Currently in the aerospace industry is a change from the traditional nest production towards an automated mass production, which requires the fulfillment of very high demands on precision and availability of the new t...
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Currently in the aerospace industry is a change from the traditional nest production towards an automated mass production, which requires the fulfillment of very high demands on precision and availability of the new technologies. In a research cooperation between industrial companies and research institutions skills were developed for an automated production of carbon fib er composite parts for aircraft industries. A major challenge of the project was the enormous demands on the quality and the necessary evidence. While in automotive industries quality control will normally be carried out by samples, in the aircraft industry a 100%-monitoring is necessary to assure the safety of the aircraft and to reduce financial risks for the involved enterprises. The manufacturing process of assembling the wing-cover components made of carbon fiber composite – titanium/aluminum structures consists primarily of the operations of drilling, reaming, removal of temporary rivets and placing the final rivets. With about 5,000 rivets the correct and flawless insertion of the holes is extremely important. Therefore a core area of the project was the line quality monitoring of a damage-free drilling of carbon-fiber composites. This included the automated measurement of all holes with respect to diameter, roundness and chamfer angle, but also the identification of possible delamination between layers of carbon fiber composites. Since the potential defects are not detectable using a single physical system, a platform for an open-system combination of various physical processes such as thermal imaging sensors, image processing and laser scanning systems was developed. In this way it is possible to compensate the disadvantages of the individual systems through the added properties of the corresponding systems. Via the developed system, the relevant features can be extracted from the raw data and fed into a generic rating classification system and a learning process. The addition of other sen
Although energy efficient production is a topic of high interest both in industrial practice and research, the need for a comprehensive analysis of energy considerations in production control of manufacturing processe...
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ISBN:
(纸本)9783642290688
Although energy efficient production is a topic of high interest both in industrial practice and research, the need for a comprehensive analysis of energy considerations in production control of manufacturing processes at manufacturing control level has been largely ignored until now. This holds true especially for mixed-model production. The paper at hand discusses selected production control tasks, methods, processes and strategies for this production type and aims at identifying the extent to which energy features can be implemented into use, new and existing approaches and controlling tools. Based on first research activities, basic cases of energy-sensitive production control have been derived.
Linked data can be used to connect information stemming from usually disparate sources. The Semantic Web combines various kinds of logical reasoning for the inference of additional knowledge from existing data and for...
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Linked data can be used to connect information stemming from usually disparate sources. The Semantic Web combines various kinds of logical reasoning for the inference of additional knowledge from existing data and for consistency checking of data sets. Although mathematics is crucial for most areas where Semantic Web technologies can be applied, support for them is lacking from related standards and tools. This paper presents an approach for integrating OpenMath with RDF data for the representation of mathematical relationships and the integration of mathematical computations into reasoning systems.
Grain refinement by the application of very high strains with changing strain path is an outstanding approach for tailoring material properties. Methods of severe plastic deformation (SPD) can create ultrafine-grained...
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Micro bores are used for several high-precision applications, especially in hydraulic systems and fuel injectors. In this case the shape, particularly the edge rounding of the injection spray hole, has a significant i...
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ISBN:
(纸本)9780956679000
Micro bores are used for several high-precision applications, especially in hydraulic systems and fuel injectors. In this case the shape, particularly the edge rounding of the injection spray hole, has a significant influence on the atomization of fluids and therefore also on the combustion process [1]. Usually these micro bores are machined by electrical discharge machining (EDM) [2]. In EDM sharp edges occur due to the process characteristics and a specific influence on the edge shape is not possible. Thus, a specific and independent adjustment of the edge rounding is required. To produce such a defined edge rounding of bores, an Electrochemical Machining (ECM) process has been investigated. The advantages of this process lie in the possible high localization of the erosion process and high achievable surface quality. The tool which is the cathode has a negative potential and determined by the design of the edge rounding [3]. An experimental set-up was developed in order to perform the investigations. This paper presents the setup and experimental investigations.
The principle of electrochemical machining (ECM) is based on the anodic dissolution of conductive work piece materials under the influence of an electric charge exchange. On the boundary surface between the metallic w...
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ISBN:
(纸本)9780956679000
The principle of electrochemical machining (ECM) is based on the anodic dissolution of conductive work piece materials under the influence of an electric charge exchange. On the boundary surface between the metallic work piece and a liquid ion conductor, called electrolyte, the work piece material is dissolved and carried out of the machining area by the electrolyte flow. As a special procedure electrochemical machining with closed electrolytic free jet (Jet-ECM) offers the machining of work pieces with extremely high current densities and a high localization of the machined area. Referring to this the Jet-EC Machining of carbide metal alloys is investigated in this study.
A typical characteristic of printing machines is their high level of exploitation. But modern offset presses are as well large and complex mechanical systems that use energy in a large variety of electrical drives, fo...
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ISBN:
(纸本)9783642290688
A typical characteristic of printing machines is their high level of exploitation. But modern offset presses are as well large and complex mechanical systems that use energy in a large variety of electrical drives, for heating, air conditioning and drying. Increasing energy prices make the reduction of energy consumption in the operation of printing presses a highpriority, market-relevant issue with an initial target of around 15 %. General and new engineering knowledge provides a variety of possible approaches for reducing energy consumption. The goal is to find an optimal compromise between additional, cost-creating measures for the machine builder and real cost-reducing benefits for the end user.
In this paper the impact of different tool materials, tool coatings, and lubricants onto the micro forming process of micro cavities is investigated. As tool materials two different hardened steels were used for the f...
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ISBN:
(纸本)9780956679000
In this paper the impact of different tool materials, tool coatings, and lubricants onto the micro forming process of micro cavities is investigated. As tool materials two different hardened steels were used for the forming die. To lower the friction and adhesion between forming tool and aluminium substrate three coatings TiN (titanium nitride), TiCN (titanium carbon nitride), and DLC (diamond like carbon) were tested. Furthermore, the influences of different lubricants were studied. Geometric parameters and surface quality were judged by laser microscopy and SEM images of metallographic sections.
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