Pub Date : 2024-08-19DOI: 10.1007/s40962-024-01418-1
Deepak Chowdhary, V. Rahul, Nilanjan Banerjee
In a foundry, optimizing the charge mix is critical to achieving consistent quality, cost-efficiency, and desired qualities in the final metal or alloy product. This paper describes a data analytics-driven strategy for optimizing the charge mix by lowering the cost of the scrap used to prepare the molten metal while maintaining the required chemical composition, tensile strength, and hardness required by the foundry for manufacturing gray cast iron products (Grade FG 220). The linear programming approach is used for this purpose where all the constraints are strictly met. Three categories of constraints are used for this purpose, i.e., composition constraint, foundry constraint, and material grade constraint. In the linear programming approach, the feasible region is considered as an ellipsoidal region and the developed convex optimization problem is iteratively solved. The result showed potential cost savings could be obtained, accompanied by the needed alloy chemical composition and quality.
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Pub Date : 2024-08-19DOI: 10.1007/s40962-024-01440-3
Ferrufino-Rojas Juan-Manuel, Ruiz-Calleja Tamara
This research analyzes the technical feasibility of manufacturing jewelry castings using the lost wax technique, substituting wax by the use of resins within the framework of 3D stereolithography printers. To achieve this goal, a pair of distinct 3D ring designs have been crafted: a robust signet ring and an intricate filigree ring. The purpose behind this decision is to determine whether the unique features of these two different designs have any noticeable effect on the result. Five different commercial resins have been utilized, with one of them explicitly formulated for casting purposes. Non-castable resins generate a unique, weathered appearance, due to the variability in ash residue within the mold after resin combustion, yielding unpredictable outcomes and diverse sample characteristics such as grainy texture, cracks, and a corroded effect. Examining the castable resin reveals its optimal performance for smaller elements like the filigree ring, showcasing remnants of supports or layers originating from the resin's printer curing process. On the contrary, larger resin-abundant objects like the signet ring result in notable flaws, attributed to gas accumulation within the mold, exerting internal pressure and causing mold rupture, leading to metal leakage.