Influence the Composition of the Core Mixture to the Occurrence of Veinings on Castings of Cores Produced by Cold-Box-Amine Technology

Abstract

Influence the composItIon of the core mIxture to the occurrence of VeInIngs on castIngs of cores produced by cold-box-amIne technology the main problem in the cores production by cold-box method is the occurence of surface defects due to the tension generated by thermal expansion of the silica sand. one of the possibilities of eliminination is exchange of silica sand from another location. Another interesting factor is the type of used binder and its amount. However, even these measures donʹt guarantee sufficient quality. Foundries most often solve this problem by adding expensive additives to the core mixture. Foundries may have a dilemma in choosing the right additive. the aim of this paper was to investigate the effect of silica sand from two different locations, the effect of dosing the amount of binder and the addition of several types of commonly available additives on the quality of casting cavities. For this purpose, a total of 11 differently composed core sand mixtures were prepared, but only one of these mixtures was successful.

The Technique of Inorganic Core Sand Shooting with Reduced Pressure in Venting System

“…The currently available knowledge in the field of theory and practice of conventional blowing processes is based to a large extent on the previous work of a number of researchers who focused their research efforts to a greater extent on the technological aspects of the process and its application to the core materials of the time and to the research methods and measurement possibilities that existed at that time [1]. Publications from the last decade are evidence of great interest in both improving the technological side of the blowing process itself, as well as significant progress in the construction of blowing machines in response to the needs of the dynamic development of automotive technology and machine construction [3][4][5][6][7][8][9][10]. The monograph [2] contains a synthesis of practically the most up-to-date research on the blowing process and the following factors influencing its course:…”