Percorrer por autor "Clemente, Miguel R."
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- Introducing flow architecture in the design and optimization of mold inserts cooling systemsPublication . Clemente, Miguel R.; Panão, Miguel R. OliveiraMold cooling is a critical phase of the molding cycle, comprising more than half of its total time. It affects the final quality of the plastic part and production rate. Therefore, the cooling channel system design is essential to achieve better control over the cycle time. Despite the improvements of conformal cooling, the flow configuration is still absent from cooling optimization criteria. In this work, using the constructal principle, we introduce in these criteria the flow systems svelteness as a global geometric design parameter expressing its architecture. In the configuration explored for cooling small-scale mold inserts, the flow enters through a primary channel and returns through secondary channels, equally spaced, similar to an umbrella shape. The evolution of flow configuration toward minimizing the flow resistance (local pressure losses) points to an architecture with smaller secondary channels and larger return angles. Depending on thermal requirements, it is possible to define optimal regions of interest presenting the cooling systems designer with an appropriate optional range.
- MICRO MOLD COOLING OPTIMIZATION USING A CONSTRUCTAL APPROACHPublication . Clemente, Miguel R.; Panão, Miguel R. OliveiraMold cooling is one of the most important phases in the molding cycle, comprising more than half of the total cycle time. This affects the final quality of the part and the production rate of the mold. Therefore, the design of a mold cooling channel system is essential to improve its thermal management and achieve a better control over the cycle time. The hardening of small thin wall plastic parts with complex geometries is one of the most challenging problems in the plastics injection industry, since we need to ensure quality, distortion free plastic parts. The solution lies in optimizing the cooling system, particularly the case of mold inserts with unconventional geometries compatible with the geometry of the part. Using the constructal principle, we develop a channel configuration as an umbrella for cooling a mold insert volume. This configuration includes a central channel transporting the coolant until the tip of the mold insert where a certain number of divergent channels depart performing the fluid flow return. A relation for the svelteness allows determining the channels sizes to ensure negligible local head losses, depending on the angle and number of divergent channels. Svelteness orientates the evolution of the flow towards smaller secondary channels returning the flow with higher divergent angles.
- Micro-cooling constructal design: An application to mold inserts thermal managementPublication . Clemente, Miguel R.; Panão, Miguel R.; Pascoal-Faria, Paula; Alves, NunoMold thermal performance has a direct influence on part properties, quality and defects, and mold productivity. Through additive manufacturing, inserts can be developed with features that respect the necessary high complex geometries the part requires and that increase thermal performance. Constructal design is explored as a design tool to produce guidelines for cooling channels development.