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Kinetics of the Binding Process of Furan Moulding Sands, Under Conditions of Forced Air Flow, Monitored by the Ultrasonic Technique

Matonis Natalia, Zych Jerzy

Archives of Foundry Engineering

2023

Vol. 23, iss. 4

93--98

The paper presents the results of research on the kinetics of the binding process of self-hardening moulding sands with an organic binder under conditions of forced air flow at various pressure values. Three moulding sands made using urea-furfuryl resin Furanol FR75A technology were studied. The moulding sands were prepared on a base of quartz sand with an average grain size of dL = 0.25, 0.29 and 0.37 mm, with permeability values of 306, 391 and 476 m2108Pa x s (for ρo = 1.60, 1.60 and 1.61 g/cm3 , respectively). The research was conducted for a resin content of 1% with a constant proportion of hardener to resin, which was equal to 50%. Samples of the tested moulding sands were blown with air at pressures of 0.1, 0.2, 0.4, 0.6, 0.8, and 1.0 bar. The kinetics of the hardening process was monitored using ultrasound technology, according to a previously developed methodology [1]. The research was carried out on an ultrasound testing station equipped with a temperature chamber and an airflow reducer. The tests were conducted at a temperature of 20°C, and of the air flow pressure on the changes in ultrasonic wave velocity in the hardening mouldins sand as a function of time, the kinetics of the hardening process, and the degree of moulding sand hardening were determined. Additionally, the influence of the moulding sand permeability on the course of the hardening process at a constant air flow pressure was determined.

Badanie kinetyki wiązania mas formierskich ze spoiwami chemicznymi

Zych J.

Archiwum Odlewnictwa

2001

R. 1, nr 2

586--593

W pracy przedstawiono wyniki badań kinetyki utwardzania mas ze spoiwami chemicznymi. Badania prowadzono opracowaną przez autora metodą ultradźwiękową. Prędkość fali ultradźwiękowej w masach ze spoiwami zależy od stopnia ich utwardzenia i zmienia się w zakresie od 500 do 2500m/s. Wykorzystując opisaną metodę oceniono wpływ temperatury i składu spoiwa na kinetykę utwardzania wybranej, furanowej masy.

In this work there are presented results of measuring the kinetics of setting of chemical bonded moulding sand, tested by ultrasonic method. In this work the original method of mould sand estimation has been elaborated. This method bases on measurements of the selected parameters of ultrasonic waves. The velocity of ultrasonic waves in this moulding sand is dependent on degree of hardening and changes in wide range (500- 2500 m/s, sometimes more.) The method enables estimation of kinetics of setting and can be employed in the practice.