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정진오(Jin Oh Chung),고상렬(Sang Ryul Go),최종근(Jong Geun Choi),최희범(Hee Bum Choi),손태관(Tae Kwan Son) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
To clarify the effect of friction temperature on transfer film formation in NAO friction material, friction tests composed of 100 consecutive braking under constant temperature were conducted at temperature of 300℃, 400℃, 500℃ and 600℃, respectively. After friction tests, counterpart disks used were collected for the examination of transfer film formation on friction surface. Friction test results showed that the friction coefficient did not change much with repeated braking under 500℃, but the friction coefficient decreased with repeated braking at 600℃. The transfer film was hardly found under 400℃, but was well developed at high temperature of 600℃. The decrease of friction coefficient with repeated braking in the case of 600℃ was attributed to the development of transfer film with repeated braking.
이성근,정진오,김승규,정완진,Lee, Sung-Geun,Jung, Jin-Oh,Kim, Seung-Kyu,Chung, Wan-Jin 한국금형공학회 2012 한국금형공학회지 Vol.6 No.1
In the manufacturing of a LCD TV bottom chassis, the distortion after forming should be suppressed below pre-defined amount to avoid contact with electric components. Finite element analysis procedure of forming and springback of a LCD TV bottom chassis is developed to investigate the distortion behaviour. It is shown that after the first forming large distortion occur due to uneven metal flow induced by various embossings. In the second forming, distortion is decreased by introducing bead that absorbs the excessive metal flow. It is proved that analysis method could describe these behaviour effectively. The developed analysis method can be used to find the proper location and shape of bead more quickly and effectively.
브레이크 패드에 함유된 섬유재의 성분변화에 따른 마찰특성 연구
박정환(Jung Hwan Park),정진오(Jin Oh Chung),김향래(Hyang Rae Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To access the effect of fiber ingredients on friction characteristics of brake pad material, two kinds of specimens with different fibers were prepared. Fiber materials used in the study are aramid and acrylic fiber respectively, while keeping other ingredients, such as binders, lubricants, abrasives and fillers the same. Two different materials(FC25 and FC17) were used for disk rubbing the friction material. The friction materials were tested by 1/5 scale brake dynamometer and test mode is modified JASO C406-P1. The temperature changes showed almost the same variation throughout the entire mode of fiction test regardless of different materials. However the tested friction coefficient of each specimen showed a variation with different disks and friction materials. In the effective mode, friction coefficients of aramid-containing friction material showed higher friction coefficients than acrylic-containing friction material. The excellent fade resistance was observed when aramid-containing friction material was rubbed against the FC25 disk. The Recovery of fiction coefficient after fade was suitable for all the specimens except that acrylic-containing friction material was rubbed against the FC25 disk. On the other hand, high temperature test result that aramid-containing fiction material exhibited higher friction coefficients than acrylic-containing friction material. The friction stability was excellent for specimens containing acrylic fiber.
브레이크페드에 함유된 연마재의 성분변화에 따른 마찰특성 연구
서영철(Young Chul Seo),정진오(Jin Oh Chung),박정환(Jung Hwan Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
To access the influence of a type and content of abrasive materials on friction characteristics, five kinds of specimens with different abrasive components were specially manufactured by a company for this study. Specimens have different abrasive components as ZrSiO₄, Zeolite, ZrO₂, Al₂O₃, while keeping other components fibers, binders, lubricants, fillers, besides the same. The specimens were tested using a 1/5 scale brake dynamometer to analyze the friction characteristics of the abrasive material. After the friction test, rotors of specimens were cut and polished to observe transfer film formation on the rotor surface by SEM, and the EDX analysis is followed to study the component variation through the transfer film thickness.