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TitleExperimental assessment of hybrid mould performance
Author(s)Pontes, A. J.
Queiros, Miguel P.
Martinho, P. G.
Bártolo, Paulo Jorge
Pouzada, A. S.
KeywordsHybrid mould
Moulding blocks
Injection moulding
Rapid tooling
Epoxy casting
Issue dateSep-2010
PublisherSpringer Verlag
JournalThe International Journal of Advanced Manufacturing Technology
Abstract(s)Hybrid moulds are a novel approach for rapid tooling of injection moulds that combines conventional machining for the mould structure and rapid prototyping techniques for the moulding blocks (core and cavity). In this study, two routes were used for producing the moulding blocks: selective laser sintering of stainless steel-based powder (hard tool) and epoxy resin vacuum casting (soft tool). The experimental work was based on a complex tridimensional commercial part. Themouldings were made in polypropylene, and the processing performance was monitored online in terms of pressure and temperature at the impression. The performance of the moulding blocks was analysed in terms of thermal and cycle performance and structural integrity. The epoxy tooling route is more adequate for fine detailing than selective laser sintering but is not adequate for parts with extensive ribs or deep bosses. The structural integrity of the less costly epoxy composite can be compromised during ejection, this suggesting the need to evaluate the stress field by simulation at the design stage of the mould.
Publisher version
AccessRestricted access (UMinho)
Appears in Collections:IPC - Artigos em revistas científicas internacionais com arbitragem

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