheological model of moulding sand. It was found that knowing the and coefficients characterising viscous and elastic properties of moulding sand makes the necessary and sufficient condition for simulation testing of the developed model. The coefficients can be determined by ultrasonic testing of moulding sand. The simulation and experimental research of the impulse compaction process proved that the developed model describes the impulse compaction process very well.