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Viewing 1 to 30 of 220
Technical Paper
2014-09-16
Julian Lonfier, Côme De Castelbajac
Abstract As aircraft programs currently ramp up, productivity of assembly processes needs to be improved while keeping quality, reliability and manufacturing cost requirements. Efficiency of the drilling process still remains an issue particularly in the case of CFRP/metal stacks: hot and long metallic chips are difficult to remove and often damage the surface of CFRP holes. Low frequency axial vibration drilling has been proposed to solve this issue. This innovative drilling process allows breaking up the metallic chips in such a way that jamming is avoided. This paper presents a case of CFRP/Ti6Al4V drilling on a CNC machine where productivity must be increased. A comparison is made between the current regular process and the MITIS drilling process. First the analysis and comparison method is presented. The current process is analyzed and its limits are highlighted. Then the vibration process is implemented and its performances are studied. Both processes are compared according to the following criteria: chip morphology, thrust force, power consumption, tool life, cycle time, holes quality and manufacturing costs.
Technical Paper
2014-09-16
Sylvain Laporte, Etienne Gueydon, Alain Auffret, Cosme De Castelbajac
Abstract In today's aircraft assembly process several new features make drilling operations very challenging according to production requirements. Parts are made of thin or thick multi-material stacks with a large scope to cover and complex assembly sequences. In addition, the current ramp-up in aircraft programs involves to improve productivity while keeping process quality and reliability. In this context robotic solution meets perfectly all these requirements as it is flexible, reconfigurable, fast and agile. Among the possible end-effectors, the Barrel Multi-Function End Effector (BMFEE) appears to be the most flexible solution to allow many different process configurations. The latest developments have been focused on the drilling equipment of this BMFEE. In fact the drilling process efficiency can be constantly improved especially in terms of reliability, quality and productivity. Therefore vibration-assisted drilling system has been integrated into the BMFEE drilling module. This innovative drilling process allows breaking up the metallic chips in such a way that jamming is avoided.
Technical Paper
2014-09-16
Todd Rudberg, Justin Nielson, Mike Henscheid, Joshua Cemenska
Abstract The Automated Fiber Placement (AFP) machine layup run time in large scale AFP layup cells consumes approximately 30% of the entire part build time. Consequentially, further reductions to the run time of the AFP machine part programs result in small improvements to the overall cycle time. This document discusses how Electroimpact's integrated system and cell design reduces the overall cycle time by reducing the time spent on non-machine processes.
Technical Paper
2013-09-17
Angelo C. Conner, Luis Rabelo
The term “productivity” all too often has becomes a buzz-word, ultimately diminishing its perceived importance. However, productivity is the major concern of any team, and therefore must be defined to gain an appropriate understanding of how a system is actually working. Here, productivity means the level of contribution to the throughput of a system such as defined in the Theory of Constraints. In the field of space exploration, the throughput is the number of milestones of the mission accomplished as well as the potential survival during extreme events (due to failures or other unplanned events). For a time tasks were accomplished by expert individuals (e.g., an astronaut), but recently team structures have become the norm. It is clear that with increased mission complexity, “no single entity can have complete knowledge of or the abilities to handle all matters” [10]. Understanding now that teamwork is important, beneficial, and becoming the standard, a team profile must be developed.
Technical Paper
2013-01-09
A. N. Palkar
Transport plays major a role in the economic growth of the Nation and social welfare of the community. Wrong practices followed by Transport Operators result in environmental degradation and damage to Transport Infrastructure. To improve productivity and Safety of commercial transport sector in India, it is necessary for all transportation users to calculate, analyze and control the internal and external expenses. Dynamic weight of the moving truck is one of the methods which help to improve environmental quality, increase life of roads and bridges, increase life of the vehicle, enhance productivity and ensures high amount of safety. This paper describes System involving sensing techniques, design and integration, operational and feasibility analysis towards making it affordable, accurate and adaptable. This includes a proposal for regulatory bodies to respond to the challenge of implementation of rules for the productivity and safety of commercial road transport.
Technical Paper
2012-10-02
Sergio Marcio Sousa, Mario Lucio Araujo, Aline da Cassia Fonseca, Silvano Weslley Nascimento, Marcos Cesar Sousa
Modification of the workstations of the automaker engine assembly line in the Betim/MG unit, with a focus on ergonomics, reducing employee movement during the implementation of activities by eliminating activities that do not add value to the product. The entire project was structured according to WCM (World Class Manufacturing) methodology that consists of concepts, principles and techniques for managing operational processes, inspired by the Toyota Production System (TPS), which focuses on wastage elimination. The WCM is supported by technical and management pillars and the one used in this study was the WO (Workplace Organization) that seeks to create an ideal workplace to achieve maximum safety, improved quality, and maximum value in product transformation. The premise for the development of the solutions was the minimum use of resources, prioritizing simplicity of the devices by applying concepts of low cost automation (LCA) leaving the material near the assembling point. The results were workstations with balanced assembly times, thus increasing productivity by 30%, providing greater safety in the activities of the operator and a reduction of 39% in the activities that add no value to products.
Technical Paper
2012-09-10
Brian O'Rourke, Randy Rounkles
Unprecedented rates in Boeing 737 aircraft production have driven a need for an increase in capacity in fuselage manufacturing and assembly. This paper will discuss the requirements by Spirit AeroSystems to add capacity, and the new and upgraded machinery provided by Broetje Automation in response to these requirements. Production areas found to require additional capacity included galley and entry door skin fastening, as well as frame fastening in upper and lower lobes. Three new Mobile Panel Assembly Cell (MPAC) machines were installed in rapid succession for efficient and flexible production of door panels. For frame fastening of upper and lower lobes, three existing machines were taken out of production one at a time for a comprehensive upgrade resulting in process speed increases of more than 40%.
Technical Paper
2012-04-16
Tahsin Karaca, Murathan Soner, Sinan Ertunc, Mehmet Ali Arpacik, Mustafa Karaagac, Ahmet Kanbolat
In addition to providing a wide product range and meeting individual requirements of the customers to make the companies able to orient themselves to the competitive conditions in the automotive industry, properly structuring a capacity-productivity calculation algorithm is of a great importance in obtaining a competitive price advantage. In cases product diversity is too wide, and finished products cannot be measured with a single unit, measuring the production efficiency gets complicated. In addition, the ability to analyze all the inputs and outputs of the production with a single unit based on the same value for enterprises instead of analysis of combined units carried out based on a single perspective when calculating the production efficiency of the enterprises underlies continuous improvement and being able to set goals for the processes. This study describes an integrated system design based on equivalence logic, which can set forth production efficiency and the capacity utilization level in many aspects.
Technical Paper
2009-11-10
Hilmar Apmann, Martin Deepen, Thorsten Flessner
The high manufacturing-rate of CFRP-parts for aerospace components is demanding for efficient solutions in the field of automated systems and intelligent toolings. Combining these two factors the production of CFRP-parts is becoming more efficient than using this separately or even better than using manual processes and conventional toolings. The department of Production Systems within Premium AEROTEC has developed both self heating toolings for preforming and curing of CFRP-parts as w ell as automated handling and draping systems for CFRP-material (i.e. dry laminates or prepreg). This will be presented in this article.
Technical Paper
2009-04-20
Sudhir Sharma, Wang Chen
A recent Gartner Dataquest study predicts that the total worldwide automotive semiconductor market will grow from $20.1 billion in 2007 to $25.9 billion by 2010. The study also predicts that revenue from automotive usage of FPGAs will triple to approximately $312 million during that same period[1]. Many of these FPGAs will be deployed in safety applications such as back-up cameras, lane departure warning systems, blind-spot warning system, and adaptive cruise control. FPGAs will also be deployed in next-generation engine electronics, emissions control, navigation, and entertainment applications. Automotive systems engineers are adept at using Model-Based Design for implementing some of these embedded applications on DSPs and microcontrollers. Many of these engineers are new to FPGA design and waking up to a fragmented workflow that is making it harder to meet time-to-market and cost objectives. For example, engineers who are migrating their systems designs from DSPs to FPGAs are discovering that additional verification steps such as bit-true, cycle-accurate simulations are required to ensure that the FPGA functions the same as the system specification.
Technical Paper
2009-04-20
Ramesh Subramoniam, Gary Abusamra, Dale Hostetler
Remanufacturing, or Reman, is an industrial process whereby used products referred to as cores are restored to useful life [13]. The automotive reman products in the current state account for two thirds of all reman according to Steinhilper [12]. The growing “Green” awareness can force the automotive OEMs (Original Equipment Manufacturer) to demand more reman products from the OE suppliers in their contracts. Also reman makes a lot of economic sense for the customers and the OE suppliers since the reman products are sold at an average price range of 60% of the price of a new product [12]. This paper is a case study of how the authors applied lean principles to increase the project throughput through the reman engineering organization to meet the growing demand for reman products. Extensive literature exists on how to apply lean in the plant floor. But very few papers talk about how to apply the same lean principles in the office environment even before it hits the plant floor. Applying lean principles to the office area is more challenging since the transactional processes are not easily visible like a product moving through the different operations in a manufacturing plant.
Technical Paper
2008-04-14
Robert Baillargeon, Rick Flores
While the industry has recognized the value of modeling and code generation, the role of verification has taken a limited second tier role. Model Based Testing (MBT) is typically discussed in the context of automation of testing activities to eliminate the burden of generation and execution of tests. Unfortunately, this objective of effort minimization has skewed solutions away from using quality as a guiding metric. Alternatively, we have identified the simple objective of increasing the quality of testing practices and productivity of developers. In the following paper we introduce the integration of traditional software quality practices of functional, unit, and regression testing with the automated, model-driven world. This approach enables a quantitative approach to model driven software quality. The result is a robust technique that enables confident use of model-based development for production applications.
Technical Paper
2008-04-14
Deepak Gupta, Bhaskaran Gopalakrishnan, Hima Bindu Godavarthy
The goal of this research work is to explore the energy savings that may result from productivity improvement recommendations. The productivity improvement recommendations on setup time reduction and finished goods inventory reduction were taken from Industrial Assessment Center (IAC-WVU) and Industries of the Future (IOF-WVU) databases at West Virginia University (WVU) and analyzed to evaluate the corresponding energy savings. A simulation analysis was performed to compare the peak energy demands (kW) in the present and proposed scenarios for the setup time reduction recommendation. It was found that productivity improvement recommendations can result in significant energy savings (2% to 4%).
Technical Paper
2007-11-28
Marcelo Raeder, Fernando Forcellini
Lean Manufacturing philosophy resulted from the best practices combinations used in identifying and eliminating wastes along the manufacturing process, looking for simultaneously high quality, low cost, shorter lead-time and higher flexibility. Due to high competitiveness in first rate industries, mainly automotive, there is a great effort in applying Lean Manufacturing pfilosophy in deeper levels. When targeting full Lean Manufacturing implementation, product concept plays an important role on its efficacy. On the other hand, there is a lack of elements to support a most efficient product development while foccusing Lean Manufacturing philosophy implementation. Present article brings forward, in the form os guidelines called Design for Lean, a systematization of the best practices for product design that will support the development of products with focus on Lean Manufacturing implementation. These guidelines were gathered trough the identification of product requirements pertaining to implementation of Lean.
Technical Paper
2007-11-28
Alfredo C. Nuti, Angelo C. Nuti
The development of flexible fuel vehicles usually puts exhaust emissions in the critical path as more tests are required to cover different fuel blends. An informal survey showed that most engineers still use standard spreadsheets to analyze emissions data, usually a cumbersome, tedious and unproductive process. This paper describes the specification and development of a dedicated exhaust emissions data analysis tool, designed to improve productivity during the development phase. Through the combination of emissions and vehicle data, the tool automatically generates a set of reports that can be customized according to the best practices of each organization. The data analysis of an exhaust emissions test is performed using traditional methodologies and then compared to the new tool to emphasize the productivity gains.
Technical Paper
2007-09-17
Katsuya Koide, Takeshi Iwata
Heijunka production, a core element of Toyota Motor Company's well-known Just-in-Time production methodology, was developed to deliver vehicle orders in the shortest lead time, with minimum inventory and maximum production efficiency. It achieves this by averaging (“leveling out”) production quantity and model. Adaptable to any production environment, the Heijunka production is an effective tool for industries with low-mix/low-volume production systems. In our case study, a manufacturer of interior subassembly items for commercial jets implemented Heijunka production and achieved significant improvement in inter-process inventory, lead time and productivity. Most notably, inter-process inventory was reduced to 20% in just five years.
Technical Paper
2006-10-16
Marcus Chao
The purpose of this paper is to explore the challenges and opportunities for auto companies interested in setting up operations in emerging markets. One of the most widely accepted best practices is a concept called LeanThinking (1). This discussion focuses on the implementation of LeanThinking in China. In essence, LeanThinking is a broad management system; when applied to the manufacturing business sector, it is called lean manufacturing.
Technical Paper
2006-09-12
Raymond P. LeCann, Sylvain Guérin
Recently developed portable tools have proven themselves capable of feeding and installing fasteners automatically. They eliminate the entire manual processes attendant to the selection and manipulation of fasteners. The fasteners are either stored in remote cassettes or in storage built into the tools themselves. The paper will describe the various means of storing and automatically selecting the fasteners. Ergonomic enhancements, that offer reduced physical stress and provide a safer working environment, will be demonstrated. The configuration of two existing configurations, one suitable for Hi-lites© and the other for solid rivet installation, will be described. The details of the actual installation process and the computer interaction available in support of the installation processes will be described, along with the effect of the man/machine system on the flexibility, predictability and cycle time reduction of the process.
Technical Paper
2006-09-12
Katsuya Koide, Takeshi Iwata
The Kanban system is an essential tool for implementing a Just-in-Time (JIT) production process, which enabled Toyota Motor Company to achieve the highest productivity in the automotive world. Furthermore, it can be also a useful management method in other types of industries as well. In future, many organizations and business other than the automobile industry will discover the benefits of the Kanban system in achieving what we call “lean operation”. The Kanban system is an integral part of an overall Kaizen (“continuous improvement”) undertaking, acting as a visual control tool. Any JIT production process incorporating a Kanban system requires Heijunka (“leveled production”). This report includes an overview of an actual Kaizen operation incorporating a Kanban system at a sub-assembly process for aircraft components. After implementing the Kanban system, the average inventory cost was reduced by approximately 42% in one year. The Kanban system benefited the assembly process overall, with shorter lead-times, and faster detection and remedy of abnormalities in the production line.
Technical Paper
2006-04-03
Peter J. Schubert, Lev Vitkin, Frank Winters
Model-based systems development relies upon the concept of an executable specification. A survey of published literature shows a wide range of definitions for executable specifications [1, 2, 3, 4, 5, 6, 7, 8, 9 and 10]. In this paper, we attempt to codify the essential starting elements for a complete executable specification-based design flow. A complete executable specification that includes a functional model as well as test cases, in addition to a traditional prose document, is needed to transfer requirements from a customer to a supplier, or from a systems engineer to electrical hardware and software engineers. In the complete form demonstrated here, sub-components of a functionally-decomposed system manifest as modular reuse blocks suitable for publication in functional libraries. The overarching definition provided by product architecture and by software architecture must also be harmoniously integrated with design and implementation. Using seven specific automotive examples, we illustrate effective ways in which executable specifications have been used in production-ready applications.
Technical Paper
2005-11-22
Guilherme F. Fa. Sortino, Luc de Ferran
Summary Brazil is undergoing a positive phase. It is time to question ourselves about how have we come to this point and how is this going to evolve. Our country went, in little more than a decade, since the early Nineties, from a closed economy, with almost 50 years of experiments based on the import substitution model, for a wide open relation with the rest of the world, followed by internal adjustments (privatization of state owned companies, regulating agencies, some structural reforms) that led to the current configuration. Today a relatively mature relation with the rest of the World prevails, subject to the typical instabilities of the globalization, in which the Country, however, has been apt to participate of the international relations both as an exporter as an importer of goods and services, besides serving as a productive platform for many worldwide products. Soon after the Country experienced the aperture, a phase of true suffering for the national industry and its resources was initiated, mainly the human factors, who were affected by an enormous technological gap, either current or in formation, in relation to the more opened economies.
Technical Paper
2005-04-11
Arvind Hosagrahara, Paul Smith
Accurate measurements of productivity and quality are essential for balancing workload, creating predictable schedules and budgets, and controlling quality. Traditional software development processes include well-established methods for measuring productivity and quality. These include Lines of Code (LOC). With the introduction of Model-Based Design, organizations require a different measure of the software development process.
Technical Paper
2005-04-11
Adam Kopper, Raymond Donahue, David Olson, Stephen Midson
High-pressure die casting is a highly productive process that yields near net-shape castings at a relatively low cost. One disadvantage of die casting, however, is residual porosity that is inherently present in the castings. Semi-solid die casting is a method that is superior to die casting as it relates to porosity but has historically been a more expensive process. This is due to the higher cost of the billet feed material and the inability to easily recycle billets and runners. Slurry-on-Demand is a new semi-solid casting process that develops the semi-solid slurry directly from the liquid, thereby eliminating the cost penalties intrinsic to the billet semi-solid process. This paper will describe the Slurry-on-Demand process in detail and present case studies comparing the casting of large components using both Slurry-on Demand and conventional high-pressure die casting. It will also provide examples of quality improvements achievable by the Slurry-on-Demand process.
Technical Paper
2003-10-27
Kazutsugu Suita, Masato Shirai, Joji Ikushima
The integration of robot system operation is the most important and interesting issues for robot end users. Increasing robot operations by a growing variety of robots, applications, and models is a serious problem in maintaining high productivity and reducing maintenance cost. In the practical development of the Toyota global body assembly line (GBL), we designed a special robot operation and man-machine interface system based on the experience of robot operators. The Toyota Integrated Robot Operation System (IROS) offers remarkable advantages in the application of practical body assembly lines.
Technical Paper
2003-09-08
Askin T. Isikveren, Guenther Goritschnig, null, Mathieu Noël, null
The need to measure the relative value of business and commercial aircraft and how the designer/analyst can formulate an initial idea of what should constitute a satisfactory array of aircraft design specifications is presented. This is achieved firstly through the establishment of relevant productivity indexes using key target parameters or macroscopic objective functions. To complement this, a new primal objective function construct designated as the Airframer Paradigm is reviewed in order to ascertain how much a given set of design specifications are worth to the market. Finally, an overview of how new technologies and utility features affect the value of aircraft as well as an assessment of design philosophies for the present and future are discussed.
Technical Paper
2002-10-21
Raid Al-Aomar
Given the low business safety margins of today's highly competitive marketplace and companies' inevitable efforts towards cutting cost and continuous improvement, the automotive industry, as well as other manufacturing arenas, are in a deep need for developing quantifiable definitions of their relevant performance improvement criteria. Manufacturing operations often represents the core of a company's business strategy. Hence, this paper describes an analytical and a simulation-based integrated methodology for determining Manufacturing Performance Metrics (MPMs) at both process and system levels. The proposed methodology focuses on determining MPMs associated with four key Industrial Engineering criteria: Productivity, Quality, Reliability, and Effectiveness (PQRE). Other criteria such as Cost and Safety, which are commonly used in conjunction with the PQRE criteria for systems design and improvement, are not the focus of this paper. Determining PQRE metrics will provide engineers and managers of manufacturing systems with a set of practical control sensors and scoreboard that aid their efforts to assess the performance of a system's current state, evaluate future design proposals, and direct the organization's continuous improvement programs.
Technical Paper
2002-07-09
Abdullah Uzun
In recent years manufacturing and quality are not separate concepts. At first these concepts were thinking different step and process. In this world of tightening competition among manufacturer at a national and international level, the question of quality of important emerges as a serious issue. This concern is shared by all members of manufacturing and consumer. The manufacturing sector today, quality standards (ISO 9000) registration could become a requirement for any institute of standard wanting to do business in the international and/or national market-place. Therefore quality education and assurance are very important factors in higher education and engineering faculty. Quality is dynamic interaction and changeable. In the world of engineering education has been changing rapidly. This study about quality of manufacture, standards and quality system in Turkey and Sakarya on the basis of engineering faculty with some questionnaires about industrial company.
Technical Paper
2002-03-04
Nicola Bateman, Nick Rich, Arthur David
This paper outlines research conducted by the Society of Motor Manufacturers and Trader's (SMMT) Industry Forum (IF) and the Lean Enterprise Research Center at Cardiff University into the sustainability of Process Improvement activities (PI) activities undertaken by UK-based automotive components sector firms. The research methodology involved both quantitative and qualitative analyses of the case companies to identify those factors that positively and negatively affect sustainability. This paper will outline a definitional model of sustainable Process Improvement before presenting the research findings which identify ten enablers associated with more successful activities and highlights that, in addition to these enablers, a great diversity of issues associated with managing workplace sustainability. The paper concludes that companies should adopt a formal approach to PI similar to the IF method, should invest resources to exploit the ten basic enablers whilst simultaneously eroding the presence and impact of the counter-enablers identified during reviews of workplace improvement activities.
Technical Paper
2002-03-04
Kristin R. Brandenberg, John R. Keough, Ian Lee, Doug Maxwell, Phil Newman
In the increasingly competitive trucking industry, operators are continually seeking ways to haul higher volume and/or heavier loads to maintain profitability. Cross-continent shipments in Australia offer unique performance challenges to the box, frame, axles and suspension. Independent suspensions on large over-the-road box trailers can allow flat floors and increased cargo space. This paper chronicles the development of a unique suspension system that utilizes a complex ADI casting to survive the rigors of the Australian Outback. The suspension uses a short “stub” axle mounted and suspended at each wheel thus eliminating the need for a full axle running under the box and frame. This “axle-less” suspension allows the trailer box to have a flat floor and an additional 20 cubic meters of cargo space. The ADI suspension successfully replaced an earlier system constructed of steel weldments that failed in service. The low cost design, coupled with the increased cargo carrying capacity leads to a short payback on investment and improved profitability for the operator.
Technical Paper
2002-03-04
R. M. Newman, M. J. Tovey, C. S. Porter
A major activity in the development of a new car is the styling but this work has not been integrated into concurrent engineering methodologies. This paper describes ongoing work to increase the productivity and quality of styling and improving management and information flow by providing a means for r apid transformation from stylists' sketches to 3-D geometry. The result should be a less labor intensive way of generating 3-D computer m odels early in the styling process, allowing better feedback to stylists and their managers, and providing computer based geometry to engineers at a very early stage in the design lifecycle.
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