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- International Conference on Progress in Digital and Physical Manufacturing ProDPM'19 - Book of AbstractsPublication . Almeida, Henrique; Vasco, Joel; Marto, Anabela; Capela, Carlos; Freitas, Dino; Craveiro, Flávio; Bártolo, Helena; Coelho, Luís; Correia, Mário; Vieira, Milena; Ruben, RuiThe “Progress in Digital and Physical Manufacturing” book contains keynotes and papers presented at the first International Conference on Progress in Digital and Physical Manufacturing (ProDPM'19), organized by the School of Technology and Management (ESTG) of the Polytechnic Institute of Leiria (IPLeiria), from the 2nd to the 4th of October 2019. This international conference aims to provide a major international forum for the scientific exchange of multi-disciplinary and inter-organisational aspects performed by academics, researchers and industrial partners in order to exchange ideas in the field of digital and physical manufacturing and related areas. It represents a significant contribution to the current advances in industrial digital and physical manufacturing issues as it contains topical research in this field. The ProDPM'19 conference expects to foster networking and collaboration among participants to advance the knowledge and identify major trends in the field. The conference addresses to industrial challenges focused on current market demands and actual technological trends, such as mass customization, new business and industrial models or predictive engineering. Its contribution in science and technology developments leads to more suitable, effective and efficient products, materials and processes, generating added-value for the Industry and promoting the awareness of the role and importance of the digital and physical manufacturing development in the society. This book is, therefore, an essential reading for all of those working on digital and physical manufacturing, promoting better links between the academia and the industry. The conference papers will cover a wide range of important topics like additive manufacturing, biomanufacturing, advanced and smart manufacturing technologies, rapid tooling, microfabrication, virtual environments, simulation and 3D CAD and data acquisition, materials and collaborative design.
- Modelling the ejection friction in injection mouldingPublication . Correia, Mário SimõesThe quality of parts produced by injection moulding may be affected during the ejection stage of the moulding cycle. At this stage the parts are mechanically forced to separate from the moulding surfaces. The ejection force depends on the shrinkage of the polymer onto the core and on the friction properties of the contacting surfaces at the moment of extraction. As during moulding there is a replication of the part on the mould surface the ejection process is also dependent on the plastic deformation of the moulded material. Ejection takes place in a very short time, hence the static coefficient of friction must be considered for modelling the ejection process. To understand the contribution of the mechanisms involved in friction during the ejection stage, a mixed approach was developed: analytical simulation for the ploughing component, numerical simulation for the deformation mechanism, and an experimental inference for the adhesion. The study was based on the observation of three materials that are commonly used in injection mouldings: polypropylene, polycarbonate and a blend of polycarbonate/acrylonitrile- butadiene. The friction behaviour was studied with two testing methods: a prototype tester that is fitted to a universal testing machine, and an instrumented mould for the characterization of the friction force. The relevance of roughness, temperature and contact pressure on friction was evidenced, on the actual value of the static coefficient of friction that applies in the demoulding of thermoplastic mouldings.
- 12º Congresso Nacional de Mecânica Experimental - Livro de ResumosPublication . Capela, Carlos; Correia, Mário Simões; Ruben, Rui