TitleDestruction of Moulding Sands with Chemical Binders Caused by the Thermal Radiation of Liquid Metal
Journal titleArchives of Foundry Engineering
KeywordsSand moulds ; Thermal destruction ; Radiation ; Heating of moulds ; Loss of strength
Divisions of PASNauki Techniczne
Archives of Foundry Engineering continues the publishing activity started by Foundry Commission of the Polish Academy of Sciences (PAN) in Katowice in 1978. The initiator of it was the first Chairman Professor Dr Eng. Wacław Sakwa – Corresponding Member of PAN, Honorary Doctor of Czestochowa University of Technology and Silesian University of Technology. This periodical first name was „Solidification of Metals and Alloys” , and made possible to publish the results of works achieved in the field of the Basic Problems Research Cooperation. The subject of publications was related to the title of the periodical and concerned widely understand problems of metals and alloys crystallization in a casting mold. In 1978-2000 the 44 issues have been published. Since 2001 the Foundry Commission has had patronage of the annually published “Archives of Foundry” and since 2007 quarterly published “Archives of Foundry Engineering”. Thematic scope includes scientific issues of foundry industry:
- Theoretical Aspects of Casting Processes,
- Innovative Foundry Technologies and Materials,
- Foundry Processes Computer Aiding,
- Mechanization, Automation and Robotics in Foundry,
- Transport Systems in Foundry,
- Castings Quality Management,
- Environmental Protection.
The obtained results of heating of sand moulds with binders by means of a thermal radiation of liquid metal are presented in this study.
Standard samples for measuring Rg made of the tested moulding sands were suspended at the lower part of the cover which was covering
the crucible with liquid metal (cast iron), placed in the induction furnace. The authors own methodology was applied in investigations. The
progressing of the samples surface layers heating process was determined as the heating time function. Samples of a few kinds of
moulding sands with chemical binders were tested. Samples without protective coatings as well as samples with such coatings were tested.
The influence of the thermal radiation on bending resistance of samples after their cooling was estimated. The influence of several
parameters such as: time of heating, distance from the metal surface, metal temperature, application of coatings, were tested. A very fast
loss of strength of moulding sands with organic binders was found, especially in cases when the distance between metal and sample
surfaces was small and equaled to 10÷15 mm. Then, already after app. 15 seconds of the radiation (at Tmet=1400o
C), the resistance
decreases by nearly 70%. Generally, moulding sands with organic binders are losing their strength very fast, while moulding sands with
water glass at first increase their strength and later slightly lose. The deposition of protective coatings increases the strength of the mould
surface layers, however does not allow to retain this strength after the metal thermal radiation.
PublisherThe Katowice Branch of the Polish Academy of Sciences
Date2015[2015.01.01 AD - 2015.12.31 AD]
TypeArtykuły / Articles