Products that are hollow or contain complex undercuts can be fabricated using the lost-core process as illustrated in Fig. 1.24.
Core materials are typically low-melting alloys (around 150°C), that are removed by heating the part. Before each molding cycle, a core is inserted into the mold, and the part is injection molded. The core is ejected with the part and then melted, resulting in the finished product. It is important that the core material melt at temperatures low enough that the plastic material is not affected by the heating cycle. Air manifolds for automotive and pump parts are often fabricated using this method.
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2 comments to "Lost-Core Process"
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