Relevant bibliographies by topics / Spindle Design

Contents

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

Academic literature on the topic 'Spindle Design'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 March 2023

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Journal articles on the topic "Spindle Design"

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Rudolf, Lukas, Jiri Fries, Oldrich Ucen, Tomas Kubin, and Lukas Kudrna. "Design of Grinding Machine Spindle." Multidisciplinary Aspects of Production Engineering 1, no. 1 (2018): 69–75. http://dx.doi.org/10.2478/mape-2018-0010.

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Abstract When grinding high demands are usually placed on the geometrical tolerances of the workpiece surface. For this reason, the spindles of the grinding machines are normally designed with requirements for a minimum position change of the grinding disks due to external forces and bending moments. The design theory of these spindles is relatively well elaborated, as it represents the most frequently used solution in practice. However, there are also cases where it is necessary to grind some hard-to-reach areas, using a great ejection of the spindle. In these cases, it is necessary to reassess the required geometrical tolerances with regard to its necessity to comply with the minimal changes in the position of the grinding discs due to the great ejection. Where it is necessary to maintain high geometrical tolerances, it is necessary to ensure a greater rigidity of the spindle. This rigidity is usually improved by increasing its diameter. By doing this we also increase the weight of the spindle that is heavily ejected, and thus its deformation can occur due to gravity forces. That is why it is necessary to analyse the deflection of the spindle depending on its ejection in the course of its design. In the case we increase the diameter of the grinder spindle the possible applicable grinding disc diameter decreases, due to the growing size of its housing. Any grinding of hard-to-reach surfaces is therefore done in particular to improve the quality of the surface with low requirements on the geometrical tolerances. This article deals with the design patterns for a spindle used in axial grinding for inner rotating surfaces. The article contains a spindle design solution and an analysis of its deflections, depending on its ejection, and the size of the passive forces.
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O'Toole, E. T., D. N. Mastronarde, T. H. Giddings, M. Winey, D. J. Burke, and J. R. McIntosh. "Three-dimensional analysis and ultrastructural design of mitotic spindles from the cdc20 mutant of Saccharomyces cerevisiae." Molecular Biology of the Cell 8, no. 1 (1997): 1–11. http://dx.doi.org/10.1091/mbc.8.1.1.

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The three-dimensional organization of mitotic microtubules in a mutant strain of Saccharomyces cerevisiae has been studied by computer-assisted serial reconstruction. At the nonpermissive temperature, cdc20 cells arrested with a spindle length of approximately 2.5 microns. These spindles contained a mean of 81 microtubules (range, 56-100) compared with 23 in wild-type spindles of comparable length. This increase in spindle microtubule number resulted in a total polymer length up to four times that of wild-type spindles. The spindle pole bodies in the cdc20 cells were approximately 2.3 times the size of wild-type, thereby accommodating the abnormally large number of spindle microtubules. The cdc20 spindles contained a large number of interpolar microtubules organized in a "core bundle." A neighbor density analysis of this bundle at the spindle midzone showed a preferred spacing of approximately 35 nm center-to-center between microtubules of opposite polarity. Although this is evidence of specific interaction between antiparallel microtubules, mutant spindles were less ordered than the spindle of wild-type cells. The number of noncore microtubules was significantly higher than that reported for wild-type, and these microtubules did not display a characteristic metaphase configuration. cdc20 spindles showed significantly more cross-bridges between spindle microtubules than were seen in the wild type. The cross-bridge density was highest between antiparallel microtubules. These data suggest that spindle microtubules are stabilized in cdc20 cells and that the CDC20 gene product may be involved in cell cycle processes that promote spindle microtubule disassembly.
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Orłowski, Kazimierz A., and Przemysław Dudek. "Analysis of the design development of the sliding table saw spindles." Mechanik 90, no. 10 (2017): 849–51. http://dx.doi.org/10.17814/mechanik.2017.10.125.

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Producers of sliding table saws constantly strive for improvement in sawing accuracy. One of the method is an upswing in a spindle behavior, since, it affects to a large degree sawing effects. The design development of sliding table saw spindles during the last quarter-century is presented. The spindle system of the modernized spindle of the sawing machine Fx550 is described.
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Gao, Qiang, Siyu Gao, Lihua Lu, Min Zhu, and Feihu Zhang. "A Two-Round Optimization Design Method for Aerostatic Spindles Considering the Fluid–Structure Interaction Effect." Applied Sciences 11, no. 7 (2021): 3017. http://dx.doi.org/10.3390/app11073017.

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The fluid–structure interaction (FSI) effect has a significant impact on the static and dynamic performance of aerostatic spindles, which should be fully considered when developing a new product. To enhance the overall performance of aerostatic spindles, a two-round optimization design method for aerostatic spindles considering the FSI effect is proposed in this article. An aerostatic spindle is optimized to elaborate the design procedure of the proposed method. In the first-round design, the geometrical parameters of the aerostatic bearing were optimized to improve its stiffness. Then, the key structural dimension of the aerostatic spindle is optimized in the second-round design to improve the natural frequency of the spindle. Finally, optimal design parameters are acquired and experimentally verified. This research guides the optimal design of aerostatic spindles considering the FSI effect.
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Kondo, Ryo, Daisuke Kono, and Atsushi Matsubara. "Evaluation of Machine Tool Spindle Using Carbon Fiber Composite." International Journal of Automation Technology 14, no. 2 (2020): 294–303. http://dx.doi.org/10.20965/ijat.2020.p0294.

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Spindle is one of the most important component of machine tools because spindle’s performance including thermal property and dynamic property greatly influences the accuracy and productivity in machining process. This study investigates the effect of the application of carbon fiber reinforced plastic (CFRP) to the spindle shaft on the performance of machine tool spindles. CFRP and steel spindle shafts with the same geometry were developed for fair comparison. Thermal and dynamic properties of the developed shaft and spindle unit were evaluated and compared. The experimental and simulation results showed that the CFRP spindle shaft improved the axial thermal displacement and dynamic stiffness. The axial thermal displacement was decreased to 1/3 of that of the steel spindle. The compliance was also decreased to 1/2. The design of the thermal displacement distribution around the bearing should be an important issue in the CFRP spindle for the thermal stability of the dynamic property.
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Chen, Shao Hsien, Shang Te Chen, and Chien Cheng Hsu. "Study on Axial Oil Chamber Design for High Performance Hydrostatic Spindle." Applied Mechanics and Materials 701-702 (December 2014): 869–73. http://dx.doi.org/10.4028/www.scientific.net/amm.701-702.869.

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Ultra-precision machining and large-size equipments are themostprimary development trend ofcurrentmachine tooland hydrostatic products arekeytechnologiesof ultra-precision machining equipments. However, these equipmentsmostlyprocess miniature components, thus the adopted tools are relatively small and the spindlesare mainlybuilt-in types of HSK32-HSK25 withover30,000r. Some processing equipments are even equipped with hydrostatic or gas-static spindles. The studyextends theaxialoilchamberto radialonesto expand theaction areaofaxialoil pressureand form a closed oil seal edge by combining theradialclearance. Consequently, theaxialbearing stiffnesscan be enhancedtoenlarge the application scope of hydrostatic spindle. The designmodecan enhanceaxialstiffness ofspindle modulesor strengthenthe stiffness of hydrostatic spindlein a ball screw.
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Wang, Zhan Zhong, Lin Zhang Cheng, Xiao Ke Fan, and Yan Jun Han. "Structural Design and Kinematics Analysis of Oblique Crossing 3DOF NC Spindle." Advanced Materials Research 317-319 (August 2011): 1908–13. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.1908.

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Based on the study of 3R oblique non-spherical wrist and the analysis of the NC machine spindle’s function, the concept of a oblique crossing 3DOF NC spindle was offered and the 3D model of this 3DOF NC spindle was made with Solidworks software. At the same time, the kinematics model of this 3DOF NC spindle was setup with D-H parameter method and the kinematics & workspace of this 3DOF NC spindle were analyzed and simulated. Simulation results indicated that this 3DOF NC spindle, with compacted-structure, low inertness and considerable flexibility, could be in any gesture in the 3D space, and could expand the work range of the NC machine.
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Chen, Shao Hsien, Shang Te Chen, and Chien Cheng Hsu. "The Impact of Different Axial Oil Chamber Design on Hydrostatic Spindle." Applied Mechanics and Materials 789-790 (September 2015): 296–99. http://dx.doi.org/10.4028/www.scientific.net/amm.789-790.296.

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High-precision machining and large-scale tool are the most primary development trend of current machine tool and hydrostatic products are key technologies of high-precision machining equipments. However, these equipments mostly process miniature components, thus the adopted tools are relatively small and the spindles mainly use are mainly built-in types of HSK32 to HSK25 with revolutions speed over 25,000rpm. Some processing equipments are even equipped with hydrostatic or gas-static spindles. The study extends the axial oil chamber to radial ones to expand the action area of axial oil pressure and form a closed oil seal edge by combining the radial clearance. Consequently, the axial bearing stiffness can be enhanced to enlarge the application scope of hydrostatic spindle. The design mode can enhance axial stiffness of spindle modules or strengthen the stiffness of hydrostatic spindle in a ball screw.
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Li, Chao, and Ying Xue Yao. "Dynamic Characteristic Analysis of High-Speed Milling Motorized Spindle Based on ANSYS Workbench." Key Engineering Materials 579-580 (September 2013): 530–35. http://dx.doi.org/10.4028/www.scientific.net/kem.579-580.530.

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The DGZX - 1425 high-speed milling motorized spindle which is made and designed independently by Hao Zhi electrical and mechanical company in Guangzhou China is made as the research object, the method of establishing numerical simulation model for the spindle units dynamic performances is established, and the design of the spindles structure has been verified reasonable. Modal analysis of the spindle has been completed in ANSYS Workbench to get the first six natural frequencies and mode shapes. Harmonic analysis of the spindle is also completed to obtain the dynamic stiffness at the highest speed. Modal test and vibration test of the assembled spindle are also processed, which have verified the accuracy of the finite element method. The paper has provided a theoretical basis for the motorized spindles design, structural optimization and the improvement of the dynamic performances.
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Oh, Dong Ho, Nam Hoon Lee, Ja Choon Koo, Hyeon Ki Choi, and Yeon Sun Choi. "Nonsymmetric Groove Pattern Design for Precise Micro-Spindles." Key Engineering Materials 326-328 (December 2006): 1595–98. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.1595.

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As the fluid dynamic bearing spindles are to be actively adopted to various small form factor mobile applications, mechanical specifications for the motors have been aggressively changed to pursue the fierce information technology sector market trend. One of the major technological challenges for the spindles to be successfully employed in the applications is the reduction of power consumption since the most of the mobile applications operate with a limited power source at relatively lower voltage. Recognizing implication of the power consumption that of course affects stiffness of the spindle, few of options for mechanical designers are available but either lowering rotational speed or adopting thinner lubricant. In the present work, a novel design solution for alleviating side effect of the lower stiffness spindle is introduced and verified.
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Dissertations / Theses on the topic "Spindle Design"

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Kutlu, Asim. "Design and development of a lathe spindle." Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187477.

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Verktygsmaskiner möjliggör tillverkning av materiekroppar med olika form. Svarvar är de vanligaste maskinerna för att bearbeta runda detaljer. Man kan säga att en svarvspindeln möjliggör hela skärprocessen och att den därför är den viktigaste komponenten i en svarv. En svarvaxel, eller en spindel, bearbetar det roterande ämnet med ett stationärt skärverktyg, och materialet tas bort vid skärverktygets kontakt med ämnet.Det här arbetet syftar till att konstruera en spindel som uppfyller en given kravspecifikation. Specifikationen innehåller prestandakrav, som rotationshastighet och kraft, geometri och dimensionskrav, som storlek och håldiameter, samt vilka komponenttyper som ska användas, som t.ex. motorn.I enlighet medprestandakravet definieras maximalt lastscenario. Med givna svarvningsparametrar beräknas skärkraften på materialet vid dess kontakt med skärverktyget. En inbyggd motor som är tillräckligt kraftfull och uppfyller hastighets- och effektkraven väljs och en preliminär konstruktion skapas med valda lager, lagerordningar och axelmaterial.Beteendet av den preliminära spindelkonstruktionen, under påverkan av skärkrafter och rotation analyseras statiskt och dynamiskt med hjälp av FEM och analytiska modeller. Inom ett givet område optimeras avståndet mellan lagren, vilka utgör spindelns stöd.Genom verifikation och optimering av den preliminära konstruktionen skapas den slutliga detaljkonstruktionen. Slutkonstruktionen innefattar alla nödvändiga detaljer och viktiga krav beaktas och balanseras, som att vara tillverkningsbar och monterbar, tätningssystem, ett system för hastighetsmätning och lägesmätning, kabelvägar och andra nödvändiga punkter. I slutänden konstrueras en spindel som uppfyller den definierade kravspecifikationen.<br>Machine tools enable the industry to shape almost any material by a variety of methods. Lathes are one of the most common machines to cut circular parts with precision and accuracy. And the spindle of a lathe can be entitled as the most critical mechanical component which makes the cutting process possible. A lathe spindle rotates the workpiece to be cut against a stationary rigid cutting tool, therefore removing material through the contact edge. In this thesis, a spindle is aimed to be designed which complies with a set of specifications defined. These specifications consists of performance requirements such as speed and power, dimensional constraints for space and bore diameter, and component types which must be used, such as for the motor.Based on the performance requirements, a maximum loading case with cutting parameters is defined. With these cutting parameters, cutting forces acting to the material from at the contact point with the cutting tool are calculated. A built-in motor with sufficient power and speed specifications is selected based on the maximum cutting forces and speed requirements. A preliminary design is made up by selecting bearings, bearing arrangements and shaft material.With static and dynamic analysis conducted on the preliminary design through analytical models and FEM, the behavior of the spindle is investigated separately under the cutting forces and during the rotation. Within an allowable range, optimization is made on the bearing span distances which are the support locations for the spindle.Following the verification and optimization of the preliminary design, the final detail design of the spindle is made. The final design includes the design of all the necessary parts, by taking the manufacturability, assemblability, sealing design, a system for speed and position measurements, cable paths and more necessary points into account. Ultimately, a spindle which meets the requirements and specifications successfully is designed as the expected outcome of this thesis.
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Usman, Irfan-ur-rab. "Rotary-axial spindle design for large load precision machining applications." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/30163.

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Normal stress electromagnetic actuators can be used as both an axial bearing and an in-feed motor in precision machine tool applications that require only millimeter-range axial stroke, such as silicon wafer face grinding or meso-machining. The rotary cutting stage may be integrated with the axially-feeding stage in a rotary-axial architecture. This typology allows the use of independent rotary and axial actuators acting on a single moving mass, rather than an axial actuator moving an entire rotary motor assembly in the feed direction as in typical machine tool architectures. Non-collocated resonances are therefore minimized and thrust and radial stiffness is increased through the elimination of intermediate lateral and thrust bearings, and achievable closed loop positioning performance is improved. This thesis presents the working principle, design, and analysis of radially-biased electromagnetic bearing/actuators for large load precision rotary-axial spindle applications, and the integration of such an actuator in a full scale prototype to be used as a silicon wafer face grinder. The experimental results indicate that the rotary-axial spindle with radially-biased thrust bearing/actuator is capable of achieving less than 7 nm resolution over a 1.5 mm axial stroke, a worst case load capacity of approximately 5000 N and a best case load capacity of over 8000 N, with rotary-axial coupling of less than 30 nm axial error at 3000 rpm.
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Heo, Baekho. "Vibration reduction of rotating disk/spindle systems via structural design /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/7071.

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Pathak, Jay Prakash. "Design, assembly, and testing of an ultra-high-speed micro-milling spindle." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0002847.

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Zapletal, Jan. "Návrh vřetene obráběcího stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241859.

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This master’s thesis deals with design of spindle for small three axis milling machine. The first part of this thesis includes research in milling spindles and overview of several spindles from different manufacturers. The second part deals with calculation of necessary parameters, design of spindle and subsequent simulation verification. This thesis also includes a 3D model of spindle, assembly drawing and four manufacturing drawings.
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Erturk, Alper. "Dynamic Modeling Of Spindle-tool Assemblies In Machining Centers." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607236/index.pdf.

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Regenerative chatter is a well-known machining problem that results in unstable cutting process, poor surface quality, reduced material removal rate and damage on the machine tool itself. Stability lobe diagrams supply stable depth of cut &amp<br>#8211<br>spindle speed combinations and they can be used to avoid chatter. The main requirement for generating the stability lobe diagrams is the system dynamics information at the tool tip in the form of point frequency response function (FRF). In this work, an analytical model that uses structural coupling and modification methods for modeling the dynamics of spindle-holder-tool assemblies in order to obtain the tool point FRF is presented. The resulting FRF obtained by the model can be used in the existing analytical and numerical models for constructing the stability lobe diagrams. Timoshenko beam theory is used in the model for improved accuracy and the results are compared with those of Euler-Bernoulli beam theory. The importance of using Timoshenko beam theory in the model is pointed out, and the circumstances, under which the theory being used in the model becomes more important, are explained. The model is verified by comparing the results obtained by the model with those of a reliable finite element software for a case study. The computational superiority in using the model developed against the finite element software is also demonstrated. Then, the model is used for studying the effects of bearing and contact dynamics at the spindle-holder and holder-tool interfaces on the tool point FRF. Based on the results of the effect analysis, a new approach is suggested for the identification of bearing and interface parameters from experimental measurements, which is demonstrated on a spindle-holder-tool assembly. The model is also employed for studying the effects of design and operational parameters on the tool point FRF, from the results of which, suggestions are made regarding the design of spindles and selection of operational parameters. Finally, it is experimentally demonstrated that the stability lobe diagram of an assembly can be predicted pretty accurately by using the model proposed, and furthermore the stability lobe diagram can be modified in a predictable manner for improving chatter stability.
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Turk, Amanda C. (Amanda Christine). "Design and fabrication of a device to characterize spindle performance as a function of bearing preload." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/75453.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Page 98 blank. Cataloged from student submitted PDF version of thesis.<br>Includes bibliographical references (p. 83-84).<br>This paper describes the design and fabrication of an apparatus to characterize the performance of lathe spindles as a function of spindle bearing preload. The apparatus will be used to assist undergraduate students enrolled in 2.72 in understanding mechanical design concepts. In order to assess spindle performance, the apparatus measures the radial stiffness, radial error motion, and running torque of a spindle at different preload levels. The data obtained using the apparatus can be used by students to select the optimal preload level for a spindle. The apparatus was designed as four subsystems (one for each measurement) that were integrated into a cohesive measurement system. The apparatus is designed to be as small, light, and user-friendly as possible, in order for students to use it effectively. The apparatus is capable of measuring bearing preload up to 10,000 lbs with a linearity of 0.05% and radial error motion with an accuracy of +/-0.00012 in. (3 [mu]m). It can measure the radial stiffness of the spindle for applied loads up to 500 lbs and running torque up to 443 in-lbs (50 N-m). The fabrication and assembly of the mechanical apparatus, as designed, were completed.<br>by Amanda C. Turk.<br>S.B.
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Sedlák, Pavel. "Konstrukce multifunkčního obráběcího centra." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229854.

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This master thesis deals with the construction of multi-functional machining centre. The theoretical part describes the history of lathes, trends in production of lathes and individual machine parts. The practical part is the structural design of the spindle with positioning in the C axis, the second spindle (including drive in Z axis) and the turret (including drive in the X and Z axis). A 3-D model of the entire lathe assembly modeled in Autodesk Inventor 2010 is also included.
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Wichert, Torsten. "Design and Construction Modifications of Switched Reluctance Machines." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1235569858100-62518.

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Although the design principles of the Switched Reluctance Machines (SRMs) are available in different fragments in numerous bibliography positions, there no exists the complex design procedure of whole drive system taking into account the SR Machine, control system and supply device as well. The hybrid design method for SRM drives with application of new analytical calculation methods, finite element method and simulation models is proposed in this thesis. The calculation/design system is characterised by important effectivity and reliability. The new possibilities in analytical determination of saturation effects and core losses under various modes of control, including sensorless method, are also taken into account. The correctness of the proposed design algorithms are verified by laboratory tests made on three motor prototypes manufactured in industry for concrete application. This dissertation provides the elements indispensable for more accurate and complex analysis and design of drives with switch reluctance motors. The elements of electrical motor and control system design as well as the considerations on the choice of supply device and controller subsystems are jointed in the thesis for final receiving of the design tool for considered industrial drive system.
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Wichert, Torsten. "Design and Construction Modifications of Switched Reluctance Machines." Doctoral thesis, Technische Universität Warschau, 2008. https://slub.qucosa.de/id/qucosa%3A258.

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Although the design principles of the Switched Reluctance Machines (SRMs) are available in different fragments in numerous bibliography positions, there no exists the complex design procedure of whole drive system taking into account the SR Machine, control system and supply device as well. The hybrid design method for SRM drives with application of new analytical calculation methods, finite element method and simulation models is proposed in this thesis. The calculation/design system is characterised by important effectivity and reliability. The new possibilities in analytical determination of saturation effects and core losses under various modes of control, including sensorless method, are also taken into account. The correctness of the proposed design algorithms are verified by laboratory tests made on three motor prototypes manufactured in industry for concrete application. This dissertation provides the elements indispensable for more accurate and complex analysis and design of drives with switch reluctance motors. The elements of electrical motor and control system design as well as the considerations on the choice of supply device and controller subsystems are jointed in the thesis for final receiving of the design tool for considered industrial drive system.
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Books on the topic "Spindle Design"

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Renkens, Michaël Josepha Mathijs. Design of an axially controlled spindle unit for high precision diamond turning. s.n.], 1997.

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Spinazzi-Lucchesi, Chiara. The Unwound Yarn. Edizioni Ca' Foscari, 2018. http://dx.doi.org/10.30687/978-88-6969-232-1.

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This book reviews certain of the most important archaeological finds of textile tools, in order to draw a picture of the spinning and weaving technologies adopted in the Levant and Egypt from the Neolithic to the Persian period. A brief description of the objects found at several sites is provided to highlight differences of materials and tool design in order to better understand developments in weaving technology across this region. Textile tools housed in the Museo Egizio di Torino are also examined here for the first time. These include spindles and spindle whorls, bone spatulae and needles, which for the most part originate from Schiaparelli’s excavations at the Workers’ village of Deir el-Medina. A general analysis is provided, which compares these objects to the tools known from other sites in Egypt, as well as a catalogue, which provides further description and exact measurements for each object of the collection.
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Symposium, on Spinal Implants Are We Evaluating Them Appropriately? (2001 Dallas Tex ). Spinal implants: Are we evaluating them appropriately? ASTM International, 2003.

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P, Fleming David, and NASA Glenn Research Center, eds. Rotordynamic influence on rolling element bearing selection and operation. National Aeronautics and Space Administration, Glenn Research Center, 2001.

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International, ASTM, ed. Static and dynamic spinal implants: Are we evaluating them appropriately? ASTM International, 2012.

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Breshears, John. Tools and technology, body and world: A structurally dynamic pedestrian bridge. Rice University School of Architecture, 1993.

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Joy, Higgs, ed. A history of seating, 3000 BC to 2000 AD: Function versus aesthetics. Cambria Press, 2010.

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Pynt, Jenny. A history of seating, 3000 BC to 2000 AD: Function versus aesthetics. Cambria Press, 2010.

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Sarkodie-Gyan, Thompson. Neurorehabilitation devices: Engineering design, measurement, and control. McGraw-Hill, 2006.

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Cipriani, Alberto, Alessio Gramolati, and Giovanni Mari, eds. Il lavoro 4.0. Firenze University Press, 2018. http://dx.doi.org/10.36253/978-88-6453-649-1.

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Le ricerche del presente volume si fondano sul nesso tra lavoro e Quarta Rivoluzione industriale. Su questo piano le domande sono numerose. Qual è la natura del lavoro 4.0? Qual è il rapporto tra rivoluzione tecnologica e occupazione? Quali sono i diritti del lavoro nell’epoca dei nuovi modelli di business? L’innovazione può essere implementata senza il superamento della subalternità novecentesca e l’approdo a nuove forme di libertà e responsabilità del lavoro? La digitalizzazione e le nuove forme di organizzazione dell’impresa mutano i rapporti di lavoro e favoriscono nuove forme di collaborazione e di conflitto? La formazione, la qualità e la libertà nel lavoro sono più importanti del salario? La progettazione e il design dell’impresa come si pongono nei confronti della tecnologia e del lavoro? La digitalizzazione spinge l’economia della conoscenza a determinare nuove forme di lavoro? Quali progetti da parte dei soggetti coinvolti, a cominciare dai lavoratori, perché queste trasformazioni siano un passo avanti nelle condizioni di lavoro e nelle relazioni industriali? Queste e molte altre domande sono alla base dei saggi raccolti nel volume cui hanno collaborato autori di diversa formazione ed esperienza: accademici, giornalisti, imprenditori, manager, operatori, sindacalisti e rappresentanti sindacali.
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Book chapters on the topic "Spindle Design"

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Borisavljevic, Aleksandar. "Design of the High-Speed-Spindle Motor." In Limits, Modeling and Design of High-Speed Permanent Magnet Machines. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33457-3_7.

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Cai, Chi-lan, and Jia-yi Zhou. "Optimal Design of Interference Fit for High-Speed Motorized Spindle." In Advances in Mechanical Design. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7381-8_21.

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Li, Zhaolong, Bo Zhu, Bingren Cao, Yingtao Liu, and Xiaodong Yang. "Research on Thermal Characteristics of the High-Speed Motorized Spindle." In Advances in Mechanical Design. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7381-8_31.

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Xu, Jianan, Xin Gao, and Dongyue Qu. "Multi-objective Topology Optimization for Supporting Plate of Winch Drum Spindle." In Advances in Mechanical Design. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6553-8_27.

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Smajić, Hasan, Milos Knezev, Aleksander Stekolschik, and Aleksandar Zivkovic. "High Speed Spindle Simulation Using Multibody Siemens NX MCD." In Machine and Industrial Design in Mechanical Engineering. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-88465-9_61.

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Yong-xian, Liu, Zhao Jin-fu, and Wang Peng-jia. "The System of Spindle Optimization Design Based on GA." In New Trends in Mechanism and Machine Science. Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4902-3_81.

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Braier, Z., P. Šidlof, V. Čejka, and P. Žďárek. "New Method of Contactless Measurement and Analysis of CNC Machine Spindle Lopping." In Advances in Mechanism Design II. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44087-3_49.

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Krol, Oleg, and Volodymyr Sokolov. "Modeling of Spindle Node Dynamics Using the Spectral Analysis Method." In Advances in Design, Simulation and Manufacturing III. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-50794-7_4.

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Qiu, Jian, Yuhou Wu, Cong Geng, and Renpeng GE. "Investigation of Developing Cutting Performance of Economic CNC Lathe by Shorten the Spindle Transmission Link." In Advances in Mechanical Design. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6553-8_12.

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Li, You Tang, Ping Ma, and Chang Feng Yan. "Anti-Fatigued Criterion of Annularly Breached Spindle on Mechanical Design." In Advanced Nondestructive Evaluation I. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-412-x.755.

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Conference papers on the topic "Spindle Design"

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Agba, Emmanuel I., and Majid Babai. "Design of Hydraulic Motor Spindle for High Speed Machining." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1052.

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Abstract This paper presents the design of a hydraulic motor driven spindle for the processing of metals and composite materials at high rotational speeds. Existing technologies applicable to spindles and spindle holders under severe operating conditions were reviewed. A conceptual design of the hydraulic spindle system was developed. A strong indication of distinct increase in spindle life and gains in cutting power at higher rotational speeds when compared to the conventional electric motor driven spindles underscored the need for the new spindle system.
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Ramasubramanian, Shankar Ganesh, Rangharajan Venkatesan, Mrigank Sharad, Kaushik Roy, and Anand Raghunathan. "SPINDLE." In ISLPED'14: International Symposium on Low Power Electronics and Design. ACM, 2014. http://dx.doi.org/10.1145/2627369.2627625.

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Noel, David, Mathieu Ritou, Sebastien Le Loch, and Benoit Furet. "Bearings Influence on the Dynamic Behavior of HSM Spindle." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82563.

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The aeronautic industry requires high speed and high power spindles to obtain high material removal rates during long rough milling operations. The weakness of HSM spindle is the bearings, although high precision hybrid ball bearings have been developed to achieve this critical application. Inadequate use of spindles inevitably leads to shortened lifetimes. Choosing the operating conditions is a required step before machining applications. It can be achieved through either experimental tests or numerical modeling that leads to stability lobe diagrams. Stability of cuts relies on the dynamic behavior of the spindle, which is particularly due to the eigenfrequencies of the tool-shaft assembly. The frequencies depend on bearing stiffness that can change under operating conditions. That is why the impact of cutting conditions and bearing parameters on its stiffness are studied in the paper. A five degrees of freedom model of angular ball bearing is briefly presented. A complete bearing model is introduced. The originality of the approach is the complete technological modeling, notably of the radial expansions of inner and outer rings of bearing. A non-linear expression is established from continuum mechanics model. The influence of geometry of bearing, operating conditions and design parameters of spindle on the bearing stiffness are established and analysed. Then, modal analyses of the tool-spindle assembly are carried out in relation to the varying bearing stiffness. Finally, significance of the approach is demonstrated through the analyses of Frequency Response Function.
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Chen, C. H., K. W. Wang, and Y. C. Shin. "An Integrated Approach Toward the Dynamic Analysis of High-Speed Spindles: Part I — System Model." In ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0210.

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Abstract Experimental evidence [Shin, 1992] has shown that the natural frequencies of high speed spindles with angular contact ball bearings decrease with increasing rotational speed. A recent study [Wang, et al., 1991] illustrated that this phenomenon is caused by stiffness change of the bearings. A simplified approximation was used in the analysis to examine the bearing radial stiffness at high speeds. While the investigation explained the experimental observations in a qualitative sense, the analytical results so far are not sufficient to quantitatively describe the spindle behavior under high speed operations due to the approximations made in the modeling process. This paper presents an integrated approach toward the modelling of flexible spindles with angular contact ball bearings from basic principles. The local dynamics of the bearings are coupled with the global shaft motion. The model derived includes both the longitudinal and transverse vibrations of the shaft interacting with the nonlinear bearings. The influences of shaft speed on the bearing stiffness matrix and the system frequencies have been studied. It is shown that the spindle dynamic behavior can vary substantially as speed increases due to the bearing gyroscopic moment and centrifugal force. These effects have been ignored in most of the previous spindle models. Lab tests were conducted to validate the model. The analytical predictions are quantitatively verified by the experimental results.
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Gibson, Alex O., Jeffrey L. Stein, and Jay F. Tu. "A Thermomechanical Model of Machine Tool Spindles for Use in the Design of Reconfigurable Angular Contact Spindle Bearing Load Control Systems." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-1071.

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Abstract Thermally induced bearing loads have long been recognized as a key factor impacting the reliability and performance of machine tool spindle systems. This is particularly true for reconfigurable machine tool spindles which may experience a wide range of external loads, processes and spindle speeds. Recent research on a roller bearing spindle has shown that it may be possible to control these loads by controlling the temperature distribution within the spindle housing. As this research focused on thermally induced loads in roller bearings, the bearing load model used was largely limited to a radial heat transfer/thermal expansion model. The purpose of this paper is to present a first step model for developing a methodology for designing bearing load monitoring and control systems for reconfigurable angular contact bearing spindles. The proposed model focuses on the thermally and mechanically induced spindle bearing loads in a back to back angular contact bearing pair that are due to radial and axial thermal expansion as well as the centrifugal forces and moments of the bearing balls. Simulation results demonstrate that the proposed model is capable of predicting the interactions between bearing loads and spindle deflections that are likely to be important in the design of future reconfigurable machine tool spindle bearing load monitoring and control systems.
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Gao, Siyu, Kai Cheng, and Hui Ding. "Multi-Physics Simulation Based Design and Analysis of a High Speed Aerostatic Spindle and its Performance Assessment." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34086.

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High speed aerostatic spindles operating at a speed up to 200,000 r/min are a complex product with a multi-physics nature resulted from embedded mechanical-thermal-fluidic-electromagnetic fields. It is much needed to have a comprehensive analysis on the multi-physic interactions within a high speed aerostatic spindle, which is essential for design of the spindles working at much higher speeds and accuracy in various increasingly stringent engineering conditions. This paper presents a multi-physics integrated modelling approach for design and analysis of the high speed aerostatic spindle, including thermal, electromagnetic, mechanical and fluidic analysis models. The heat source, heat transfer mechanism and heat sinks of the spindle system are comprehensively investigated. Furthermore, air film pressure distribution is studied to lead to optimal design and analysis of loading capacity and stiffness of the aerostatic bearings. The multi-physics modelling is implemented using the CFD-FEA integrated approach and validated experimentally. It is shown that the multi-physics integrated modelling is able to simulate the performance characteristics of the spindle system accurately.
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Noel, David, Sebastien Le Loch, Mathieu Ritou, and Benoit Furet. "HSM Spindle Model Updating With Physical Phenomena Refinements." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-13141.

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The modeling of High Speed Machining (HSM) spindles is a complex task due to the numerous physical phenomena involved in the dynamic behavior. Modeling is still rarely used in the industry, although sophisticated research work has been achieved. The boundary conditions of rotor models, which correspond to the ball bearings, are crucial and difficult to define. Indeed, they affect the dynamic behavior of the rotor in a non-linear and sometimes in an unpredictable way. The aim of the paper is to determine a relevant spindle model, i.e. the adequate level of complexity. To do so, a dynamic bearing model is introduced and the axial model of a spindle is established in relation to the preloaded bearing arrangement. Then, the operating stiffness of the spindle has been obtained experimentally with a new specific device that applies axial load and measures the resulting displacement, whatever the spindle speed. The model updating with the experimental data combined to sensibility analysis have led to the model refinement with additional physical phenomena, in order to account for non-linearities observed experimentally. The parameters of the model are also identified experimentally. As a result, a relevant spindle model is obtained and validated by the good agreement between simulations and experiments.
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Li, John, Vijayachander Musukula, and Mohamed B. Trabia. "Design of Machine Tool Spindle for Minimum Workpiece Cylindricity Error." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0115.

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Abstract The design of machine tool spindle for minimum cylindricity error is presented. The shape of the spindle portion between the bearings, usually cylindrical, is reconfigured to increase the spindle rigidity. Two methods of reconfiguration are presented. In the first method, the spindle is reshaped as a smooth body of revolution. In the second method, the spindle is reshaped as a stepped shaft. Effects of bearings rigidity and fatigue stresses are also considered.
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Vyasa, Rupal, and Raghu Echempati. "Design and Analysis of an Example Lathe Spindle." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39665.

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This paper discusses the modeling and analysis of an example medium speed medium precision lathe spindle. This and few other similar topics have been assigned as term projects in an introductory senior undergraduate/graduate level finite element analysis course taught at Kettering University. The experiences and the general feedback from the students of the class show satisfactory organization of the course material that includes modeling and analysis of real life examples. With reference to the specific topic on design of machine tool spindles, it is not a new area, however, it is generally taught at the graduate and research levels. Use of modern computational tools to perform iterative design and analysis calculations of such spindles make the senior undergraduate and/or graduate master students aware of the implications of modeling a real life system using the 1D and 3D finite beam elements and to validate those results by a CAE tool. Final course projects such as this serve as a good learning tool to the graduating engineers. Sample results obtained from various CAE tools such as UG-NX 7.5 are presented in the paper and discussed.
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Deshpande, Moreshwar, and C. D. Mote. "Intermodal Coupling in Flexible Spinning Disk-Spindle Systems." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8143.

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Abstract The coupling between the disk and spindle vibration modes of a rotating disk-spindle system is analyzed through the free vibrations of a rotating, flexible spindle with N attached flexible disks. The spindle is modeled as an extensible Kirchhoff-Love rod and the disks as Kirchhoff plates. Couplings between the longitudinal, torsional and flexural deformations of the spindle and the transverse and in-plane motions of the disk are studied analytically. A kinematically rich model captures couplings that have not been predicted previously. Discretization of these modes as a series of orthonormal functions allows for the construction of the characteristic matrix. The structure of this matrix is exploited to partition the eigenvalue problem into six natural classes and to provide simple, exact rules governing the coupling between the modes of the disk-spindle system. The longitudinal spindle vibration modes and the zero nodal diameter transverse disk modes are coupled inertially at all rotation speeds. The torsional spindle modes couple to the zero nodal diameter in-plane disk modes at all non-zero rotation speeds. This coupling is absent in a stationary disk-spindle system. For non-zero rotation speeds, the flexural modes of the spindle in the two orthogonal planes containing the undeformed spindle centerline and the one nodal diameter transverse and in-plane disk modes couple. The one nodal diameter transverse disk modes couple to the one nodal diameter in-plane disk modes through the flexural compliance of the spindle; this coupling cannot be observed through study of the disk alone.
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Reports on the topic "Spindle Design"

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Wouter Montfrooij. designer phase transitions in lithium-based spinels. Office of Scientific and Technical Information (OSTI), 2011. http://dx.doi.org/10.2172/1042954.

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Yang, Xinwei, Huan Tu, and Xiali Xue. The improvement of the Lower Limb exoskeletons on the gait of patients with spinal cord injury: A protocol for systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, 2021. http://dx.doi.org/10.37766/inplasy2021.8.0095.

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Review question / Objective: The purpose of this systematic review and meta-analysis was to determine the efficacy of lower extremity exoskeletons in improving gait function in patients with spinal cord injury, compared with placebo or other treatments. Condition being studied: Spinal Cord Injury (SCI) is a severely disabling disease. In the process of SCI rehabilitation treatment, improving patients' walking ability, improving their self-care ability, and enhancing patients' self-esteem is an important aspect of their return to society, which can also reduce the cost of patients, so the rehabilitation of lower limbs is very important. The lower extremity exoskeleton robot is a bionic robot designed according to the principles of robotics, mechanism, bionics, control theory, communication technology, and information processing technology, which can be worn on the lower extremity of the human body and complete specific tasks under the user's control. The purpose of this study was to evaluate the effect of the lower extremity exoskeleton on the improvement of gait function in patients with spinal cord injury.
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Wen, Bei, Li Xu, and Yuguang Huang. Which minimally invasive therapy is most effective for the treatment of postherpetic neuralgia? An update meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, 2022. http://dx.doi.org/10.37766/inplasy2022.10.0114.

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Review question / Objective: Which minimally invasive therapy is the best choice to alleviate pain for patients suffering from postherpetic neuralgia? Eligibility criteria: The eligibility criteria are interpreted under the PICOS (P, participants; I, interventions; C, comparison; O, outcomes; S, study design) framework. (1) P: ParticipantsInclusion criteria: Patients suffering from postherpetic neuralgia (the pain lasting more than 3 months after the onset of herpes zoster rash eruption or more than 1 month after the vesicles have healed).Exclusion criteria: 1. Patients who had other neuropathic pain; 2. Patients with acute or subacute zoster-related pain.(2) I: Interventions Inclusion criteria: Interventional treatments applied to PHN patients, as follows: 1) nerve block (including epidural block, intrathecal block, dorsal root ganglion block, intercostal nerve block, paravertebral block, erector spinae plane block);2) subcutaneous injection (including subcutaneous injection of normal saline, local anesthetics, corticosteroids, MeB12 as well as local infiltration);3) stellate ganglion block;4) subcutaneous botulinum toxin type A injection;5) pulsed radiofrequency with or without.
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Bhushan, Sandeep, Huang Xin, and Xiao Zongwei. Ultrasound-guided erector spinae plane block for postoperative analgesia in patients undergoing liver surgery: what we might know from a meta-analysis of Randomized control trials. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, 2022. http://dx.doi.org/10.37766/inplasy2022.1.0094.

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Condition being studied: ESPB as an emerging regional technique has been well established in many surgeries, including reduce opioid demands, decrease pain score and improver sleep quality, etc. But, apply ESPB in liver surgery is limiting and remains uncertain, it is time to conduct one meta-analysis to reveal the performance of ESPB in liver surgery. Eligibility criteria: All published full-article RCTs comparing the analgesic efficacy of ESPB with control in adult patients undergoing any liver surgeries were eligible for inclusion. There were no language restrictions, Moreover, we also excluded case reports, non-RCT studies, incomplete clinical trials, and any trials used multiple nerve blocks. We also excluded any conference abstracts which could not offer enough information about the study design, or by data request to the author.
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Chou, Roger, Jesse Wagner, Azrah Y. Ahmed, et al. Treatments for Acute Pain: A Systematic Review. Agency for Healthcare Research and Quality (AHRQ), 2020. http://dx.doi.org/10.23970/ahrqepccer240.

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Objectives. To evaluate the effectiveness and comparative effectiveness of opioid, nonopioid pharmacologic, and nonpharmacologic therapy in patients with specific types of acute pain, including effects on pain, function, quality of life, adverse events, and long-term use of opioids. Data sources. Electronic databases (Ovid® MEDLINE®, PsycINFO®, Embase®, the Cochrane Central Register of Controlled Trials, and the Cochrane Database of Systematic Reviews) to August 2020, reference lists, and a Federal Register notice. Review methods. Using predefined criteria and dual review, we selected randomized controlled trials (RCTs) of outpatient therapies for eight acute pain conditions: low back pain, neck pain, other musculoskeletal pain, neuropathic pain, postoperative pain following discharge, dental pain (surgical or nonsurgical), pain due to kidney stones, and pain due to sickle cell disease. Meta-analyses were conducted on pharmacologic therapy for dental pain and kidney stone pain, and likelihood of repeat or rescue medication use and adverse events. The magnitude of effects was classified as small, moderate, or large using previously defined criteria, and strength of evidence was assessed. Results. One hundred eighty-three RCTs on the comparative effectiveness of therapies for acute pain were included. Opioid therapy was probably less effective than nonsteroidal anti-inflammatory drugs (NSAIDs) for surgical dental pain and kidney stones, and might be similarly effective as NSAIDs for low back pain. Opioids and NSAIDs were more effective than acetaminophen for surgical dental pain, but opioids were less effective than acetaminophen for kidney stone pain. For postoperative pain, opioids were associated with increased likelihood of repeat or rescue analgesic use, but effects on pain intensity were inconsistent. Being prescribed an opioid for acute low back pain or postoperative pain was associated with increased likelihood of use of opioids at long-term followup versus not being prescribed, based on observational studies. Heat therapy was probably effective for acute low back pain, spinal manipulation might be effective for acute back pain with radiculopathy, acupressure might be effective for acute musculoskeletal pain, an opioid might be effective for acute neuropathic pain, massage might be effective for some types of postoperative pain, and a cervical collar or exercise might be effective for acute neck pain with radiculopathy. Most studies had methodological limitations. Effect sizes were primarily small to moderate for pain, the most commonly evaluated outcome. Opioids were associated with increased risk of short-term adverse events versus NSAIDs or acetaminophen, including any adverse event, nausea, dizziness, and somnolence. Serious adverse events were uncommon for all interventions, but studies were not designed to assess risk of overdose, opioid use disorder, or long-term harms. Evidence on how benefits or harms varied in subgroups was lacking. Conclusions. Opioid therapy was associated with decreased or similar effectiveness as an NSAID for some acute pain conditions, but with increased risk of short-term adverse events. Evidence on nonpharmacological therapies was limited, but heat therapy, spinal manipulation, massage, acupuncture, acupressure, a cervical collar, and exercise were effective for specific acute pain conditions. Research is needed to determine the comparative effectiveness of therapies for sickle cell pain, acute neuropathic pain, neck pain, and management of postoperative pain following discharge; effects of therapies for acute pain on non-pain outcomes; effects of therapies on long-term outcomes, including long-term opioid use; and how benefits and harms of therapies vary in subgroups.
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