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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Tribologists and Lubrication Engineers
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Journal DOI :
The Korean Society of Tribologists and Lubrication Engineers
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Volume & Issues
Volume 28, Issue 6 - Dec 2012
Volume 28, Issue 5 - Oct 2012
Volume 28, Issue 4 - Aug 2012
Volume 28, Issue 3 - Jun 2012
Volume 28, Issue 2 - Apr 2012
Volume 28, Issue 1 - Feb 2012
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Application Study of Magneto-Rheological Elastomer to Friction Control
Lian, Chenglong ; Lee, Deuk-Won ; Lee, Kwang-Hee ; Lee, Chul-Hee ; Kim, Cheol-Hyun ; Cho, Won-Oh ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 28, issue 3, 2012, Pages 107~111
DOI : 10.9725/kstle.2012.28.3.107
In this study, application feasibility of Magneto-rheological elastomer to friction control is investigated to identify the reciprocating friction and wear performance in applied magnetic field. Friction and wear of MR elastomerare measured by reciprocating tester by controlling the magnetic field. In the case of applied magnetic field, the coefficient of friction increases as both load and velocity increase. For the case of no magnetic field, the value of coefficient of friction hardly changes during the test. The amount of destruction is measured through cross section images of MR elastomer after tests. The depths of destruction are compared for MR elastomer with or without magnetic field. The results show that the depth of destruction of MR elastomer with magnetic field is deeper than without magnetic field. Based on the obtained results, optimal braking and driving performance can be achieved by controlling the coefficient of friction of MR elastomer, which can be applied to various industrial applications such as driving systems of automobiles and robots.
Braking Characteristics of Friction Disk made of Carbon Paper for Wet-type Multiple Disk Brakes of Crane Turning Decelerator
Cho, Yonsang ; Bae, Myongho ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 28, issue 3, 2012, Pages 112~116
DOI : 10.9725/kstle.2012.28.3.112
wet-type multiple disk brakes are very important parts of turning decelerator for deck crane, because they are advanced in durability and braking power, and can be designed compactly. Thus, we designed and made wet-type multiple disk brakes of turning decelerator for deck crane to be localization of these imported all. In this study, wet multiple disk brakes were made a comparative test with the 2 types materials of friction disk by the SAE No.2 dynamometer. The friction characteristics were measured and analyzed to decide a suitable material as wear depth of friction disk and dynamic and static friction coefficient.
Tribological Properties of Hybrid Friction Materials: Combining Low-steel and Non-steel Friction Materials
Kim, JinWoo ; Jang, Ho ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 28, issue 3, 2012, Pages 117~123
DOI : 10.9725/kstle.2012.28.3.117
Tribological properties of hybrid type friction materials were studied. Hybrid friction materials were produced by combining non-steel(NS) and low-steel(LS) type friction materials. The emphasis of the investigation was given to possible synergistic effects from the two different friction materials, in terms of friction stability at high temperatures and the amplitude of friction oscillation, also known as stick-slip at low sliding speeds. The high temperature friction test results showed that the friction effectiveness of the hybrid friction material was well sustained compared to LS and NS friction materials. Wear resistance of the hybrid type was similar to LS friction materials. Examination of the rubbing surfaces after tests revealed that the friction characteristics of the hybrid friction material were attributed to the wear debris produced from low-steel friction materials, which were migrated to the surface of the non-steel friction material, forming new contact plateaus. The stick-slip amplitude and its frequency were pronounced when non-steel friction material was tested, while hybrid and low-steel types showed relatively small stick-slip amplitudes. These results suggest possible improvement of tribological properties by designing a hybrid composite of low-steel and non-steel friction materials.
Measurement of Wear and Friction Coefficients for the Prediction of Fretting Wear
Cho, Yong Joo ; Kim, Tae Wan ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 28, issue 3, 2012, Pages 124~129
DOI : 10.9725/kstle.2012.28.3.124
The prediction of fretting wear is a significant issue for the design of contacting mechanical components such as flexible couplings and splines, jointed structures and so on. In our earlier study, we developed a numerical model to predict the fretting wear using boundary element method. The developed algorithm needs experimental fretting wear coefficients and friction coefficients between two moving materials to get more reliable results. In this study, therefore, we demonstrated the measurement method of the fretting wear coefficients and friction coefficients using disk on plate tribometer with piazo actuator and gap sensor. For four different material combinations, the fretting wear coefficients and friction coefficients are acquired through the fretting wear experiment and the analysis of the measured values. Thess results are useful to predict the quantative fretting wear rate in the developed algorithm.
A Study on Real-time Tool Breakage Monitoring on CNC Lathe using Fusion Sensor
An, Young-Jin ; Kim, Jae-Yeol ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 28, issue 3, 2012, Pages 130~135
DOI : 10.9725/kstle.2012.28.3.130
This study presents a new methodology for realtime tool breakage detection by sensor fusion concept of two hall sensor and an acoustic emission (AE) sensor. Spindle induction motor torque of CNC Lathe during machining is estimated by two hall sensor. Estimated motor torque instead of a tool dynamometer was used to measure the cutting torque and tool breakage detection. A burst of AE signal was used as a triggering signal to inspect the cutting torque. A significant drop of cutting torque was utilized to detect tool breakage. The algorithm was implemented on a NI DAQ (Data Acquisition) board for in-process tool breakage detection. The result of experiment showed an excellent monitoring capability of the proposed tool breakage detection system. This system is available tool breakage monitoring through internet also provides this system's user with current cutting torque of induction motor.
Friction Characteristics of W100×L25 Micro Ellipse Type Pattern
Choi, Won-Sik ; Kwon, Soon-Hong ; Chung, Sung-Won ; Kwon, Soon-Goo ; Park, Jong-Min ; Kim, Jong-Sun ; Park, Dae-Young ; Chae, Young-Hoon ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 28, issue 3, 2012, Pages 136~141
DOI : 10.9725/kstle.2012.28.3.136
In this paper, we investigated the friction characteristics of
ellipse type surface pattern, on bearing steel. These characteristics are researched by utilizing a pin-on-disk wear test machine, under various velocities and other conditions. The reduction of friction is a necessary requirement for the improved efficiency of industrial parts. As the speed increases, there is a decrease in the effect of the dimple of friction characteristic in low velocity, with substantially little change to density. Conversely, as the load increases, the test direction of ellipse type dimple pattern, resulting in a difference in the texture of these two components. At a dimple density of 7.5% the friction characteristic is easily demonstrated, with a consistent change in both speed and load.