Thematische Bibliographien / Forming threads

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Auswahl der wissenschaftlichen Literatur zum Thema „Forming threads“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 11. Februar 2022

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Zeitschriftenartikel zum Thema "Forming threads"

Heiler, Roland. „Cold thread Forming – the chipless alternative for high resistant internal threads“. MATEC Web of Conferences 251 (2018): 02046. http://dx.doi.org/10.1051/matecconf/201825102046.

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In the area of construction and mechanical engineering the designers and production engineers very often do have the task to produce high resistant connections with the possibility of assembling and de assembling parts in a wide range of different materials. Most often connection bolts and internal threads are used to fulfill this task. To produce the internal threads typically the three following internal threading technologies are used: tapping, cold thread forming and thread milling. Tapping and thread milling are metal cutting technologies but cold thread forming is a chipless alternative. Due to the cold forming of the thread this process does have several benefits in comparison to the traditional cutting technologies, but also some special features and process characteristics have to be considered, that it is possible to produce reliable internal threads. In the article the technology is presented with information about the process characteristics, the modern tools design and typical application areas. Results of pull out tests are showing the possibility for producing high resistant threads.

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Zhang, Shuowen, Shuqin Fan, Peng Dong, Yangfeng Cao und Shengdun Zhao. „The importance of forming parameters on rolling process and the performances of component in forming long threads“. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 234, Nr. 1 (10.10.2019): 29–36. http://dx.doi.org/10.1177/0954408919879823.

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The axial self-infeed rolling process is an advanced and efficient process to form long threads such as lead screw and thread shaft. The experiments of axial self-infeed rolling process for the stainless steel were conducted with three blank diameters, forming speeds and two lubrication conditions. The effects of forming speed, blank diameter and lubrication condition on forming torque, microhardness and tooth height of forming threads were analyzed by the design of experiment and analysis of variance. And the characteristics of forming torque, microhardness distribution and tooth height were investigated. The results revealed the forming torque was more influenced by the blank diameter and the forming speed than the lubrication condition. The tooth height was sensitive to all these factors and the microhardness only was affected by the blank diameter.

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Rauf, Sakandar, Miguel A. Andrés, Olivier Roubeau, Ignacio Gascón, Christian Serre, Mohamed Eddaoudi und Khaled N. Salama. „Coating of Conducting and Insulating Threads with Porous MOF Particles through Langmuir-Blodgett Technique“. Nanomaterials 11, Nr. 1 (10.01.2021): 160. http://dx.doi.org/10.3390/nano11010160.

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The Langmuir-Blodgett (LB) method is a well-known deposition technique for the fabrication of ordered monolayer and multilayer thin films of nanomaterials onto different substrates that plays a critical role in the development of functional devices for various applications. This paper describes detailed studies about the best coating configuration for nanoparticles of a porous metal-organic framework (MOF) onto both insulating or conductive threads and nylon fiber. We design and fabricate customized polymethylmethacrylate sheets (PMMA) holders to deposit MOF layers onto the threads or fiber using the LB technique. Two different orientations, namely, horizontal and vertical, are used to deposit MIL-96(Al) monolayer films onto five different types of threads and nylon fiber. These studies show that LB film formation strongly depends on deposition orientation and the type of threads or fiber. Among all the samples tested, cotton thread and nylon fiber with vertical deposition show more homogenous monolayer coverage. In the case of conductive threads, the MOF particles tend to aggregate between the conductive thread’s fibers instead of forming a continuous monolayer coating. Our results show a significant contribution in terms of MOF monolayer deposition onto single fiber and threads that will contribute to the fabrication of single fiber or thread-based devices in the future.

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CZARNECKI, Henryk, Hubert MICHALCZUK und Michał TAGOWSKI. „CHANGES IN THE PROPERTIES OF THE SURFACE LAYER OF THE INTERNAL THREAD MADE BY COLD FORMING“. Tribologia 270, Nr. 6 (31.12.2016): 11–20. http://dx.doi.org/10.5604/01.3001.0010.6704.

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The study presents the influence of cold forming internal threads on the property changes of the surface layer of the obtained thread outline. As a result of material deformation, hardening increases, which increases the strength of the thread. In order to determine such changes, the distribution of microhardness was measured around the outline of the thread. The measurements and metallographic investigations permit the conclusion that such threading increases the microhardness of threads, especially on the sides of the outline, and its growth depends on the diameter of the initial hole. Microhardness testing helped to identify the changes in the area of unfilled apex of the thread. Metallographic images enable observation of the deformation zone and the fragmentation and orientation of the structure during the formation of the internal thread. The paper also presents the results of the fem simulation of thread cold forming process.

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Liu, Meng, Zesheng Ji, Rui Fan und Xingguo Wang. „Finite Element Analysis of Extrusion Process for Magnesium Alloy Internal Threads with Electromagnetic Induction-Assisted Heating and Thread Performance Research“. Materials 13, Nr. 9 (08.05.2020): 2170. http://dx.doi.org/10.3390/ma13092170.

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The casting magnesium alloy AZ91D cannot be extruded at room temperature. This paper presents a process for extruding internal threads using AZ91D heated by electromagnetic induction. The feasibility of the process is verified by finite element simulation and experiments. Using DEFORM-3D to simulate the process of extruding a M12 × 1.25 mm threaded hole by electromagnetic induction-assisted heating, the equivalent stress-strain and material flow law in the process of thread deformation was analyzed and verified by experiments. Three parameters—hole diameter, machine speed and heating temperature—were considered to study the influence of different process conditions on the forming torque. The results show that a heating temperature above 523 K can improve the plasticity of AZ91D. The hole diameter has an important influence on the forming torque. The forming process is not suitable for high-speed machining. The surface metal of the thread formed by this process has a strong deformation layer, which can improve the strength and hardness of the thread.

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Katzwinkel, Tim, Esanula Mohammad, Philipp Silberkuhl und Manuel Löwer. „THREAD ROLLING REPAIR METHOD FOR 3D PRINTED BOLTS“. Proceedings of the Design Society 1 (27.07.2021): 3141–48. http://dx.doi.org/10.1017/pds.2021.575.

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AbstractWithin this paper, a new method for the quality refinement of external metric standard threads on 3Dprinted bolts is presented. The repair method is based on the application of thread rolling technology, which is applied in terms of cold forming after the regular printing has been finished. The explorative study proves, that the investigated technology has a good potential to solve known precision issues in FDM 3D printing regarding the required accuracy for function fulfilling standardized threads. The application of thread rolling can be done manually and with minimal tool effort, which makes the technology particularly attractive for low cost applications.

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Agapiou, J. S. „Evaluation of the Effect of High Speed Machining on Tapping“. Journal of Engineering for Industry 116, Nr. 4 (01.11.1994): 457–62. http://dx.doi.org/10.1115/1.2902128.

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This paper summarizes tapping characteristics at speeds as high as 9,000 rpm (180 m/min surface speed) as compared to traditional tapping done at speeds from 500 to 1,500 rpm (20–30 m/min). High speed tapping was achieved by synchronizing the spindle rotation and the feed motion of a specially built machine at extremely high speeds and acceleration/deceleration rates. This investigation analyzes the performance of roll and cut tap geometries in the high speed tapping of 319 aluminum. The torque required by the different tap geometries at several speeds and percent threads combination is evaluated. The relationship between pretapped hole diameter and minor diameter of the thread and the estimation of percent thread are analyzed. The thread quality generated at high speeds is also evaluated. It is shown that the cutting speed does not affect the steady state torque and the shear strength. The torque for roll forming taps is higher than that for cut taps. The shear strength of roll forming threads increased with percent thread.

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Lee, H. W., Jung Han Song, Geun An Lee, Hye Jin Lee und K. D. Park. „Thread Forming of a Micro Screw for Storage Devices Using Finite Element Analysis“. Advanced Materials Research 264-265 (Juni 2011): 1613–18. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.1613.

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High precision micro screws have been widely required for the fastening parts of electronic storage devices. Teeth’s forming of the micro screw is generally utilized by a cold thread rolling process with a flat die. This process for micro sized parts has some difficulties such as the design of die shape, alignment between dies, and process managements. In this paper, it is focused on the effect of the alignment between dies and material, and process parameters in simulation. The investigated parameters are the friction coefficient and the relative position between stationary and moving dies using a numerical simulation. The simulations provide that the shear friction factor of 0.9 is proper for preventing slip between dies and raw material and the relative position of two dies has to be set to the half length of the pitch for maintaining the continuous thread profiles. The deformed shapes of the pitch part and the top part of threads can be demonstrated the feature of experimental result. The folding phenomenon appeared at the top part of threads, which seemed to be induced by a lack of the metal flow under micro sized deformation.

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Kamei, Nobuyuki, Hisaki Watari, T. Hatano und Youichi Kawamura. „Improvement of Local Decrease in Material Thickness of Fuel Supply Pipe“. Advanced Materials Research 264-265 (Juni 2011): 200–205. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.200.

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Growing demand for lightweight products has been increased by the rapid development of automobiles since the global environment conservation meeting at Kyoto. Lighter products have been necessary when considering in taking action to reduce fuel consumption. One of the key is the utilization of high strength and light materials, such as stainless, high-tensile strength steels and magnesium alloys, which are difficult to be formed due to their high strength compared to normal steel pipes. This paper is concerned with the development of pressing technology that copes with forming relatively high strength stainless pipe with screw threads on the surface of pipes. Our new press-forming process in order to obtain accurate screw threads on the stainless pipe was tested. A 3-D digitizer was used for the measurement of the accuracy of manufactured pipes by the proposed pressing method. It is found that the proposed our press-forming was effective to improve decrease of pipe thickness compared to conventional roll forming technology. The maximum decrease in material thickness was 20% using our press-forming process for screw threads in the formed pipe.

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Mehr Quellen

Dissertationen zum Thema "Forming threads"

Yermakov, Yegor. „Výroby závitů tvářecími závitníky“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318374.

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Tato diplomová práce se zabývá otázkami výroby závitů tvářecími a řezacímí závitníky. Její první část popisuje druhy závitníků, které se používají ve strojírenství. Pak se práce zaměřuje na otázky základních principů řezání závitů a tváření materiálu při obrábění. Dále se zaměřuje na porovnání řezných momentů a dalších veličin při aplikaci tvářecích závitníků v procesu obrábění. Výsledkem experimentu bylo zjíštění průběhů řezných momentů v závislosti na čase, který byly statisticky zpracovány a vyhodnoceny.

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Vnuková, Zuzana. „Vliv mazacích kapalin na průvodní veličiny tváření závitů“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444293.

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The main task of this work was to compare the being used process fluids in mechanical engineering with a focus on polymer and additive fluids. Selected polymer and nanoadditive fluids were compared based on a thread forming test, during which different concentrations of individual fluids were tested. All data from experiments were evaluated, assessed in terms of their properties, and recommended for further practice.

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Willens, David C. „Improving the Fatigue Life of Cylindrical Thread Rolling Dies“. Digital WPI, 2020. https://digitalcommons.wpi.edu/etd-dissertations/602.

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Thread rolling is a unique metal forming process which is commonly used to form screw threads on threaded fasteners and precision leadscrews at relatively high rates of speed. Threads are formed on a cylindrical blank by flat or cylindrical dies having the reverse form on them, which rotate and penetrate the blank simultaneously, to plastically deform it into a precise geometry. Thread rolling dies are exposed to a complex state of cyclical contact stresses that eventually cause the dies to fail by fatigue and wear. The stress state is not easily ascertained through standard analytical models due to complex geometry and process conditions. This research seeks to better understand the state of contact stresses present in cylindrical thread rolling dies as they form material, to aid in identifying and testing economical methods of improving thread rolling die fatigue life. Some work has been published on using FEA simulation software to model the thread rolling process, but no work has been published on using FEA software to analyze the stresses in thread rolling dies. DEFORM®-3D Forming Simulation Software by Scientific Forming Technologies Corporation in Columbus, Ohio was used to simulate the throughfeed thread rolling process and model the state of stresses in the dies. The results were compared to the Hertzian contact stress model and the Smith Liu equations for rolling and sliding friction. Fatigue life prediction methods involving S-N curves, surface fatigue strength, and Weibull probability distributions were tested using the simulation data against field results. An optimized die design was generated from a design of experiments simulating different die design geometry. Findings show that field failures correlate well to the DEFORM® simulation results. The Hertz model with Smith Liu equations improved correlation with the simulation. Fatigue life prediction models correlated reasonably well to field results using the simulation data for inputs. These findings can aid in selecting appropriate die materials, design parameters, and fatigue life treatments.

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Sedláková, Eva. „Technologická a ekonomická analýza výroby součástí pro automobilový průmysl“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401046.

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The thesis deals with an analysis of an existing technology of thread forming under various technological parameters used in car industry. Furthermore, it characterizes metric threads, their production and quality control, forming taps, process fluids and other process parameters. In the experimental part the experimental tests with a conventional and CNC drilling machines were carried out. The influence of various process fluids on surface and thread quality have been assessed statistically. The technical-economic evaluation of the process fluids and their effect on the technology has been made. The work supports a beneficial role of soap and polymers as convenient tribological means at thread forming.

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Dalmaso, Alice Copetti. „Fiandografia: experimentações entre leitura e escrita numa pesquisa em educação“. Universidade Federal de Santa Maria, 2016. http://repositorio.ufsm.br/handle/1/3503.

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Reading and writing walk together as experimentation in a doctorate research in the perspective of taking the reading of a text (or any other thing that we can come up with) that is not only interpretation, but is also experimentation. People experiment, avoiding the impetus of conclusions, risking themselves in a writing exercise that is not in debt to anyone or anything, a proposal or specifically the ideal of a text or a research in Education. The readings crossing the notions of reading and writing in this work, by authors such as Deleuze, Guattari, Barthes, and Larrosa, along with concepts of becoming and happening, allow me to think reading and writing as a (de)forming process. What can reading and writing produce as movement of learning, thinking, and living in a research in Education? The writing that moves and is moved, which is made along with the experimentation of reading, is developed in a fog of intention which persists between the crossings of life: such as unlearning a little about oneself, destroying things that do not want to be conceived as ours, but that are kept deep into the flesh. These (un)constitutions are about just one process: a doctorate student s process, a (de)forming process, any other process a process of how to experiment with reading and writing in a doctorate research in Education and with what is here called in a twisted and foggy way (de)forming, experimentation, learning. Thread-writing, name given to mean the construction of relations between reading and writing, composes a capable and open weave-fabric/texture that gives body to the research as a path, a trace-weave-sewing of writing threads in a research. This thread-writing persists in teaching, in shared spaces and times, together with the discourses that make us ill. Conjugating writings: a cure, an endless thread-writing.
Leitura e escrita caminham juntas como experimentação numa pesquisa de doutorado, na perspectiva de tomar a leitura de um texto (ou de qualquer outra coisa com a qual se encontre) que não apenas o/a interprete, mas que o/a experimente. Experimenta-se, abre-se mão do ímpeto de conclusões, arriscando-se, assim, a um exercício de escrita que não esteja em falta com alguém ou alguma coisa, uma proposta ou especificamente o ideal de um texto e de uma pesquisa em educação. As leituras que perpassam as noções de leitura e escrita neste trabalho, a partir de autores como Deleuze, Guattari, Barthes e Larrosa, junto aos conceitos de devir e acontecimento, permitem pensar o ler e escrever como processo (de)formativo. O que a leitura e a escrita podem produzir como movimento de aprender, de pensamento e de vida numa pesquisa em educação? A escrita que move e é movimentada, que se faz junto à experimentação da leitura, realiza-se numa névoa de intenção que persiste entre os cruzamentos da vida: o de desaprender um pouco sobre si mesmo, de destruir coisas que não querem ser dadas como nossas, mas que se mantêm encrustadas na pele. Trata-se, nestas (des)constituições, de apenas um processo: de uma estudante de doutorado, um processo (de)formativo, outro qualquer. Um processo de como se experimenta com a leitura e a escrita numa pesquisa de doutorado em educação e do que aqui, até então, tem-se chamado de forma torta e nebulosa de (de)formação, experimentação, aprendizagem. A Fiandografia, nome dado para dizer sobre a construção das relações entre leitura e escrita, compõe uma trama-tecido, passível e aberta, que vai dando corpo à pesquisa, como um caminho, um tracejar-tecer-costurar fios de escrita numa pesquisa; um fiandar que persiste em meio à docência, aos espaços e tempos que se compartilham, junto aos discursos que nos adoecem. Conjugar escritos: uma cura, um fiandar infinito.

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Kočka, Jiří. „Výroba konektoru“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231636.

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The diploma thesis deal with the proposal of connector manufacturing from bronze sheet CuSn6, thickness 1.5mm in production volume of 1.600.000 parts per year. From considered manufacturing variants there was chosen shearing and forming technology of thread in the progressive stamping die. For part production was selected pressing machine Bruderer 1250 with nominal pressing force 1250 kN from company E. Bruderer Maschinenfabrik AG. In the economical evaluation there were determined expenses 21.6 Kč per one piece including demanded profit. The turning point was calculated at production of 165.522 parts.

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Ostřížek, Lukáš. „Výroba závitové vložky objemovým tvářením“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229012.

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OSTŘÍŽEK Lukáš: Bulk forming technology of thread insert The Master's degree project, 2nd form, summer semester, academic year 2009/2010, educational group 5O/60 Mechanical Engineering - Manufacturing Technology, Brno University of Technology, Faculty of Mechanical Engineering, Institute of Manufacturing Technology, Dept. of Metal Forming and Plastics, May 2010. This project solves the manufacturing process of " Thread insert " part by technology of bulk forming. Part is made of 11 320 5R steel. Semifinished product has cylinder shape with dimensions of O13,5h11 – 9,1±0,2 mm. This part is made during five bulk forming operations on the HATEBUR AKP 3-5.

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Tjärnberg, Clara, und Sandra Gabrielsson. „"Det var en som ringde och önskade att läkarna började skära i mig utan bedövning" : – En kvalitativ studie om hot och hat mot opinionsbildande journalister“. Thesis, Umeå universitet, Institutionen för kultur- och medievetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-185049.

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The purpose of this study is to investigate how opinion-forming journalists in Västerbotten experience threats and hate and if these things vary depending on if the affected journalist is a woman or a man. This study also aims to examine how these threats and the hate affect the opinion-forming journalists in both an emotional and a professional way. To strengthen the analysis this study is based on four theoretical frameworks. Strömbäcks theories support analyzes about self-censorship and the opinion-forming journalists' importance for democracy. Butler's theories about hate-speech describe how hate-speech can be expressed and affect the receiver. Lazarus and Folkman contribute with a psychological perspective with coping strategies, how they cope with the threats and hate. The theories from Hanitzsch presents various perspectives about the journalistic cultures and supports analysis connected to the journalistic role. The method used to gather the material was qualitative interviews with six opinion-forming journalists in Västerbotten. For the analysis meaning condensation was used. The result presents a total of ten themes, sorted in three chapters based on the issues. The result and analysis indicates that threats and hate is common for opinion-forming journalists in Västerbotten to be exposed by. At the same time, a majority of the participating opinion-forming journalists state that they feel spared. Furthermore, it is very common for the opinion-forming journalist who receives threats or hate to be affected emotionally, mainly with negative emotions such as fear, sadness and discomfort. The biggest professional effect that threats and hate can lead to is self-censorship. Finally, this study can show that there are differences in threats and hate between female and male opinion-forming journalists in Västerbotten. The biggest difference is that women receive more threats and hatred based on sexism and containing sexual allusions.

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Hsieh, Hsiang-hsin, und 謝香欣. „A Study on Thread Forming for Magnesium Alloy Sheet Metal“. Thesis, 2009. http://ndltd.ncl.edu.tw/handle/58275474951537050675.

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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
97
Generally, the LCD panels to use a tapping of bore and the screw with bore to connect directly, but the material of structure must have enough thickness and strength, and have enough the number of screw and to avert the screw damaged when locked. The flange is the one of important process in sheet metal forming, and the main purpose of use as a connected and assembled after tapping. This study to achieve the forming simulation of flanging and tapping used the software of finite element method as DEFORM 3D. Using the DEFORM 3D to simulate with the parameter in the process, and to study the effect of process on each parameter. And design and manufacture the experimenting die to verify the accuracy of simulation. This article summarized the main parameters affect the process includes forming temperature, bore diameter of blank, flange forming, punch size. To M1, M2, M3 tap to explore the parameters. By the analysis result knew that the magnesium alloy is not good in 100℃ the forming causes the end product destruction. Forming temperature to 200℃ for the best working temperature. The holes flange forming highly also increases along with the forming punch diameter increases. When forming tapping billet have smaller diameter with better pitch.

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Chen, Ming-Yuan, und 陳銘源. „Optimal Study of Process Parameters for Sheet Metal Thread Forming“. Thesis, 2007. http://ndltd.ncl.edu.tw/handle/21846834198553318331.

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碩士
國立高雄第一科技大學
工程科技研究所
95
The structural components of the TFT-LCD and its frame exist a lot of screw holes which always have different diameters. These screw holes are provided for fixing one structural component to another one. Therefore, it is important to enhance the torsion of the screw holes so as to further increase the fixing strength of any two of structural components. This thesis mainly aims to find out the optimum parameters for the processing screw holes formed on a sheet. More specified, the Taguchi method, or so-called the Design of Experiments（DOE）, will be employed to find out a set of optimum parameters so as to obtain the optimum torsion, when processing the screw holes. In accordance with the design of the aforementioned optimum parameters, the processing cost of the screw holes can be efficiently decreased and the quality of the sheet metal can be further increased. Three kinds of sheet including SUS304, SUS430 and SPTE will be selected to be discussed in this thesis. Each of sheets also has two different kinds of thickness which are 0.3mm and 0.4mm respectively. Accordingly, the three different sheets and two different thicknesses can form six different combinations for testing. About reaching the customer needs torsion 2.0kg-cm. The six combinations can obtain optimum torsions when the process parameters operate in SUS304 under the conditions of the pre-pressed hole of 0.9mm, the thread match rate of 100%, and flanging ratio of 0.8t .

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Bücher zum Thema "Forming threads"

Radnitz, Scott. Revealing Schemes. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197573532.001.0001.

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Conspiracy theories have come to play an increasingly prominent role in political systems around the world. In Revealing Schemes, Scott Radnitz moves beyond psychological explanations for why people believe conspiracy theories to explore the politics surrounding them, placing two questions at the center of his account: What leads regimes to promote conspiracy claims? And what effects do those claims have on politics and society? Focusing on the former Soviet Union—a region of the world where such theories have long thrived—he shows that incumbent politicians tend to make conspiracy claims to demonstrate their knowledge and authority at moments of uncertainty and threat. They emerge more often where there is serious political competition rather than unbridled autocracy and in response to events that challenge a regime’s ability to rule. Yet conspiracy theories can also be habit-forming and persist as part of an official narrative even where immediate threats have subsided—a strategy intended to strengthen regimes, but that may inadvertently undermine them.

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Stein, Elizabeth Ann. Information and Civil Unrest in Dictatorships. Oxford University Press, 2016. http://dx.doi.org/10.1093/acrefore/9780190228637.013.35.

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Considering incidents that make headline news internationally, given the modern information and communication technology revolution, the facility of citizens to rapidly mobilize represents a considerable threat to autocratic survival. While the speed with which popular movements emerge has increased exponentially, and the news of their existence spreads faster and farther, civil unrest has threatened the stability and survival of dictators for centuries. The paranoia and machinations of dictators depicted in films, such as the portrayal of Ugandan dictator Idi Amin in The Last King of Scotland, while sensationalized, capture the astounding array of threats with which unelected leaders must concern themselves. On the one hand, they must worry about insider threats to their standing, such as conspiratorial plots from people within the dictator’s own circle or mutiny among government soldiers. On the other hand, dictators also must monitor threats originating from non-regime actors, such as new alliances forming among once-fragmented opposition groups or the possibility of sustained insurgency or a popular revolution. From force to finesse, autocratic leaders have developed a broad and evolving range of tactics and tools to diminish both internal and external domestic threats to their reign. The success of dictators’ endeavors to insulate their regimes from forces that might challenge them depends on accurate and reliable information, a resource that can be as valuable to the leader as would a large armory and loyal soldiers. Dictators invest significant resources (monetary as well as human capital) to try to gather useful information about their existing and potential opponents, while also trying to control and shape information emitted by the regime before it reaches the public. New information and communication technologies (ICTs), which have drawn a great deal of scholarly attention since the beginning of the 21st century—present both risks and rewards for dictators; inversely they also create new opportunities and hazards for citizens who might utilize them to mobilize people opposed to the regime. While civil unrest could encompass the full range of domestic, nonmilitary actors, there also needs to be a specific focus on various forms of mass mobilization. Historically, more dictators have been forced from office by elite-initiated overthrows via coups d’état than have fallen to revolution or fled amid street protests. Civil unrest, in its many forms, can affect autocratic survival or precipitate regime breakdown. While mass-based revolutions have been a relatively rare phenomenon to date, the actions of many 21st-century dictators indicate that they increasingly concern themselves with the threats posed by popular protests and fear its potential for triggering broader antigovernment campaigns. The ease of access to information (or the lack thereof) help explain interactions between authoritarian regimes and citizens emphasizes. The role of information in popular antigovernment mobilization has evolved and changed how dictators gather and utilize information to prevent or counter civil unrest that might jeopardize their own survival as well as that of the regime.

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McCarthy, Michael. Museums and Maritime Archaeology. Herausgegeben von Ben Ford, Donny L. Hamilton und Alexis Catsambis. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780199336005.013.0045.

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This article reflects the role of universities, training institutes, foundations, and conservation laboratories in presenting an in situ underwater display case at an excavation, or a wreck, submerged structure, or dwelling. Therefore, the term “museum” includes both traditional museums as well as institutions that curate and display archaeological data. Museums represent one of the main outlets for maritime, underwater, and nautical archaeological materials. This article describes the early collection strategies of the archaeological data and explains how this concept came into being. Many prominent maritime archeologists were drawn in into universities, forming study collections. Some of these evolved into private museums. This article highlights threats to museums and maritime archaeology, such as lack of resources. There will be great excavations, recording, and raisings of relics, ships, and structures. The trend of bold new maritime archaeological museums is already visible in some countries, and will continue in the foreseeable future.

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The 2006-2011 World Outlook for Dies with Two or More Thread-Forming Edges Integral with the Body for Machine Tools and Metalworking Machinery Excluding Metalworking Dies. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for Dies with Two or More Thread-Forming Edges Integral with the Body for Machine Tools and Metalworking Machinery Excluding Metalworking Dies. ICON Group International, Inc., 2006.

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Baillie, Les, und Theresa Huwar. Anthrax. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780198570028.003.0006.

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Anthrax is caused by the bacterium Bacillus anthracis, a Gram-positive aerobic spore-forming bacillus, primarily infecting herbivores. Although rare in the developed world the organism remains a threat to livestock in African and Asian countries where control depends on appropriate animal husbandry approaches such as vaccination and disposal/decontamination of carcasses. Animals are thought to contract anthrax by ingesting spores from contaminated soil while humans become infected via contact with diseased animals, their products or as a consequence of acts of bio-terrorism such as occurred in 2001. This unprecedented act has stimulated a burst of research, shedding new light on the biology of the organism and its ability to cause disease. It is to be hoped that this renewed interest will see anthrax once more regain the status of an exotic disease of antiquity.

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Cheng, Christine. Extralegal Groups in Post-Conflict Liberia. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199673346.001.0001.

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In the aftermath of the Liberian civil war, groups of ex-combatants took control of natural resource enclaves. With some of them threatening a return to war, these groups were widely viewed as the most significant threats to Liberia’s hard-won peace. Building on fieldwork and socio-historical analysis, this study shows how extralegal groups emerge as a product of livelihood strategies and the political economy of war. It analyzes the trajectory of extralegal groups in three sectors of the Liberian economy: rubber, diamonds, and timber. The findings offer a counterpoint to the prevailing narrative, arguing that extralegal groups have a dual nature and should be viewed as accidental statebuilders driven to provide basic governance goods in order to create a stable commercial environment. These groups do not seek to rule; they provide governance because they need to trade—not as an end in itself. This leads to the book’s broader argument: it is trade, rather than war, that drives contemporary statebuilding. In areas where the state is weak and political authority is contested, where the rule of law is corrupt and government distrust runs deep, extralegal groups can provide order and dispute resolution, forming the basic kernel of the state. Extralegal groups also perform a series of hidden governance functions that establish public norms of compliance and cooperation with local populations. This sheds new light on how we understand violent nonstate actors, allowing us to view them as part of an evolutionary process of state-making, rather than simply as national security threats.

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Goldberg, Sanford C. Core Criteria I. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198793670.003.0004.

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Chapter 3 deals with the first issue one faces in the task of articulating the explicit epistemic criteria for belief: the problem of the criterion. It is tempting to suppose that a belief can be normatively proper from the epistemic point of view only if the believer can certify for herself the reliability of every belief-forming process on which she relied. But insisting on this quickly leads to the threat of an infinite regress. This chapter defends a foundationalist response to this problem, according to which we enjoy a default (albeit defeasible) permission to rely on certain cognitive processes in belief-formation. These are processes that satisfy what the author calls the Reliabilist Rationale. Importantly, our permissions here are social: any one of us is permitted to rely on any token process that satisfies this rationale, whether the token process resides in one’s own mind/brain or that of another epistemic subject.

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Bardon, Adrian. The Truth About Denial. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190062262.001.0001.

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It is a striking—yet all too familiar—fact about human beings that our belief-forming processes can be so distorted by fears, desires, and prejudices that an otherwise sensible person may sincerely uphold false claims about the world in the face of overwhelming evidence to the contrary. When we describe someone as being “in denial,” we mean that he or she is personally, emotionally threatened by some situation—and consequently has failed to assess the situation properly according to the evidence. People in denial engage in motivated reasoning about their situation: They (sincerely) argue and interpret evidence in light of a preestablished conclusion. One significant type of reason-distorting emotional threat is a threat to one’s ideological worldview. When group interests, creeds, or dogmas are threatened by unwelcome factual information, biased thinking becomes ideological denialism. (One critical example of such denialism is the widespread denial of settled climate science.) Denial can stand in the way of individual well-being, and ideological denialism can stand in the way of good public policy. This book is a wide-ranging examination of denial and denialism. It offers a readable overview of the social psychology of denial, and examines the role of ideological denialism in conflicts over public policy, politics, and culture. Chapters focus on our philosophical and scientific understanding of denial, denial of scientific consensus, denialism in political economy, and denialism in religious belief. An afterword examines proposals for improving science communication in light of findings about motivated reasoning and denial.

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Buchteile zum Thema "Forming threads"

Song, Jianli, Zhiqi Liu und Yongtang Li. „Process Parameters in the Cold Rolling Forming of Threads“. In Cold Rolling Precision Forming of Shaft Parts, 151–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54048-0_7.

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Song, Jianli, Zhiqi Liu und Yongtang Li. „Mechanism and Process Analysis on the Cold Rolling Forming of Threads“. In Cold Rolling Precision Forming of Shaft Parts, 137–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54048-0_6.

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Takemasu, Teruie, Toshinaka Shinbutsu, Shuichi Amano und Jyo Shimura. „Development of Anti-Loosening Bolts Based on Innovative Double Thread Mechanism“. In Forming the Future, 2155–65. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75381-8_181.

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Song, Jianli, Zhiqi Liu und Yongtang Li. „Numerical Simulation of the Thread Cold Rolling Forming Process“. In Cold Rolling Precision Forming of Shaft Parts, 187–208. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54048-0_8.

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Song, Jianli, Zhiqi Liu und Yongtang Li. „Metal Flow and Parameter Optimization of Thread Cold Rolling Forming Process“. In Cold Rolling Precision Forming of Shaft Parts, 209–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54048-0_9.

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Hesse, Michael, Stefan Vogel und Heidemarie Halbritter. „Thread-forming structures in angiosperm anthers: their diverse role in pollination ecology“. In Pollen and Pollination, 281–92. Vienna: Springer Vienna, 2000. http://dx.doi.org/10.1007/978-3-7091-6306-1_15.

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Kamei, N., Y. Kawamura, T. Nagamachi und H. Watari. „Development of New Press-Forming Process for a Screw-Threaded Fuel Filler Pipe“. In Proceedings of the 36th International MATADOR Conference, 79–82. London: Springer London, 2010. http://dx.doi.org/10.1007/978-1-84996-432-6_18.

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Wu, Chen-Fa, Chen Yang Lee, Chen-Chuan Huang, Hao-Yun Chuang, Chih-Cheng Weng, Ming Cheng Chen, Choa-Hung Chang, Szu-Hung Chen, Yi-Ting Zhang und Kuan Chuan Lu. „Sustainable Rural Development and Water Resources Management on a Hilly Landscape: A Case Study of Gonglaoping Community, Taichung, ROC (Chinese Taipei)“. In Fostering Transformative Change for Sustainability in the Context of Socio-Ecological Production Landscapes and Seascapes (SEPLS), 115–31. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6761-6_7.

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AbstractThe Gonglaoping community is located in Central Western Taiwan, with approximately 700 residents. The hilly landscape contains farmlands and sloping areas with abundant natural resources. Locals rely on the Han River system and seasonal rainfall for water supply for domestic use and irrigation. Uneven rainfall patterns and high demand for water has led to the overuse of groundwater and conflicts among the people. The surrounding natural forests provide important ecosystem services, including wildlife habitats and water conservation, among others; however, overlap with human activities has brought threats to biodiversity conservation. Considering these challenges, locals were determined to transform their community towards sustainability. The Gonglaoping Industrial Development Association (GIDA) and the Soil and Water Conservation Bureau (SWCB) joined hands to initiate the promotion of the Satoyama Initiative, playing catalytic roles in several implementations, such as establishing water management strategies based on mutual trust, rebuilding the masonry landscape, and economic development, forming partnerships with other stakeholders. This multi-stakeholder and co-management platform allowed the community to achieve transformative change, particularly in resolving conflicts of water use, restoring the SEPL, enhancing biodiversity conservation, and developing a self-sustaining economy.Achieving sustainability in a SEPL requires the application of a holistic approach and a multi-sector collaborating (community-government-university) platform. This case demonstrates a practical, effective framework for government authorities, policymakers and other stakeholders in terms of maintaining the integrity of ecosystems. With the final outcome of promoting a vision of co-prosperity, it is a solid example showing a win-win strategy for both the human population and the farmland ecosystem in a hilly landscape.

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„Thread Rolling“. In Metalworking: Bulk Forming, 489–504. ASM International, 2005. http://dx.doi.org/10.31399/asm.hb.v14a.a0004012.

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Adams Stein, Jesse. „(Re)making spaces and ‘working out ways’: women in the printing industry“. In Hot Metal. Manchester University Press, 2016. http://dx.doi.org/10.7228/manchester/9781784994341.003.0006.

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This chapter is about the experiences had by women in the printing industry in the second half of the twentieth century. Focusing on the stories of three women – a tablehand, a senior manager and a printing apprentice – the chapter explores how women in the printing industry coped with the shifting challenges of a patriarchal printing environment. One of the threads holding these three stories together is the presence of design and embodied experience; each of these narratives speaks of something made, designed or physically manipulated, be it spatial, environmental or technological. The active making and re-making of things and spaces, and the forming of embodied knowledge about machinery and industrial objects, were strategies that female workers mobilised in order to survive challenging and often discriminatory circumstances. The contentious politics lifting – and associated legal limitations – is evaluated, revealing a disjuncture between workplace rhetoric and actual embodied practice.

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Konferenzberichte zum Thema "Forming threads"

Towse, Adam. „Mode I Stress Intensity Factors for Small Defects in a Large Diameter Threaded Fixing“. In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21014.

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Abstract Mode I Stress Intensity Factors (SIFs) are presented at the surface and depth positions for shallow defects at the root of the male threads of an M130x4 – 6g / 6H threaded connection. The defects range between 1mm and 5mm in depth, and with an aspect ratio (a/b) between 1 (circular) and 0.1 (elongated). For the lowest a/b ratios, the defects approach the shape of an elongated constant depth defect running circumferentially. Such defects may be produced by preferential fatigue crack growth in the circumferential direction, fatigue crack initiation at the root or as a result of thread forming processes. The Mode I opening SIFs have been calculated using linear elastic Finite Element Analysis using contour integration. The modelling methodology was verified by comparison with published SIF solutions for semi-elliptical surface-breaking defects in a plate and also an unthreaded bar. SIFs have been calculated for both membrane and bending loading. The defects were placed at the position of greatest bending stress with the defects symmetric about the bending plane. SIFs have been calculated for different boundary conditions on the female thread side which affect the flow of load out of the stud, and hence the distribution of force in the stud and the resulting SIFs. The results show that if the flow of load in the stud is reversed, simulating reaction through a nut, then the calculated SIFs are higher than the case where the load is not reversed.

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Jie, Yang, Li Haitao, Rui Chengjie, Wei Wenjun und Dong Xuezhu. „Research on a Generating Method of Spiral Flutes of Hourglass Worm Gear Hob“. In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67053.

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All of the cutting edges on an hourglass worm gear hob have different shapes and spiral angles. If the spiral angles are small, straight flutes are usually adopted. But for the hob with multiple threads, the absolute values of the negative rake angles at one side of the cutting teeth will greatly affect the cutting performance of the hob if straight flutes are still used. Therefore, spiral flutes are usually adopted to solve the problem. However, no method of determination of the spiral flute of the hourglass worm gear hob has been put forward till now. Based on the curved surface generating theory and the hourglass worm forming principle, a generating method for the spiral flute of the planar double enveloping worm gear hob is put forward in this paper. A mathematical model is built to generate the spiral flute. The rake angles of all cutting teeth of the hob are calculated. The laws of the rake angles of the cutting teeth of four hobs with different threads from one to four threads are analyzed when straight flutes and spiral flutes are adopted respectively. The laws between the value of the negative rake angles of the hob with four threads and the milling transmission ratio are studied. The most appropriate milling transmission ratio for generating the spiral flute is obtained. The machining of the spiral flutes is simulated by a virtual manufacturing system and the results verify the correctness of the method.

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Ruszkiewicz, Brandt J., Gene Simpson und Eric Breidenbaugh. „Comparison of Commercially Available Thread Forming Profiles on Flow Drill Joining of 6061-T6 Aluminum to Thermoset Carbon Fiber Reinforced Composite“. In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2927.

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Abstract Flow Drill Screws are self-piercing, self-tapping screws used for single sided joining of light metals, such as aluminum. This technology has been adopted by many automotive OEMs for use in metals. Thread forming profiles exist for material stackups that are made of entirely metals and entirely polymers/composites. This research evaluated the effectiveness of these thread profiles in dissimilar metal-on-composite stackups. Thread profiles designed for use in polymers/composites and aluminum were compared with a traditional machine screw thread profile for flow drill joining of 1mm and 2mm thick 6061-T6 aluminum to 3mm thick thermoset carbon fiber reinforced polymer. The three thread profiles were manufactured as M5x25mm flow drill screws in their commercially available configurations and materials. Two parameter sets from the FDS equipment manufacturer were evaluated, the first designed for use with the polymer thread forming profile, the second designed for use with the aluminum thread forming profile. The thread profiles were evaluated based on outputs of process time, peak torque, and lap shear strength. The polymer thread profile had shorter process times than the other 2 profiles but caused more damage to itself and its mating material. All 3 thread profiles exhibited greater shear strength when aluminum was used as the lower sheet material.

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Goss, David C. „Thread Forming Fasteners for Tapping and Fastening into Magnesium Alloys“. In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1999. http://dx.doi.org/10.4271/1999-01-0923.

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Blaha, Johann, Franz Langmayr, Soeren Schackert, Cherng-Chi Chang, Diwakar Krishnaiah und Paul N. Crepeau. „Fatigue Strength Effect of Thread Forming Process in Cast Aluminum“. In SAE 2006 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2006. http://dx.doi.org/10.4271/2006-01-0780.

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Yan, Huajun, Shuangjie Zhang und Shibo Ma. „Research on defects and control method based on thread shaft forming“. In 2015 2nd International Conference on Machinery, Materials Engineering, Chemical Engineering and Biotechnology. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/mmeceb-15.2016.115.

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Tierling, Kenneth Shane. „Cash is King - Repurposing Marginal Assets to Reduce Floating LNG CAPEX“. In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/31053-ms.

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Objective / Scope With renewable energy sources not currently able to move energy around the globe and forming small portions of the total global energy supply, it has fallen upon hydrocarbon sources to form the backbone of global energy movements. Hence, the recent energy demand decline, along with policy, have disproportionately impacted world-wide petroleum and LNG pricing. The impact on Floating LNG has been a heightened demand for capital efficiency, required to achieve final investment decision. A business case specific means of reducing FLNG CAPEX, has been repurposing marginal assets. Starting with a breakdown of the cost components of an FLNG facility, this paper will provide examples of the inclusion of preexisting assets into FLNG projects to reduce capital cost. The paper will wrap up with other opportunities for cost savings, to stimulate thought. Methods, Procedures, Process Floating LNG (FLNG) technologies have been deployed to monetize mid-sized offshore gas reservoirs, avoiding constructing a sub-sea gas pipeline to a land-based LNG facility and export jetty. Containing the processing to an oceanic environment also reduces the impact on indigenous peoples as well as terrestrial flora and fauna. FLNG facilities also have the potential of serving multiple offshore fields over the life of the facility, thereby reducing the minimum size field that can be economically monetized. Interest in FLNG continues, despite the current slump in energy prices, however these challenging times are refocusing efforts on reducing the capital cost of FLNG. This paper will explore recent capital cost trends in LNG, with a focus on floating LNG, examples of realized opportunities to reduce CAPEX, and further scope for reductions. Results, Observations, Conclusions The readers will take-away from this paper a deeper understanding of: Recent trends in CAPEX for LNG, and specifically FLNG Where significant opportunities lie for cost reduction Examples of the reuse and repurposing of marginal assets to reduce cost of FLNG facilities Areas to be explored for future capital reduction Novel / Additive Information This paper pulls together disparate threads into a coherent whole, providing visualization of the trends and examples of realized opportunities.

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WIRTZ, SEBASTIAN FELIX, ANNA LENA DEMMERLING und DIRK SÖFFKER. „In-situ Wear Monitoring: An Experimental Investigation of Acoustic Emission During Thread Forming“. In Structural Health Monitoring 2017. Lancaster, PA: DEStech Publications, Inc., 2017. http://dx.doi.org/10.12783/shm2017/13987.

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Wang Yulin, Tao Lijia, Guo Qin und Feng Hutian. „Study on the forming process of thread raceway surface under the hard whirling“. In 2013 8th International Conference on Computer Science & Education (ICCSE). IEEE, 2013. http://dx.doi.org/10.1109/iccse.2013.6553985.

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Ellis, Fred V. „Fatigue and Corrosion Fatigue Failures“. In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71051.

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A metallurgical failure analysis was performed for a hanger rod and a waterwall tube sample. The hanger is a rigid type and supports a long vertical run of piping. The fracture is in one of the threaded ends and the fracture surface consists of three regions. The outermost portion adjacent to the thread root has ratchet marks that are an indication of fatigue crack initiation. The center portion has concentric, oval shaped beachmarks. The oval shape is consistent with an applied loading due to two bending moments. The inner portion is the final fracture and is approximately 1/4 of the thread root area indicating relatively low remote stresses. The failure mechanism is fatigue based on the beachmarks on the fracture surface and the transgranular cracking. The lower slope waterwall tube failure had a window opening fracture appearance. The axial fractures forming the window are located at the edge of the membrane welds on the cold or backside. There are shallow toe cracks at the membrane weld on the tube outside surface. The fracture surface had multiple, thumbnail-shaped fatigue cracks connected to the inside surface. These fatigue cracks are due to the corrosion fatigue mechanism based on two factors: (1) the stress responsible for their growth is related to the unit thermal cycling and the welded panel geometry near the corner of the boiler, and (2) they are oxidized indicating a corrosion contribution.

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Berichte der Organisationen zum Thema "Forming threads"

Cleaver, Ryan J., Todd H. Cleaver und Richard Talbott. MACHINING ELIMINATION THROUGH APPLICATION OF THREAD FORMING FASTENERS IN NET SHAPED CAST HOLES. Office of Scientific and Technical Information (OSTI), Mai 2012. http://dx.doi.org/10.2172/1039333.

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