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Author(s): P. V. Vasconcelos
F. Jorge Lino
R. J. Neto
Title: Importance of the vacuum in rapid tooling of polymeric-based moulds
Issue Date: 2004
Abstract: Metallic powders are typically mixed withepoxy and polyurethane resin systems to improvethe moulds thermal conductivity. The criticalproblem to produce these mixtures for RapidTooling applications is the difficulty of eliminatingthe entrapped air, introduced during theprocessing due to the high viscosity of the mixture,especially in the presence of high aluminiumconcentrations. When air bubbles are retained inthe resin/model interface, superficial defects aregenerated which render inoperative the RapidTooling moulds, and consequently the advantagesof these new technologies.In this work, a specific methodology ispresented to reduce the porosity level, not only inthese typical mixtures, but also in hybrid ones,manufactured with aluminium particles and milledfibres, which have a even worse tendency toproduce pores in the composite interface.
Subject: Engenharia mecânica, Engenharia mecânica
Mechanical engineering, Mechanical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia mecânica
Engineering and technology::Mechanical engineering
Source: RPD 2004
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: openAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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