Dissertations / Theses on the topic 'Material processing of the cutting process'
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Ekstrand, Åsa. "Novel powder-coating solutions to improved micro-structures of ZnO based varistors, WC-Co cutting tools, and Co/Ni nano-phase films and sponges." Doctoral thesis, Uppsala University, Department of Materials Chemistry, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1948.
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Solution chemistry is a versatile and powerful tool in the synthesis of designed, complex nano-level high-tech materials. Normally, the technique is considered too expensive for large-scale production of complex multi-component ceramic materials. This thesis describes the expansion of the useful area of solution processing to multi-component bulk materials such as ZnO-based high-field varistors and WC–Co cutting tools, by developing novel techniques for solution-based coating of conventionally prepared metal and ceramic powders. The chemistry and microstructure development in the preparation of coatings, and the sintering of the coated powders to compacts, were studied in detail by SEM-EDS, TEM-EDS, XRD, IR-spectroscopy, dilatometry, TGA and DSC chemical analysis.
ZnO powder with a ca 20 nm thick, homogeneous oxide coat of Bi–Sb–Ni–Co–Mn–Cr–Al oxide was prepared. After sintering to dense varistor bodies, much improved microstructures with much reduced ZnO-grain sizes were obtained. This shows that the oxides added as liquid sintering aid and grain-growth inhibitor become much more active when added homogeneously as a skin on the ZnO powder.
After sintering of cobalt-coated WC, much improved micro-structures were obtained with a much more narrow WC grain-size distribution than that obtained from starting powders mixed by a conventional milling route. Coated powders also obviate the need for the extensive milling of WC and Co powders used in conventional mixing.
The novel solution route was also applied to preparation of porous sponges and thin films on metal, glass and Al2O3 of sub 20 nm sized Co- or Ni-particles.
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Матвієнко, Сергій Борисович. "Підвищення ефективності застосування змащувально-охолоджуючих засобів у виробництві." Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/30928.
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Структура та об’єм роботи. У магістерську дисертацію входить вступ, 3 розділи, загальні висновки, список використаної літератури. Робота складається з 69 сторінок тексту, 3 таблиці, 11 рисунків, 15 літературних джерел.
Актуальність теми. В цей час, протягом тридцяти – сорока років має особливу, важливу роль змащувально-охолоджуючі технологічні засоби для розвитку оброблення матеріалів різанням. Оптимальний підбір ЗОТЗ сприяє покращенню продуктивності виробництва, а також якості виробу тощо. Однак досі виникають питання по покращенню ефективності ЗОТЗ. Автор піднімає питання покращенню ефективності ЗОТЗ, структурний аналіз сумішей, переваги й недоліки їх, а також ефективність застосування даних технологічних засобів.
Мета й завдання дослідження. Аналіз й розробка теоретичних основ ефективності змащувально-охолоджуючих технологічних засобів, їх структури, вплив на продуктивність виробництва, якість, шорсткість виробу. Визначення переваг і недоліків певних перспективних змащувально-охолоджуючих технологічних засобів, їх структури, підходу, підводу до зони різання, універсальність тощо.
Об'єкт дослідження – ефективність змащувально-охолоджуючих технологічних засобів.
Предмет дослідження – визначення значення змащувально-охолоджуючих технологічних засобів у виробництві.
Методи дослідження: аналіз раніше опублікованих робіт, основ різання матеріалів і теорії змащувально-охолоджуючих технологічних засобів.
Наукова новизна отриманих результатів
1. Комплексний аналіз та висновки щодо впливу процесів різання на продуктивність виробництва й якість виробу.
2. Аналіз отриманої інформації та визначення типів сумішей, підводу до зони різання тощо.
3. Розробка алгоритму автоматизованого вибору ЗОР для підвищення ефективності виробництва.
4. Проведений аналіз дасть змогу підбити висновки щодо ефективності змащувально-охолоджувальних технологічних засобів. Визначення ефективних способів оброблення металів різання з використанням ЗОТЗ.
Практичне значення отриманих результатів. Отримана інформація допоможе дізнатися про підвищення ефективності способи застосування ЗОТЗ. Це дасть змогу підвищити продуктивність виробництва, а також підвищити якість виготовлених виробів.The structure and scope of work. The master's thesis includes an introduction, 3 chapters, conclusions, a list of used literature. The work consists of 69 pages of text, 3 tables, 11 figures, 15 literary sources. Relevance of the topic. At this time, for thirty - forty years, lubricating and cooling technological means for the development of cutting materials have a special, important role. The optimal selection of lubricating-cooling technological means contributes to the improvement of production productivity, as well as product quality and the like. However, there are still questions about improving the effectiveness of the lubricating-cooling technological means. The author raises the question of improving the efficiency of lubricating-cooling technological means, structural analysis of mixtures, their advantages and disadvantages, as well as the effectiveness of using these technological tools. The purpose and objectives of the study. Analysis of the effectiveness of cutting lubricants, their structure, the impact on production productivity, quality, product roughness. Determination of the advantages and disadvantages of certain promising cutting lubricants, their structure, approach, approach to the cutting zone, versatility, etc. Object of study - the effectiveness of lubricating-cooling technological means. The subject of the study is the determination of the value of cutting lubricants in production. Research methods: analysis of previously published works, the fundamentals of cutting materials and the theory of cutting lubricants. Scientific novelty of the results 1. Analysis and conclusions about the impact of cutting processes on production productivity and product quality. 2. Analysis of the information received and determination of the types of mixtures, supply to the cutting zone and the like. 3. Development of an algorithm for automated selection of cutting fluid to improve production efficiency. 4. The analysis will allow us to draw conclusions regarding the effectiveness of cutting lubricants. Determination of effective methods of processing metal cutting using lubricating-cooling technological means. The practical significance of the results. The information obtained will help to learn about improving the efficiency of the use of lubricating-cooling technological means. This will increase production productivity, as well as improve the quality of manufactured products.
Структура и объем работы. В магистерскую диссертацию входит введение, 3 главы, выводы, список использованной литературы. Работа состоит из 69 страниц текста, 3 таблицы, 11 рисунков, 15 литературных источников. Актуальность темы. В это время, в течение тридцати - сорока лет имеет особую, важную роль смазочно-охлаждающие технологические средства для развития обработки материалов резанием. Оптимальный подбор СОТС способствует улучшению производительности производства, а также качества изделия и тому подобное. Однако до сих пор возникают вопросы по улучшению эффективности СОТС. Автор поднимает вопрос улучшению эффективности СОТС, структурный анализ смесей, преимущества и недостатки их, а также эффективность применения данных технологических средств. Цель и задачи исследования. Анализ эффективности смазочно-охлаждающих технологических средств, их структуры, влияние на производительность производства, качество, шероховатость изделия. Определение преимуществ и недостатков определенных перспективных смазочно-охлаждающих технологических средств, их структуры, подхода, подводу к зоне резки, универсальность и др. Объект исследования - эффективность смазочно-охлаждающих технологических средств. Предмет исследования - определение значения смазочно-охлаждающих технологических средств в производстве. Методы исследования: анализ ранее опубликованных работ, основ резания материалов и теории смазочно-охлаждающих технологических средств. Научная новизна полученных результатов 1. Анализ и выводы о влиянии процессов резания на производительность производства и качество изделия. 2. Анализ полученной информации и определения типов смесей, подводу в зону резания и тому подобное. 3. Разработка алгоритма автоматизированного выбора СОЖ для повышения эффективности производства. 4. Проведенный анализ позволит подвести выводы относительно эффективности смазочно-охлаждающих технологических средств. Определение эффективных способов обработки металлов резки с использованием СОТС. Практическое значение полученных результатов. Полученная информация поможет узнать о повышении эффективности способы применения СОТС. Это позволит повысить производительность производства, а также повысить качество изготавливаемых изделий.
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Duttala, Satish. "Virtual material processing artificial intelligence based process selection." Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1174590077.
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Shi, Bin 1966. "Identification of the material constitutive equation for simulation of the metal cutting process." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115709.
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This study presents a novel methodology to characterize material plastic behavior within a practical range of stresses, strains, strain rates, and temperatures encountered in the metal cutting process. The methodology is based on integrating a newly developed analytical model with quasi-static tests and orthogonal cutting experiments that incorporate a laser heating system. Friction and heat transfer models are developed to describe the tribological and thermal interactions at the tool-chip interface. These models are implemented in a FEM package in order to improve the accuracy of the simulation of the machining process.The new analytical model, which is developed to predict the distributions of the stress, the strain, the strain rate, and the temperature in the primary shear zone, is based on conceptual considerations, as well as characterization of the plastic deformation process through comprehensive FEM simulations.
Orthogonal cutting experiments at room temperature and preheated conditions were carefully designed. While the cutting tests at room temperature provided the constitutive data encountered in the primary shear zone, the preheated cutting tests were designed to capture the material behavior at the high level of temperature and strain encountered in the secondary shear zone. In these preheated cutting tests, a laser beam was employed. Quasi-static tests were also utilized to identify some of the coefficients in the constitutive equations, in order to improve the convergence to a unique solution for the constitutive law.
Evaluation criteria were developed to assess the performance of constitutive equations. Based on the developed methodology and the evaluation criteria, a new constitutive equation for Inconel 718 has been proposed. This constitutive equation was further validated by Split Hopkinson Pressure Bar (SHPB) tests and cutting tests in conjunction with FEM simulations. The SHPB test data show an excellent agreement with the proposed material model. The cutting tests and the FEM simulation results also proved the validity of the proposed material constitutive law.
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Concetti, Alessia <1982>. "Integrated approaches for designing and optimizing thermal plasma processing for metal cutting and material treatment." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3883/.
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Peters, Christopher N. D. "In process monitoring and control for Nd:YAG laser material processing." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399233.
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ALMEIDA, IVAN A. de. "Otimização do processo de usinagem de titânio com laser pulsado de neodímio." reponame:Repositório Institucional do IPEN, 2007. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11589.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
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Burford, Mary Kathleen. "Material process monitoring with optical fiber sensors." Thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/45077.
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Our motivation for this work is based on the need to rnom tor the cure and inservice
health of composite materials. We describe the continuation of an effort to design a multi-functional fiber optic sensor which can be embedded in polymeric composite laminates for monitoring the degree of cure during its fabrication, as well as internal composite strains occurring post-cure.3 In short, this dual-purpose sensor combines the characteristics of a Fresnel reflectometer with those of the extrinsic Fabry-Perot interferometer. For monitoring cure, a broadband source is used so the output intensity of the sensor is amplitude-modulated as the refractive index of the conlposite is increased during the polymerization process. Post-cure, a coherent light source is implernented so a. sinusoidal variation of the output signal occurs when strains within the
composite cause the sensor output to be phase-modulated. We demonstrate the
measurement of refractive index with the Fresnel reflectometer/EFPL and test it as an embedded refractive index monitor. Our experimental results demonstrate that the refractive index of 5-nlinute epoxy increases by approximately 2 % during the cure process. In addition, the sensor can be used as an interferometer to measure intenlal composite strains, where the phase difference between consecutive fringe peaks is one-half the wavelength of the source.Master of Science
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Ziegelmeier, Stefan. "Process analysis and material behavior of thermoplastic elastomers throughout the laser sintering processing chain." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/31532/.
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Laser sintering (LS), an additive manufacturing (AM) technology, allows for the production of 3-dimensional parts by fusing together successive layers of polymer powder without the need for tooling. Its potential and applicability, however, is still constrained due to the limited repertoire of materials available and the lack of detail in understanding both the important process-material interactions and consequently the requirements for the development of new materials. Past research has mainly focused on polyamide 12 (PA12) as the standard material, hence most of the empirically grown or theoretical, often idealized, process models are based on this polymer. As a result, it was shown that there are strong interactions between the material and the process leading to an undesired deviation of part properties. Thermoplastic elastomers (TPEs) for LS have gained more and more popularity for the production of, for example flexible parts in the recent past but they are a group of polymers that is neither well studied nor understood regarding their use in LS. Therefore, this PhD investigation has focused on TPEs in order to reveal their process specifics throughout the processing chain in LS. As the properties of parts manufactured by LS are, amongst others, influenced by the packing and flow efficiencies of the powders, the bulk (static) and flow (dynamic) characteristics of the observed TPEs were examined on the powder scale as well as their effects on the process and parts. The resulting part properties were evaluated in terms of their tensile properties, surface roughness and density. In contrast to previous studies which have rarely taken into account the characteristics of the un-sintered particles, this work provided a novel approach quantifying and describing the interconnection between the powder characteristics as well as its performance and the part properties, thus providing valuable input on future material design. As mentioned before, for typical semi-crystalline thermoplastics such as PA12, different idealized process models describing the Pre-Process specifics exist, but they might not necessarily be applicable for thermoplastic elastomers with significantly different thermal characteristics. Consequently, the important interactions during processing of TPEs have been studied by high speed and high resolution thermography helping to indicate the most important material properties in combination with calorimetric analysis. The resulting understanding of crystallization and melting behaviour helped to derive a design of experiments revealing the possible range for the process management in terms of temperature control as well as energy input and the resulting part properties. Moreover, it is known that polymers used in LS change their intrinsic properties due to processing conditions that are close to the crystalline melting temperature. As a result, within this PhD investigation the ageing behaviour of TPEs was studied. Both the powder and the sintered parts were examined for chemical and physical ageing effects. The results showed that the materials observed could be used without refreshing throughout the applied ageing cycles, however, changes in the processing behaviour as well as in the parts’ mechanical properties were evident. These changes were due to the differing ageing states of the LS-powder showing an increase in the particle size affecting the bulk materials packing density. In the literature, modifications in the rheological properties due to thermal loads during LS are already known on basis of PA12. It was shown that they tend to experience an increase in molecular weight with increasing processing cycles. In this work it was found that TPEs exhibit the exact opposite trend in a slight decrease of molecular weight likely to reduce the mechanical strength of tensile specimens. By using novel process adapted methods in order to reveal vital interactions of TPE powders for LS, this thesis makes a significant contribution to an AM database. In addition, the comprehensive observation and applications of these methods over the whole processing chain helped expanding the understanding of important requirements for the development of new polymers for LS and builds a substantial basis for future work and quality assurance.
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Öqvist, Per-Olof. "Multivariate Data Analysis on (Ti,Al)N Arc-PVD coating process : MVDA of the growth parameters thickness, stress,composition, and cutting performance." Thesis, Uppsala universitet, Oorganisk kemi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448547.
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This diploma work was done at Seco Tools AB (SECO) in Fagersta and aimed to evaluate the possibility to model the relationship between deposition data, deposition properties and, cutting performance of a (Ti,Al)N coating on cutting inserts by applying the Multivariate Data Analysis (MVDA) modeling technique Partial Least Squares Projection to Latent Structures Modeling (PLS). Cathodic Arc Deposition (Arc-PVD) was the PVD technique focused on this study. The deposition technique that was focused on in this study was Cathodic Arc Deposition (Arc-PVD). For this purpose, two series of Arc-PVD coatings were manufactured. The first series aimed to generate a supervised explorative model for the deposition process. The second manufactured series was aimed to generate a batch-to-batch variation model of a deposition process. In the first supervised explorative model, the deposition parameters were set by a Design of Experiment (DOE) setup using a quarter factorial design with resolution III. In the second batch-to-batch model, the non-fixed deposition parameters and the cathode wear were monitored, and all other parameters were kept the same for every run. The results demonstrate good possibilities to model Arc-PVD coating properties and its performance in metal cutting with respect to the applied deposition parameters. The supervised explorative model confirmed previously established relationships, while the batch-to-batch model shows that variations between batches could be related to the wear of the cathode. This wear was shown to have a negative influence on the properties of the deposited coating.
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Wang, Jun. "Material removal sequence optimization for reducing workpiece deformation during thin-wall machining." Kyoto University, 2020. http://hdl.handle.net/2433/253274.
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Karlsson, Martin, and Gustaf Palm. "Mapping of order and purchasing processes at Processing Production Centre Lund - focusing on availability of material at production." Thesis, Linköpings universitet, Kommunikations- och transportsystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-131769.
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Processing Production Centre Lund (PPCL) är en affärsenhet inom Tetra Pak-koncernen som tillverkar processutrustning, förpacknings- och fyllningsmaskiner för livsmedel. I denna produktion är materialbrister vanligt förekommande vilket leder till kostsamma expressleveranser och icke värdeskapande arbete. Studiens mål är att identifiera problemkällor samt presentera förbättringsförslag för att minska antalet materialbrister i syfte att öka PPCLs leveransprecision, minska förekomsten av icke värdeskapande arbete samt reducera användandet av expressfrakt. Med hjälp av observationer, intervjuer och litteraturstudier har företagets arbetsprocesser kartlagts. Genom att jämföra de observerade arbetsprocesserna med de föreskrivna har de föreskrivna arbetsprocesserna konstaterats vara alltför generellt beskrivna, och ibland föråldrade, för att vara direkt tillämpbara för de anställda. Med flödesanalysmetoder har icke värdeskapande arbete belysts, problemkällor för delprocesser har påvisats och alternativa arbetsprocesser har föreslagits. Denna studie föreslår processutbildning för företagets anställda och bättre informationsdelning vid processuppdateringar. Detta skulle medföra en större insikt om hur egna handlingar påverkar andra samt leda till mer standardiserade arbetssätt. Vidare rekommenderas att de anställda tas med i arbetet med att ta fram detaljerade arbetsprocesser, bland annat för att utnyttja fördelarna med etablerade workarounds. Denna studie föreslår en ny process att följa vid ändringar i materialbehov, vilken skulle leda till bättre informerade materialval i tidigare skede. Dessutom rekommenderas striktare riktlinjer för när ändringar i materialval ska accepteras av PPCL utan förbehåll. Vidare klarlägger studien problem med de data som finns tillgängliga i Tetra Paks affärssystem. Felaktiga parametrar gällande ledtider på material från leverantörer och outnyttjade hjälpmedel vad gäller material som avbeställs eller ersätts leder ofta till materialbrister i produktionen. Studien lyfter fram standardiserade arbetsmetoder samt jämnare fördelning av arbetsbelastning för dem anställda som möjliga åtgärder till dessa problem. Stora materialgrupper som innefattar material med lång leveranstid leder ofta till materialbrist när behovet specificeras i ett sent skede. Denna studie föreslår artikelstandardisering och ett bättre informationsflöde mellan inköp och den som specificerar materialbehovet. Detta skulle minska uppkomsten av materialbrister. Ett annat problemområde som tas upp i studien är uppdelningen av de två affärsenheterna som är inblandade i orderflödet. Underutvecklade processer, dubbelarbete och få kommunikationskanaler är några av de problem som tas upp. Tvärorganisatoriska förbättringsprojekt förespråkas i studien för att förbättra och effektivisera detta samarbete för att i förlängningen minska antalet materialbrister. Slutligen rekommenderas att de ledtider som utlovas till slutkunderna ses över för att spegla verkliga ledtider på ett mer korrekt sätt. Felaktiga ledtider dömer produktionen till ett arbete under tidspress vilket innebär att det kontinuerliga förbättringsarbetet försakas.
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Nanjappa, Jagdish. "Web-based dynamic material modeling." Ohio University / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1174918633.
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Wilmot, Wessley. "Process and machine improvements and process condition monitoring for a deep-hole internal milling machine." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/process-and-machine-improvements-and-process-condition-monitoring-for-a-deephole-internal-milling-machine(2bb87f60-aa39-4fff-a82a-9360ce36b74c).html.
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Milling is a widely used cutting process, most commonly applied to machining external surfaces of workpieces. When machining operations are required within hard to reach areas of components, or deep within the bore of components, alternative methods of metal removal are generally employed. Typically when milling at extended reaches, difficulties may increase exponentially when trying to achieve distances several meters into a component. Essentially every topic of the milling process becomes difficult and more convoluted. Firstly to generate a stable cutting condition, and ultimately for an operator to be able to understand the cutting conditions, when all normal senses to interpret the machining stability are removed. The aim for the research is, to enable the operation of high slenderness ratio internal milling operations to become a viable technology, by detailing the measures required, to obtain a stable cutting condition. The process needs to be monitored for degradation of the tooling due to wear, and to prevent catastrophic machine damage from tool breakage or machine component failure. This research addresses the lack of knowledge available for milling with extended reaches, and the knowledge gained to overcome the real difficulties that exist for this process. Initial experiments are conducted on a prototype machine to gain experience of the internal machining operation and the many issues that it faced. Establishing requirements of the process via investigation of the tooling and necessary auxiliary equipment, it becomes possible to consider countermeasures to address the errors generated by torsional twisting of the milling arm. A system for applying a counter torque to reduce torsional deflection errors has been employed to successfully reduce the unavoidable issue over such long distances. For the process to become manageable for an industrial operator without a high level of specialist knowledge, the application of tool condition monitoring (TCM) and process condition monitoring (PCM) had to be applied. This addresses a void in available literature and research with respect to internal machining, and enables the process to become practical for an industrial environment. For this reason the research project will concentrate on the application of TCM and PCM onto the machining system. The completion of the research resulted in the process becoming satisfyingly stable, and with a resulting accuracy that satisfies the requirements of the component. Performance of the final system rivalled or achieved better results than had been experienced by the project sponsor.
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Eriksson, Magnus G. "Haptic and visual simulation of a material cutting process : a study focused on bone surgery and the use of simulators for education and training /." Licentiate thesis, Stockholm : Department of Neuronic Engineering, KTH, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4052.
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Hedemalm, Markus, and Zebastian Hallsten. "Business Case - Implementation of Laser Technologies at Scania Ferruform : Welding- and cutting applications for the manufacturing of banjo parts." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-68994.
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Scania Ferruform AB is an independent affiliate of the truck- and bus manufacturer Scania AB which produces rear axle housings among other chassis components for said vehicles. The banjo part, i.e. the base of the rear axle housings undergoes processes which have issues both in terms of exceeded technical life span and insufficient production capacity. These three processes consist of both milling and welding operations. In order to resolve these issues the discussion of future investments arise. As this is discussed, the question whether alternative technologies could be of interest, specifically the performance of welding- and cutting operations with the use of laser technologies. By reviewing state-of-the-art literature, studying the present production conditions and interviewing experts within academia as well as parties active in developing and supplying industrial laser systems it has been shown that a laser arc hybrid welding technique would be the most suitable replacement, while laser nitrogen cutting would be the most suitable cutting technique. This project presents the theoretical outcome of implementing laser arc hybrid welding as a replacement to the present and conventional gas metal arc welding, as well as the possibility of using laser nitrogen cutting as a replacement to a set of milling processes. The study has shown that by implementing these technologies in a manner which also alters the balance in performed operations achieves a cycle time below the future goal for each production section. Cycle time values, quantities and costs are expressed with an indexed value of t, n and k respectively due to confidentiality. The first investment scenario results in an annual saving of consumption costs by 4 738k SEK, with a total investment cost of 112 743k SEK and 6,9 years pay-off time. The second scenario results in an annual saving of consumption costs by 5 018k SEK, with a total investment cost of 114 843k SEK and 5,2 years pay-off time. The third scenario is similar to the second in terms of the manufacturing processes, but it is the alternative of the lowest investment cost. This scenario would result in the same sum of annual savings as the second scenario, but with an investment cost of 89 843k SEK and 0,2 years pay-off time.
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Cabrera, Alvino Géraldine. "Eco-design and processing of recycled multilayer/multiphase polymer materials : Structure-properties-process relationship." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI076.
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Dans un contexte d’économie circulaire, les premiers travaux de la thèse ont été consacrés à l’étude de l’aptitude à la mise en forme de films souples recyclés provenant de déchets agricoles d’enrubannage et d’horticulture. Ces films multicouches contiennent initialement un additif conférant au produit final un caractère collant. Lors de leur recyclage, cet additif est toujours présent et migre à la surface. Un accent particulier a été dédié à la compréhension et l’étude des mécanismes de migration de cet additif en fonction de l’architecture moléculaire des polyéthylènes utilisés ayant des taux de branchements différents. Pour ce faire, des mélanges modèles, avec ou sans charges minérales, ont été élaborés. Outre des études morphologiques et microstructurales, des méthodologies expérimentales originales ont été mises en place pour étudier la cinétique de migration/diffusion avec des dispositifs tribo-rhéométriques et de suivi du "tack" en surface des films. Quant au comportement rhéologique en cisaillement et en élongation, il est influencé par la présence de cet additif. La deuxième partie de cette étude a été consacrée à l’appréhension des réalités de l’activité du recyclage d’autres films mutlicouches souples à base de polypropylène et polyéthylène. Compte tenu de la complexité de ces gisements, nous avons choisi d’étudier des mélanges modèles équivalents en leur associant des compatibilisants de nature physique. L’influence de ces derniers sur les propriétés rhéologiques, morphologiques et mécaniques a été ensuite évaluée. Cette étude a été ensuite transposée à des systèmes multiphasés post usage. Les derniers travaux ont été dédiés à une approche prospective. Il s’agit d’aller de l’éco-design à l’élaboration de multi-micro/nanocouches facilement recyclables. L’originalité de cette étude consiste à limiter le nombre de constituants, à réduire/contrôler les épaisseurs des couches et éviter l’utilisation des couches de liants. Enfin, leurs propriétés rhéologiques, morphologiques et mécaniques ont été évaluées en fonction des cycles de recyclage mécaniqueIn the context of a circular economy, the first works of the thesis were devoted to the study of the processing ability of recycled flexible films from agricultural bale wrapping film's waste. These multilayer films initially contain an additive that gives the final product a sticky character. During recycling, this additive is still present and migrates to the surface. A particular emphasis has been placed on understanding and studying the migration mechanisms of this additive according to the molecular architecture of the polyethylenes used with different branching content. Model blends, with or without mineral fillers, were prepared for this purpose. In addition to morphological and microstructural studies, original experimental methodologies have been set up to study the migration/diffusion kinetics with tribo-rheometry and film surface's "tack" monitoring devices. As for the rheological behaviour in shear and elongation, it is influenced by the presence of this additive. The second part of this study was devoted to understanding the realities of the recycling activity of other polypropylene- and polyethylene-based multilayer films. Given the complexity of these materials, we chose to study equivalent model blends by combining them with physical compatibilizers. The influence of the latter on the rheological, morphological and mechanical properties was then evaluated. This study was then transposed to postconsumption multiphase systems. The last studies were devoted to a future-oriented approach. This involves going from eco-design to the development of easily recyclable multimicro/ nanolayers. The originality of this study consists in limiting the number of constituents, reducing/controlling the thickness of the layers and avoiding the use of tie-layers. Finally, their rheological, morphological and mechanical properties have been evaluated according to number and type of mechanical recycling cycles
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Lindell, David. "Process Mapping for Laser Metal Deposition of Wire using Thermal Simulations : A prediction of material transfer stability." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-85474.
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Additive manufacturing (AM) is a quickly rising method of manufacturing due to its ability to increase design freedom. This allows the manufacturing of components not possible by traditional subtractive manufacturing. AM can greatly reduce lead time and material waste, therefore decreasing the cost and environmental impact. The adoption of AM in the aerospace industry requires strict control and predictability of the material deposition to ensure safe flights. The method of AM for this thesis is Laser Metal Deposition with wire (LMD-w). Using wire as a feedstock introduces a potential problem, the material transfer from the wire to the substrate. This requires all process parameters to be in balance to produce a stable deposition. The first sign of unbalanced process parameters are the material transfer stabilities; stubbing and dripping. Stubbing occurs when the energy to melt the wire is too low and the wire melts slower than required. Dripping occurs when too much energy is applied and the wire melts earlier than required. These two reduce the predictability and stability that is required for robust manufacturing. Therefore, the use of thermal simulations to predict the material transfer stability for LMD-w using Waspaloy as the deposition material has been studied. It has been shown that it is possible to predict the material transfer stability using thermal simulations and criterions based on preexisting experimental data. The criterion for stubbing checks if the completed simulation result produces a wire that ends below the melt pool. For dripping two criterions shows good results, the dilution ratio is a good predictor if the tool elevation remains constant. If there is a change in tool elevation the dimensionless slenderness number is a better predictor. Using these predictive criterions it is possible to qualitatively map the process window and better understand the influence of tool elevation and the cross-section of the deposited material.Additiv tillverkning (AT) är en kraftigt växande tillverkningsmetod på grund av sin flexibilitet kring design och möjligheten att skapa komponenter som inte är tillverkningsbara med traditionell avverkande bearbetning. AT kan kraftigt minska tid- och materialåtgång och på så sett minskas kostnader och miljöpåverkan. Införandet av AT i flyg- och rymdindustrin kräver strikt kontroll och förutsägbarhet av processen för att försäkra sig om säkra flygningar. Lasermetalldeponering av tråd är den AT metod som hanteras i denna uppsats. Användandet av tråd som tillsatsmaterial skapar ett potentiellt problem, materialöverföringen från tråden till substratet. Detta kräver att alla processparametrar är i balans för att få en jämn materialöverföring. Är processen inte balanserad syns detta genom materialöverföringsstabiliteterna stubbning och droppning. Stubbning uppkommer då energin som tillförs på tråden är för låg och droppning uppkommer då energin som tillförs är för hög jämfört med vad som krävs för en stabil process. Dessa två fenomen minskar möjligheterna för en kontrollerbar och stabil tillverkning. På grund av detta har användandet utav termiska simuleringar för att prediktera materialöverföringsstabiliteten för lasermetalldeponering av tråd med Waspaloy som deponeringsmaterial undersökts. Det har visat sig vara möjligt att prediktera materialöverföringsstabiliteten med användning av termiska simuleringar och kriterier baserat på tidigare experimentell data. Kriteriet för stubbning kontrolleras om en slutförd simulering resulterar i en tråd som når under smältan. För droppning finns två fungerande kriterier, förhållandet mellan svetshöjd och penetrationsdjup om verktygshöjden är konstant, sker förändringar i verktygshöjden är det dimensionslös ”slenderness” talet ett bättre kriterium. Genom att använda dessa kriterier är det möjligt att kvalitativt kartlägga processfönstret och skapa en bättre förståelse för förhållandet mellan verktygshöjden och den deponerade tvärsnittsarean.
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Ho, Yee Hsien. "In Vitro Behavior of AZ31B Mg-Hydroxyapatite Metallic Matrix Composite Surface Fabricated via Friction Stir Processing." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc862762/.
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Magnesium and its alloys have been considered for load-bearing implant materials due to their similar mechanical properties to the natural bone, excellent biocompatibility, good bioactivity, and biodegradation. Nevertheless, the uncontrollable corrosion rate in biological environment restrains their application. Hydroxyapatite (HA, Ca10(PO4)6(OH)2) is a widely used bio-ceramic which has bone-like mineral structure for bone fixation. Poor fracture toughness of HA makes it not suitable for load-bearing application as a bulk. Thus, HA is introduced into metallic surface in various forms for improving biocompatibility. Recently friction stir processing (FSP) has emerged as a surface modification tool for surface/substrate grain refinement and homogenization of microstructure in biomaterial. In the pressent efforts, Mg-nHA composite surface on with 5-20 wt% HA on Mg substrate were fabricated by FSP for biodegradation and bioactivity study. The results of electrochemical measurement indicated that lower amount (~5% wt%) of Ca in Mg matrix can enhance surface localized corrosion resistance. The effects of microstructure,the presence of HA particle and Mg-Ca intermetallic phase precipitates on in vitro behavior of Mg alloy were investigated by TEM, SEM, EDX,XRD ,and XPS. The detailed observations will be discussed during presentation.
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Hejzlar, Aleš. "Optimalizace výrobního procesu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228195.
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This diploma thesis deals with the production process optimization. The cutting operation and the lathe-turning issue is described in this thesis. In the practical part the production process is analyzed, the designed experiment (DOE) is suggested and evaluated. In the end of the practical part there is the evaluation of the machined material in the light of microstructure. On the basis of the partial findings the enclosures are done and the recommendations leading to the production optimization are suggested.
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Karlsson, Oscar, and Oskar Hjalmarsson. "Effektivare material-och produktionsstyrning för minskad genomloppstid i en process hos ett företag med funktionell layout : En fallstudie på Press Kogyo Sweden AB." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-104538.
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Bakgrund: Dagens marknader har med tiden tenderat att bli mer globala vilket i sin tur har ökat konkurrensen mellan företag. Detta har inneburit att många industriorganisationer har behövt förändra sig för att vara konkurrenskraftiga på marknaden. Ett koncept som idag genomsyrar många företag är lean vilket bygger på att maximera användandet av sina resurser, eliminera slöserier och skapa en effektivare tillverkning. Genom att arbeta med lean kan företag uppnå snabbare genomloppstider. Syfte: Syftet med studien är att kartlägga Press Kogyos propellerprocess för att kunna identifiera icke-värdeadderande aktiviteter i processen. Vidare kommer studien bidra Press Kogyo med förslag gällande hur en effektivare material- och produktionsstyrning kan reducera genomloppstiden i propellerprocessen. För att studien ska uppnå teoretisk relevans är ytterligare ett syfte med studien att bidra med teori kring hur tillverkande företag, med en funktionell layout, kan reducera de nackdelar som finns med layouten med effektivare material- och produktionsstyrning. Genomförande: Studien har delats upp i tre forskningsfrågor. De två första forskningsfrågorna var specifikt inriktade mot det studerade företaget medan den tredje forskningsfrågan var mer generellt ställd mot tillverkande företag med funktionell layout. Studien har genomförts som en fallstudie och präglats av kvalitativa forskningsmetoder. Empiriska data har samlats in genom intervjuer, observationer samt en fokusgrupp. För första forskningsfrågan skapades processkartor och VSM-kartor. Dessa i samband med diverse intervjuer låg till grund för att identifiera icke-värdeadderande aktiviteter/slöserier i propellerprocessen vilka påverkade genomloppstiden. För forskningsfråga två applicerades teori kring material-och För tillverkande industriföretag kan en reducering av genomloppstid generera diverse fördelar. Några av dessa fördelar är: minskat antal produkter i arbete, bättre kvalité, minskade kostnader, bättre prognoser, ökad flexibilitet samt minskad ledtid gentemot kund. Press Kogyo har under en längre period upplevt en problematik kring en av deras processer. Problematiken har legat i att de inte vetat om vilka icke- värdeadderade aktiviteter som finns i processen samt hur de påverkar genomloppstiden. produktionsstyrning i syfte att reducera de icke-värdeadderande aktiviteterna/slöserier som identifierats och följaktligen reducera genomloppstider i processen. Gällande forskningsfråga tre genomfördes intervjuer med det studerade företaget och ett annat tillverkande företag med funktionell layout. Författarna ämnade att genom dessa intervjuer besvara hur tillverkande företag med en funktionell layout kan reducera de nackdelar som finns med den layouten med hjälp av effektiv material- och produktionsstyrning. Slutsats: I studien identifierades sju slöserier där väntan ansågs vara det slöseri vilket mest påverkade genomloppstiden i propellerprocessen. För att eliminera alla slöserier och framförallt väntan applicerades teori kring material- och produktionsstyrning med fokus på production activity control (PAC). Den teori vilken användes skapade också en teoretisk modell vilken kan vara en bra grund när företag med funktionell layout vill effektivisera sin planering. Vissa delar av den teoretiska modellen användes också senare i studien där den användes för att reducera de nackdelar vilka kan finnas med en funktionell layout.Background: Today's markets have over time tended to become more global, which in turn has increased competition between companies. This has meant that many industry organizations have had to change in order to be competitive in the market. A concept that today permeates many companies is the lean practice, which is based on maximizing the use of resources, eliminating waste, and creating more efficient production. By working with lean, companies can achieve faster throughput time. For manufacturing industrial companies, a reduction in throughput time can generate various benefits. Some of these advantages are: reduced number of products in work, better quality, reduced costs, better forecasts, increased flexibility and reduced lead time towards customers.Press Kogyo has for a long period experienced problems with one of their processes. The main problem has been that they do not know what non-value-added activities/waste that can be found in the process and how these activitiesaffect the total throughput time of the process. Purpose: The purpose of the study is to map Press Kogyo's propeller process in order to be able to identify non-value-adding activities in the process. Furthermore, the study will provide Press Kogyo with proposals regarding how more efficient material and production control can reduce the throughput time in the propeller process. In order for the study to achieve theoretical relevance, another purpose of the study is to contribute with theories about how manufacturing companies, with a functional layout, can reduce the disadvantages of the layout with more efficient material and production control. Methodology: The study has been divided into three research questions. The first two research questions were specifically aimed at Press Kogyo, while the third research question was more generally directed at manufacturing companies with a functional layout. The study was conducted as a case study and was characterized by qualitative research methods. Empirical data has been collected through interviews, observations, and a focus group. For the first research question, process maps and VSM maps were created. This together with various interviews created the foundation for identifying non-value-adding activities/waste in the propeller process which affected the throughput time. For research question two, theory of material and production control was applied in order to reduce the non-value-adding activities/waste and consequently reduce throughput time in the process. Regarding research question three, interviews were conducted with Press Kogyo and another manufacturing company with a functional layout. The authors intended to, through these interviews, find answers to how manufacturing companies with a functional layout can reduce the disadvantages of the layout with the help of efficient material and production control. Conclusions: In the study, seven wastes were identified where “wait” was considered to be the waste that affected throughput time the most in the propeller process. To eliminate all waste and specifically the waste “wait”, methods and theories regarding material and production control was applied with a focus on production activity control (PAC). All the different theories that was used also created a theoretical model which can be a good basis for planning when companies with a functional layout want to find ways tostreamline their planning. Some parts of the theoretical model were also used later in the study where it was used to reduce the disadvantages that may exist with a functional layout
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Хавин, Геннадий Львович. "Моделирование, оптимизация и проектирование технологических процессов механической обработки полимерных композиционных материалов." Thesis, НТУ "ХПИ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21756.
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Диссертация на соискание ученой степени доктора технических наук по специальности 05.02.08 – технология машиностроения. – Национальный технический университет "Харьковский политехнический институт", Харьков, 2016.
Диссертация посвящена развитию технологии механической обработки полимерных композиционных материалов. Решена научно-техническая задача повышения качества и производительности операций точения и сверления за счет применения теории рационального выбора инструмента и оптимального расчета режимных параметров обработки. Используя достижения механики разрушения и контактного разрушения, разработана теория перерезания волокон (жгутов) при механической обработке ПКМ. Сформулирована математическая модель зарождения трещины в контакте как результат внедрения абсолютно жесткого индентора заданной кривизны. Используя метод граничных элементов, разработана численная модель контактного взаимодействия вершины инструмента с обрабатываемым композитом. Задача решается в несколько этапов. На последнем этапе моделируется контактное взаимодействие вершины инструмента и фрагмента ПКМ в виде "жгут-связующее-жгут". Проведена систематизация известных эмпирических зависимостей силовых факторов и фактора расслоения при обработке различных видов ПКМ различными типами инструментов. Представлены оценки по влиянию состава ПКМ, армирования и направления обработки на разлохмачивание поверхности отверстий и шероховатость. Сформулированы задачи оптимизации при механической обработке, которые решаются методом "роя частиц" и "серого реляционного анализа". Для операции сверления разработана новая схема назначения режимов сверления в основу, которой положен выбор величины подачи не по шероховатости, а по заданному значению величины расслаивания на выходе инструмента и коэффициенту разлохмачивания на внутренней поверхности отверстия. На основе представленных моделей и методов оптимального проектирования создано математическое обеспечение для выбора оптимальных режимов токарной и сверлильной обработки ПКМ.Thesis for granting the Degree of Doctor of Technical sciences on a specialist 05.02.08 – Manufacturing engineering. – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2016. The thesis is dedicated to the improvement of technology machining of polymeric composite materials (FRP). With the achievement of fracture mechanics and contact fracture developed a theory cut fibers (rovings), when machining fibrous polymeric materials. A mathematical model based on the boundary element method and linear fracture mechanics is developed. The resulting patterns of distribution of stresses in contact with the top of the instrument with fragile material, depending on the geometrical parameters of the tool and process parameters processing are archived. From the point of fracture mechanics provided technological dependence on the cutting conditions and their impact on the effectiveness of the treatment. Aspects of tool assigning and influence of tool mark material and its geometric parameters on tool life are presented. The model of prediction delamination factor when drilling FRP is proposed. Influences of FRP composition and direction reinforcement on the quality of the drilling holes are considered. The systematization of known empirical relationships of power factor and delamination factor in the processing of various types of FRP for different types of tools is provided. The problems of machining optimization are formulated and they are solved by "swarm particles" method and "gray relation analysis" method. The software for the choice of the optimum cutting conditions of turning and drilling processing FRP is created.
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Chandran, Sarath, and Mathews Jithin Abraham. "Simulation and Optimization of CNC controlled grinding processes : Analysis and simulation of automated robot finshing process." Thesis, Högskolan i Halmstad, Maskinteknisk produktframtagning (MTEK), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-30709.
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Products with complicated shapes require superior surface finish to perform the intended function. Despite significant developments in technology, finishing operations are still performed semi automatically/manually, relying on the skills of the machinist. The pressure to produce products at the best quality in the shortest lead time has made it highly inconvenient to depend on traditional methods. Thus, there is a rising need for automation which has become a resource to remain competitive in the manufacturing industry. Diminishing return of trading quality over time in finishing operations signifies the importance of having a pre-determined trajectory (tool path) that produces an optimum surface in the least possible machining time. Tool path optimization for finishing process considering tool kinematics is of relatively low importance in the present scenario. The available automation in grinding processes encompass around the dynamics of machining. In this paper we provide an overview of optimizing the tool path using evolutionary algorithms, considering the significance of process dynamics and kinematics. Process efficiency of the generated tool movements are studied based on the evaluation of relative importance of the finishing parameters. Surface quality is analysed using MATLAB and optimization is performed on account of peak to valley height. Surface removal characteristics are analysed based on process variables that have the most likely impact on surface finish. The research results indicated that tool path is the most significant parameter determining the surface quality of a finishing operation. The inter-dependency of parameters were also studied using Taguchi design of experiments. Possible combinations of various tool paths and tool influencing parameters are presented to realize a surface that exhibits lowest errors.European Horizon 2020 Project SYMPLEXITY
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Хавін, Геннадій Львович. "Моделювання, оптимізація й проектування технологічних процесів механічної обробки полімерних композиційних матеріалів." Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21752.
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Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.02.08 – технологія машинобудування. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2016.
Дисертацію присвячено розвитку технології механічної обробки полімерних композиційних матеріалів. Використовуючи досягнення механіки руйнування і контактного руйнування розроблено теорію різання волокон (джгутів) при механічній обробці волокнистих полімерних матеріалів. Побудовано математична модель на базі метода граничних елементів і лінійної механіки руйнування. Отримані закономірності розподілу напружень в контакті вершини інструменту з крихким матеріалом в залежності від геометричних параметрів інструменту та технологічних параметрів обробки. З позицій механіки руйнування надано залежність спрямованого руйнування від режимів різання і їх вплив на ефективність процесу обробки. Розроблено принципи призначення інструменту і вплив марки матеріалу у та його геометричних параметрів на стійкість. Запропоновано модель прогнозування фактору розшарування при свердлінні ПКМ. Досліджено вплив складу ПКМ і напрямку армування на якість просвердлених отворів. Проведено систематизацію відомих емпіричних залежностей силових факторів і фактору розшарування при обробці різних видів ПКМ різними типами інструментів. Сформульовано задачі оптимізації при механічній обробці, які рішаються методом "рою частинок" і "сірого реляційного аналізу". Створено математичне забезпечення щодо вибору оптимальних режимів обробки ПКМ.Thesis for granting the Degree of Doctor of Technical sciences on a specialist 05.02.08 – Manufacturing engineering. – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2016. The thesis is dedicated to the improvement of technology machining of polymeric composite materials (FRP). With the achievement of fracture mechanics and contact fracture developed a theory cut fibers (rovings), when machining fibrous polymeric materials. A mathematical model based on the boundary element method and linear fracture mechanics is developed. The resulting patterns of distribution of stresses in contact with the top of the instrument with fragile material, depending on the geometrical parameters of the tool and process parameters processing are archived. From the point of fracture mechanics provided technological dependence on the cutting conditions and their impact on the effectiveness of the treatment. Aspects of tool assigning and influence of tool mark material and its geometric parameters on tool life are presented. The model of prediction delamination factor when drilling FRP is proposed. Influences of FRP composition and direction reinforcement on the quality of the drilling holes are considered. The systematization of known empirical relationships of power factor and delamination factor in the processing of various types of FRP for different types of tools is provided. The problems of machining optimization are formulated and they are solved by "swarm particles" method and "gray relation analysis" method. The software for the choice of the optimum cutting conditions of turning and drilling processing FRP is created.
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Таран, Євгеній Сергійович. "Оправка розточна збірна." Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/31456.
Full textAbstract:
Метою дипломного проекту є проектування оправки розточної збірної,
яка застосовується для обробки внутрішніх та зовнішніх циліндричних
поверхонь, свердління отвору, точіння внутрішніх канавок та підрізання
торця. Даний інструмент оснащений змінними твердосплавними пластинами,
які надійно закріплені в корпусі інструменту. Також було проаналізовано
конструкції інструментів для оброблення різних типів поверхонь, створене
робоче креслення та 3D модель інструменту, розроблено технологію
виготовлення і розраховано режими різання, вибрано та розраховано
технологічне пристосування для фрезерування посадочних поверхонь під
пластину з твердого сплаву, представлена керуюча програма для верстату з
ЧПК та візуалізація процесу обробки.The purpose of the diploma project is the design of the mandrel of the blade assembly, which is used for the treatment of internal and external cylindrical surfaces, drilling a hole, rolling the grooves and triming the ends. This tool is equipped with replaceable carbide plates, which are securely mounted in the tool casing. The structure of the tools for processing various types of surfaces was also analyzed, a working drawing and a 3D model of the tool were created, a production technology was developed and cutting patterns were calculated, a technological device for milling the landing surfaces under a solid alloy plate was selected and calculated, the control program for the CNC machine and visualization of the processing process are presented.
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Karlsson, Philip, and Marcus Rex. "Utveckling av internt materialförsörjningssystem : En fallstudie på Hörle Automatic." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-66940.
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Bakgrund: Under de senaste decennierna har industriell logistik fått en allt viktigare roll för att ge företag konkurrensfördelar på den globala marknaden. För att uppnå ökad effektivitet i logistikfunktionen kan konfigurationen av ett internt materialförsörjningssystem ha en betydande inverkan på minimering av icke värdeadderande aktiviteter. Det finns flera principer för intern materialförsörjning, hur dessa appliceras har en signifikant påverkan i en industriell miljö. Valet mellan olika system kännetecknas av en överhängande komplexitet där tillverkningsindustrier byter fram och tillbaka flera gånger. Syfte: Syftet med studien är att föreslå ett ramverk för utveckling av interna materialförsörjningssystem gällande svetsprocess inom metallbearbetning. Genomförande: Studien är genomförd som en enfallsstudie på Hörle Automatic. Där studiens tillvägagångsätt har varit att identifiera icke värdeadderade aktiviteter i fallföretagets interna materialförsörjningssystem till svetsprocessen. För att därefter utveckla deras nuvarande system för att minimera identifierade aktiviteter. Utifrån detta har ett ramverk konstruerats som belyser faktor som ska tas i beaktning vid utveckling av ett internt materialförsörjningssystem. Empiriskt material har samlats in genom intervjuer, observationer, fokusgrupper och arkivmaterial. För att möjliggöra identifiering av icke värdeadderande aktiviteter har en processkartläggning upprättats. Fortsättningsvis har det genomförts tester gällande förslag på arbetssätt som utvecklats. Resultat/Diskussion: Ett ramverk har konstruerats som belyser elva olika faktorer som ska tas i beaktning vid utveckling av ett internt materialförsörjningsystem. Det är faktorer relaterade till produktionsvariation, detaljspecifikation, layout, leverantörer och kommunikation. Slutsats: Det har identifierats totalt 18 icke värdeadderande aktiviteter gällande Hörle Automatics interna materialförsörjningssystem till svetsprocessen. Utvecklingen av det interna materialförsörjningssystemet enligt förslag eliminerar en del icke värdeadderande aktiviteterna som identifierats. Resterande aktiviteter minskas genom utvecklingen av en materialförsörjningsprocess som möjliggör en ny layout och att mer kostnadseffektiv personal utför de icke värdeadderande aktiviteternaBackground: Over the past decades, industrial logistics has gained an increasingly important role in giving companies a competitive edge in the global market. To achieve increased efficiency in the logistics function, the configuration of an internal materials supply system may have a significant impact on minimizing non-value added activities. There are several principles for internal materials supply system, how these are applied have a great impact on it’s industrial environment. The choice between different systems is characterized by an complexity where manufacturing industries change back and forth several times. Purpose: The purpose of this study is to propose a framework for the development of internal materials supply systems in the welding process within metalworking. Methodology: This is a case study at Hörle Automatic. The study approach has been to identify non-value adding activities in the case company's internal materials supply system to the welding process. And after that develop their current system to minimize identified activities. Based on this, a framework has been designed to highlight the factors to be taken into account when developing an internal materials supply system. Empirical material has been collected through interviews, observations, focus groups and archival material. To enable identification of nonvalue-adding activities, a process mapping has been established. Furthermore, tests have been carried out regarding internal materials supply processes to strengthen the author's proposal. Result/Discussion: The result of the study is a framework including eleven factors that companies should take into account when developing an internal materials supply system. The framework involves factors regarding, production variation, item specification, layout, suppliers, and communication. Conclusion: A total of 18 non-value adding activities was identified regarding Hörle Automatic's internal materials supply system in their welding process. The development of the internal materials supply system as proposed eliminates some of the identified nonvalue-adding activities performed by welding operators. The remaining activities are reduced through a new layout and that usage of more cost-effective personnel.
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Dick, Sami. "Preparation et proprietes de ceramiques composites dans le systeme al-zr-ce-o." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13154.
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La dispersion d'inclusions de zro::(2) dans une matrice d'al::(2)o::(3) permet d'ameliorer certaines proprietes mecaniques de la ceramique. Des materiaux a base de al::(2)o::(3)-zro::(2)-ceo::(2) ont ete prepares par fusion ou frittage. La fusion en atmosphere reductrice conduit a la disparition d'une partie de al::(2)o::(3) et zro::(2) sous forme d'aluminate et de zirconate de ce, ce qui degrade les proprietes mecaniques. Le frittage a ete realise sur des poudres obtenues par coprecipitation ou par procede sol-gel. La coprecipitation par nh::(4)oh a conduit a des melanges homogenes et densifies a plus de 94% a une temperature de frittage (1250**(o)c) relativement faible. La preparation par voie sol-gel a permis de controler dans certains cas la morphologie et la taille des particules. Les ceramiques elaborees par ce procedelta e ont presente une mauvaise frittabilite meme aux alentours de 1400**(o)c
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Wang, Hsueh-Ming Steve. "Analysis of the effect of process parameters on material removal rate in ultrasonic machining /." Diss., 1998. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:9914251.
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Huang, Chih-Ling, and 黃芝玲. "Business Process Reengineering – The Quote Processing Process of a Food Raw Material Processing Company as an Example." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/wm2s2e.
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碩士國立中央大學
會計研究所企業資源規劃會計碩士在職專班
106
The rise of the Internet has made the technology and economy more prosperous and progressive, the information transmission has been faster and more convenient, and the product life cycle has been shortened. Enterprises have been guided by customer demand, so enterprises need to have more rapid response capabilities to respond to the market. I am impatient. In recent decades, the challenges faced by enterprises have been changing with each passing day, the environmental issues of global attention, and the labor issues and food safety issues discussed in recent years. In addition to the above-mentioned major environmental problems, customers’ requirements for product prices, quality and services are also Increasingly, in such a difficult situation, the key to the future of the company is to have core technology and flexible operational capabilities. A correct and effective business strategy is a prerequisite for a company to have a competitive advantage. Turning the strategy into concrete action and continuing to promote it through existing resources requires sufficient maintenance management capabilities to achieve the goal and achieve outstanding results. business performance. In order for the strategic objectives to be successfully achieved, the organization must have a clear division of responsibilities, which depends on a clear and efficient organization process, and good and effective communication of the team, so that employees are highly cohesive. However, due to the over-emphasis on flexibility and the importance of corporate process management, many small and medium-sized enterprises in Taiwan are so low that the "cost" and "time" of improving the competitiveness of enterprises can be mastered, making corporate decision-making highly dependent. The intuition of decision makers. For traditional manufacturing, not only advanced and superior science and technology, improved product quality, and lower operating costs are required, but the appropriate process is a key advantage for successful companies compared to competitors. More importantly, continuous inspection and optimization of enterprise process management. In order to strengthen competitiveness and achieve the goal of sustainable development. Therefore, the transformation of strategy as the execution ability of specific actions is more important for the achievement of business strategy objectives. This study is aimed at the organizational structure of the case company, the key process of the company's operation, the business quotation operation process, by sorting out the operation process, removing the unreasonable and inefficient work in the process, and using the revised daily operation form to control the operation process may cause Waste, and put KPI into the form, and develop key performance measures after organizational process optimization and transformation.
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吳澤宏. "Study of the grey relational method for the optical plastic material cutting using CO2 laser process." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/34754753298604206536.
Full textAbstract:
碩士國立彰化師範大學
機電工程學系
96
Using milling machine or CNC in the traditional cutting process is one of major method for cutting PMMA materials. Both surface roughnesses will gradually worsen and tool replacement cost will increase for cutting PMMA due to tool wear. This study fabricates PMMA by CO2 laser processing system to melt and vaporize it. The focal length for CO2 laser processing is dominated by a precise close-loop control module. The major factors of laser cutting process are the assist gas flow rates, laser repetition rate, the laser focal length and feed rates of XY stages, respectively. Each of factors has tree factor levels and the factors design is used Taguchi original array. In this experiment, measuring surface roughness and optical power ratio can determine its laser cutting quality for PMMA. Using grey relational method can fast find out the best cutting factor for laser cutting process after Taguchi original array. There are three experimental conditions, could be obtained. It is shown in the following: 1.The factor characteristic from Taguchi method can be analyzed by grey relation method. 2.Using Taguchi method and grey relation method can find out the best cutting conditions for PMMA. 3.One of the important factors in laser cutting process can be find out from its response table of grey relation grade. Using Taguchi quality theory reduces cost and the experimental set-up time for same experimental processing. Combining grey relation method obtains one of the best cutting conditions under multi-analyses. This unique and mixer method can effective analyze cutting quality and fast find out the best cutting conditions on PMMA with CO2 laser.
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Chen, Hsueh-Jen. "Design and implementation of a system for integrating material and process selection in automated manufacturing." Thesis, 1992. http://hdl.handle.net/1957/36709.
Full textAbstract:
Today's manufacturing environment is characterized by competition and
continuous change in product and process requirements. The concept of
"design for manufacturability" integrates product specifications with
manufacturing capabilities by considering the design and manufacturing
phases as an integrated system, evaluating the combined system during
the design phase of a product , and adjusting the design for maximum
efficiency and production economics.
This research focuses on one aspect of design for manufacturability,
that of process technology evaluation for a specified product design.
The objective of the proposed system developed in this study is to
evaluate technology alternatives for manufacturing a specified part
design and to identify the best combination of product-process
characteristics that would minimize production costs within the
constraints set by the product's functional requirements and available
processing technology.
The research objectives are accomplished by developing a simulation
based analysis system. The user inputs product specifications through
structural screens. The system maintains data bases of work and tool
materials, and machining operations. Based on user input, the system
then extracts appropriate information from these data bases, and
analyzes of the production system in terms of production economics, and
other operational measures such as throughput times and work-in-process
inventories. Sensitivity analysis may then be performed to explore
tradeoffs in design and production parameters. The system is completely
integrated, and a user with no prior experience of either simulation or
data base technology can use the system effectively.Graduation date: 1992
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Lee, Chang-Lun, and 李昌崙. "Advanced Composites Based on Epoxies and Bismaleimides by Resin Transfer Molding (RTM) Process - Material Characteristics and Processing." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/79303618616956565425.
Full textAbstract:
博士國立交通大學
材料科學與工程系
88
Resin transfer process (RTM) is being considered as an alternate to the traditional prepreg lay-up/autoclave curing process for the manufacture of high performance composites because of its economics and flexibility. In RTM, a pre-catalyzed resin is injected under pressure into a fibrous preform in a hot closed die mold, then in-situ curing the resin to form the final parts. This study involves a resin transfer molding (RTM) process for making advanced composites based on high performance epoxies and high temperature resistant bismaleimide (BMI) resins. The curing kinetics and viscosity change of resins during the mold filling stage were studied and simulated with appropriate kinetic and rheological models. The effects of processing variables including injection temperature, injection pressure, gating arrangement, fiber volume fraction and fabric structure on the processing and performance of the resulting composites were investigated. The produced composites possess fiber volume fraction higher than 55﹪and void content lower than 1﹪. The glass transition temperature (Tg) is 208℃ and flexural strength reaches 585Mpa for 1581/PR500 fiberglass epoxy composites. For 1581/CPA-2350 fiberglass bismaleimide (BMI) composites, the Tg is 316℃ and flexural strength reaches 613Mpa. Moreover, the flexural strength of carbon fiber BMI composites approaches 808Mpa. A modified Kamal''s kinetic model was adapted to describe the autocatalytic and diffusion-controlled curing behavior of PR500 epoxy resin over the temperature range of 160-197℃and of LY564/HY2954 epoxy resin over the temperature range 50-80℃for resin transfer molding (RTM) process. The cure reaction of CPA-2350 BMI resin follows first order kinetics over the temperature range of 115-145℃ in the initial stage of the cure reaction. An empirical model correlated the resin viscosity with temperature and the degree of cure for LY564/HY2954 epoxy and CPA-2350 BMI was obtained. Predictions of rate of reaction and resulting viscosity change by the modified Kamal''s model, first order kinetics and the empirical rheological model agreed well with the experimental data for the mold filling stage of the RTM process. The optimized physical and mechanical performance of PR 500 epoxy based glass composites was obtained by processing the resin at 160℃under 392 kPa pressure. At 150℃resin temperature, restriction of resin flow and reduction in mechanical performance of the resulting composites were found due to particulate filtration of the hardener from resin matrix. Molding of highly permeable EF420 fabric required shorter mold filling time, but resulted in reduced flexural strength and storage modulus as compared to those of 1581 fabric. In RTM process of LY564/HY2954 two-part epoxy, molding aged resin with 55﹪fiber exhibited twice mold filling time and caused a 7-15﹪deterioration in the interlaminar shear strength(ILSS) and in the flexural strength of the composites as compared to that of the composites molded with fresh resin. At 55﹪fiber volume fraction, composites molded with aged resin resulted in 35﹪longer filling time, and 4-12﹪decreased ILSS and flexural strength as compared to that of the composites at 44﹪fiber volume fraction. Moldings with the perimeter inlet exhibited 65﹪shorter mold filling time, 28﹪reduced void content and 6﹪improved flexural strength as compared to that of the composites molded with the center inlet. As compared with those of PR500 epoxy, composites based on LY564/HY2954 epoxy resin behaved lower flexural strength (585Mpa vs. 394MPa), higher void content (0.37﹪vs. 0.83﹪) and lower Tg (208℃ vs. 153℃). For CPA-2350 BMI based carbon composites, better mechanical properties and less void content were obtained for moldings at 125℃ and 135℃ as compared to moldings at 115℃ and 145℃. Decreased mold filling time, lowered void content and improved mechanical properties were observed with increasing injection pressure for moldings processed at 125℃. Moldings with a center inlet resulted in 3.8 times increase in mold filling time, 3.7﹪increase in void content and 3.3﹪decrease in flexural strength as compared with a perimeter inlet. Composites with 52﹪carbon fiber exhibited lower void content and higher mechanical properties as compared to those of 58﹪carbon fiber. In contrast to glass fiber counterpart, carbon fiber contributes to the superior mechanical performance of their composites due to the exceptional strength and modulus. Among moldings of varied fiber fraction and fabric structure, the higher fiber volume fraction is the key factor that resulted in the higher voids trapped in the resulting composites.