Wyniki wyszukiwania - BazTech

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Pomiary nacisków w ośrodkach rozdrobnionych

Mikulczyński T., Fita S., Ciskowski S., Dworzak Ł.

Pomiary Automatyka Robotyka

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2009

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R. 13, nr 2

727-731

PL

W pracy zaprezentowano wykorzystanie piezoelektrycznych czujników ciśnień do pomiaru nacisków w ośrodkach rozdrobnionych, w szczególności do pomiaru nacisków w masach formierskich. Aby zapewnić bezkierunkowy pomiar ciśnień w ośrodkach rozdrobnionych czujnik musi być wyposażony w bezinercyjny adaptor cieczowy, umożliwiający bezinercyjny i bezkierunkowy pomiar. Wyniki pomiarów nacisków, w procesie dynamicznego zagęszczania mas formierskich, można wykorzystać do eksperymentalnej weryfikacji opracowanego przestrzennego modelu matematycznego procesu dynamicznego zagęszczania i deformacji masy formierskiej. Wyniki te mogą również służyć określaniu wytrzymałości formy.

EN

Application of a piezoelectric sensor for pressure measurement in disintegrated medium (e.g. moulding sand) has been presented. For non-directional pressure measurement in disintegrated medium, a piezoelectric sensor must be equipped with intertialess liquid adaptor. Results of pressure measurement during dynamic moulding sand densening process can be used for experimental verification of formulated mathematical model of dynamic densening and deformation of moulding sand. These results can be useful in determining mould’s strength.

2

Signalling a foundry mould filling degree with infrared sensors

Bogdan M., Fita S., Mikulczyński T., Ciskowski S.

Archives of Foundry Engineering

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2008

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Vol. 8, iss. 2

9-12

EN

A contactless method of measuring a foundry mould filling degree in course of its pouring with liquid metal is suggested. The concept is based on infrared radiation of molten metal appearing in venting and flow-off holes. As the detector, an infrared channel receiving diode is applied. Three solutions were tested. In the first solution, the diode is placed at the calculated distance from the radiation source, in a housing that suppresses the scattered signal. The housing contains the electronics, while power supply and control signals are delivered by conductors. A diode actuation threshold is established in order to obtain high resolution and repeatability of the results. On the output, a miniature relay transmits the signal to the control system. In the second solution, the measuring system is supplied with a battery and the signal in transmitted through a plastic optical fibre. In the third solution, the optical fibre serves as an energy carrier. The optical system focuses the infrared radiation and introduces the energy to the optical fibre. On the other end of the fibre, a phototransistor amplifies the signal, forms it and transmits to the control system. Some experiments were carried out. Their results permitted noting disadvantages and advantages of individual solutions. It was evidenced that the measurement results obtained using the infrared radiation are independent on a constructional design. The solutions utilising optical fibres proved to be more useful in industrial conditions. Targets and further directions of research works using transceivers for wireless data transmission are presented.

3

Selected applications of ultrasonic method for moulding sand examination

Ciskowski S., Fita S., Mikulczyński T., Nowicki J.

Archives of Foundry Engineering

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2007

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Vol. 7, iss. 2

101-106

EN

Selected applications of ultrasonic method for examining basic technological and rheological properties of traditional moulding sands are presented. The ultrasonic method permits evaluation of basic technological properties of moulding sands on the grounds of the correlation curves t = f(W), Rcw = f(E) and L = f(kC ,W). This allows also determining the kC and kT coefficients which define viscoelastic properties of moulding sands based on the relationships kC = f(vL) and kT = f(vL).