Relevant bibliographies by topics / Clamping Units

Contents

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

Academic literature on the topic 'Clamping Units'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Clamping Units"

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JACHOWICZ, TOMASZ. "Construction of clamping units of injection molding machines." Polimery 50, no. 02 (February 2005): 110–17. http://dx.doi.org/10.14314/polimery.2005.110.

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Zhang, Pan Pan, Peng Cheng Xie, Dai Hua, and Wei Min Yang. "Experimental Study on Mold Separations of Plastic Injection Molding Machines with Different Clamping Units." Advanced Materials Research 87-88 (December 2009): 64–68. http://dx.doi.org/10.4028/www.scientific.net/amr.87-88.64.

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The plastic injection molding is widely used for the manufacturing of complicated-shaped and high value-added products. The plastic injection molding machine is the most important equipment for the industry. This paper focuses on the mold separation (MS) of the injection molding machines. The characteristics of the MS of injection molding machine with different clamping units are systemically analyzed, the five-hinge joint-double toggle clamping unit and the direct hydraulic pressure clamping unit included. The study points out there are several typical differences between the different clamping units. Meanwhile, it shows there is a linear relation between the MS value and the product weight, and explains why the MS signal can be used to control the injection molding process.
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Prydalnyi, Borys. "MECHATRONIC DEVICE FOR TWO-STAGE CLAMPING OF CYLINDRICAL OBJECTS IN MACHINE TOOL SPINDLES." Journal of Mechanical Engineering and Transport 13, no. 1 (2021): 118–23. http://dx.doi.org/10.31649/2413-4503-2021-13-1-118-123.

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The design of an electromechanical device for fixing cylindrical objects in the spindle units of technological equipment is presented. The new two-stage concept of the clamping process with a separated first stage is developed. The design of the presented mechanism provides advanced capabilities for control and regulation of its operating characteristics. The control system with the possibility of carrying out the first stage of clamping in automatic mode and without connecting to the upper-level control system in a technological machine is proposed. The involvement of electrical devices for the conversion and transmission of energy instead of their mechanical analogues is used as one of the promising ways to increase the performance efficiency of machine units. It helps to simplify and expand control capabilities, as well as reduce energy losses during intermediate transformations. The absence of mechanical energy converters in the proposed structure helps to reduce energy losses on intermediate transformations. The simplicity of the design expands the possibilities of integration of the proposed clamping mechanism into the structure of both new and existing technological machines in order to modernize it. This allows to achieve technical results, such as an expansion of the metalworking machines functionality, increase the level of automation of the clamping process and the accuracy of clamping objects in spindle units. The task is achieved by equipping the jaw of the clamping chuck with a special mechanism for identifying the presence of the object for clamping. For this goal, the clamping jaw is equipped with a probe that is capable of simultaneous force interaction with the object and the plunger. The plunger is rigidly attached to the magnetic element whose magnetic field has the possibility to interact with the magnetic field sensor. The sensor transmits its electrical signals to the control system of the device. The research results are aimed at meeting the requirements for effective control of clamping mechanisms with the possibility of automatic operation according to a preset algorithm for maintenance of optimal characteristics of a clamping process and a wide range of optional settings.
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Prydalnyi, B. I., and H. T. Sulym. "Mathematical Model of the Tensioning in the Collet Clamping Mechanism with the Rotary Movable Input Link on Spindle Units." Journal of Engineering Sciences 8, no. 1 (2021): E23—E28. http://dx.doi.org/10.21272/jes.2021.8(1).e4.

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Increasing machining productivity causes the cutting forces acting on tools or workpieces to grow and requires extra clamping forces for their fixation reliably. In the research, a mathematical model of the operation of the clamping mechanism for fixating cylindrical objects on the spindle of machine tools at the stage of tension is presented. The presented design of the mechanism contains screw gear and provides self-braking. Based on the calculation model, mathematical dependencies are developed to describe the relationship among the movements of the parts of the mechanism when clamping forces are growing. The presented analytical dependencies allow considering the stage of growing clamping forces separately when the conservative type of forces are prevailing in the mechanism’s operation. That stage of work when both types of forces of dissipative and potential characters exist is considered. The developed dependencies describe the position of parts of the clamping mechanism depending on the generalized coordinate. The angle of rotation of the input rotating link is used as the generalized coordinate. This fact allows calculating the position of the elements of the clamping mechanism of this type depending on time. Results of the research enhance understanding the pattern of the change in the interaction of the elements and forces that act in the mechanism during the final stage of clamping. The obtained mathematical dependencies are a precondition for the development of design methodology for mechanisms of this type.
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Othman, Mohd Hilmi, Sulaiman Hasan, and Muhammad Farid Shaari. "Development and Structural Analysis of Injection Moulding-Hydraulics Clamping Unit Testing System." Applied Mechanics and Materials 315 (April 2013): 156–60. http://dx.doi.org/10.4028/www.scientific.net/amm.315.156.

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This project is focusing on the development of a test unit for the hydraulically driven clamping system, typically used in injection moulding. The objectives of this project are to fabricate the model of clamping unit and to perform structural analysis based on the model design through simulation and by performing actual experiment on the real fabricated model. This actual test was conducted by compressing the load cell in between the two moulds halves in order to get the clamping force value through the data logger. The results obtained from simulation shows that the maximum stress of clamping unit with tie bar can achieve up to 11.2 MPa, with the safety value of 2.5. In the other hand, for the actual test experiment, the result the maximum clamping force produce is 3160N at 52bar of pressure. These values are important to be used as guidance in selecting the suitable injector part. As a conclusion, this clamping system has work properly and efficiently to be used for further research and a tool to understand more about the mechanism and the effects of clamping units in injection moulding process.
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Munro, Anna, Daniel J. Corsi, Lisa Martin, Michael Halpenny, Nicholas Dibdin, Heidi Elmoazen Elmoazzen, Mark Walker, and David S. Allan. "Obstetrical and neonatal factors associated with optimal public banking of umbilical cord blood in the context of delayed cord clamping." Clinical and Investigative Medicine 42, no. 3 (September 29, 2019): E56—E63. http://dx.doi.org/10.25011/cim.v42i3.33093.

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Purpose: To assess the association of specific newborn and maternal factors with indicators of increased blood-forming capacity in umbilical cord blood to inform strategic collection strategies that could augment the quality of units in public cord blood banks. Methods: Data regarding 268 consecutive cord blood units (CBUs) banked by Canadian Blood Services were analyzed. Multivariate analysis was performed to identify factors associated with markers of hematopoietic potency and likelihood of utilization. Results: Delayed clamping of the cord beyond 60 s was associated with reduced volume collected. Any delay in clamping of the cord was associated with reduced total nucleated cell counts. Newborn weight >4,000 g was also associated with greater blood volume in the collection but not with other measures of hematopoietic potency. Cord blood acidosis at birth (pH
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Schiergens, Tobias S., Moritz Drefs, Maximilian Dörsch, Florian Kühn, Markus Albertsmeier, Hanno Niess, Markus B. Schoenberg, et al. "Prognostic Impact of Pedicle Clamping during Liver Resection for Colorectal Metastases." Cancers 13, no. 1 (December 29, 2020): 72. http://dx.doi.org/10.3390/cancers13010072.

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Pedicle clamping (PC) during liver resection for colorectal metastases (CRLM) is used to reduce blood loss and allogeneic blood transfusion (ABT). The effect on long-term oncologic outcomes is still under debate. A retrospective analysis of the impact of PC on ABT-demand regarding overall (OS) and recurrence-free survival (RFS) in 336 patients undergoing curative resection for CRLM was carried out. Survival analysis was performed by both univariate and multivariate methods and propensity-score (PS) matching. PC was employed in 75 patients (22%). No increased postoperative morbidity was monitored. While the overall ABT-rate was comparable (35% vs. 37%, p = 0.786), a reduced demand for more than two ABT-units was observed (p = 0.046). PC-patients had better median OS (78 vs. 47 months, p = 0.005) and RFS (36 vs. 23 months, p = 0.006). Multivariate analysis revealed PC as an independent prognostic factor for OS (HR = 0.60; p = 0.009) and RFS (HR = 0.67; p = 0.017). For PC-patients, 1:2 PS-matching (N = 174) showed no differences in the overall ABT-rate compared to no-PC-patients (35% vs. 40%, p = 0.619), but a trend towards reduced transfusion requirement (>2 ABT-units: 9% vs. 21%, p = 0.052; >4 ABT-units: 2% vs. 11%, p = 0.037) and better survival (OS: 78 vs. 44 months, p = 0.088; RFS: 36 vs. 24 months; p = 0.029). Favorable long-term outcomes and lower rates of increased transfusion demand were observed in patients with PC undergoing resection for CRLM. Further prospective evaluation of potential oncologic benefits of PC in these patients may be meaningful.
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Huang, Hu, Lu Fu, Hong Wei Zhao, and Cheng Li Shi. "Finite Element Simulations of an Inchworm Type Piezo-Driven Rotary Actuator." Advanced Materials Research 945-949 (June 2014): 1396–99. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.1396.

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The inchworm-driven actuator is an important type of piezo-driven actuators, which has high loading capacity, large motion range and high motion accuracy but involves complex structures, control and motion processes. In this paper, an inchworm type piezo-driven rotary actuator was introduced. Static and modal analyses of key units of the rotary actuator such as the clamping unit and the driving unit were carried out by finite element simulations to ensure that key units of the rotary actuator have enough strength and good dynamic characteristics. These simulation results will be helpful to improve structure design of the inchworm actuator.
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Bostan, Cem, Ayşem Kaya, and Zerrin Yiğit. "Changes in pentraxin 3 and oxidative parameters during coronary bypass grafting and factors affecting postoperative atrial fibrillation." Journal of International Medical Research 48, no. 11 (November 2020): 030006052096756. http://dx.doi.org/10.1177/0300060520967561.

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Objective The performance of coronary bypass grafting (CBG) induces a type of subclinical systemic inflammatory response syndrome. The present study was performed to examine the changes in pentraxin 3 (PTX3) and oxidative parameters during cross-clamping in patients undergoing CBG. We also examined factors affecting the development of postoperative atrial fibrillation (POAF). Method This study involved 40 patients who underwent elective on-pump CBG (33 men, 7 women; mean age, 60.8 ± 8.0 years). Blood specimens were drawn before anaesthesia and after aortic cross-clamping. POAF was detected by analysing the rhythm records of telemetry units for 96 hours postoperatively. Results The mean PTX3 concentration prior to surgery was 176.3 ± 148.4 pg/mL. After cross-clamping, it increased to 947.7 ± 377.2 pg/mL. The increase was statistically significant. Twelve patients had POAF. The leucocyte count and change in the oxidative stress index were significantly higher in patients without than with POAF. Although the increase in PTX3 was higher in patients without POAF, the difference was not statistically significant. Conclusion The PTX3 concentration significantly increases during CBG. A significant change in the oxidative stress index and a more intense increase in the PTX3 concentration were seen in patients without POAF.
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Tran, Chinh L., Janella M. Parucha, Priya Jegatheesan, and Henry C. Lee. "Delayed Cord Clamping and Umbilical Cord Milking among Infants in California Neonatal Intensive Care Units." American Journal of Perinatology 37, no. 02 (March 21, 2019): 151–57. http://dx.doi.org/10.1055/s-0039-1683876.

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Objective To assess the current practice of delayed cord clamping (DCC) and to determine patient and hospital factors that predict DCC. Study Design The California Perinatal Quality Care Collaborative (CPQCC) collects data on preterm and acutely ill infants. In 2016, 52 CPQCC neonatal intensive care units (NICUs) collected data on DCC. Hospital and patient characteristics were analyzed using multivariable logistic regression. Results Of 5,332 deliveries, 1,555 (29%) newborns received DCC. Hospital rates ranged from 0 to 74.5% and increased from 21 to 37% throughout 2016. Infants delivered at <32 weeks or with birth weight <1,500 g were more likely to receive DCC (odds ratio: 2.80; 95% confidence interval: 2.33, 3.36). Cesarean delivery was associated with less likelihood of DCC (odds ratio: 0.68; 95% confidence interval: 0.59, 0.79). After risk adjustment, 17 (33%) hospitals had higher than expected DCC rate. Hospitals with less than 50 NICU beds are more likely to practice DCC, whereas Level 3 American Academy of Pediatrics NICUs, nonprofit owned hospitals, and teaching institutions were less likely to practice DCC (p < 0.001). Conclusion There are opportunities to implement quality improvement activities to increase DCC rates.
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Dissertations / Theses on the topic "Clamping Units"

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Gauchel, Wolfgang, Thilo Streichert, and Yannick Wilhelm. "Predictive maintenance with a minimum of sensors using pneumatic clamps as an example." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71204.

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In standard pneumatics, the available signals for data analytics are very limited. As a rule, no continuous status information is available. Usually only the reaching of the end position is indicated - by means of a digital signal of a proximity sensor. This paper examines whether these limited data can be used to derive usable and useful information for predictive maintenance. Pneumatic clamps in bodyin- white construction were chosen as application example. The paper describes a continuous run to investigate the basic feasibility of predictibility. In the following chapters, possibilities for error classification are discussed. Finally, the implementation of the findings in a field test is described.
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Štefánek, Tomáš. "Servoelektrická upínací jednotka." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228749.

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The aim of this thesis is to design a clamping unit with mechanical multiplier. Unit will serve as a technological clamping element in the technical equipment. My task was to select the method of construction and design driving main unit for grip jaw. I chose a solution with a mechanical multiplier. The frame unit is made up of fixed and sliding clamping jaw and is self. Unit is designed as a built module. The entire structure must be designed to meet the initial parameters specified in the award of thesis. The main parameters include clamping strength of 80kN, the extent of working stroke 15 mm and the size of a scroll, which is 250 mm. They are also listed in the award size constraints: the length, width, height dimensions and the coupling unit.
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Radermacher, Tobias, Jan Lübbert, and Jürgen Weber. "On the Compensation of Dynamic Reaction Forces in Stationary Machinery." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200212.

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This paper studies a method for active electrohydraulic force compensation in industrial scale high power applications. A valve controlled cylinder moves a mass using the force of inertia to compensate for the reaction forces of an industrial process. Two strategies for force compensation are developed and investigated in a 160 ton clamping unit of an injection moulding machine to significantly reduce the excitation. Results of the different strategies are shown and evaluated. Advantages and drawbacks of the developed electrohydraulic force compensation are discussed.
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Šťastný, Libor. "Servoelektrická upínací jednotka." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228755.

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Design servodrive clamping unit with pneumatic or mechanic multiplier. Unit has be instrumental to strength clamp parts in tension technical machines. Frame unit’s is complicate from massive and movable clamping board and is self-supporting. Unit has be solution like incorporated modulus. Target is proposal main driving period for movable clamping board. Work up proposal constructional solution, drawing listings, production drawing of the three engaged part of, BOM. Computational report must include calculations drives, constructional knots and their verification and further needed strength calculation and analyses. Proposal treatment tribotechnical knots. Analysis construction from standpoint safety in operation according to NV24/2003 and analysis safety hazards. Part of work must be and economic analysis resultant solution.
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Lai, Chi-min, and 賴啟民. "The Design and Analysis of Clamping Linkage Unit Driven by Electromagnetic Force." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/65096982704244161542.

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碩士
義守大學
機械與自動化工程學系碩士班
94
The purpose of this research is to apply an electromagnetic-driven clamping linkage unit on the micro-injection molding machine. The major design of the unit is referred to a patent , “linkage type mold clamping device driven by electromagnetic force”, and a fourbar linkage with two sliders has been utilized as the clamping linkage unit. Two types of analysis of the clamping linkage unit are expected to be drawn from this research: the kinematic analysis and the dynamic analysis. The kinematic analysis is able to compute the positions of the moving links of the clamping linkage unit and to obtain the motion characteristics such as speeds and accelerations. The other analysis, the dynamic analysis which is based on Newton''s second law of motion, the force applied on a body is proportional to the resulted acceleration of the body, is able to calculate how much force will be needed to drive the clamping linkage unit. The step followed is to measure the electromagnetic forces by experimental method and by FEM software(FEMLAB) simulation. The results from the measurements are used to conduct electromagnetic force analysis. By doing so, the applicability of the clamping linkage unit driven by electromagnetic force can be evaluated as a result of combining the outcome of the two procedures mentioned above.
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Book chapters on the topic "Clamping Units"

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Schiller, Gary F. "Clamping Unit." In A Practical Approach to Scientific Molding, 27–36. München: Carl Hanser Verlag GmbH & Co. KG, 2018. http://dx.doi.org/10.3139/9781569906873.003.

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Johannaber, Friedrich. "The Clamping Unit." In Injection Molding Machines, 145–76. München: Carl Hanser Verlag GmbH & Co. KG, 2007. http://dx.doi.org/10.3139/9783446450110.005.

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Michaeli, Walter, Helmut Greif, Gernot Kretzschmar, and Frank Ehrig. "Lesson 5: The Clamping Unit." In Training in Injection Molding, 55–62. München: Carl Hanser Verlag GmbH & Co. KG, 2001. http://dx.doi.org/10.3139/9783446401822.005.

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Proadn, Dan, Anca Monica Bucuresteanu, Emilia Balan, and Tiberiu Gabriel Dobrescu. "Safety Hydraulic Units for Semi-Finished Products Clamping Systems in Machine-Tools." In Proceedings of the 23rd International DAAAM Symposium 2012, 0323–26. DAAAM International Vienna, 2012. http://dx.doi.org/10.2507/23rd.daaam.proceedings.075.

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Conference papers on the topic "Clamping Units"

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O’Beirne, Colm, Phil Watson, Conleth O’Loughlin, David White, Alexander Hodson, Sze-Yu Ang, Sebastiaan Frankenmolen, Jesper Hoj-Hansen, Matthew Kuo, and Toby Roe. "Pipe Clamping Mattresses to Mitigate Flowline Walking; Physical Modelling Trials on Three Offshore Soils." In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/31064-ms.

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Abstract Pipe clamping mattresses (PCMs) are a relatively new system for providing anchoring force to pipelines, to mitigate offshore flowline ‘walking’. They represent a cost-effective and highly efficient alternative to anchor piles, rock dump and conventional concrete mattresses. The system comprises a hinged concrete structure that clamps onto a section of laid pipeline, with concrete ballast logs securing the clamping action – with the benefit that 100% of the submerged weight of the PCM contributes to axial friction. PCMs have been applied successfully to one deepwater project, but performance data showing the influence of soil type, and allowing a general design framework to be established, has not yet been available. This paper addresses this gap by investigating the performance of PCMs through three series of centrifuge tests, supported by three Operators. Each series comprises tests on a different reconstituted deepwater soil as follows: (a) West African clay; (b) Gulf of Mexico clay; and (c) carbonate silty sand. In each test, a scaled pipeline is installed in-flight and cycled axially to represent its prior operating life. Scaled PCM models and ballast units are then installed onto the pipe in-flight, mimicking the use of PCMs to mitigate pipeline walking during operation. After installation of the PCMs, further axial cycles are applied, with the system settlement and changes in axial resistance and excess pore pressure measured. The paper shows the performance and applicability of PCMs for a range of soil types, highlighting variations in axial resistance and settlement. The suite of results will help to calibrate design tools for industry, removing unnecessary conservatism and enabling an optimised pipeline anchoring solution to be designed. Key results are equivalent friction factors for the combined pipe-PCM system and PCM settlement, which both show behaviour dependent on soil type. In the clay soils, friction increases significantly over time due to ‘consolidation hardening’. This provides validation of an important effect that has only recently been recognised in pipeline design. In contrast, hardening behavior is not evident in silty sand – although the study suggests there is potential for increasing resistance associated with settlement, which appears to mobilize additional (wedging) stress around the pipeline. Upon PCM installation, the pipelines embed further due to the added weight. Additional settlement occurs during cycling of the system, due to immediate soil deformation and consolidation-related compression. The magnitude of embedment is greater for the clay soils, but in all cases does not cause the clamping action to release. Overall, the efficiency of the PCM system in providing a high level of anchoring force per unit weight placed on the seabed is confirmed. Long term anchoring forces in the range 50-100% of the submerged weight of the PCM are demonstrated. This is several times more efficient than the commonly used alternative of a rock berm.
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Schönnenbeck, G. "A Few Aspects on Lubricant Selection for Stepless Chain Coverters: Efficiency and Service Life." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0079.

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Abstract Stepless vehicle drives will assume their place next to automatic switching units throughout the world if they meet their expected fuel-saving potential. This necessitates optimizing the individual components of the CVT as regards their efficiency. The main source of losses are the hydraulic supply units and the losses which result specifically from non-positive transmission. In the case of stepless chain conveners, these result mainly from friction disk deformation. These losses account for 50 to 70 % of total CVT losses. Both loss components are influenced by the lubricant to a significantly greater extent than it would appear at first sight: In the case of fully-hydraulic clamping and control systems, the viscosity and its long-term stability determines the degree of leakage losses and therefore the size of the pump or pump combinations. This applies to pressure levels between 20 and 40 bar. This in turn is directly proportional to the hydraulic losses on the CVT. The friction coefficient of the lubricant determines the level of the necessary clamping forces. These are responsible for friction-disk deformation. Also of importance as far as the selection of lubricant is concerned is its influence on the CVT service life. The critical service life limits for chain converters are chain breakage (not the subject of this report) and evidence of wear, i.e. grey staining, sheave-grooving, pitting, scoring and rocker pin wear. Standardized test methods exist at P.I.V. for both wear manifestations and for the friction coefficient, these tests allowing a targeted selection of lubricants.
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Ma, W., Z. Lei, and Y. Rong. "FIX-DES: A Computer-Aided Modular Fixture Configuration Design System." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/cie-4281.

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Abstract This paper presents a computer-aided modular fixture design system: FIX-DES. When fixturing requirements are specified as locating/clamping surfaces and points, a fixture configuration will be automatically generated by (1) selecting fixture elements from a fixture element database to form fixture units based on fixture element assembly relationships and (2) placing the fixture units and elements into position on a baseplate while the fixturing requirements and assembly relationships (e.g., hole alignment) are maintained. The fixture element assembly relationships can be automatically established when the geometric models and fixturing functions of the fixture elements are specified so that the FIX-DES system can be easily applied to different fixture systems. The system also provides the interactive design and design modification functions for human expert involvement. The system was developed with core programs in C/C++ and interface programs in a specific CAD environment. The system has been successfully applied in industry and can be easily transferred to other CAD systems. The overall structure of the FIX-DES system is introduced in the paper. The development of the automated fixture configuration design (AFCD) functions are presented in detail. Finally a fixture configura-tion design example is given to illustrate the application of the system.
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Jiao, Zhiwei, Haichao Liu, Pengcheng Xie, and Weimin Yang. "Clamping characteristics study on different types of clamping unit." In PROCEEDINGS OF PPS-30: The 30th International Conference of the Polymer Processing Society – Conference Papers. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4918484.

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Ambrogio, G., L. De Napoli, L. Filice, and M. Muzzupappa. "Improvement Geometrical Precision in Sheet Incremental Forming Processes." In ASME 7th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2004. http://dx.doi.org/10.1115/esda2004-58589.

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Incremental forming is nowadays increasing its presence in industry as a new but interesting process, especially for production of small batches or unique components. Anyway, relevant efforts have to be spent in order to reduce the typical incremental forming processes drawbacks that risk to belittle the high advantages in terms of costs and simplicity. In fact, the process duration, usually equal to several minutes even if the operations are carried out on high speed numerical controlled units, and a certain tendency to produce no precise parts, can reduce industrial interest about incremental forming. A possible strategy to reduce the latter item is the design of modified trajectories able to take into account both the springback effects and the stiffness reduction due to the particular clamping equipment. In this paper the above introduced strategy is pursued integrating an on-line measuring system, based on a digital inspector, and a CNC open program. The actual geometry is acquired in some remarkable points and a compensation routine modifies the coordinates of the future punch path. The modification policy has been developed by using an effective FE code. An experimental verification shows the good potentiality of the suggested methodology.
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Lindau, Björn, Kristina Wärmefjord, Lars Lindkvist, and Rikard Söderberg. "Aspects of Fixture Clamp Modeling in Non-Rigid Variation Simulation of Sheet Metal Assemblies." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63622.

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Today there is an increased use of CAT-tools (Computer Aided Tolerancing) within the automotive industry. These kinds of virtual tools are getting increasingly important to ensure robust solutions as early as possible in the development processes, to minimize the use of test series and thereby reduce lead times and development costs. This paper focuses upon modeling of fixture locating scheme and the aspect of how many degrees of freedoms (DoF) a clamp actually locks. The clamps control part movement allowance, and it is of importance to investigate the influence from the friction forces between the clamping units and the fixated parts. Simulated forces in non-steering directions are compared to friction forces measured in real body shop production equipment. The non-rigid variation simulations have been performed based upon the Method of Influence Coefficients (MIC) and additional functionality for contact modeling, force estimation and weld sequence analysis. There are a variety of alternatives of how to build the simulation model and the made choices obviously influence the simulation results. The industrial case study shows significant differences in both estimated in-plane forces and geometric results after springback for different choices of modeling alternatives. It demonstrates the difficulties in taking the friction force into consideration in variation simulation of sheet metal assembly processes.
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Suwala, Agata, Patrick Land, Karol Janik, and Richard Kasler. "Restricted Access ‘C’ Clamping Smart Drilling Unit." In AeroTech Americas. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-01-1334.

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Sakuma, Shinya, Noriaki Hasegawa, Yuichi Murozaki, and Fumihito Arai. "Force measurement using quartz crystal resonator integrated with sample clamping unit." In 2017 IEEE International Conference on Cyborg and Bionic Systems (CBS). IEEE, 2017. http://dx.doi.org/10.1109/cbs.2017.8266098.

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Jiao, Zhiwei, Weimin Yang, Pengcheng Xie, and Xingtian Wang. "The movement performance of clamping unit in the internal circulation two-platen injection molding machine." In 2010 International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2010. http://dx.doi.org/10.1109/mace.2010.5535286.

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Walsh, William, Sandeep Abotula, and Bharath Konda. "Ring Expansion Testing Innovations: Hydraulic Clamping and Strain Measurement Methods." In 2020 13th International Pipeline Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ipc2020-9407.

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Abstract:
Abstract Ring expansion testing is one of the three accepted methods in API 5L for the measurement of yield strength for line pipe. The other two are flattened-strap tensile testing and round-bar tensile testing. A novel-concept ring expansion test machine has recently been commissioned which uses hydraulic pressure to clamp the top and bottom pressure-reacting plates rather than a traditional bolting arrangement. The benefit of hydraulic clamping is vastly reduced set-up times. This paper describes the design approach and the pitfalls that were overcome in commissioning the ring expansion test unit. Expansion measurements are taken using two different methods: a chain extensometer and an LVDT with a band wrapping the circumference of the pipe. Both approaches are used simultaneously to generate and compare two stress-strain curves for one pressure test. In addition, a 3-Point contact approach is developed to determine the hoop strain during pipe expansion. The 3-point contact approach is an attempt to infer the full hoop expansion behavior by measuring the radius change over a segment of the circumference. The device has two rollers which contact the pipe surface while a dial indicator midway between measures the radius change. As the pipe expands, the rollers maintain contact with the pipe surface while the dial indicator records the change in radius. Tests are performed on HFI, SAWL, and SAWH pipes ranging in outer diameter from 20-inch (508 mm) to 48-inch (1219 mm) and wall thicknesses from 0.375-inch (9.5 mm) to 0.969-inch (24.4 mm). The differences in the stress-strain behavior of these pipe forms are described and related to the residual-stress profiles generated by their respective manufacturing operations. The comparison to flattened-strap and round-bar tensile results are presented in a companion paper. The results of the 3-Point contact approach show that the radius change during early stages of expansion are not uniform around the pipe circumference and different patterns are observed in the HFI, SAWL, and SAWH pipe forms.
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