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- International Conference on Quality, Innovation and Sustainability – ICQIS2020 - Book of AbstractsPublication . Pereira, Mário Rito; Simões, Fábio; Carlos Sá, José; Ferreira, Irene; Martinho, PedroThis book gathers the abstracts submitted and presented at the 2nd International Conference on Quality, Innovation and Sustainability, organized by the Polytechnic of Leiria and the Polytechnic Institute of Viana do Castelo on November 19 and 20, 2020. Abstracts are organized by session, and include keynote presentations, ordinary presentations and the poster session.
- Alternative materials in moulding elements of hybrid moulds: structural integrity and tribological aspectsPublication . Martinho, Pedro; Pouzada, António SérgioHybrid moulds are an increasingly considered alternative for prototype series or short production runs. This type of tools resorts on the use of Rapid Prototyping and Tooling (RPT) to produce the moulding elements (blocks or other inserts). This study was developed using a hybrid injection mould with exchangeable moulding elements that were produced by additive manufacturing (AM), namely vacuum epoxy casting, stereolithography and ProMetal. A full steel tool was also used as a reference. The processing conditions for the polypropylene moulded parts using the hybrid mould were monitored for pressure, temperature and ejection force. The hybrid mould performance was assessed in terms of pressure and temperature evolution during the injection cycle and the AM moulding elements for physical integrity. The data from the polypropylene moulded parts and the moulding inserts are compared with structural and rheological simulations using ANSYS Workbench and MOLDEX 3D. The results show that the hybrid mould performance and the structural integrity of the moulding elements depend on the properties of the materials used. The moulding shrinkage, when resin cores are used, is also affected by the core deformation caused by the injection pressure.