Journal articles: 'Clamping jaw'

1

Oravcova, Jarmila. "The Methodical Procedure for Designing of Clamping Jaws." Applied Mechanics and Materials 693 (December 2014): 44–49. http://dx.doi.org/10.4028/www.scientific.net/amm.693.44.

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The paper deals with the clamping fixture jaws procedure design. The clamping jaw design methodology developed summarizes complex factors. These factors affect the clamping jaws design for the workpiece. Methodical design procedure consists of three stages. Namely, there are input date summary, clamping fixture design and the last design verification. The ANSYS simulation was used for the verification developing methodology. The components model simulation aim has been studied impact of clamping force position change to the cutting force reactions change. Research was conducted with different positions of jaws.

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Ding, Wen Hua, Hua Deng, Yi Zhang, and Yao Qing Ren. "Optimum Design of the Jaw Clamping Mechanism of Forging Manipulators Based on Force Transmissibility." Applied Mechanics and Materials 157-158 (February 2012): 737–42. http://dx.doi.org/10.4028/www.scientific.net/amm.157-158.737.

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In this paper, the jaw clamping mechanism of a forging manipulator is regarded as a slider-crank mechanism. First, the force Jacobian matrix of the mechanism is obtained according to the dual relationship of velocity Jacobian matrix and force Jacobian matrix. Then, the performance atlases of the global force transmission index and the input space index that represents the motion range of the jaw are drawn with different inputs for the mechanisms of the nondimensional parameters. Furthermore, we research the effect of these structure parameters of the mechanism on the gripping force transmission and input space, and find an optimal range in the force transmission atlas. Finally, we synthesize a detail optimal flowchart of the jaw clamping mechanism of forging manipulators based on force transmissibility. A jaw clamping mechanism of a forging manipulator is studied as an example, and results show that the method presented in this paper is effective for finding an optimal gripper mechanism. The research in this paper can be served as fundamentals of design and optimization of the jaw clamping mechanism of forging manipulators.

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Görög, Augustín, and Ingrid Görögová. "Research of the Influence of Clamping Forces on the Roundness Deviations of the Pipes Turned Surface." Research Papers Faculty of Materials Science and Technology Slovak University of Technology 26, no. 42 (June 1, 2018): 47–54. http://dx.doi.org/10.2478/rput-2018-0005.

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Abstract In practice, pipe products are often produced. The surfaces of these components are often turned. The three-jaw chuck is often used to clamp the components for turning. It is a universal clamping fixture. The main advantage of three-jaw chuck is its high flexibility. However, its disadvantage is the inappropriate influence of the clamping forces on the geometrical accuracy of the produced components. This article deals with research of the influence of clamping forces on the roundness of turned pipes. A universal three-jaw chuck was used. The chuck was tightened using a torque wrench. The applied tighten torques were determined by monitoring the commonly used torques for a manually tightened chuck. The article presents the results of experimental research.

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Rezvani, Sina, Chang-Ju Kim, Simon S. Park, and Jihyun Lee. "Simultaneous Clamping and Cutting Force Measurements with Built-In Sensors." Sensors 20, no. 13 (July 3, 2020): 3736. http://dx.doi.org/10.3390/s20133736.

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The intensity of the clamping force during milling operations is very important, because an excessive clamping force can distort the workpiece, while inadequate clamping causes slippage of the workpiece. Since the overall clamping force can be affected by the cutting forces throughout machining, it is necessary to monitor the change of clamping and the cutting forces during the process. This paper proposes a hybrid system in the form of a vise with built-in strain gauges and in-house-developed piezoelectric sensors for simultaneous measurement of clamping and cutting forces. Lead zirconate titanate (PZT) sensors are fabricated and embedded in a layered jaw to measure the dynamic forces of the machine tool. A cross-shaped groove within the jaw is designed to embed strain gauges, which predominantly measure the static clamping forces. Sensor fusion technology combining the signals of the strain gauges and PZT piezoelectric sensors is used to investigate the interactions between cutting forces and clamping forces. The results show average errors of 11%, 17%, and 6% for milling forces in X, Y, and Z directions, respectively; and 19% error for clamping forces, confirming the capability of the setup to monitor the forces in milling.

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Han, Geun Jo, Seong Wook Lee, and Dong Seop Han. "A Study on the Relationship between Clamping Angle of a Locker and Initial Clamping Force in the Wedge Type Rail Clamp for a Container Crane." Key Engineering Materials 326-328 (December 2006): 1649–52. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.1649.

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The rail clamp is the device to prevent that a container crane slips along rails due to the wind blast as well as to locate the crane in the set position through loading and unloading containers on a vessel in the quay. In order to design the rail clamp, we need to determine the proper wedge angle to minimize the sliding distance of a roller and the proper clamping angle of a locker to generate the initial clamping force of a jaw pad. The researches for the proper wedge angle have conducted. So in this study we look into the relationship between the clamping angle of a locker and the initial clamping force in the rail clamp with wedge angle of 10. The initial clamping force of the jaw pad was determined by the clamping angle of the locker. Therefore after we measured the locking force of a locker and the tensile stress of extension bar with respect to the clamping angle of a locker, such as 2.18, 3.05, 3.92, 4.80, we compared the results with the FEA results.

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Symons, Digby D., Jialiang Chen, and Padraig Alton. "Calculation of optimal jaw geometry for an electronic bond pull test." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 11 (November 13, 2013): 1847–58. http://dx.doi.org/10.1177/0954406213511963.

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A bond pull test is used to determine the strength of the bond of an electronic interconnect to a circuit board. A standard test consists of clamping and pulling the interconnect with a pair of microscopic jaws. In a successful test, the maximum pulling force registered by the jaws will be the failure load of the interconnect to circuit board bond. However, if the interconnect itself deforms before the bond has failed, then this would constitute an unsuccessful test. This paper reports on a theoretical analysis of the optimal geometry for gripping of a cylindrical interconnect. Upper and lower-bound plasticity models have been used to determine the jaw proportions that will maximize the load for the deformation of the interconnect and that should, therefore, be most likely to allow successful measurement of the bond strength. This theoretical analysis is compared to 2D and 3D non-linear finite element calculations. The 2D finite element models are axi-symmetric approximations of a pull test on a cylindrical interconnect. 3D finite element models take into account the actual jaw geometry and allow simulation of both clamping and pulling stages. The maximum calculated pull forces for both 2D and 3D simulations are in good agreement with the plasticity theory. Preliminary validation of the theory and finite element results has been accomplished through experimental clamping and pulling tests on cylindrical metal rods.

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Rothaupt, B., and J. Fleischer. "Sensorische Spannbacke für die Drehbearbeitung*/Sensory clamping jaw for turning operations. Topology optimization as an enabler for clamping force measurement with integrated evaluation electronics." wt Werkstattstechnik online 109, no. 07-08 (2019): 594–97. http://dx.doi.org/10.37544/1436-4980-2019-07-08-84.

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Für ein sicheres und deformationsarmes Spannen dünnwandiger Bauteile in der Drehbearbeitung existiert keine Lösung, welche Kraftmessung, Datenübertragung und Energieversorgung in eine Spannbacke unter Berücksichtigung der Nachrüstbarkeit im industriellen Umfeld integriert. Im Beitrag wird der Forschungsdemonstrator einer topologieoptimierten Monoblock-Spannbacke vorgestellt, welche eine werkstücknahe Spannkraftmessung mit integrierter Energieversorgung und Datenübertragung ermöglicht.   For a safe but low deforming clamping of thin walled parts in turning processes there is no solution integrating all force measurement, data transmission and energy supply in a jaw applicable in an industrial environment. In this paper, a new approach with a topology optimized monobloc clamping jaw is presented, enabling a clamping force measurement near the work piece.

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Bučányová, Marcela, Erika Hrušková, and Martina Kusá. "Design of shape and dimensions of exchangeable jaws for pneumatics chuck of CNC lathe EMCO Concept TURN 105." MATEC Web of Conferences 299 (2019): 03010. http://dx.doi.org/10.1051/matecconf/201929903010.

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The EMCO Concept Turn 105 CNC lathe is part of the iCIM3000 production system. Currently, only a narrow range of products is processed, which is caused by the small clamping range of the 3-jaw pneumatic chuck marked KFD 85/3. Based on the requirement to expand or change the range of manufactured components, new interchangeable jaws will be designed to clamp more diameters despite a small clamping range. The design of the replaceable jaws for the pneumatic chuck is based on the determination of the shapes and dimensions of the components produced on the lathe, as well as on the shape, dimensions and characteristics of the pneumatic chuck.

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Feng, Ping Fa, Ding Wen Yu, Zhi Jun Wu, and E. Uhlmann. "Clamping Behaviour of Modern Jaw-Chuck with Centrifugal Force Compensation during High Speed Turning." Key Engineering Materials 375-376 (March 2008): 636–42. http://dx.doi.org/10.4028/www.scientific.net/kem.375-376.636.

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In order to meet the requirements of high speed turning, modern power operated jaw-chucks with centrifugal force compensation (CFC) were developed by some chuck producers. Based on the force and deformation analysis of the clamping system, a new analytic computation model of dynamic clamping force for modern chuck with CFC was developed, and verified by means of experimental investigations. The clamping behaviours during high speed turning, such as the loss of dynamic clamping force, centrifugal force compensation efficiency and clamping force hysteresis are investigated. Some problems of design and application of modern chuck with CFC are discussed. The study results provide reliable theoretic and technical supports to reasonably utilize the potential of modern chucks at higher rotational speed and guarantee a safe high speed turning process.

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10

Fonger, James D., Xi Ming Yang, Richard A. Cohen, Christian C. Haudenschild, and Richard J. Shemin. "Human mammary artery endothelial sparing with fibrous jaw clamping." Annals of Thoracic Surgery 60, no. 3 (September 1995): 551–55. http://dx.doi.org/10.1016/0003-4975(95)00448-t.

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Meng, Dapeng, Jinsong Du, Xu Yang, Xinye Wang, and Fei Liu. "Design of Vision Guided Intelligent Handing System for Inner Ring and Outer Ring of Railway-bearing." MATEC Web of Conferences 232 (2018): 02008. http://dx.doi.org/10.1051/matecconf/201823202008.

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More and more special automation equipment had been developed with progress of technology. All kinds of nonstandard equipment were applied to the specific occasion. A vision guided intelligent handing system in the paper was specially designed for carrying the inner ring and outer ring of railway-bearing from material handcart to the testing line. Robot, visual positioning, pneumatic clamping jaw, servo motor and PLC were integrated into this handing system. The visual system was led to take pictures for the inner and outer rings by robot, and transfer the location data of rings to the PLC, the brain of the whole system. The PLC controlled robot and pneumatic clamping jaw finish the handing process through accurate calculation.

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12

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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13

Spur, G., and C. Stelzer. "Spannkraftsensoren in Dreibackenfuttern / Clamping force sensors in three-jaw chucks." Zeitschrift für wirtschaftlichen Fabrikbetrieb 86, no. 10 (October 1, 1991): 512–16. http://dx.doi.org/10.1515/zwf-1991-861016.

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14

Ma, Ting Hui. "Height Adjustable Machine with Parallel Jaw." Applied Mechanics and Materials 543-547 (March 2014): 146–49. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.146.

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Machine with a parallel jaw as a fixture of a widely used, it is an indispensable tool in the machining of the existing. But the actual processing according to the workpiece size, pad iron with different specifications in the clamping to adjust the height of the processed parts. The height adjustable machine with a parallel jaw improves caused problems and the use of existing in the actual processing is organic with parallel jaw of inconvenience, in order to solve this problem to design a highly available parallel jaw adjustable machine of the utility model patent, can improve the productivity and reliability, so that the operation all great satisfaction. height adjustable device of the machine with parallel jaw are discussed.

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15

Georgiadis, Anthimos, Marvin Eggebrecht, and Thomas Wagner. "Strategies for Correcting the Workpiece Deformation during the Manufacturing at the Milling Process." Key Engineering Materials 613 (May 2014): 446–52. http://dx.doi.org/10.4028/www.scientific.net/kem.613.446.

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In cutting procedures a possible reason for deviations from the predefined dimensions of the workpiece are deformations caused by the clamping. The deviations are usually measured after process using for example a coordinate measuring machine (CMM). It would be very much advantage to detect such deformations in process. Then, it could be possible to avoid, compensate or repair them before finishing. In the present work, four strain gauges have been applied into a four-jaw chuck in order to measure the clamping forces during milling and correlate them with deviations in the dimensions of the workpiece. A correlation between the clamping forces and deviations in the roundness of the workpiece has been verified. These investigations allow for the next step the development of an active clamping system for adaptive corrections during the cutting process.

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Bianchi, Giacomo, Angela Pucci, Marco Matteucci, Egidio Varone, Simone Lorenzo Romano, Vincenzo Lionetti, and Mattia Glauber. "Mechanical Properties and Biological Interaction of Aortic Clamps: Are These All Minimally Invasive?" Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery 8, no. 1 (January 2013): 42–49. http://dx.doi.org/10.1097/imi.0b013e31828d4903.

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Objective Although specifically designed aortic clamps are mainstay of minimally invasive cardiac surgery, so far, no comparative reports about their mechanical properties and interaction with the aortic wall have been reported. In this study, the generated force in the clamps’ jaws and the biological response of the aorta after clamping are evaluated. Methods The jaw force of five commercially available clamps [Geister, Cygnet, Cardiovision (CV) 195.10, CV 195.40, and CV 195.83] was assessed by clamping a 2.2-mm compression load cell with a dedicated computer universal serial bus interface at the proximal, the middle, and the distal site from the fulcrum. Biological response of the aortic wall was assessed in five minipigs (weight, 38–40 kg) that underwent thoracic aorta clamping and leakage point test. Immunohistochemistry and morphometric analysis were carried out for each aortic segment tested. Results Force generation pattern is peculiar of each clamp, being higher in the proximal and the middle portion and lower in the distal part. One clamp (Cygnet) exhibited homogeneous maximal force generation at all three sites. All clamps exhibited peculiar crushing artifacts. A variable degree of endothelial layer disruption occurred in all clamping tests; three clamps (CV 195.10, Cygnet, and Geister) had the lower amount of intact endothelium. The clamping force was not associated with the degree of endothelial disruption (P value was not significant). Conclusions The choice of a clamp that is not only minimally invasive in design but also least traumatic will help avoid complications of aortic manipulation.

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Chemezov, Denis Alexandrovich, Svetlana Ivanovna Tyurina, Tatyana Nikolaevna Komarova, Alexey Mikhailovich Averyanov, Lyubov Alekseevna Suvorova, Oleg Viktorovich Stepanov, and Elena Viktorovna Lezova. "STRESSES IN A STEEL RING AT CLAMPING IN A THREE-JAW CHUCK." Theoretical & Applied Science 72, no. 04 (April 30, 2019): 11–14. http://dx.doi.org/10.15863/tas.2019.04.72.2.

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Wentai, Yu, Sidie Yang, Shunqing Liu, Tao Liu, and Haixia Gong. "The Relationship between the Depth Embedded Pipe Pile and the Force of Clamping Jaw." IOP Conference Series: Materials Science and Engineering 452 (December 12, 2018): 022052. http://dx.doi.org/10.1088/1757-899x/452/2/022052.

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Estrems, M., M. Arizmendi, W. E. Cumbicus, and A. López. "Measurement of Clamping Forces in a 3 Jaw Chuck through an Instrumented Aluminium Ring." Procedia Engineering 132 (2015): 456–63. http://dx.doi.org/10.1016/j.proeng.2015.12.519.

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Feng, P. F., D. W. Yu, Z. J. Wu, and E. Uhlmann. "Jaw-chuck stiffness and its influence on dynamic clamping force during high-speed turning." International Journal of Machine Tools and Manufacture 48, no. 11 (September 2008): 1268–75. http://dx.doi.org/10.1016/j.ijmachtools.2008.03.002.

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Fedoskina, Olena, Valerii Fedoskin, and Anastasiia Loginova. "The issue of loading the material in a vibro-impact grinder." E3S Web of Conferences 109 (2019): 00024. http://dx.doi.org/10.1051/e3sconf/201910900024.

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The article discusses the basic principles of force loading of a material in a vibro-impact grinder with a vertical and inclined working chamber. It is shown that in a grinder with a vertical working chamber the control of the material loading is limited by the presence of a relationship between the vertical and rotational oscillations of the jaws. Vibro-impact grinder with an inclined working chamber represents a new class of machines. A mathematical model of the process of interaction of the jaw with a piece of material when moving it in the working chamber is presented. Equations and graphical dependencies are obtained, which determine the phase angle of the moment of clamping the piece in the working chamber. The modes of power loading of the material in the working chamber were analyzed.

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Min, Byung-Moo, Seung-Young Kim, and Jun-Mook Yang. "A Muscle-Clamping System With an Absorbable Jaw Clip to Reduce Suturing in Strabismus Surgery." Ophthalmic Surgery, Lasers and Imaging Retina 29, no. 2 (February 1998): 162–66. http://dx.doi.org/10.3928/1542-8877-19980201-14.

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Deguchi, Tomoaki, Yoshifumi Ikeda, Masanori Niimi, Ryoji Fukushima, and Masaki Kitajima. "Continuous Intraoperative Neuromonitoring Study Using Pigs for the Prevention of Mechanical Recurrent Laryngeal Nerve Injury in Esophageal Surgery." Surgical Innovation 24, no. 2 (January 31, 2017): 115–21. http://dx.doi.org/10.1177/1553350617690304.

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Purposes. During esophageal surgery, clamping injury and injury associated with the use of energy devices are common mechanisms underlying intraoperative recurrent laryngeal nerve (RLN) damage. Recently, intraoperative neuromonitoring (IONM) has been applied to prevent RLN injury. This study was aimed at investigating the changes in the EMG signals associated with clamping injury of the RLN caused by picking up of the nerve with tweezers in domestic pigs. Methods. Six domestic pigs (12 RLNs) underwent continuous IONM (CIONM) by our original automated periodic vagal nerve stimulation method. Results. Our system can be used safely and accurately. The signals showed a decrease of the amplitude when the RLN was picked up and closed slowly by the double-action Maryland with jaw covers. If the clamp was released before the signal amplitude decreased to 50% of the baseline, the signal showed gradual recovery to the baseline in 12 ± 3 minutes. Conclusion. Although there were limitations in our study using domestic pig, including the small sample size, our results are expected to contribute to a decrease in the incidence of RLN damage during esophageal surgery.

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Frank, T., G. J. Willetts, F. Carter, and A. Cuschieri. "Clamping the Small Intestine During Surgery: Predicted and Measured Sealing Forces." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 209, no. 2 (June 1995): 111–15. http://dx.doi.org/10.1243/pime_proc_1995_209_327_02.

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During bowel surgery it is often necessary to occlude the bowel using clamps. Occlusion occurs in two stages: approximation of bowel internal surfaces followed by sealing which is necessary to prevent seepage. The occlusive force at both stages depends on the luminal pressure, the latter stage requiring greater force than the former. The difference in luminal pressure across the sealing line results in a slipping force which is resisted by friction between the bowel and the clamp jaw surfaces. A theoretical model was developed to describe these forces and the predicted values obtained from this model were compared with direct measurements carried out on porcine bowel samples in a test rig. It was found that the measured approximation force was between 25 and 50 per cent of the maximum theoretical values and that sealing without seepage requires a clamp force of about ten times the approximation force. Using these results and known intraluminal pressures in the human gastrointestinal tract, a bowel clamp must apply around 7 N to prevent seepage and the coefficient of friction between clamp and bowel should be between 0.6 and 0.9.

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Kopetskii, A. A., V. A. Nosenko, and V. N. Tyshkevich. "Influence of the shift of clamping forces on elastic deformations of the bearing ring in a jaw gripper." Journal of Machinery Manufacture and Reliability 43, no. 1 (January 2014): 55–59. http://dx.doi.org/10.3103/s1052618814010099.

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McGreevy, Paul, Amanda Warren-Smith, and Yann Guisard. "The effect of double bridles and jaw-clamping crank nosebands on temperature of eyes and facial skin of horses." Journal of Veterinary Behavior 7, no. 3 (May 2012): 142–48. http://dx.doi.org/10.1016/j.jveb.2011.08.001.

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Han, Qi Gang, Ming Zhe Li, Qiang Zhang, Ya Dong Chen, and Wen Zhi Fu. "Design of a New Type Flexible Stretch-Forming Machine." Advanced Materials Research 690-693 (May 2013): 2218–21. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.2218.

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Stretch forming machine (SFM) is most effective plastic forming equipment for large-size, thin and flat-deformation parts, which can decrease the springback phenomenon in sheet metal forming. In order to enhance the performance of SFM, a flexible stretch forming machine (FSFM) was developed by the authors successfully, which is made up of jaw clamping mechanisms, stretching mechanisms, universal push-pull mechanisms, and a carriage. Our experimental results indicated that the rate of materials utilization and close-fitting dies can be increased to 80 %. In addition, FSFM can reduce the complex of control-system and decrease the expense of machine sharply. FSFM have been used for double-curved sheet metal manufacturing successfully, such as the cab of high-speed train. This work has a strong value in enhance the stretch forming technology for double-curved sheet metal parts.

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Legkiy, N. M. "Reducing the effect of centrifugal forces on the clamping force in the new design of a three-jaw lathe chuck." IOP Conference Series: Materials Science and Engineering 971 (December 1, 2020): 022076. http://dx.doi.org/10.1088/1757-899x/971/2/022076.

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Hsieh, Ming-Chu, and Zhen-Hong Khong. "Design and analysis for manipulator fixture applications." MATEC Web of Conferences 185 (2018): 00031. http://dx.doi.org/10.1051/matecconf/201818500031.

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The manipulators arms are the most important components in automatic machinery and equipment. These arms must conform to product requirements and match important accessory devices such as clamping jaw so that the entire process operates properly. Therefore the most important issue is that the manipulator arm has only one clamping jaw, followed by other issues such as welding and related features. In this research the manipulator arm of automated machinery with attached equipment was optimized, and the design serves as an object of study for multifunctional applications. This research emphasizes on customized manipulator design to create products with distinguished styles and characteristics, and serve as a basis for an improvement on innovative design. Manipulator arms from different manufacturers with various head-disc size and screw-hole locations were investigated, and concept of human palm was incorporated in the design to create a mechanical fixture that can be fitted into the arm. Overall design including main body of the manipulator, pneumatic cylinder set, gear and connecting rod combination, planet gear set, and linkage rods and fixture. These components were combined to offer the functions of the manipulator. Commercial software package, SolidWorks, was used to construct the model for the manipulator arm, and CAE analysis was implemented to identify the stress on the structure and possible interferences of the mobile components. Stress analysis was also performed on the gear set under pneumatic loading to ensure that the gear mechanism has a sufficient strength. The results of this study showed that an arc shaped manipulator body is the most easily handled during installation and most effectively controlled during operation. The simple profiles of the manipulator also lower the space required for storage. The design of the gear set and integrated application of the shaft helps prevent loosening of gear and shaft during operation. In this study, a manipulator was designed with three different functions, each fixture is powered by an isolated pneumatic cylinder, and this mechanism can be manipulated to form o0to o180clamping action in accordance with requirements of the task. The methods and results of this study serve as a reference for machinery industry to achieve high quality product, and also as a basis for innovative design.

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Zhou, Yan, Hu Zhang, and Huan Qiang. "The Design of the Fixture for the Thin Wall Cone Parts." Applied Mechanics and Materials 599-601 (August 2014): 489–92. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.489.

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When turning and grinding the long axis with cone thin-walled, they are clamped to be deformation easily and positioned difficultly. Based on the existing theory of clamping with the conical sleeve, we design a new type of fixture in this paper. The outer cone of the fixture cling to the inner cone of the workpiece, it is sealed hermetically at the both ends. The head of the sleeve stretch out of a cylindrical boss, we can use the three-jaw chuck to position it on the machine tool. Also we use the steady rest to fix the end of the sleeve. The steady rest connect with the shell of a rotary joint. The end of the rotary joint screw with the sleeve, the other end of it is connected with a getter pump. It formatted a vacuum between the sleeve and the workpiece by the use of holes around the circumference of the sleeve. The utility model to the fixture used for thin wall conical parts with long shaft.

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Pozhbelko, V. I., and E. N. Kuts. "Integer Structural Synthesis of Multiloop Lever Mechanisms with Multiple Joints for Different Areas of Mechanical Engineering." Proceedings of Higher Educational Institutions. Маchine Building, no. 6 (735) (June 2021): 23–36. http://dx.doi.org/10.18698/0536-1044-2021-6-23-36.

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The article considers the problem of structural synthesis of various lever mechanisms with multiple joints. Structural synthesis of multi-link mechanisms, on the one hand, is the primary and most difficult, due to the large number of options for structural solutions and, on the other hand, it is the most important design stage. To solve the problem under study, a theorem of integer structural synthesis of multi-loop kinematic chains with multiple joints is proposed. On the basis of the theorem the entire finite sets of structural solutions for directed synthesis are determined at the level of inventions of various working multi-loop lever mechanisms with multiple joints of different multiplicity. An algorithm for the structural synthesis of multi-loop lever mechanisms of a given mobility with a variety of multiple joints is proposed. The effectiveness of the proposed algorithm is confirmed by examples of its application for an integer structural synthesis of a manipulator gripper, a jaw crusher, a rectilinear-guiding articulated lifting mechanism of the manipulator and a universal multi-point articulated clamping device, as well as by the results of experimental studies of their operating models.

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Shin, Dong Hwan, Tae Sang Park, Choong Pyo Jeong, Yoon Gu Kim, and Ji Nung An. "Study of Torsion Spring’s Parameters with Angular Type Grippers." Advanced Materials Research 502 (April 2012): 355–59. http://dx.doi.org/10.4028/www.scientific.net/amr.502.355.

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Angular type grippers are proper to grip the small size material than linear type grippers (clamping). It is due to the grip force of angular type grippers separates to the normal and the opposite directional force to gravity forces, when the contact between the gripper tip and the gripped material occurs. Whereas, the linear type gripper with prismatic joint has only normal forces. Therefore, even less gripping force of angular type grippers than linear type can generate slip-less pick-and-place motions. But this angular type gripper has some restrictions. For generating the opposite direction force to gravity forces, it is necessary that the length between each angular joint position is larger than the length of gripped materials. This should be considered on the design step of angular type grippers. Otherwise, the gripping force separates to the normal and the same directional force to gravity forces. The other restriction is that the tip of gripper must have passive joint or active joint for the plane-to-plane contact between faces of gripped material and gripper tip, for getting the high frictional coefficient. In this paper, we describe the case of adaptation of passive joint. This leads simpler implementation than the active joint. Especially, we focus on the torsional spring deposed at between jaw link and tip as the passive joint, with effects of design parameters of this torsional spring such as the torsional stiffness and preload with multi-body dynamics simulation.

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33

Afandiyev, Emin Musa, and Mahammadali Nuraddin Nuriyev. "Analysis of reliability of the drill pipe in the clamping mechanism." EUREKA: Physics and Engineering, no. 5 (September 13, 2021): 80–87. http://dx.doi.org/10.21303/2461-4262.2021.001765.

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In oilfield equipment, a significant place is occupied by clamping mechanisms used to grip pipes during tripping operations. They are mainly divided into 2 groups. The first includes mechanisms with a forced clamping of the part. The second group includes self-clamping devices with a wedge mechanism. Here, the clamping force increases in proportion to the axial shear force. In these clamping devices, clamping jaws serve as a common element. In addition to smooth jaws, there may be jaws with notches on the inner cylindrical surface. Such notches contribute to an increase in the coefficient of adhesion when clamping cylindrical parts, in particular pipes. During the operation of clamping devices with corrugated jaws, the teeth of the notch are introduced into the pipe walls under the action of the clamping force. The shearing force can then displace the pipe relative to the jaws. The adhesion coefficient µ is the ratio of the shear force P to the clamping force Q, i.e. P/Q. Exceeding the shear force P of the limit value causes the pipe to be clamped to move. The correct choice of the place of load application is also of great importance. Optimum clamping performance can be achieved by clamping workpieces without slipping from shear forces. At the same time, it is necessary to ensure reliability, efficiency, productivity. Therefore, all factors that determine the holding capacity of clamping mechanisms should be considered. These factors include the coefficient of adhesion, the design of the working surfaces of the clamping elements, the type of notch of the corrugated jaws and the place of application of the clamping force

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Zhou, Xu, Yu Rong Chen, and Zhen Wang. "Contact between Prefabricated Pile and Pile Clamping Jaws under Pile Driving." Applied Mechanics and Materials 101-102 (September 2011): 85–91. http://dx.doi.org/10.4028/www.scientific.net/amm.101-102.85.

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Pile clamping mechanism with hydraulic static pile driver has advantages of convenient for the design, improvement and use. The maximum transmission pile driving force of pile clamping mechanism of hydraulic static pile driver was analyzed. The static forces of pile clamping mechanism and prefabricated pile were researched and analyzed. The contact between prefabricated pile and pile clamping jaws under pile driving was investigated. It was revealed that when the force of pile clamping cylinder is small, the contact between prefabricated pile and pile clamping jaws under pile driving can be considered that between the elastic inner cylindrical surface and the axis parallel elastic outer cylindrical surface. When the force of pile clamping cylinder is large, the prefabricated pile contacted with pile clamping jaws under pile driving can be considered the hollow thick-wall cylinder subjected to uniformly distributed external pressure.

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35

Boldt, Torsten, and Hubertus Murrenhoff. "Power-by-Wire Clamping System with Continuously Adjustable Clamping Jaws." IFAC Proceedings Volumes 33, no. 26 (September 2000): 247–52. http://dx.doi.org/10.1016/s1474-6670(17)39152-8.

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FARKOUSH, SIAMAK HAJIZADEH, NABIOLLAH ABOLFATHI, HORMOZ MEHMANESH, and SIAMAK NAJARIAN. "DESIGN, FABRICATION, AND TEST OF A NOVEL CLAMPER FOR AORTIC CROSS-CLAMPING IN MINIMALLY INVASIVE CARDIAC SURGERY." Journal of Mechanics in Medicine and Biology 16, no. 05 (August 2016): 1650066. http://dx.doi.org/10.1142/s0219519416500664.

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One of the main procedures in the most minimally invasive cardiothoracic surgery is clamping the ascending aorta to disconnect the heart from circulation. In this paper, a new aortic clamping instrument which is applicable in minimally invasive cardiac surgery has been presented. The instrument consists of a parallelogram mechanism for opening and closing the jaws, a detachable holder with a two degree of freedom joint that makes the precise position and orientation of the jaws and leaves the clamping component in the patient’s body to make the inserting port free, and a handle for easy manipulation. In vitro test has been performed to evaluate the performance of the clamper compared to the conventional clampers. For this purpose, the force required for aortic cross-clamping and the maximum aortic displacement have been studied in four groups including parallel clamper and conventional clamper with angles of 1[Formula: see text], 2[Formula: see text], and 3[Formula: see text] between jaws, with 10 bovine aorta specimens in each group. These experiments show that the amount of required force for cross-clamping by using the parallel clamper, is statistically significant ([Formula: see text]) compared with the conventional clampers. Also, the increase of angle between jaws makes a significant increase in the percentage of aortic displacement.

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Song, Zhi Dong. "The Design of the New-Type Vice Wrench for Machine." Advanced Materials Research 971-973 (June 2014): 793–97. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.793.

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Parallel jaws are widely used in machine tools for clamping. Vice wrenches are necessary for loading and unloading workpieces. However, it is inconvenient to use current vice wrenches. In order to improve the flexibility and convenience of vice wrenches and improve the efficiency of mechanical clamping, a new-type vice wrench is designed.

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Hatze, Herbert. "The Relationship between the Coefficient of Restitution and Energy Losses in Tennis Rackets." Journal of Applied Biomechanics 9, no. 2 (May 1993): 124–42. http://dx.doi.org/10.1123/jab.9.2.124.

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The relationship is investigated between the apparent coefficient of restitution and the losses in preimpact kinetic energy of the ball for tennis rackets whose handles are constrained by various clamping modes. The complete energy balance equation of the racket-ball system is derived, and experimental results involving four test rackets are then used to evaluate the various components of the total energy loss for the standardized hand-held mode and the vice-clamping mode. Results demonstrate that the apparent coefficient of restitution is not, as previously thought, independent of the clamping mode but varies significantly with the constraining condition applied to the handle, and with the preimpact velocity of the ball. The relative energy losses in the strings are comparatively small, whereas the losses in the ball increase exponentially with the magnitude of the impulse. The major part of the total loss in kinetic energy of the impacting ball is due to the spatial postimpact recoil motion and internal vibrations of the racket frame.

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Michalik, Peter, and Vieroslav Molnar. "Test Equipment for Analysis of Samples Rubber – Textile Conveyor Belts by Help Industrial Metrotomographs." Applied Mechanics and Materials 683 (October 2014): 208–12. http://dx.doi.org/10.4028/www.scientific.net/amm.683.208.

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The test equipment of samples for analysis of rubber-textile conveyor belts is a device designed to create tension and tracking the deformation in different cross sections of conveyor belts in one axis X. This construction is designed tensioning device, which allows the development of automatic tensioning force in one axis X-tensioning force F is exerted screw the nut with a torque wrench and a controlled strain-gauge sensor. Measured sample-textile conveyor belt is clamped in two adjustable clamping jaws ribbed belts for different thicknesses. Ribbed clamping jaws on one side of the tensioning device is attached to the frame and on the other hand are attached to the runner associated with the movable tensioning screw.

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Soriano-Heras, Enrique, Higinio Rubio, Alejandro Bustos, and Cristina Castejon. "Mathematical Analysis of the Process Forces Effect on Collet Chuck Holders." Mathematics 9, no. 5 (February 27, 2021): 492. http://dx.doi.org/10.3390/math9050492.

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Chuck holders are widely used for jobs with high precision. A chuck holder consists of a nut with a tapered surface and a thin-slotted clamping sleeve typically made of hardened steel and named a collet. Chuck holders are, essentially, wedge mechanisms. In this paper, we investigated the reactions and strains due to the forces during the chip removal process in the contact elements or jaws of the collet by means of mathematical analysis. Deflections in the jaws of the collet arise with a high influence from the precision of the workpieces. The cutting or process forces cause an axial force, a radial force, a torsional moment, and a bending moment on the chuck collet, and, consequently, displacements and inclinations of the clamping system are caused. Therefore, the proposed analytical models are based on elasticity and contact theories. The mathematical model for determining the deflections of the clamping system force was developed and implemented using MATLAB. The results showed that the variation in the clamping force during rotation in a collet chuck holder mainly depends on the stiffness of the collet chuck holder and the stiffness of the workpiece. The results indicated that the collet should be vulcanized to minimize the deformations that affect the final product. The deflections of a collet chuck holder due to process forces depend strongly on the clearances, wedge angle, and stiffness of the collet.

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Oravcová, Jarmila, and Eva Riečičiarová. "Application of Numerical Simulation for the Verification of Design of Clamping a Workpiece in Jaws." Research Papers Faculty of Materials Science and Technology Slovak University of Technology 24, no. 39 (December 1, 2016): 57–62. http://dx.doi.org/10.1515/rput-2016-0017.

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Abstract This paper deals with the use of the numerical computer oriented method for the analysis and verification of the design of workpiece clamping. The inaccuracies of the positioning in clamping locating points were simulated using the FEM software ANSYS. The influence of inaccuracies in the positions of contact locating points on the displacements of the workpiece characteristic points and their position in clamped removable jaws was examined. The reaction forces in the contact locating points were also computed and analyzed.

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42

Wang, Bing. "High Speed On-Off Valve Self-adapting Clamping System." Journal of Applied Sciences 14, no. 3 (January 15, 2014): 279–84. http://dx.doi.org/10.3923/jas.2014.279.284.

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Michalik, Peter, and Vieroslav Molnar. "The Monitoring and Analysis of Textile Conveyor Belt by Industrial Metrotomographs." Applied Mechanics and Materials 803 (October 2015): 207–14. http://dx.doi.org/10.4028/www.scientific.net/amm.803.207.

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The article deals with a description of new test equipment and methodology of an analysis of textile rubber conveyor belts loaded by a tensile force. This construction is designed tensioning device, which allows the development of automatic tensioning force in one axis X-tensioning force F is exerted screw the nut with a torque wrench and a controlled strain-gauge sensor. Measured sample-textile conveyor belt is clamped in two adjustable clamping jaws ribbed belts for different thicknesses. Ribbed clamping jaws on one side of the tensioning device is attached to the frame and on the other hand are attached to the runner associated with the movable tensioning screw. Presented measurement method arises from existing norms. Sensing sample section of the conveyor belt is carried out on CMMs based CT for parts with different size and density of the material.

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Bučányová, Marcela, Erika Hrušková, Miriam Matúšová, and Martina Kusá. "Estimation of Conditions in Exchangeable Jaws Design of Pneumatics Gripper." Research Papers Faculty of Materials Science and Technology Slovak University of Technology 26, no. 42 (June 1, 2018): 189–95. http://dx.doi.org/10.2478/rput-2018-0023.

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Abstract The paper deals with the design of replaceable jaws on pneumatics gripper of the CNC milling machine EMCO Concept MILL 105, which is part of the iCIM 3000 manufacturing and assembly system. When designing replaceable jaws to allow firm and safe clamping of rotating and non-rotating parts, it was based on limiting factors such as parameters of the pneumatics gripper, dimensions, shape and material of the clamped parts and the like.

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Kalina, Tomáš, and Václav Marek. "Development of the New Generation of Clamping Jaws for Thermomechanical Simulator." Manufacturing Technology 19, no. 6 (December 1, 2019): 973–78. http://dx.doi.org/10.21062/ujep/405.2019/a/1213-2489/mt/19/6/973.

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Kozak, R. V., and D. M. Korol. "MATHEMATICAL SUBSTANTIATION OF THE USE OF DIFFERENT TYPES OF CLAMMERS DURING THE RESTORATION OF THE DENTITION WITH DOUBLE-SIDED DISTAL DEFECTS AND THE DEFECT INCLUDED IN THE FRONTAL AREA BY REMOVABLE PROSTHETICS." Medical and Ecological Problems 23, no. 1-2 (April 12, 2019): 13–16. http://dx.doi.org/10.31718/mep.2019.23.1-2.03.

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The basic conditions that ensure good functional qualities and durability of prosthetic structures from the point of view of biomechanics, undoubtedly include an optimal way of fixing a partial removable prosthesis, which consists in the correct choice of the clamping system that ensures reliable fixation of the prosthesis in the given position and at the same time causing a minimum of harm supporting teeth, as well as the most rational distribution of occlusal loads transmitted to the supporting tissues, since it is these factors that determine the durability functioning dentures. The purpose of biomechanical studies is to analyze the stress-strain state of the supporting teeth of partial removable prostheses replacing the included and terminal defects of the dentition when fixing the prosthesis on the supporting teeth with the help of holding and supporting-retaining clamps. The studies were performed on a model of the mandible with overall dimensions of the cross section corresponding to some average dimensions. The first volumetric finite element model was developed to study the stress-strain state of periodontal ligaments of supporting teeth and supporting gingival tissues when the incomplete and bilaterial end defects of the dentition were replaced (1 class 1 subclass by Kennedy) of the mandible by a removable denture with fixation by retaining clamps on the canines and the first premolars. The second volumetric finite element model is designed to study the stress-strain state of periodontal ligaments of supporting teeth and supporting gum tissues when the included and two-sided end defects of the dentition of the lower jaw are replaced by a removable clasp prosthesis with fixation of support-retaining clamps on canines and first premolars with support arms of clamps from the distal sides of premolars. As a result of the studies performed, the following conclusions can be drawn: In both considered variants fixation of removable clasp prostheses loaded with maximum values of equivalent stresses in the periodontium of the supporting teeth is localized at the apex of the alveolar ridge, which indicates the transfer of the "clutching" supporting teeth of the clasp prosthesis. The maximum values f equivalent stresses in the periodontitis of the supporting teeth during fixation of the removable clasp prosthesis by the support-retaining clamps on the canines and the first premolars exceed the corresponding values of the equivalent stresses for the case of fixing the prosthesis with retention clamps by 30-140%! With an increase in gum compliance, the values of equivalent stresses in the periodontitis of the supporting teeth during fixation of the removable clasp prosthesis by the retaining clasps vary insignificantly within 25%, and an increase in the corresponding equivalent stresses with the use of support-holding clasps may be 65%. In order to ensure the maximum sparing regimen of periodontal tissues of supporting teeth and as a result - the possibility of the most prolonged use of the prosthesis without loosening of the supporting teeth, it seems more expedient to give preference to the use of clasp prostheses with the fixation of the retaining clasps.

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Jia, Kun, Zongwei Fan, and Keji Yang. "3 DOF noncontact clamping stage for micro-stereolithography on embedded material." International Journal of Applied Electromagnetics and Mechanics 52, no. 1-2 (December 29, 2016): 183–90. http://dx.doi.org/10.3233/jae-162096.

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48

Yan, Zhi-Chao, Li-Quan Wang, and Hai-Xia Gong. "Kinematic and Dynamic Analysis of Clamping Manipulator for Drill Pipe Racking System." Journal of Applied Sciences 13, no. 22 (November 1, 2013): 5287–97. http://dx.doi.org/10.3923/jas.2013.5287.5297.

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Wen, C. Y., C. Y. Lee, H. Y. Yu, and H. T. Chang. "A Novel Inflatable Belt-Type Clamp in Open Heart Surgery." Journal of Mechanics 27, no. 1 (March 2011): 57–62. http://dx.doi.org/10.1017/jmech.2011.7.

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ABSTRACTIn this study, a novel inflatable belt-type clamp is introduced and its performance is verified. Finite element simulations are performed to compare the performance of three different aorta clamping systems. In every case, the aorta is modeled as a simple hollow cylinder made of linearly elastic material. For a traditional surgical clamp in which the jaws remain inclined to one another as they close around the aorta, the maximum normal stress within the aorta wall is found to be 806kPa. It is shown that the numerical results are in good qualitative agreement with the experimental results obtained using a pressure sensitive film. The simulation results for a modified clamp in which the jaws remain parallel during the clamping operation show that the maximum normal stress is reduced to 222kPa. However, two regions of maximum stress are induced within the aorta wall. Finally, the numerical results for a novel inflatable belt-type clamp show that the maximum normal stress is equal to approximately 221kPa. In contrast to the modified clamp, the stress is uniformly distributed around the perimeter of the aorta, and thus the risk of aortic dissection is significantly reduced.

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Gasser, Thomas C., Christian A. J. Schulze-Bauer, and Gerhard A. Holzapfel. "A Three-dimensional Finite Element Model for Arterial Clamping." Journal of Biomechanical Engineering 124, no. 4 (July 30, 2002): 355–63. http://dx.doi.org/10.1115/1.1485284.

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Clamp induced injuries of the arterial wall may determine the outcome of surgical procedures. Thus, it is important to investigate the underlying mechanical effects. We present a three-dimensional finite element model, which allows the study of the mechanical response of an artery–treated as a two-layer tube-during arterial clamping. The important residual stresses, which are associated with the load-free configuration of the artery, are also considered. In particular, the finite element analysis of the deformation process of a clamped artery and the associated stress distribution is presented. Within the clamping area a zone of axial tensile peak-stresses was identified, which (may) cause intimal and medial injury. This is an additional injury mechanism, which clearly differs from the commonly assumed wall damage occurring due to compression between the jaws of the clamp. The proposed numerical model provides essential insights into the mechanics of the clamping procedure and the associated injury mechanisms. It allows detailed parameter studies on a virtual clamped artery, which can not be performed with other methodologies. This approach has the potential to identify the most appropriate clamps for certain types of arteries and to guide optimal clamp design.

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Journal articles on the topic 'Clamping jaw'

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