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Dissertations / Theses on the topic 'Thin-walled parts'
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1
Kolluru, Kiran V. S. S. "On design and simulation of passive damping solutions for milling of thin-walled parts." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/14427/.
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Machining of thin wall structures is a challenging area due to the problems such as chatter and forced vibrations that arise due to low stiffness of such structures. Up to now, most of the research was driven by need to improve productivity in manufacturing of aircraft components such as airframe panels; hence, straight thin walls such as cantilever structures were considered for research in machining dynamics. However, thin wall casings and particularly thin wall assemblies that are encountered in jet engine casings are not well studied. Not only their dynamics is quite different from that of straight thin walls, they present a different set of challenges for fixturing to minimise machining vibrations. Hence, there is a two-fold need of research: (i) to understand the effect of dynamics of thin wall casings on interaction of tool and workpiece and (ii) to design and validate damping solutions to minimise machining vibrations in such structures. In this work, both the above objectives are addressed. Initially a coupled dynamic interaction of tool and workpiece is studied through experimental analysis of machining vibration signal. This study was carried out both on a straight thin wall cantilever and on a thin wall casing to present the effect of variation of dynamics on dynamic coupling between tool and workpiece. The machining vibration signal was analysed in frequency and time-frequency domain to see which of the elements (tool or workpiece) are dominant during machining. For providing fixturing solutions to minimise machining vibrations, initially tuned mass dampers were studied. Tuned dampers with increased mass ratio were studied to see their effect in minimising vibrations. Subsequently, two novel surface damping solutions - viscoelastic based surface damper and torsion spring fixture - were proposed and validated experimentally. The design philosophy behind both these solutions is to improve mass and stiffness of the casing in addition to imparting damping. Finite element modelling was carried out to predict the dynamic response without and with proposed solutions.
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Ступін, Борис Анатолійович, Борис Анатольевич Ступин, Borys Anatoliiovych Stupin, Андрій Юрійович Довгополов, Андрей Юрьевич Довгополов, Andrii Yuriiovych Dovhopolov, and Д. М. Хропко. "Повышение точности при обработке тонкостенных деталей." Thesis, Сумский государственный университет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/66722.
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В машиностроении, авиастроении, приборостроении, и других
отраслях машиностроения, распространённым видом изделий являются
нежесткие тонкостенные детали. Обработка таких деталей связана с рядом
сложностей, таких как: недостаточная жесткость заготовки и в целом
технологической системы, деформация детали при закреплении ее на станке.
Деформации влияют на точность детали после обработки. Соответственно,
достижение заданных параметров точности обработанной поверхности
становится сложной технологической и производственной задачей.
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Довгополов, Андрій Юрійович, Андрей Юрьевич Довгополов, Andrii Yurijovich Dovgopolov, Сергій Сергійович Некрасов, Сергей Сергеевич Некрасов, and Serhii Serhiiovych Nekrasov. "Приспособление для закрепления тонкостенных деталей." Thesis, Сумский государственный университет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/39457.
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В современном машиностроении используется большое количество
тонкостенных деталей. В то же время, повышаются требования к точности
деталей, в связи с новыми потребностями машиностроительной отрасли в
точных, но не дорогих деталях. Получение точных недеформированных
деталей является очень сложной и трудоемкой задачей. Поэтому поиск путей
и методов зажима тонкостенных деталей – задача актуальная и имеет
большое народнохозяйственное значение.
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Гермашев, А. И. "Методика исследования колебаний при фрезеровании тонкостенных деталей." Thesis, Сумский государственный университет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/38085.
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В авиакосмической отрасли широко применяются детали, имеющие тонкостенные элементы, которые получают путем концевого фрезерования на современных станках с ЧПУ. Из-за прерывистости процесса обработки и недостаточной жесткости тонкостенных элементов происходит появление вибраций, которые снижают качество обрабатываемой поверхности, геометрическую точность, стойкость инструмента и т.д.
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Stephenson, Richard C. "Comparing the Feasibility of Cutting Thin-Walled Sections from Five Commonly Used Metals Utilizing Wire Electric Discharge Machining." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1948.pdf.
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Kafka, Richard. "Vývoj SLM procesních parametrů pro tenkostěnné díly z niklové superslitiny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443180.
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The diploma thesis deals with the development of process parameters of SLM technology for the material IN718. The main goal is an experimental development of a set of parameters for the production of thin-walled parts with regard to material density, surface roughness and tightness. The essence of the development of parameters is an experimental explanation of the influence of laser power and scanning speed on the morphology of single tracks, which are used for the production of a thin wall. Together with walls of larger widths and volume samples, it is possible to create an intersection of parameters by which is possible to create components formed by a combination of thin-walled and volume geometry. The performed research created a material set, where the parameters of thin walls are used for the area of contours of bulk samples. We managed to produce a wall with an average width of 0.15 mm and roughness of 6 m, which meets the requirement for the tightness. The meander scanning pattern achieved a relative material density of 99.92%, which is more than with the supplier's parameters. Based on the acquired knowledge, it was possible to apply a set of parameters to components combining both geometries.
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Procházka, Luděk. "Silové zatížení frézovacích nástrojů při obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-379018.
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The thesis deals with the problem of force loading during machining of thin-walled parts. In the theoretical part, the force load applied during milling and the possibility of measuring of the force loading during milling is analyzed. Further the work focuses on the machining of thin-walled parts, problems in machining of these parts and the possibility of eliminating these issues. The practical part deals with the design and realization of the measurement of the force load on the selected components. The thesis also presents a comparison of the simulation model of deflection of thin-walled parts with the values measured in real machining.
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Міненко, Дем`ян Олександрович, Демьян Александрович Миненко, Demian Oleksandrovych Minenko, and А. П. Антонов. "Получение узлов крепления в тонкостенных деталях." Thesis, Сумский государственный университет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/40282.
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В машиностроении широко используются тонкостенные детали с узлами крепления: корпуса, поддоны, крышки, теплообменники, коллекторы, элементы трубопроводов и т. д. Узлы крепления в тонкостенных деталях традиционно изготавливают с использованием дополнительных крепежных элементов: гаек, резьбовых вставок, шпилек, которые закрепляются с помощью сварки, пайки или прессования.
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Janovský, Petr. "Aplikace měřicích sond v procesu frézování na stroji MCV1210/Sinumerik 840D." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378862.
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This thesis concerns the technological processes of machining of thin-walled parts and the modification of said processes in dependence on the following interopera-tive measurement of the real dimensions of these parts. Within the theoretical part a research study of technological possibilities of measuring thin-walled parts and principles of probe programming are presented. In the main practical part of the the-sis a proposal of an experiment is described, which tests the individual technologi-cal steps and their influence on the quality of a prototype of the produced thin-walled part. Numerical (NC) codes are created using parametric programming, which are then used during the realization of the experiment itself. In the conclusi-on there are presented and discussed the results of measuring of the machined surfaces and the influence of correction paths, which should help to achieve a mo-re accurate production according to given dimensions. This experiment, however, has not met the expected results. That is why new procedures have been designed in order to create said paths, which can be used in a future realization of this expe-riment.
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Spáčil, Radek. "Analýza řezání tenkostěnných součástí pilou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-379007.
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Master‘s thesis deals with sawing of the thin-walled parts with high speed steel slitting saw. At first the most used conventional and unconventional possibilities of materiál cutting are described by a form of search. The next chapter describes forces arising from splitting saw machining, including their dependence on a specific cutting force, a chip cross section and a engagement angle. The second part of the thesis deals with the technological improvement of the cutting process, where three possible solutions are considered – geometry of the cutting tool, PVD coating deposition of the cutting tool and process fluid change. In the experimental part non coated slitting saw with burrs, non coated deburred slitting saw and coated slitting saws are compared. Used coatings were Ti(C,N), Cr-Al-Si-N, Al-Cr-B-N, and TripleCoating Cr, which is consisting of three layers TiN + (Al,Ti)N + Cr-Al-Si-N. The experiment has shown that the cutting forces inceases as the edge radius and wear level of the cutting tool increases. Coated cuttung tools has shown lower differences between the first and the last cut. Slitting saws have been also used in real cutting process to verify experimental results.
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Mana, Marek. "Možnosti stroje Vernet Behringer při CNC programování." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231234.
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The master’s thesis is focused on the possibilities of machining lines of the company Vernet – Behringer. The theoretical part is a brief inclusion of the control system ProNC2 between selected commercially available control systems and are compared ways of programming CNC machine tools. On the machine tool of company Vernet – Behringer are processed mainly thin-walled components, that is why is part of the work focuses on the issue of machining thin-walled parts, the distribution of deflection tools and machined parts. The next part of thesis deals with the design and processing of technical documentation for the machined model part. The practical part deals with the possibilities of the machine and method of programming the control system ProNC2. Programming and practical production on machine were proceeded in company SSI Schäfer s.r.o. The work is focused on practical verification of the production process using simulation and production itself. Finally, it was performed technical - economic evaluation of production.
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Gerasimenko, Artem. "Etude analytique et expérimentale de l’usinage d’un tube mince." Thesis, Paris, ENSAM, 2016. http://www.theses.fr/2016ENAM0076/document.
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Ce travail de thèse se concentre sur l’étude du comportement dynamique des tubes minces durant leur usinage par tournage et notamment sur la survenue du broutement régénératif. L’étude de l’usinage de ce type de pièce est pertinente car ces pièces font l’objet d’une large diffusion dans divers domaines industriels tels que la construction aéronautique (notamment moteurs), la construction navale, la production de fusées. Ces pièces ayant une faible rigidité, il est fréquent que des vibrations indésirables se produisent en cours d’usinage. Il est donc intéressant d’être à même de les prédire pour les éviter.L’approche proposée vise à permettre un choix rapide et efficace des conditions de coupe, et notamment des profondeurs de passe, pour cette opération d’usinage. Pour cela nous proposons de mettre en place un modèle mécanique analytique du tube (modèle de coque mince utilisant un nombre réduit de degrés de liberté) de manière à réduire les coûts numériques et à faciliter l’analyse du phénomène. L’impact de la taille du modèle sur les résultats est étudié (nombre de formes propres) ainsi que de la prise en compte de l’enlèvement de matière (évolution du comportement dynamique) et du déplacement de l’outil. Afin de valider l’approche une expérience a été mise en place et est également présentée dans ce mémoireThis work focuses on the study of the dynamic behavior of thin tubes during their machining by turning and gives particular emphasis on the occurrence of regenerative chatter. The study of machining of this type of workpiece is relevant because they are widely used in various industrial fields such as aircraft construction (including engines), shipbuilding, rocket production. As these parts have low rigidity, it is common that undesirable vibrations occur during machining. It is therefore of interest to be able to predict them in order to avoid them.The proposed approach is designed to enable a fast and efficient selection of cutting conditions, including cutting depths for this machining operation. We thus propose to elaborated an analytical model for the dynamics of the tube (thin shell based model using a reduced number of degrees of freedom) to reduce the numerical costs and to facilitate the analysis of the phenomenon. The impact of the size of the model on the results is studied (number of shape functions), as well as the impact of material removal (evolution of the dynamic behavior) and of the motion of the tool. An experiment, presented in this thesis, was also set up in order to validate the approach
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Barcuch, Jakub. "Optimalizace nástrojové řezné geometrie pro vysokorychlostní obrábění tenkostěnných součástí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230450.
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The theoretical part of the thesis deals with materials used in the aircraft industry with a focus on aluminium alloys. Then it describes high speed machining, its characteristics and its comparison with conventional machining. The following chapters describe strategies of machining thin-walled parts and a description of vibration that occurs during machining. The practical part deals with selection appropriate tool geometry, machining of thin-walled parts and evaluation of their deflection during machining.
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Koubek, David. "Analýza silového zatížení při obrábění hliníkových slitin monolitními frézami ze slinutého karbidu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241851.
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The aim of this thesis is to create the proposal and expansion of knowledge in the field of experimental measurement of force load when milling thin-walled parts made of aluminum alloy monolithic cylindrical shank cutter of cemented carbide (hereinafter referred to as CC). It also discusses the theoretical analysis of the forces generated during milling, and practical approaches to their measurement experiments. This work also deals with the analysis of aluminum and its alloys. The next chapter describes the appropriate strategy for the machining of thin-walled components including defining the problems, that can complicate machining thin walls. The practical part deals with prediction and a following suggestion of the experiment measuring the power load. The last section is devoted to the practical implementation of the measurement of forces during the milling of thin-walled parts with subsequent evaluation and comparison of strength for the record selected from CC carbide tools, including evaluation of roughness parameters.
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Mundim, Rafael Borges. "Evaluation of strategies for milling of thin-walled aluminum components." Instituto Tecnológico de Aeronáutica, 2014. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2962.
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A considerable amount of research has focused on machining dynamics due to the impact it lays upon productivity and quality. Models have been developed with an ever-increasing accuracy in order to predict the dynamic behavior of cutting tools under different circumstances. However, workpiece behavior during machining is also a current limiting factor which is dealt with by means of restricting product designers of using features with thin characteristics. For this reason, designed products will be often oversized due to machining technology restrictions related to dimensions of thin walls. The main objective of this work is to investigate the behavior of thin walls during milling in order to identify the challenges imposed by the process. Different strategies are tested and evaluated through force signals, finite element analysis (FEA), analytical models, and analysis of the machined parts. Cantilever walls with varying dimensions are tested and the height-to-thickness (H/t) ratio often found in literature as a guideline is discussed. Waterline, low stock, constant force, and passive damping strategies are evaluated and their applicability, advantages, and restrictions are discussed. The effect of cutting speed on cutting force is investigated from a force and excitation frequency standpoint. A method for prediction of resonance based on a frequency chart is proposed, for which variable speed tests are conducted. This variable speed approach is based on prediction of stable paths as machining progresses by means of the proposed chart. Validation of the frequency chart construction method is presented along with its applicability and restrictions considering a more complex geometry. Results indicate that the frequency chart method can be used to predict and explain the occurrence of instability but limiting factors still lie in implementing and improving the proposed method.
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Chuvashev, Anton. "Frézování tenkostěnných součástí pro letecký průmysl." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241845.
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This diploma thesis deals with issues in machining of thin-walled components. Its first part describes materials used in the aircraft industry. Then it focuses on issues associated with the prediction of deflections of a rib wall during machining. Later on it focuses on different methods and strategies of thin-walled part milling. The diploma thesis also describes an experiment of manufacturing thin-walled components in the form of ribs and evaluation parameters such as roughness, perpendicularity and straightness deviations, width of the rib and force loading of a cutting tool as measured by various gages. The final part is devoted to a calculation of the specific cutting force and its comparison with its theoretical value.
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Laforce, Francois. "Zlepšení výroby aeronautické součásti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229843.
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Since aircrafts manufacturers intend to produce low consumption and efficient aircrafts, parts become more and more difficult to machine. Some processes like „air machining“ enables a one-step production for complex aluminium alloy shaped parts. Although the assembly offers a large access to cutting tool, the lack of stiffness for large parts, and especially for thin-walled aeronautics parts implies strong vibrations during machining. The aim of the study is to solve these difficulties in order to keep productivity and improve surface quality. Further innovative solutions are considered like modal analysis, in-phase machining, spindle speed variation, 3 flutes end mill and variable helix angle mill. All propositions are tested on DMG 65 machine tool with Siemens 840D controller. Although vibrations are intrinsic to flexible parts, surface quality has been improved with higher cutting continuity and variable helix angle cutting tool.
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Liu, Jianxia. "Fixture design for thin-walled parts." 1993. http://hdl.handle.net/1993/17784.
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Cheng, Tseng-Jen, and 鄭淙仁. "A Precision Cold Forging Process Study for High Aspect Ratio of Thin-Walled Shell Part." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/18267614341112125786.
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碩士國立高雄第一科技大學
機械與自動化工程所
94
Abstract In this study, the aims were to analyze the cold forging process of Impact Extrusion - Ironing Method and to investigate the design of the mechanism applied in the AISI 1035 thin-walled shell part forging die set. First of all, the DEFORM software was used to simulate the Impact Extrusion, Reduced Gauge, as well as Ironing process and to investigate the feasibility for that process. To concern the proper way of cold forging forming and avoid work hardening, the heat treatment, such as Process Annealing were used. The actual forging experiment was performed to test and verity the feasibility for that process. The results show that after Process Annealing, when performing the Impact Extrusion by crank press forging machine with shrinkage rate77.4%, the maximum load was252 tons. Process Annealing was used to avoid work hardening proble in this experiment before the first step of forming. When performing the first step of Ironing forming was performed by oil press machine with ironing rate 60%, the maximum load was 17tons. When performing the second step of Ironing forming with ironing rate 66.7%, the iii maximum load was 13tons. .And when performing the third step of ironing forming with ironing rate 75%, the maximum load was12tons. To avoiding work hardening, the last step of the experiment the Process Annealing was used. For effective heat treatment, the Ironing forming was performed by oil press machine with ironing rate 60%. The maximum load was 20tons. The target vehicles were forged successfully by the developed die set and the flow lines of the forgings were reasonable.