Relevant bibliographies by topics / Screws assembly

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Screws assembly'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Screws assembly"

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Suknikhom, Kampol, Pattaramon Jongpradist, Surachate Chutima, and Thoatsanope Kamnerdtong. "Effects of Screw Fastening Sequence to Top Cover Loosening in Hard Disk Drive Assembly." Applied Mechanics and Materials 110-116 (October 2011): 3534–40. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.3534.

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In hard disk drive assembly process, a number of small screws around the perimeter of the top cover are used to attach the top cover to the base. When one of the screws is fastened, screw loosening at the other screw heads can frequently be observed. . This research employs a three-dimensional finite element analysis to compare the effects of three different screw tightening sequences to top cover loosening in a 3.5-inch hard disk drive assembly. The top cover deformation and the contact forces at the screw heads of the three sequences are presented and discussed. Among the three sequences, the across pattern has shown to be the most appropriate sequence in which a minimum screw loosening occurs.
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Hermansson, Thomas O. "Quality assured tightening of screw joints." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 15 (August 9, 2016): 2588–94. http://dx.doi.org/10.1177/0954406215602038.

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Assembly of critical threaded connections such as safety belt and steering wheel screw joints must be quality assured to 100%. Not only the screw needs to be in position but the strength of the joint must also be guaranteed. To accomplish this, classical process surveillance is combined with angle monitoring and screws with special features. A plant system that keeps track on cars of various variants sends information to a screw joint controller that in turn sends a unique parameter set to the screw joint equipment. Together with so-called socket trays and balancing rules, the process arrangement can be made in such a way that the wrong screw can never be assembled without detection. To provide sufficient strength of joints, different kinds of angle monitoring are used. For example, entering/down running angle monitoring that are used to secure sufficient thread engagement with static high strength joints. Angle monitoring is also used to control that all parts are in position before the joint is tightened. For clamp load critical joints, final angle monitoring is used. Together with standard torques and standard assembly friction given by standard fasteners, sufficient clamping force can be guaranteed. With clamp load critical chassis joints, gradient-controlled yield point tightening has shown to be a successful assembly technique with the all new Volvo XC90. Furthermore, screws with special thread geometries are used to avoid cross threading, and in many cases hand entering can be taken away. Altogether, it can be concluded that the Volvo Cars assembly technology not only is very safe but also at a relatively low cost.
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Novotný, Lubomír W., Jiří Marek, and Tomáš Marek. "Issue of Rigidity of the Ball Screw Nut Exposed to Bending Stress during Bending Stress of the Ball Screw." Applied Mechanics and Materials 821 (January 2016): 372–77. http://dx.doi.org/10.4028/www.scientific.net/amm.821.372.

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Ball screws and nuts represent the inseparable part of machinetool building. The thread lead accuracy ranges in hundredths of millimetres per 1 m. In addition to the undesirable phenomena caused by heat (dilatability) and, e. g., torsional and transverse oscillations, the bending stress of the ball screw is considerably undesirable too. This stress and at the same time behaviour are transferred to the bending stress of the ball screw nut. This has a very harmful influence on setting of the ball screws, when the machine tool is assembled. Using the analysis by means of the FEM method, the paper conducts a survey of deformation issue of the arrangement "machine – ball screw – ball screw nut" during the assembly stage as well as a survey of compensation possibilities and other technical measures determined to limit the undesirable deformations and stress of the ball screw originating already in the manufacturing stage of the machine tool.
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Chien, Tsai-Po, Te-Hsin Yang, and Feng-Cheng Chang. "Flexural Performance of Built-Up Beams Made with Plantation Wood." Forests 10, no. 8 (August 1, 2019): 647. http://dx.doi.org/10.3390/f10080647.

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In this study, Japanese cedar (Cryptomeria japonica (L. f.) D. Don) harvested from a plantation in Taiwan was used to develop built-up beams using self-tapping screws as metal connectors and resorcinol formaldehyde resin as glue to assemble components based on various assembly configurations. Results showed that adding glue provided flexural rigidity, whereas assembly using self-tapping screws resulted in built-up beams with high ductility but relatively low flexural bearing capacity. Beams used glue exhibited approximately linear behavior, whereas those using only screws exhibited some undulating and stepwise responses, implying that shear force between the flanges and the web may cause buckling as well as the dislocation of the self-tapping screws. When using components of similar grades, adding another web can improve the performance. Furthermore, the grades of flanges can strongly influence the flexural load-bearing capacity. In addition, a smaller spacing between the screws can improve the flexural load-bearing performance, but also cause wooden components to crack. Typical bending failure modes were observed in the developed built-up beams, indicating tension failure of the bottom flange as well as slippage between flanges and the web due to horizontal shear, which also caused buckling deformations in the screws.
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Fabre, Agnès, Ivan Lillamand, Jean-Éric Masse, and Laurent Barrallier. "Neutron Evaluation of Stress in Industrial Screws." Materials Science Forum 490-491 (July 2005): 269–74. http://dx.doi.org/10.4028/www.scientific.net/msf.490-491.269.

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Neutron diffraction measurements were used in this study in order to determine the axial stress state in loaded screw from a specific assembly. The knowing of stress gradient is need to qualify a standard gauge used to calibrate the response of in-situ measurements using ultrasonic nondestructive technique. US is well adapted to perform measurements of the evolution of stress state on industrial screws during service life of the bolded assemblies.
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Xu, Fei, I. John Khan, Kenneth McGuinness, Avanish S. Parmar, Teresita Silva, N. Sanjeeva Murthy, and Vikas Nanda. "Self-Assembly of Left- and Right-Handed Molecular Screws." Journal of the American Chemical Society 135, no. 50 (December 3, 2013): 18762–65. http://dx.doi.org/10.1021/ja4106545.

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VCELAK, JOSEF, PETR TICHÝ, TOMÁŠ BOUDA, JIŘÍ CHOMIAK, and LADISLAV TÓTH. "PEDICLE SCREW CONVERGENCE IMPACT ON THE STABILITY OF TRANSPEDICULAR FIXATION SPINE MODEL IN CYCLIC LOADING: BIOMECHANICAL STUDY." Journal of Mechanics in Medicine and Biology 15, no. 05 (October 2015): 1550078. http://dx.doi.org/10.1142/s0219519415500785.

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The principle of this study is experimental measurement and description of behavior of transpedicular fixation during cyclic loading due to convergence of screw insertion. Investigations were made of three configurations of assemblies of posterior stabliization with converging screws at 0°, 20° and 40°. The experiment was inspired ASTM Standard F1717 and modified to minimize the effect of other parameters. The MTS 858.2 Mini Bionix testing system was used during the experiment, in conjunction with the Interface 1010ACK load cell. Data processing and analysis were carried out by Matlab R 20102b, MathWorks. The probed assemblies were cyclically loaded until structural failure occurred, always at the screwbone (or PUR block) interface, i.e., the "windshield wiper" effect. The measurement results show that while the rigidity of the assembly increases with increased convergence of transpedicular screws, they also indicate an increased initial rate of assembly damage accumulation, together with assembly failure during a reduced number of cyclic loading cycles. The mechanical behavioral study of transpedicular fixation is limited by the conditions of simplification of interpretation of complex movements and spinal pathophysiology in the attempt to minimize the effect of other parameters and exaggerated measurements.
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VIEIRA, FABIO ANTONIO, ANDRÉ SOUSA GARCIA, FERNANDO TADASHI SALVIONI UETA, DAVID DEL CURTO, RENATO HIROSHI SALVIONI UETA, and EDUARDO BARROS PUERTAS. "CORRELATION BETWEEN THE SCHANZ SCREW INSERTION ANGLE AND THE LOSS OF KYPHOSIS CORRECTION IN THORACOLUMBAR FRACTURES." Coluna/Columna 19, no. 3 (July 2020): 209–12. http://dx.doi.org/10.1590/s1808-185120201903179394.

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ABSTRACT Objective To compare the Schanz screw insertion angle and the loss of the regional kyphosis correction in thoracolumbar burst fractures following posterior short instrumentation surgery. Methods Patients with a thoracolumbar burst fracture between levels T11-L2 were divided into two groups (parallel and divergent) according to the angle formed between the Schanz screw and the vertebral plateau. Regional kyphosis was evaluated in preoperative, immediate postoperative and last follow-up radiographs. Results Of the 58 patients evaluated, 31 had a parallel assembly and 27 had a divergent assembly. When we analyzed the angle of kyphosis, no statistical difference was observed between the pre- and postoperative radiographs. However, a statistical difference in the last follow-up radiographs and in the final loss of the kyphosis correction was confirmed. Conclusion The insertion of Schanz screws with a divergent assembly presents better radiographic results with less loss of kyphosis correction angle when compared with the parallel assembly technique. Level of Evidence III; Retrospective cohort study.
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Zapłata, J. "Measurements of Temperature of CNC Machine Tool Ball Screw Utilising IR Method." International Journal of Applied Mechanics and Engineering 22, no. 3 (August 1, 2017): 769–77. http://dx.doi.org/10.1515/ijame-2017-0049.

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AbstractIn numerous papers it is proposed to use IR measurements of feed axis ball screw temperature distribution in order to compensate CNC machine tool thermal errors. The paper aims to validate reliability of the IR measurements in application to the feed axes ball screws. The identification of key factors influencing the accuracy of the IR measurements of ball screw temperature distribution has been conducted. A test-bench utilizing a ball screw assembly with built-in temperature sensors was introduced and the experimental data are presented along with conclusions.
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Lin, S. R., J. S. Yu, and C. S. Chang. "Stress analysis of screws in the fuel channel fastener assembly." International Journal of Pressure Vessels and Piping 117-118 (May 2014): 49–55. http://dx.doi.org/10.1016/j.ijpvp.2013.10.009.

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Dissertations / Theses on the topic "Screws assembly"

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Kočiš, Petr. "Orientační ústrojí průmyslových robotů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231675.

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The diploma thesis deals with an orientation mechanism of industrial robots for mounting of pivots and screws into the mounting holes. In the first phase there is a research of inventions mainly realized in the United States Patent and Trademark Office database. Subsequently the conditions of the assembly are solved. On the base of the conditions the functional requirements are described. The diploma thesis includes seven conceptual variants, which are proposed as a 3D design. Using the basical multi-criteria method the best conceptual variant is specified. That is specified due to the accepted criterias. In the next part of the diploma thesis there is a calculation, that comprises this technically and economically most promising conceptual variant. The calculation consists of a statics, a kinematics and a dynamics of the propel, a stenght control of the mechanism and kinematics analysis of the whole mechanism. Results of the calculation are used by the detailed design of orientation mechanism, that also comprises technological production theory and a correct assembly. Economical analysis, which comprises cost of produce of this newly developed automation equipment, is worked up in the conclusion of the diploma thesis. The diploma thesis also comprises drawings. The variant solves a new conception, which can be patented as an utility model.
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Rusli, Leonard Priyatna. "Design and analysis of mechanical assembly via kinematic screw theory." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1218042368.

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Wiedmann, Stephen Louis. "Kinematic Analysis of a Threaded Fastener Assembly." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/31685.

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The demands for an increase in productivity and reduced assembly costs require engineers to automate solutions that replace manual labor. This work concentrated on a common assembly primitive, threaded fastener insertion, in an effort to determine the nature of contact between a bolt and nut during thread mating. The assembly problem was initially simplified as a two-dimensional analysis to gain an understanding about how contacts between the bolt and nut change during counter-clockwise motion. Tessellated solid models were used during three-dimensional collision analysis in such a way that the approximate location of the contact point was enumerated. The advent of a second contact point presented a more constrained contact state since we are interested in maintaining both contacts; thus the bolt rotated about a vector defined by the initial two contact points until a third contact location was found. By analyzing the depth of intersection of the bolt into the nut as well as the vertical movement of the origin of the bolt reference frame, we determined that there are three types of contacts states present: unstable two-point, quasi-stable two-point, stable three point. Though the unstable case remains to be deciphered, the parametric equations derived in this work can be used without modification to create a full spectrum of maps at any point in the history of a threaded assembly problem. We investigated 81 potential orientations, each of which has its own set of contact points. From this exhaustive examination, we are capable of detailing a contact state history and, from this, have the potential to develop a constraint network.
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Foster, Christopher William. "The assembly and modification of screen-printed platforms for electroanalytical applications." Thesis, Manchester Metropolitan University, 2015. http://e-space.mmu.ac.uk/701/.

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This thesis reports upon the novel assembly and modification of screen-printed electrode systems. These key electrochemical proof-of-concepts have been benchmarked utilising voltammetric techniques, supporting the design of next-generation electrochemical sensing platforms, this thesis allows for proven laboratory-based approaches to be potentially up-scaled and commercially applied. Chapter 3 introduces the potential influence mechanical contortion upon the electrochemical performance of graphite based electroanalytical screen-printed platforms upon graphic paper, tracing paper and an ultraflexible polyester-based substrate are used. These sensors are electrochemically benchmarked against well-known redox probes hexxammineruthenium (III) chloride, potassium ferrocyanide and nicotinamide adenine dinucleotide (NADH). It was found that these ultraflexible based polyester-based electrodes are superior since they can withstand extensive mechanical contortion, yet still give rise to useful electrochemical performances. Most importantly the ultraflexible polyester electrodes do not suffer from capillary action as observed in the case of paper-based sensors causing the solution to wick-up the electrode towards the electrical connections. A new configuration is also explored using these electrode substrate supports where the working carbon electrode contains the electrocatalyst, cobalt (II) phthalocyanine (CoPC), and is benchmarked towards the electroanalytical sensing of the model analytes citric acid and hydrazine. Chapter 4 for the first time critically compares CoPC modified electrodes prepared by drop-casting CoPC nanoparticles (nano-CoPC) onto a range of carbon based electrode substrates with that of CoPC bulk modified screen-printed electrodes, towards the sensing of the model analytes L-ascorbic acid, oxygen and hydrazine. It is found that no "electrocatalysis" is observed towards L-ascorbic acid using either of these CoPC modified electrode configurations and that the bare underlying carbon electrode is the origin of the obtained voltammetric signal, which gives rise to useful electroanalytical signatures, providing new insights into literature reports where "electrocatalysis" has been reported with no clear control experiments undertaken. Chapter 5 presents a concise study upon the effect of in-situ bismuth, antimony, tin modified electrodes and combinations thereof towards the electrochemical detection of model analytes cadmium (II) and lead (II). It is found that the electrochemical response using the available range of metallic modifications is only ever observed when the underlying electrode substrate exhibits relatively slow electron transfer properties; in the case of fast electron transfer properties, no significant advantages are evident. It is demonstrated that a simple change of pH can allow the detection of the target analytes (cadmium (II) and lead (II)) at levels below that set by the World Health Organisation (WHO) using bare graphite screen-printed electrodes. Chapter 6 introduces the electroanalytical sensing of lead (II) ions utilising square-wave anodic stripping voltammetry where an increase in the electroanalytical sensitivity is observed by a factor of 5 with the screen-printed back-to-back microband configuration. Upon application of this configuration towards the quantification of lead (II) ions, within drinking water corresponds to a concentration of 2.8 (±0.3) μg/L. Independent validation was performed using ICP-OES with the levels of lead (II) ions found to correspond to 2.5 (±0.1) μg/L; the excellent agreement between the two methods validates the electroanalytical procedure for the quantification of lead (II) ions in drinking water. Finally, Chapter 7 examines for the first time, characterisation of the number of drawn pencil layers and the grade of pencil; these parameters are commonly overlooked when utilising PDEs. It is demonstrated that a PDE drawn ten times with a 6B pencil presented the most advantageous electrochemical platform, in terms of electrochemical reversibility and peak height/analytical signal. These PDEs have demonstrated beneficial electroanalytical capabilities towards p-benzoquinone and the simultaneous detection of heavy metals, namely, lead (II) and cadmium (II) all of which are explored for the first time utilising PDEs. Initially, the detection limits of this system were lower than desired for an electroanalytical platforms, however implementation of PDEs in a back-to-back configuration (as shown within Chapter 6), the detection limits for lead (II) and cadmium (II) correspond to 10 μgL-1 and 98 μgL-1 respectively within model aqueous (0.1 M HCl) solutions.
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Hermle, Johannes [Verfasser], and Hans-Georg [Akademischer Betreuer] Kräusslich. "siRNA SCREEN FOR IDENTIFICATION OF HUMAN KINASES INVOLVED IN ASSEMBLY AND RELEASE OF HIV-1 / Johannes Hermle ; Betreuer: Hans-Georg Kräusslich." Heidelberg : Universitätsbibliothek Heidelberg, 2017. http://d-nb.info/1180987047/34.

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Kenklies, Kai Malte. "Instructing workers through a head-worn Augmented Reality display and through a stationary screen on manual industrial assembly tasks : A comparison study." Thesis, Umeå universitet, Institutionen för informatik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172888.

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It was analyzed if instructions on a head-worn Augmented Reality display (AR-HWD) are better for manual industrial assembly tasks than instructions on a stationary screen. A prototype was built which consisted of virtual instruction screens for two example assembly tasks. In a comparison study participants performed the tasks with instructions through an AR-HWD and alternatively through a stationary screen. Questionnaires, interviews and observation notes were used to evaluate the task performances and the user experience. The study revealed that the users were excited and enjoyed trying the technology. The perceived usefulness at the current state was diverse, but the users saw a huge potential in AR-HWDs for the future. The task accuracy with instructions on the AR-HWD was equally good as with instructions on the screen. AR-HWDs are found to be a better approach than a stationary screen, but technological limitations need to be overcome and workers need to train using the new technology to make its application efficient.
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Kulčar, Vojtěch. "Konstrukce stanice pro montáž závitových vložek do automobilových klik." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231491.

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The subject of this thesis is design of stand for assembly of srew-inserts into car door handles. It contains of search of possible technical solutions of part handling and available technologies of screw-insert instalation. In design part of thesis contains of analysis of construction and choice of technologies. In construction part of my thesis u can find description construction of stand and risk analysis of this machine. Moreover there are calculations, drawings of main assemblies of machine and model of stand modeled in Autodesk Inventor.
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Fleming, Ian Murray Cameron. "Studies on RNA Modification and Editing in Trypanosoma brucei." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1452245560.

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Decorde, Nicolas. "Développement de jauges de contrainte à base de nanoparticules colloïdales : Application à la réalisation de surfaces tactiles souples." Thesis, Toulouse, INSA, 2014. http://www.theses.fr/2014ISAT0002/document.

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Un grand défi actuel consiste à réaliser des capteurs innovants tirant partie des propriétés singulières de nanoparticules colloïdales synthétisées par voie chimique et assemblées de manière contrôlée sur des surfaces. L’objet de cette thèse est le développement de jauges de contrainte résistives à base de nanoparticules. Ces jauges de contrainte sont constituées de lignes parallèles, de quelques micromètres de large, denses, de nanoparticules colloïdales d’or synthétisées par voie chimique et assemblées sur des substrats souples par assemblage convectif contrôlé. Le principe de ces capteurs résistifs repose sur la conduction tunnel entre les nanoparticules qui varie de manière exponentielle lorsque que l’assemblée est déformée. Des mesures électro-mécaniques couplées à des observations en microscopie électronique à balayage et à force atomique ont permis d’identifier, de quantifier et de comprendre l’impact de la taille et de la nature des ligands des nanoparticules sur la sensibilité et les phénomènes de dérive de la résistance à vide des jauges de contrainte. Ces travaux, associés à des mesures de diffusion de rayons X aux petits angles ont permis de corréler les variations macroscopiques de résistance électrique des jauges de contrainte aux déplacements relatifs des nanoparticules. Finalement, ces jauges de contrainte ultra-sensibles et miniatures, mises en matrices, ont été exploitées pour réaliser des surfaces tactiles souples multi-points et sensibles à l’intensité de l’appui
One recent big challenge is to implement innovative sensors that take advantage of the unique properties of colloidal nanoparticles chemically synthesized and assembled on various surfaces. The goal of this work is the development of nanoparticle based resistive strain gauges. These strain gauges are constructed of few micrometers wide parallel wires of close packed colloidal gold nanoparticles, chemically synthesized, and assembled on flexible substrates by convective self assembly. The principle of these resistive sensors is based on the tunnel conduction between the adjacent nanoparticles which varies exponentially as the assembly is stretched. Electro-mechanical measurements coupled with scanning electron microscopy and atomic force microscopy observations were used to identify, quantify and understand the impact of the nanoparticle size and the nature of the protecting ligands, on the gauge sensitivity and the drift of the resistance at rest of the nanoparticle based strain gauges. Coupled with small angle x-ray scattering measurements, these studies allowed us to correlate the macroscopic changes in electrical resistance of the strain gauges to the relative displacement of the nanoparticles at the nanoscale. Finally, a matrix of these miniature ultra-sensitive gauges was used to construct flexible touch screen panels capable of measuring the intensity of several touches simultaneously
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Li, Yanguang. "Nanostructured Materials for Energy Applications." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275610758.

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Books on the topic "Screws assembly"

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Virginia. Dept. of Social Services. Report of the Department of Social Services and Department of Education studying the feasibility of development of a behavioral profile to screen prospective workers in child-caring positions: To the Governor and the General Assembly of Virginia. Richmond: Commonwealth of Virginia, 1988.

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Publishing, Dial Screw Assembler. World's Most Amazing Dial Screw Assembler: Lined Journal, 120 Pages, 6 X 9, Dial Screw Assembler Funny Job Work Gift Idea, Black Matte Finish. Independently Published, 2020.

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Publishing, Screw Eye Assembler. World's Most Amazing Screw Eye Assembler: Lined Journal, 120 Pages, 6 X 9, Screw Eye Assembler Funny Job Work Gift Idea, Black Matte Finish. Independently Published, 2020.

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Book chapters on the topic "Screws assembly"

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Keeler, Robert. "Screen Printing." In The Electronics Assembly Handbook, 293–300. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-662-13161-9_50.

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McQuiston, Kate. "Some Assembly Required." In The Routledge Companion to Screen Music and Sound, 477–93. New York ; London : Routledge, 2017.: Routledge, 2017. http://dx.doi.org/10.4324/9781315681047-39.

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Juelg, Christian, Andreas Hermann, Arne Roennau, and Rüdiger Dillmann. "Efficient, Collaborative Screw Assembly in a Shared Workspace." In Intelligent Autonomous Systems 15, 837–48. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01370-7_65.

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Morris, John R., and Thaddeus Wojcik. "Screen and Stencil Printing Technology for Fine-Pitch Assembly." In Handbook of Fine Pitch Surface Mount Technology, 194–232. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4684-1437-0_6.

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Desrochers, Alain, and Olivier Delbart. "Determination of Part Position Uncertainty Within Mechanical Assembly Using Screw Parameters." In Geometric Design Tolerancing: Theories, Standards and Applications, 185–96. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5797-5_14.

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Koh, Seung Kee. "Stress Corrosion Cracking Life Estimation of Hold-Down Spring Screw for Nuclear Fuel Assembly." In Key Engineering Materials, 1834–39. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-978-4.1834.

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Moro, Tanguy. "Product/Process Tolerancing Modelling and Simulation of Flexible Assemblies - Application to a Screwed Assembly with Location Tolerances." In Lecture Notes in Mechanical Engineering, 150–58. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53669-5_12.

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"Effect of repeated tightening and loosening cycles of prosthetic screws in the micromovements of the abutment-implant assembly: A pilot study." In Biodental Engineering III, 43–48. CRC Press, 2014. http://dx.doi.org/10.1201/b17071-10.

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Brindley, Keith. "Nylon screen PCB manufacture." In Newnes Electronics Assembly Pocket Book, 144–45. Elsevier, 1991. http://dx.doi.org/10.1016/b978-0-7506-0222-8.50066-1.

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"9. ‘What does S.H.I.E.L.D. stand for?’: The MCU on the Small Screen in Marvel’s Agents of S.H.I.E.L.D. and Marvel’s Agent Carter." In Avengers Assemble!, 207–22. Columbia University Press, 2018. http://dx.doi.org/10.7312/mcsw18624-012.

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Conference papers on the topic "Screws assembly"

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Wiedmann, Stephen L., and Robert H. Sturges. "Passive Assembly of Screws: Part 1 — Modeling Screw Threads for Contact Analysis." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/dfm-8975.

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Abstract Successful assembly of threaded fasteners by compliant devices, like the SRCC, requires a thorough understanding of all possible contact configurations. In this study, the threaded pair is modeled numerically and contact tests are automated through software manipulation. It is shown that contact types and locations lack symmetry with respect to symmetrical test orientations of the screw.
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Zussman, Eyal, Moshe Shoham, and Ehud Lenz. "Kinematic Evaluation of Robots for Assembly Tasks." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0180.

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Abstract An automatic assembly planning program should be able to analyze the assembly kinematic constraints, generate possible motions and select the appropriate assembly machines. This paper develops an approach for evaluating a robot for assembly tasks and planning its motions. The kinematical characteristics of both the robot and the assembly tasks are described by infinitesimal screws. The possible motions of the assembled parts are represented by convex cone of screws derived from the geometrical constraints. The robot’s possible motions are represented by the Jacobian cone, which is a modification of the Jacobian matrix that provides a common mathematical basis for convex cones operations. The selection procedure of the robot is based on the intersection of its cone with the assembly cones which results in feasible assembly directions for the robot. Choosing the optimal assembly direction and the robot posture is obtained by minimizing a cost function subjected to the constraints of both the robot and the assembly. Several given examples demonstrate the evaluation procedure and the planning approach.
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Romsland, Ruby, and Kenneth J. McDonald. "Corrosion Evaluation of a Navy MK50 Weapon Station Friction Brake Assembly." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24595.

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Abstract The presence of corrosion on or within structures is of major concern as corrosion reduces the integrity of the materials which could potentially result in large-scale failures of structures and equipment.1 The United States Navy is an organization that actively works to prevent large equipment failure due to corrosion. One such problem is the corrosion of the friction brake assembly on the MK50 Weapon Station, which has recently been experiencing corrosion between the friction brake and its set screw preventing it from operating correctly. The friction brake was known to be stainless steel; however, the set screw was of unknown composition. Through elemental analysis it was determined that the MK50 Weapons Station friction brake set screw was similar in composition to commonly available black oxide coated steel screws. Electrochemical polarization measurements of the friction brake assembly components revealed that the set screw and the friction brake were electrochemically dissimilar metals which resulted in the galvanic corrosion of the assembly when out at sea. The electrochemical polarization measurements of a stainless steel screw showed a corrosion potential similar to that of the friction brake; therefore, replacing the current set screw with a stainless steel screw would decrease the galvanic potential difference between the set screw and the friction brake. This proposed solution is expected to slow or prevent further corrosion of the MK50 Weapon Station ensuring the combat readiness of the equipment.
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Alkelani, Ali, and Basil Housari. "Development of Tightening Torque for Self Tapping and Thread Rolling Fasteners." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57132.

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Torque is the most common tightening strategy used to control clamp load when bolts are tightened, since a direct relationship between torque and clamp load exists. For unified and metric fasteners used in non-critical applications, there are torque tables available in the literature that provide a guideline as to what torque level is recommended to be used based on fastener size, thread pitch, and material class. For critical applications, the tightening specification is usually developed based on individual cases. For self tapping and thread rolling screws, the tabulated torque values available for machine threaded screws cannot be used. If the torque spec is not developed carefully for such joints then problems such as stripping the threads or torqueing out before seating the screw may be encountered. This is mainly due to the fact that these types of screws are very sensitive to many variables, such as thread type, hole size, coating, joint surface finish, tapped material thickness, and other factors. For such fasteners, the torque spec should be developed experimentally based on test data for the actual joint. This paper provides an accurate procedure for developing tightening specifications for joints that use self tapping and thread rolling screws. Additionally, it provides a criterion to determine whether the joint design is robust enough for assembly or not.
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Zha, J., Q. Jia, H. D. Cong, and Y. L. Chen. "Uneven Preload for Improving Motion Straightness in Closed Hydrostatic Guideways." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46577.

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Hydrostatic guideways have varied applications in precision or ultra-precision machine tools due to their high motion accuracy and low friction coefficient. Slider motion straightness is an important accuracy index for evaluating precision of hydrostatic guideways. It can be defined as the linear deviation of the slider center within the entire or any assigned stroke. This paper mainly focuses on the relationship between the keeper rail (upper guiderail) preload and slider motion straightness in the closed hydrostatic guideways, where the slider is enveloped by the guiderails. A finite element method was used to calculate keeper rail deformation under different screw preloads, slider motion straightness was measured by laser interferometer. Mapping relationship between screw preload and slider motion straightness was obtained. Experimental results shown that the end of the keeper rail had larger deformation for same preload conditions on all screws. This had an obvious effect on slider motion straightness. When oil supply pressure was 0.85 Mpa, slider motion straightness was 2.08 μm and 1.85 μm (within the entire stroke 330 mm) with torque on all screws as 15Nm and 20Nm, respectively. After uneven preload was employed, slider motion straightness was 0.87 μm and 0.84 μm for the above mentioned two cases. Accuracy increased by more than 50 percent. Screw preload approach proposed in this study can be used to guide the assembly processes of closed hydrostatic guideways with other forms for improving the motion straightness.
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Wu, Zhijun, Sayed A. Nassar, Kshitij Satav, and Shraddha Jagatap. "Self-Tapping Screw Performance in Aluminum-Steel Joints." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65786.

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Over the last few decades, lightweight material joints including plastics, aluminum, magnesium and various composites have been widely used in many mechanical and structural applications such as automotive, aircraft and so on, for their high strength-to-weight ratio and the significant improvement for the fuel economy and energy efficiency. Self-tapping screws are one of major technologies to connect the various joints and provide system integrity in ease of system assembly, low cost, etc. In this study, tightening performance of thread cutting screw in aluminum joints is evaluated. Effect of repeated tightening and loosening on the screw performance is investigated for the screw residual torque after environmental thermal cycling. Cyclic temperature fluctuates between 130°C and −20°C in a computer-controlled environmental chamber. Joint coupon materials are steel and aluminum material. Analysis of experimental data provides a useful insight into the self-tapping process into aluminum joints.
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Ghalambor, Saeed, John Edward Fernandes, Dereje Agonafer, and Veerendra Mulay. "Improving the Thermal Performance of a Forced Convection Air Cooled Solution: Part 1 — Modification of Heat Sink Assembly." In ASME 2013 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ipack2013-73108.

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Forced convection air cooling using heat sinks is one of the most prevalent methods in thermal management of microelectronic devices. Improving the performance of such a solution may involve minimizing the external thermal resistance (Rext) of the package. For a given heat sink design, this can be achieved by reducing the thermal interface material (TIM) thickness through promotion of a uniform interfacial pressure distribution between the device and heat sink. In this study, a dual-CPU rackmount server is considered and modifications to the heat sink assembly such as backplate thickness and bolting configuration are investigated to achieve the aforementioned improvements. A full-scale, simplified model of the motherboard is deployed in ANSYS Mechanical, with emphasis on non-linear contact analysis and torque analysis of spring screws, to determine the optimal design of the heat sink assembly. It is observed that improved interfacial contact and pressure distribution is achieved by increasing the number of screws (loading points) and positioning them as close to the contact area as possible. The numerical model is validated by comparison with experimental measurements within reasonable accuracy. Based on the results of numerical analysis, the heat sink assembly is modified and improvement over the base configuration is experimentally quantified through interfacial pressure measurement. The effect of improved interfacial contact on thermal performance of the solution is discussed.
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Isele, D., C. Friedrich, and A. Isele. "Analysis of Preload Loss With Corrosion Protection Layers in the Flow of Force." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66005.

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This contribution investigates the tightening behavior and preload loss of bolted joints with painted coating systems for corrosion protection of components. Friction coefficients are measured with test stand, preload loss is measured by strain gauges. Further evaluation is done with optical roughness measurement to see damage of the painted surfaces in contact areas. Resulting from this hints for applications get obvious. Research progress focuses the quantification of preload loss in different applications. Mechanical loads are neglected at that stage because of minor influence as the temperature. To sum up, it can be formulated that the tested, robust coating systems can endure yield-point-tightening of high-strength screws and also exist as a complete and coherent layer after the loosening. Therefore corrosion protection could be guaranteed also after a yield-point-tightening, especially underneath the screw head. This is in particular relevant for applications which require repeated tightening of the same screw. Corrosion protection layers within the flow of force usually change the friction coefficients compared with bare material. This effect influences the assembly of bolted connections dominantly. Controlling the assembly process is getting more difficult because of the increasing scattering from steering parameters, like torque or angle. There might be huge deviations, up to a factor of 6.2, between torque values of a similar assembly process. Therefore process safety cannot be guaranteed, especially if their values miss originally defined tolerances. To overcome these difficulties it is necessary to use the right assembly method as well as the right coating system. After our opinion the yield-point controlled tightening is the only method which leads to a safe assembly preload, even with coated parts. If the preload loss will be acceptable depends on the coating system and the external conditions.
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Tabesh, Majid, Mohammad Elahinia, and Mehdi Pourazady. "Modeling NiTi Superelastic-Shape Memory Antagonistic Beams: A Finite Element Analysis." In ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1365.

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Shape memory alloys (SMA) have received widespread attention from researchers in various fields of engineering sciences due to their exceptional properties of shape memory and superelasticity. NiTi equiatomic alloys among other SMA, show acceptable biocompatibility to be implemented in biomedical applications. Applications of NiTi in biomedical areas specifically orthopedics, demonstrate its unique performance which is not achievable with conventional materials. Pedicle screws, which are used as an anchoring point for implanting spinal instrumentations in spinal fracture and deformity treatments, entail a major drawback; i.e. loosening and back-out. The strength of screw contact with the surrounding bone diminishes as the bone degrades due to osteoporosis. A “Smart” pedicle screw design was developed to address this issue which uses NiTi superelastic-shape memory coils wrapped around it. The smart assembly consists of external superelastic tubing which is responsible for expanding the designed protrusions when they reach body temperature; also an internal shape memory wire inserted into the tubing is sought to retract the assembly when locally heated to above body temperature. The whole assembly was modeled as a beam structure in COMSOL Multiphysics Finite Element software. The behavior of shape memory alloy was defined in the software via its Partial Differential Equation (PDE) module. The SMA model has is a Tanaka-based model and is capable of capturing shape memory effect, superelasticity and hysteresis behavior, and partial transformation in both positive and negative directions. This 1D model was further modified to be included in a 3D framework such that it makes it possible for simulation of a beam under bending. The functionality of the smart screw design can be studied via this FEM model as a future work and the outcomes of the simulation can be compared with experimental tests on the prepared sample of the screw comprising NiTi tubing and wires.
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Jayaram, Uma, Hrishikesh Tirumali, Sankar Jayaram, and Kevin Lyons. "A Tool/Part/Human Interaction Model for Assembly in Virtual Environments." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/cie-14584.

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Abstract Current virtual assembly environments primarily allow assembly operations involving pick and place manipulations with hands. In some applications, assembly tools snap onto screws and are constrained. Some non-immersive systems create tool motion script models for the tool to execute the assembly operation. The inclusion of tools and realistic tool operations is a significant step in creating a better virtual assembly environment. We propose a technique to model hand held tools and the corresponding assembly operations in a virtual environment. Intermediate-location constraints and tool engagement constraints obtained from the CAD model are used to model the intermediate positions and engagements of a fastener tool, tool-part, and base-part. In addition, tool-based motion dependent on the rotation of the tool and the pitch of the thread has been achieved for a fastener part This allows us to simulate the physical reality of these interactions without using expensive collide, penetrate, correct, and align methods. The tools and tool/hand/part interactions have been modeled and tested in a virtual assembly and design environment successfully. This capability also allows tool accessibility and tool operability to be verified.
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