Influence of the Pression and Temperature in Dewaxing Stages of Investment Casting Parts
Abstract
In the investment casting process, is common that the manufactured parts present defects associated with the handling of materials, procedures, and control plans, which are often not standardized and can affect the quality requirements. The present study began with the selection of a group of ceramic shells used in the production of micro-casting parts; after verifying its defectology, we proceeded to reprocess and apply different values of temperature and pressure during the dewaxing course of the ceramic shell. The aim of this study was to verify the effect of these variables, analyzing the defects obtained in the parts manufactured by this process. For this virgin and reprocessed waxes used in the manufacture of the wax pattern were characterized showing that the use of reprocessed waxes can affect the quality of the ceramic shell and consequently of the parts obtained if there is not a control plan to prevent their contamination. It was determined that there is a direct relationship between temperature and pressure variations with the penetration and fluidity of the wax used in obtaining parts with fewer defects. Finally, the operative characteristics that gave the best response during the dewaxing process necessary to obtain ceramic molds were those related to the pressure of 120 psi and temperature of 170 °C, showing that these variables influence the process of obtaining ceramic molds and, consequently, with the quality of the investment casting parts.
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