Berlizeva T. Regulation of the strength of molds and cores in the stages of their technology use on the basis of the liquid-glass cold-mixes optimization

The object of study - the process of creating, preparing and using the new formulations of cold molding and core mixtures on a liquid glass with the universal additive of furfuryloxypropylcyclocarbonate to obtain high-quality castings in carbon and non-ferrous alloys. Purpose - the regulation strength of molds and cores in the stages of their technological use by establishing regularities of the influence on the properties of mixtures of additives that enhance the strength of molds and cores during cooking and contribute to softening of the mixture after pouring the metal and cooling, as well as the implementation of the technological process, which improves the quality of castings from carbon and non-ferrous alloys. Methods the study was based on the fundamental provisions of the theory and technology of foundry production with the use of mixtures on liquid glass. Physical-mechanical and technological properties of molding and core mixtures on the basis of liquid glass were carried out on standard methods using calibrated equipment and instruments. Scientific novelty. 1. A further development of the study of the dependency of increase of the compressive strength of the mixtures on quartz sand with liquid glass for moulds and cores from the composition and quantity of essential hardeners. 2. For the first time experimentally using the methods of multivariate optimization defined the rational part of cold-hardening mixtures on the basis of liquid glass with the use of special additives triacetin with furfuryl alcohol for cores. 3. For the first time the regularities of the effect of the number of universal supple-ments furfuryloxypropylcyclocarbonate in a mixture of quartz sand with liquid glass casting molds and cores on their properties (strength, vitality, attornet, gas permeability, fall). 4. First the optimal composition of cold compositions on the basis of chromite sand with liquid glass with the universal additive of furfuryloxypropylcyclocarbonate for facing and core mixtures. Practical significance of the obtained results. The compositions of the cold-hardening mixtures on the basis of universal supple-ments PEPCK tested and implemented in production environments for "Sumy scientific-production Association named. M. V. Frunze" (Sumy, the implementation act from 09.11.2012). Developed technological process implemented in the enterprise, "Orttech" (Kharkov, implementation act from 15.12.2013). Developments proposed in the thesis, are introduced in educational process on the specialty "Equipment and technology of foundry production" (implementation act from 24.12.2013.