A RESOURCE-SAVING TECHNOLOGY OF MANUFACTURING GASIFIED MODELS FOR FOUNDRY MANUFACTURE
The method for processing foam polymer waste model production based on their reuse as an additive to the primary polystyrene foam in the manufacture of gasified models was presented. The properties of models made in the course of the experiment with a volume content of secondary granules from 0 to 50 % (surface quality, density, cross-sectional structure, strength) were analyzed. We noted a decrease in the density of the obtained gasified models and the time of sintering with an increase in the percentage of secondary granules. Basing on experimental data, a regression equation was obtained for the optimal time of manufacture of the gasified model, depending on the percentage of secondary granules, its density, wall thickness and coolant pressure. The limits of application of dependence for the control of the technological process are defined as follows: the working pressure of the coolant is 0,12-0,18 MPa, the wall thickness of the gasified model is 5-30 mm, the density is 20-30 kg/m3 with up to 50 % secondary granules. Basing on the regression equation, nomograms were constructed to determine the modes of production of gasified models with different contents of secondary granules by autoclaving, which clearly demonstrate that the sintering time of models decreases with increasing percentage of secondary polystyrene foam. The obtained results allow us to propose this method to be used within the framework of a single casting site as a promising resource-saving technology that significantly reduces the negative impact on the environment.