The Analysis of the Relationship Between Silica Sand Molds Mixed with Waterglass and the CO2 Hardening Method on Product Defects
Keywords:
silica sand, waterglass, CO2, Molding, product defectAbstract
This study aims to analyze the effect of silica sand mold composition with waterglass and CO2 gas treatment on mold quality and the defect rate of products at PT. Kartika Alas Utama. The mold was made using a mixture of 150 kg of silica sand and 15 kg of waterglass (45% viscosity) and compacted with CO2 gas at a pressure of 20–30 Psi for 3 minutes. Testing was conducted through visual inspection and dimensional measurements to identify defects such as gas porosity, rough surface, and sand burn-on. The results showed that rough surface was the most dominant defect type, followed by gas porosity and sand burn-on. Improvements in mold quality can be achieved by controlling sand particle distribution, ensuring adequate ventilation, and regulating molten metal temperature. This study recommends optimizing production parameters to enhance mold quality, reduce defect rates, and provide practical solutions for the metal casting industry.
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