Advanced Manufacturing Technologies

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Authors: Manuela Roxana Dijmărescu
Abstract: When dealing with a specific development issue, designers have at their disposal a wide range of skills and their implicit knowledge, enabling them to conceptualize the appropriate solution pertaining to the problem. In developing and applying these solutions, the efficiency of the designers is often dependent on their appropriate use of analysis and creativity skills, their experience, as well as the existing knowledge stored in the company or other accessible databases. This paper presents a case study on a containers transport mechanism in order to highlight the activities, used tools and the advantages considered for the functional design based on functional-constructive knowledge stored in databases as a main phase of a new advanced product design process.
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Authors: Giorgiana Elena Armasoiu
Abstract: There exists different feature definitions, but they all agree upon the point of view that considers features as high level entities. Solid models are built from features instances, which are designated as feature attributes, consisting of feature shape attributes, position and orientation of feature with respect to established coordinate system, material characteristics, geometric tolerances. The definition of manufacturing features links the ensemble of interrelated geometric elements to appropriate manufacturing method. This paper proposes a feature recognition algorithm that identifies features, such as simple hole, tapered hole, counterbored hole, counterdrilled hole, countersunk hole, step through/blind, slot through/blind, pocket through/blind, chamfer, fillet, filleted/chamfered slot, filleted/chamfered pocket, pocket/slot island or boss, based on a set of established definitions, with exemplification on slot features.
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Authors: Ștefan Cotescu
Abstract: This paper presents relevant data for a robust design of thermoplastic products, as a support for optimization of product design. The study emphasis rules and recommendations related to wall thickness and corner design through which the developer could anticipate quality problems that might appear in the product’s lifetime, avoiding design features that might be difficult to be produced or produced with a cost that may not be feasible.
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Authors: Oana Maria Manta Balas, Radu Balas, Cristian Vasile Doicin
Abstract: The aim of this article is to highlight the impact of the fuel movements inside the plastic fuel tank (waves) for the client perception of noise. Today there isn’t a clear methodology regarding the reproducing the fuel waves, but there are different approaches to be taken into account and also there is an innovative potential. Due to the fast technological progress the body in white and not only, the entire vehicle became lighter and lighted. A consequence of this great achievement is that the client can hear easier the sound produced by different components of the car. The plastic fuel tank can be considered such a component. The authors have done a deep analysis of present automotive fuel tanks and propose solutions for breaking the waves produced inside fuel tanks, so as to reduce the slosh noise effect. The studies will be continued during the doctoral approach of the first author.
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Authors: Ján Milde, Ladislav Morovič
Abstract: Dental restorations are currently produced mainly by conventional dental technology methods. The automation of the manufacturing process can be achieved by the use of CAD/CAM technology. Basic research on the most important aspects of CAD/CAM fixed dental restorations from the viewpoint of production, information technology, and dentistry/dental technology are the subject of a current article. The aim of this article is practical using of computer aided technologies such as 3D scanning and 5-axis machining for designing and fabrication of dental restorations. It further explains the detailed process of acquiring a digital description of tooth’s shape and its subsequent modification. Attention is drawn to a detailed analysis of dental restorations’ design obtained from a digital description of a tooth in Cercon Art software. The last part of this paper concentrates on the fabrication of dental restorations, which took place at CAD/CAM dental centre in Bratislava, Slovakia. The fabrication was accomplished by 5-axis kinematic structure of machine tools.
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Authors: Cătălin Gheorghiță, Vlad Gheorghiță
Abstract: Eco-audit is a tool to find the environmental impact of the product across all life cycle stages and for identify the problems in all aspects of a supply chain, from extraction of raw materials to manufacturing, distribution, use and disposal. The purpose of an analysis of a product is to establish the embodied energy, water usage, annual CO2 to atmosphere, carbon foot print, recycle fraction in current supply, toxicity, approximate processing energy and sustainability criteria. Knowledges to guide design decisions are needed to minimize or eliminate adverse eco-impacts. In eco-audit analysis, will be created material charts, processes selection and life cycle analysis allowing alternative design choices to meet the engineering requirements and reduce the environmental impact. The application presented in this paper uses only environmentally friendly properties of Ashby's database.
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Authors: Marius Adrian Constantin, Ana Boşneag, Monica Iordache, Claudiu Bădulescu, Eduard Niţu
Abstract: Friction Stir Spot Welding (FSSW) is a solid state joining process that relies on frictional heating and plastic deformation realized at the interaction between a non-consumable welding tool that rotates on the contact surfaces of the workpieces. Friction Stir Spot Welding (FSSW) is an evolving technique that has received considerable attention from automotive industries to replace electric resistance spot welding, which shows poor weldability for advanced high-strength steels as well as aluminium alloys. Because of the interest shown by the industry towards this process, an attempt to optimize it is imperative. But the experiments are often time consuming and costly. To overcome these problems, numerical analysis has frequently been used in the last years. The purpose of this paper is to develop a three-dimensional fully coupled thermal-stress finite element (FE) model of FSSW process for thin aluminium alloy Al 6061-T6. Numerical simulation being helpful for better understanding and observation of the influence of input parameters on the resulting phenomena. It is described the algorithm and are presented the activities needed to be performed in order to develop a valid numerical model for FSSW. The validation of the numerical model being achieved by comparing the resulted temperatures from the numerical simulation with the experimentally determined temperatures for the same material
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Authors: Constantin Adrian Popescu, Florin Adrian Nicolescu, Georgia Cezara Avram, Andrei Mario Ivan
Abstract: The paper presents the works performed by the authors in the field of AS/RS systems design and experimental small scale AS/RS physical model set-up for educational purposes. First part of the paper presents the virtual prototype of the 3D CAD model of the AS/RS system and the developing of the physical model set-up for an experimental small scale AS/RS for educational purposes. The specific hardware for control the AS/RS system and software for programming it are also included in a second part of the paper.
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Authors: Constantin Adrian Popescu, Florin Adrian Nicolescu, Georgia Cezara Avram, Adrian Theodor Mantea
Abstract: The paper presents the works performed by the authors in the field of AS/RS systems design and experimental small scale AS/RS physical model set-up for educational purposes. First part of the paper presents the virtual prototype of the 3D CAD model of the AS/RS system and the developing of the physical model set-up of an experimental small scale AS/RS for educational purposes. The specific hardware for control the AS/RS system and software for programming it are also included in a second part of the paper.
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