Advances in Manufacturing Systems

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Authors: A. García-Domínguez, Mariano Marcos Bárcena, I. Medina
Abstract: In order to study their current practices and improve on them, manufacturing firms need to view their processes from several viewpoints at various abstraction levels. Several notations have been developed for this purpose, such as Value Stream Mappings or IDEF models. Recently, the BPMN 2.0 standard from the Object Management Group has been proposed for modeling business processes. A process organizes several activities into a single higher-level entity, which can be reused elsewhere in the organization. Its potential for standardizing business interactions is well-known, but there is little work on using BPMN 2.0 to model manufacturing processes. In this work some of the previous notations are outlined and BPMN 2.0 is positioned among them after discussing it in more depth. Some guidelines on using BPMN 2.0 for manufacturing are offered, and its advantages and disadvantages in comparison with the other notations are presented.
Authors: L.P. Ferreira, E. Ares, G. Peláez, M. Marcos, M. Araújo
Abstract: This paper proposes a methodology to analyze complex manufacturing systems, based on discrete-event simulation models. The methodology was validated by performing different simulation experiments and will be applied to a multistage multiproduct production line, based on a real case, with a closed-loop network configuration of machines and intermediate buffers consisting of conveyors, which is very common in the automobile sector. A simulation model in an Arena environment was developed, which allowed for an analysis of the important aspects not yet studied in specialized literature, namely the assessment of the impact of the production sequence on the automobile assembly line. Various sequence rules were analyzed and the performance of each of the corresponding simulation models was registered.
Authors: F. Romero, G.M. Bruscas, J. Serrano
Abstract: This document presents a procedure for carrying out the step of selecting the locating surfaces and validating the setup, which is incorporated within a methodology for machining process planning that, unlike other classical approaches, deals with the problem from back to front. The procedure, which uses the typical tolerance graphs and tolerance transfer techniques based on the worst case, is applied first of all to the last setup from the alternative process plan that is being drawn up, and lastly it is applied to the first. This method allows us to consider the effects of the transmission of the variability among setups (machining stages) proposed by the multi-station variability models.
Authors: J. Ríos, F. Mas, J.L. Menéndez
Abstract: Assembly Line Balancing (ALB) comprises ordering of tasks among workstations to satisfy precedence constraints and objective functions. Due to the specific features of an aircraft, such approach is not fully suitable for the case of an aircraft Final Assembly Line (FAL). Where, the number of workstations relates to technological criteria rather than to a calculation aiming to minimize a specific parameter. Workload smoothing is addressed once the FAL configuration is defined. To improve current practices, a methodological approach was taken to address the conceptual modeling of an aircraft assembly line.
Authors: J. Serván, F. Mas, J.L. Menéndez, J. Ríos
Abstract: The assembly of components in the aerospace industry is currently supported by procedures based on work instructions. This documentation describes both the sequence of operations to be performed by operators and fundamental parameters of operation. However, sometimes difficulties arise, either by the difficulty of interpreting the information or because the process is too complex. This communication shows the results of the Project MOON (asseMbly Oriented authOring augmeNted reality) developed by AIRBUS Military. MOON uses 3D information from the industrial Digital Mock-Up to generate assembly instructions and their deployment by applying Augmented Reality technology. A prototype was developed for the electrical harness routing in the frame 36 of the AIRBUS A400M.
Authors: T. Karkoszka
Abstract: Audit, being a tool for nonconformities analysis, seems to be one of the main requirements for maintaining the management system in every organisation. It applies to every process independently on the size, complexity as well as character of the realised activities enabling the assessment of the correctness of the system solutions and indicating the guidelines and possibilities of their improvement.
Authors: Mikel Sorli, A. Sopelana, M. Salgado, G. Peláez, E. Ares
Abstract: Companies require tools to change towards a new way of developing and producing innovative products to be manufactured considering the economic, social and environmental impact along the product life cycle. Based on translating Lean principles in Product Development (PD) from the design stage and, along the entire product life cycle, it is aimed to address both sustainability and environmental issues. The drivers of sustainable culture within a lean PD have been identified and a baseline for future research on the development of appropriate tools and techniques has been provided. This research provide industry with a framework which balance environmental and sustainable factors with lean principles to be considered and incorporated from the beginning of product design and development covering the entire product lifecycle.
Authors: M.E. Peralta, Francisco Aguayo González, Juan Ramón Lama Ruiz
Abstract: The sustainability of manufacturing processes lies in industrial planning and productive activity. Industrial plants are characterized by the management of resource (inputs and outputs), processing and conversion processes, which usually are organized in a linear system. Good planning will optimize the manufacturing and promoting the quality of the industrial system. Cradle to Cradle is a new paradigm for engineering and sustainable manufacturing that integrates projects (industrial parks, manufacturing plants, systems and products) in a framework consistent with the environment, adapted to the society and technology and economically viable. To carry it out, we implement this paradigm in the MGE2 (Genomic Model of Eco-innovation and Eco-design), as a methodology for designing and developing products and manufacturing systems with an approach from the cradle to cradle.
Authors: F. Mas, J. Ríos, J.L. Menéndez
Abstract: During the conceptual design phase of a Final Assembly Line (FAL), the design solutions that will meet the functional and industrial requirements are defined, i.e.: the basic requirements of industrialization. During this phase, several alternatives are studied, and the most attractive in terms of performance and cost requirements is selected. As a result of the study of these alternatives, it is possible to define an early conceptual design of the assembly line and its basic parameters. The plant needs, long cycle jigs & tools or industrial means and human resources with the necessary skills can be determined in advance. This communication presents a case study focus on the FAL of the AIRBUS A400M.

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