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Aplicação da metodologia DFMA - Design for Manufacturing and Assembly - no projeto e fabricação de aeronaves; Application of DFMA - Design for Manufacturing and Assembly - methodology on aircrafts design and manufacturing

Barbosa, Gustavo Franco
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 23/10/2007 PT
Relevância na Pesquisa
45.85%
A indústria aeronáutica no Brasil tem se desenvolvido de modo acelerado em termos de desenvolvimento tecnológico e dos processos de fabricação aplicados. Com isso, tem se buscado melhores resultados durante o desenvolvimento do projeto e fabricação de aeronaves, visando uma melhor avaliação dos processos de fabricação, montagem, manutenção, confiabilidade e fatores humanos (ergonômicos). O intuito é aperfeiçoar a fabricação e simplificação da montagem dos conjuntos, de modo a facilitar a manufatura dos componentes que formarão o produto depois de acabado e tornar a montagem dos produtos aeronáuticos com o menor custo e da forma mais otimizada possível. Sendo assim, este trabalho visa o desenvolvimento de uma ferramenta que utiliza os conceitos de DFMA para aplicação específica no projeto e fabricação de aeronaves. O objetivo da ferramenta é auxiliar os engenheiros que atuam nas fases de desenvolvimento do avião, para que benefícios de facilidade de montagem possam ser alcançados com a utilização dos quadros de verificações. O trabalho inicia-se com a história da aviação, da indústria aeronáutica no mundo e no Brasil, e uma revisão teórica dos conceitos e princípios da metodologia DFMA. Em seguida é apresentado o ambiente da indústria aeronáutica...

Desenvolvimento de método de avaliação de desempenho de processos de manufatura considerando parâmetros de sustentabilidade; Development of a method for manufacturing processes assessment considering sustainability parameters

Araujo, Juliano Bezerra de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 15/01/2010 PT
Relevância na Pesquisa
55.85%
As empresas não mais podem pensar em desenvolvimento econômico sem a paralela preservação do meio-ambiente e do benefício mútuo da sociedade. É importante que as condições econômicas e sociais sejam melhoradas ao longo do tempo, sem exceder a capacidade de suporte do planeta. As indústrias podem contribuir para melhorar esse cenário aplicando uma gestão sustentável de manufatura, uma vez que estes são um dos principais agentes causadores de impactos. No entanto, para que consigam aprimorar a sustentabilidade de seus processos, é indispensável, antes de tudo, conhecer o seu real desempenho. O presente trabalho tem como objetivo principal desenvolver um método estruturado e simples para a avaliação de desempenho em sustentabilidade de processos de manufatura, permitindo a construção de relatórios de sustentabilidade mais precisos, periódicos e que venham a apoiar o processo de tomada de decisão gerencial. Embora modelos para a avaliação de desempenho em sustentabilidade tenham sido apresentados nos últimos anos, como o guia GRI, estes ainda carecem de critérios e regras para realizar análises mais precisas e integradas. O método proposto pode ser aplicado em dois processos de manufatura distintos, comprovando a sua eficácia e robustez. Ele é usado para analisar e comparar o desempenho em sustentabilidade de dois processos de usinagem...

PLM2M: modelo colaborativo para planejamento e gerenciamento de processos de manufatura & gerenciamento de portfólio; PLM2M: collaborative model for manufacturing processes planning and management & portfolio management

Gama, Evandro Bertoni da
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 18/11/2014 PT
Relevância na Pesquisa
65.91%
A partir dos anos 2000 houve uma significativa mudança no cenário global da manufatura, no sentido de induzir as empresas a trabalhar dentro de ambientes colaborativos, os quais necessitam de soluções mais integradas ao 'modelo de empresa estendida' para colaborar a organização como um todo, incluindo parceiros, fornecedores e clientes. Na atualidade, as atividades de planejamento e gerenciamento dos processos de manufatura necessitam levar em consideração a dispersão de recursos (do ponto de vista sistema), que engloba inclusive o conhecimento e a informação. Um problema de grande importância está na 'conexão' (interface) entre as engenharias, os ambientes de produção e os ambientes de operações comerciais, principalmente na precisão do compartilhamento de dados. Como proposta de solução deste problema a pesquisa tem como contribuição a criação do modelo de referência denominado PLM2M (PLM to Manufacturing), suportado pelas iniciativas da manufatura digital DM (Digital Manufacturing) do PLM (Product Lifecycle Management), que envolvem 'simulação' e 'procedimentos colaborativos', principalmente para as atividades de planejamento e gerenciamento de processos de manufatura, consideradas o 'elo' entre o desenvolvimento de produtos...

Development of a robust work transfer iomplementation process

Murdoch, Kimberly R
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 130 p.; 7077597 bytes; 7077406 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
45.83%
The industry-wide need for a robust method of transferring the manufacturing of a component from one location to another is addressed in this thesis. Work transfer activities can be initiated due to a number of business reasons. These reasons include: reducing general operating costs, increasing asset utilization, and reducing overhead costs by leveraging manufacturing synergies. However, in order to fully realize the benefits of a work transfer activity, a robust work transfer process is needed to mitigate the risks associated with work transfer activities. In this thesis, the work transfer process is studied with specific concentration on the implementation phase of the work transfer. The overall objective is to propose and document a robust work transfer implementation process that improves the reliability with which work transfers are executed. The current work transfer process at The Boeing Company, in addition to the strategic and business decisions that initiate work transfers and the selection of manufacturing processes and technologies, serve as the starting point of the work and associated considerations. In developing this recommended work transfer process, robustness was addressed as the risks associated with the implementation of work transfer activities and subsequent risk mitigation activities were identified...

Centralization of manufacturing processes at a major automotive OEM

Kornick, Adam Marcus, 1974-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 75 p.; 2871719 bytes; 2871527 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
65.85%
Ford is moving from decentralized control of manufacturing processes to centralized control. Prior to this centralization effort, product development occurred as a central function, but individual plants were largely allowed to select vendors, machine tools, suppliers, etc. for production without central oversight (other than accounting and cost control). Ford has now formed a group, manufacturing engineering, within powertrain operations (PTO), as well as analogous groups in other business units, to standardize and centralize these functions for the production of engines and transmissions. To date, the group has formally centralized machine design and purchasing with some success and a fair amount of upheaval in the daily tasks of on- site launch team members. Two technical aspects of this shift are examined, beginning with higher communication costs. These costs are the time and effort spent relaying information to understand and select a course of action for a production network rather than a course of action for a single plant. Communication costs for Ford are shown to increase with the number of plants or platforms involved in a product or process decision. After evaluating these delays, methods to improve communication costs by modifying individual responsibilities as well as methods used by other centralized manufacturers are discussed. In addition to modifying communication across the production network...

Decision support systems for tool reuse and EOL processes

Gan, Jyeh J
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 69 p.
ENG
Relevância na Pesquisa
55.79%
Intel® is a manufacturing company that concentrates on the fabrication process of computer chips. Over the years and into the future, Intel® has gone through multiple and advanced generations of manufacturing technology caused by new fabrication techniques and increased wafer sizes. These advances have resulted in significant opportunities for cost reduction which includes reuse of semiconductor equipment within Intel factories and sale of used semiconductor equipment. To ensure assets are transferred in a safe and timely manner, Intel developed a 6D program (Decontamination, Decommission, Demolition, Demolition-System, Delivery, and Deployment) to standardize the EOL (End of Life) process of transferring a tool from the factory to its final destination in reuse, sale, parts harvesting, donation or scrap. Like other multi-national companies, Intel® has decentralized manufacturing processes over multiple worldwide sites; most if not all the fabrication, sort, and assembly tool information is archived in multiple repositories/systems. In addition to the scattering of knowledge, the tool-related information appears not to be comprehensive, including data fields not matching across multiple systems.; (cont.) As a result, significant time is consumed to ensure the comprehensiveness and the accuracy of the required data across the multiple sites. Thus a comprehensive map of information infrastructure based on the 6D process is necessary to understand and enhance efficiencies in the knowledge flow process. Detailed mapping of databases and their meta-data will help identify the thoroughness...

Innovation enabling manufacturing processes

Lu, Ilyssa Jing
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 63 p.
ENG
Relevância na Pesquisa
55.74%
Global operations for multinational companies today pose a particularly challenging environment for maintaining fluid knowledge transfer and effective communication methodologies. In a continuous drive for product innovation, process development often takes on lower priority to other initiatives that directly affect the design and delivery of a product. However, existing literature shows that process development and governance are critical to sustainable growth in the global marketplace. Multinational companies must recognize the need to integrate process development in a product centric enterprise to maintain effective information flow and clear communication channels. Cisco faces this challenging in maintaining effective cross-functional communication while growing through acquisition and new product developments. Cisco also faces additional complexity in managing a global network of outsourced manufacturing activities. This research analyzes two case studies in process development within the Manufacturing organization at Cisco. Specifically, these two case studies focus on driving early engagement of manufacturing concerns in the product lifecycle and effective means of facilitating this initiative.; by Ilyssa Jing Lu.; Thesis (M.B.A.)--Massachusetts Institute of Technology...

Implementation of the new FDA quality by design guidance in pharmaceutical production; Implementation of the new Food and Drug Administration QbD guidance in pharmaceutical production

Tozer, Stephanie Michelle
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 110 p.
ENG
Relevância na Pesquisa
45.82%
Due to the highly regulated environment, it is difficult to implement changes to a pharmaceutical process. Even small change request approvals can require months of effort for pharmaceutical companies and regulatory agencies. This resource intensive process discourages continuous improvement and often results in outdated and inefficient manufacturing processes. In response to the growing need for improvement, the FDA issued a guidance to industry that provides a framework for acquiring improved process understanding and product quality in the manufacturing industry. The guidance is aimed at encouraging the use of process analytical technology (PAT) to monitor key quality attributes continuously during the process and enable early fault detection. The goal is to transition from the current method of quality through end of process testing to a new method of quality by design (QbD). In 2005 Novartis Pharma formed a unique collaboration with the FDA in an attempt to demonstrate the benefits and concepts of QbD. A cross-functional team was formed with the goal of developing a case study for one Novartis process that will serve as a model for future implementation of PAT and QbD.During a six month internship, I worked with the Global PAT team members to help ensure the successful implementation of the QbD tools outlined in the FDA Guidance. The internship focused only on the drug substance manufacturing process. Specifically...

(Value, Risk)-based Performance Evaluation of Manufacturing Processes

SHAH, Liaqat; ETIENNE, Alain; SIADAT, Ali; VERNADAT, François
Fonte: Arts et Métiers ParisTech Publicador: Arts et Métiers ParisTech
EN
Relevância na Pesquisa
65.85%
A value/risk -based performance evaluation framework is proposed in the context of manufacturing processes at the industrialization phase of product development. Various risk factors of the manufacturing process are identified through Failure Mode and Effect Analysis (FMEA) and then embedded in the process plan models. Modelling and simulation are then employed for determining the value a process plan can create and the risk it is exposed to. Alternative scenarios are developed, simulated and compared with a reference scenario. The methodology is illustrated with a case study issued from parts manufacturing but is applicable to a wide range of other processes.

Design and manufacturing interface modelling for manufacturing processes selection and knowledge synthesis in design

SKANDER, Achraf; ROUCOULES, Lionel; KLEIN MEYER, Jean-Sébastien
Fonte: Springer Publicador: Springer
EN
Relevância na Pesquisa
55.86%
This research is part of the regional French project IFP2R : “ Manufacturing constraints integration in rapid prototyped part design ” with IFTS (Higher Technical Formation Institute of Charleville Mézières- France).; The research results presented in this paper are related to the specification of a method and models that tackle the problem of manufacturing processes selection and the integration, as soon as possible, of their constraints in the product modelling (i.e. information synthesis). This method is based on a skin and skeleton design/manufacturing interface model that ensures connection between design and manufacturing information. The use of these features is justified by their capacity to make a product representation which allows integration of both design and manufacture data and therefore assists the product breakdown definition (including the 3D forms) by least commitment. This method first analyses the product data issued from functional analysis and component selection (form, roughness, tolerance interval, etc.). Then, it deals with manufacturing information (manufacturing processes constraints). The approach is formalised with IDEF and UML models and has been consolidated with software developments based on C++ and open CASCADE technologies.

Energy and Material Flow Analysis of Binder-jetting Additive Manufacturing Processes

METEYER, Simon; XU, Xin; PERRY, Nicolas; ZHAO, Yaoyao Fiona
Fonte: Elsevier Publicador: Elsevier
FR
Relevância na Pesquisa
55.83%
Proceeding to 21st CIRP Conference on Life Cycle Engineering; Manufacturing, where great amount of energy and materials are being consumed, should take response to have cleaner production and to improve its sustainability. Additive manufacturing (AM) technology shows potential to reduce environment impact as a more sustainable manufacturing method; however, the lack of well documented energy consumption and material flow data limits the development of Life-Cycle Inventory (LCI) analysis of AM technology. This paper presents an energy and material consumption model of Binder-Jetting (BJ) process. A Unit-Process (UP) level model is created and validated by experimental data to provide LCI data for further Life-Cycle Analysis (LCA) of BJ additive manufacturing processes. The accurate process model provides a tool to industry to understand the energy consumption and material efficiency aspect of the binder-jetting process and to allow comparisons with traditional processes.; EcoSD network

A Manufacturing Informatics Framework for Manufacturing Sustainability Assessment. In : Re-engineering Manufacturing for Sustainability, Springer

ZHAO, Yaoyao Fiona; PERRY, Nicolas; ANDRIANKAJA, Hery
Fonte: Springer; Springer Publicador: Springer; Springer
EN
Relevância na Pesquisa
45.83%
Manufacturing firms that wish to improve their environmental performance of their product, process, and systems are faced with a complex task because manufacturing systems are very complex and they come in many forms and life expectancies. To achieve desired product functionalities, different design and material can be selected; thus the corresponding manufacturing processes are also changed accordingly. There is direct need of assessment tools to monitor and estimate environmental impact generated by different types of manufacturing processes. This research proposes a manufacturing informatics framework for the assessment of manufacturing sustainability. An EXPRESS information model is developed to represent sustainability information such as sustainability indicators and their associated weighting and uncertainty factors, material declaration information, and hazardous condition information, etc. This information model is tested with industrial products to validate its completeness and correctness. This information model serves as the first step of establishing close association of sustainability information with product design specification. In the next phase of research...

Cycle-to-cycle control of multiple input-multiple output manufacturing processes

Rzepniewski, Adam K. (Adam Kamil), 1976-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 221 leaves; 10252034 bytes; 10265832 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
45.83%
In-process closed-loop control of many manufacturing processes is impractical owing to the impossibility or the prohibitively high cost of placing sensors and actuators necessary for in-process control. Such processes are usually left to statistical process control methods, which only identify problems without specifying solutions. In this thesis, we look at a particular kind of manufacturing process control, cycle-to-cycle control. This type of control is similar to the better known run-by-run control. However, it is developed from a different point of view allowing easy analysis of the process' transient closed-loop behavior due to changes in the target value or to output disturbances. Both types are methods for using feedback to improve product quality for processes that are inaccessible within a single processing cycle but can be changed between cycles. Through rigorous redevelopment of the control equations, we show these methods are identical in their response to output disturbances, but different in their response to changes in the target specification. Next, we extend these SISO results to multiple input-multiple output processes. Gain selection, stability, and process variance amplification results are developed. Then, the limitation of imperfect knowledge of the plant model is imposed. This is consistent with manufacturing environments that require minimal cost and number of tests in determining a valid process model. The effects of this limitation on system performance and stability are discussed. To minimize the number of pre-production experiments...

Batch sizing strategy & production load leveling in a multi-step chemical manufacturing process; Batch sizing strategy and production load leveling in a multi-step chemical manufacturing process

Mazariegos, Carlos
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 117 p.; 6862879 bytes; 6867744 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
55.83%
In the last couple of years Eastman Kodak Company went through major changes in its strategic direction. The same disruptive technologies that they helped develop for digital imaging have shaped a new industry, and the market requirements and preferences for photography have changed dramatically. Some of the tightly held complementary assets that gave Kodak a competitive advantage are no longer as critical as were in the past. Kodak management has set a very strong emphasis on running a lean operation. At the same time, executive management has set very aggressive targets for inventory reduction and productivity increase in the manufacturing units. Demand for chemicals used in film and paper for silver halide-based photography has steadily decreased in the last decade. There is growing pressure to increase inventory turns in production processes that are not as profitable as they were ten to twenty years ago. Management is faced with the need to implement aggressive tactics that minimize inventories and lower costs. Continuous batch size reduction is one of the lean manufacturing principles that manufacturers of discrete parts have successfully used to drive operational improvements and that Kodak is pursuing as well. This thesis takes a closer look at the differences between discrete and batch chemical manufacturers. It describes the considerations and real challenges in analyzing batch sizing decisions for chemical plants that have been operating for several years. In general...

Re-sourcing manufacturing processes in metal forming operations

Holtz, Heath M. (Heath Mikal)
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 76 p.; 3779787 bytes; 3782891 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
65.89%
Deciding which activities to conduct in-house and which to outsource has become increasingly important due to its implications on a company's supply chain and overall business model. A number of factors can lead a company to outsource manufacturing processes. As a result of this outsourcing, the supply chain can become very complex and overwhelming to manage. This thesis will analyze this situation from the perspective of one manufacturer, American Axle and Manufacturing, Inc. (AAM). AAM's Metal Formed Products (MFP) Division currently has a number of challenges: rising steel prices, fixed labor costs and declining sales. All these factors have significantly impacted profitability, forcing senior management to take a comprehensive look at the division and consider developing a plan to improve divisional operations. As a part of this plan, MFP Division's senior management asked for a thorough look into all of the manufacturing processes performed by the division both internally and by outside suppliers. In addition to identifying the processes and suppliers, senior management sought to highlight opportunities for improving the process flow through the re-sourcing of manufacturing processes. This project develops a framework to analyze and evaluate these re-sourcing decisions. This framework employs a five-step approach and incorporates a number of diverse analytical tools. Process flow mapping provided a tool to visually highlight the best opportunities to resource. In addition to a visual representation...

Implementation of lean processes at a high-mix low-volume aerospace manufacturing facility in France

Hurd, A.-P. (Annie-Pierre), 1974-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 104 p.; 7702228 bytes; 7714246 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
45.86%
The theories of the Toyota Production System have been operational touchstones now for over twenty years in North America and Western Europe. In spite of this many companies, particularly those in high-mix low-volume manufacturing, continue to struggle with their implementation. The goal of this thesis is to openly examine the fit of the Lean tradition with the realities of complex high-mix low-volume processes and pave the way for improvements. This thesis explores the implementation of Lean processes at Jodd-Thonson's aerospace manufacturing facility, Daugy-Naudier, in France. The work is divided into two parts: 1. Implementation of Lean manufacturing principles in the Actuator assembly and machining department and benchmarking of challenges with other LFM Lean projects at other high-mix, low-volume manufacturers, 2. Implementation of a process to evaluate the cost and return on engineering changes as well as improvement to the change management process. Through the analysis of case studies, this thesis questions the relevance of some widely accepted Lean tools in the context of complex high-mix low-volume environments. I develop a set of hypotheses about risk factors and solutions particular to high-mix-low-volume Lean implementations. The combination of strategic and tactical projects examined in this thesis shows that implementing Lean in high-mix low-volume is necessarily an enterprise-wide process. Its success depends on developing a Lean culture that can successfully leverage distributed...

Improving maintenance work flow processes in a volatile assembly factory environment : maintenance people and processes, spares inventory, and equipment reliability

Chase, H. Ryan (Harold Ryan)
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 45 p.; 3438668 bytes; 3440450 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
45.83%
Many manufacturing companies face significant challenges in maintaining their factory equipment in a cost efficient manner so as to provide reliable production capacity. CEI (Consumer Electronics, Inc., a pseudonym for an electronics marketing, sales, and assembly company that this work is based on) is no exception. The factory maintenance organization at CEI, similar to many other companies, had been relegated to the status of necessary evil, a cost center that was necessary but not always effective or efficient. Historically, the maintenance organization had been almost entirely reactive in its approach to maintenance. This study reviews many ideas for how CEI could, consistent with management objectives, become more proactive in its approach to maintenance. This work presents an investigation into the work flow processes inherent in CEI's factory maintenance organization and suggests improvements to the processes and the software infrastructure to support those processes that might be appropriate. Specifically the reactive (emergency) and preventative maintenance work processes are analyzed and suggestions to improve data integrity and to improve communication are presented - providing the maintenance technicians with better information with which to do their jobs.; (cont.) Improvements for factory spare parts management are also suggested describing how CEI could potentially improve its fill rate while holding significantly less inventory. The role of equipment analysis technology and materials analysis in predicting equipment reliability is also discussed.; by H. Ryan Chase.; Thesis (S.M.)--Massachusetts Institute of Technology...

Implementation of a manufacturing process platform

Ging, Justin D. (Justin Daniel), 1976-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 55 p.; 2746760 bytes; 2748968 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
55.77%
As companies grow and innovate, they offer an increasing number of products. Product proliferation must be managed through a product development process, which is supported by key competencies of the company in the form of platforms. Product and technology platforms have been essential to the success of innovative companies. By leveraging core abilities, companies are able to bring products to market faster and at a lower cost for quality. In this research I present the concept of a manufacturing process platform and a framework for identifying and institutionalizing the platform. I present a case study of a manufacturing group in Eastman Kodak Company which has performed analysis of manufacturing processes and is attempting to implement a manufacturing process platform. Research for this thesis was conducted during a six and a half month internship with Eastman Kodak Company's High Performance Imaging Systems Manufacturing group in Rochester, NY. The internship was affiliated with the Massachusetts Institute of Technology's Leaders for Manufacturing Program.; by Justin Ging.; Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering; and, (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; in conjunction with the Leaders for Manufacturing Program at MIT...

Manufacturing at double the speed

Allwood, Julian Mark; Childs, Tom H.; Clare, Adam T.; DeSilva, Anjali K.; Dhokia, Vimal; Hutchings, Ian M.; Leach, Richard K.; Leal-Ayala, David R.; Lowth, Stewart; Majewski, Candice E.; Marzano, Adelaide; Mehnen, J?rn; Nassehi, Aydin; Ozturk, Erdem; Raff
Fonte: Elsevier Publicador: Elsevier
Tipo: Article; published version
EN
Relevância na Pesquisa
45.86%
This is the final version of the article. It first appeared from Elsevier via http://dx.doi.org/10.1016/j.jmatprotec.2015.10.028; The speed of manufacturing processes today depends on a trade-off between the physical processes of production, the wider system that allows these processes to operate and the co-ordination of a supply chain in the pursuit of meeting customer needs. Could the speed of this activity be doubled? This paper explores this hypothetical question, starting with examination of a diverse set of case studies spanning the activities of manufacturing. This reveals that the constraints on increasing manufacturing speed have some common themes, and several of these are examined in more detail, to identify absolute limits to performance. The physical processes of production are constrained by factors such as machine stiffness, actuator acceleration, heat transfer and the delivery of fluids, and for each of these, a simplified model is used to analyse the gap between current and limiting performance. The wider systems of production require the co-ordination of resources and push at the limits of human biophysical and cognitive limits. Evidence about these is explored and related to current practice. Out of this discussion...

The use of manufacturing commands and features in a CAD interface to familiarize engineering students with manufacturing equipment and processes capabilities

Castro-Cedeno, Mario
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Conferência ou Objeto de Conferência Formato: 159664 bytes; 9901 bytes; 1931 bytes; 698 bytes; 5612 bytes; 49 bytes; 159664 bytes; application/pdf; text/plain; text/plain; application/octet-stream; application/octet-stream; application/octet-stream; application/pdf
EN_US
Relevância na Pesquisa
45.83%
Manufacturing features and commands such as cut, drill, mill, turn, etc. can be added to the interface of computer aided CAD software. The commands can be used to design simple to medium complexity parts by using commands in a way that resemble the creation of a manufacturing process plan. Students using the software can be introduced to the capabilities and relative advantages and disadvantages of manufacturing processes and equipment. The software can be used as an augmentation of conventional shop exercises where the students have to plan the steps needed to fabricate a part. This research describes some of the previous research on design and manufacturing features and provides examples of how manufacturing commands have been added to Solidworks CAD software.; Paper presented at the ASEE 2005 Annual Conference in Portland OR.