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- 저자 : 이기천(Gi Chun Lee) (검색결과 102 건)
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이기천(Gi-Chun Lee),이용범(Yong-Bum Lee),남태연(Tae-Yeon Nam),양청광(Cheong-Gwang Yang),김성현(Sung-Hyun Kim),송은택(Eun-Taek Song),김상덕(Sang-Duck Kim),김재훈(Jae-Hoon Kim) 한국신뢰성학회 2021 신뢰성응용연구 Vol.21 No.4
Purpose: The screws used in agricultural machinery are worn by friction due to relative motion during prolonged high-pressure use. The wear can be categorized as abrasion and cohesion wear, which shorten the performance and life of agricultural machinery and eventually lead to failure. This study focused on determining the wear rate of the screw surface in dehydration machinery. Methods: We sought to select the optimal material by comparing and analyzing the wear characteristics of three types of materials: STS, SCM, and SNCM. The wear test was performed under variable load, dry, and wet conditions on a total of 3 samples using a pin-on-disk wear tester. The friction coefficient, amount of wear, and specific wear rate were obtained from the test results and compared for the three materials. Results: The friction surface was imaged using SEM. It was found that the specific wear rate of STS was the highest under all load conditions in both dry and wet environments. The specific abrasion rate of SCM was similar to that of SNCM in a dry environment but the lowest in a wet environment, revealing its excellent abrasion resistance. Conclusion: A material with high wear resistance was identified by analyzing the wear characteristics of three types of materials. Moreover, its use increased durability of the screw, a critical component in dewatering machines.
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압력과 온도 복합가속모형을 적용한 유압호스 조립체 수명특성 연구
이기천(Gi Chun Lee),김형의(Hyoung Eui Kim),조유희(You Hee Cho),김재훈(Jae Hoon Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
유압호스는 건설기계, 자동차, 항공기 등 각종 기계의 유압장치에서 동역을 전달하기 위한 배관으로 사용된다. 산업의 전분야에서 에너지를 전달하기 위한 배관의 한 종류로써 진동이나 충격 등으로부터 시스템을 보호하는 역할을 한다. 여러 가지 외부 환경 조건으로부터 시스템을 유지하기 위해서는 호스 조립체에서 온도와 압력 등의 외부 환경 조건에 대한 내성을 가지고 있어야만 한다. 본 연구에서는 기존에 호스 조립체에 대해 온도 또는 압력 중 한 가지 인자를 고려한 가속모형을 제시한 연구는 있었지만 두 가지 인자를 동시에 고려한 가속모형은 제시하지는 못하였으므로, 호스 조립체의 압력과 온도를 모두 고려한 복합가속 모형식을 제안하는 것을 목적으로 한다. The hydraulic hose used to the delivery of hydraulic power to the hydraulic mechanism of the mechanical system in construction, automobile, airplane, and etc. The hose assembly roles to protect from the vibration and impulse in the all industry field as one of the kind of piping system to delivery the energy. To keep the system safely from the various outside environments, the hose assembly endures the various factors like the pressure, temperature and etc with the outer environment. This study deals with the hydraulic hose assembly adopting the complex accelerated model with pressure and temperature considering with the two factors simultaneously, because there were the life prediction models proposed with one factor like the pressure and the temperature separately.
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이기천(Gi-Chun Lee),이용범(Young-Bum Lee),최병오(Byung-Oh Choi),이규석(Kye-Suk Lee),최종식(Jong-Sik Choi) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
In the field of the construction, agricultural and automobile industry as high-efficiency of the hydraulic systems have been required the main components such as hydraulic hose, valve, accumulator, pump and center joint are required proof-pressure and durability test. In the case of hydraulic hose installed on an excavator, proof-pressure as well as flexing motion is essentially required. therefore, the international standards, which are EN ISO 8032 and SAE 343, have been applied differently. The tester can select the mechanism depends on which application we use. This study has tried to get the life characteristic, shape parameter & failure modes, of the hose assembly in the case of the 2 different mechanisms according to ENISO 8032 and SAE 343 test method.
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건설기계용 카운터웨이트 시험장비 및 가속수명시험법 개발
이기천(Gi-Chun Lee),이용범(Young-Bum Lee),최병오(Byung-Oh Choi),김도식(Do-Sik Kim),최종식(Jong-Sik Choi) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
The counter weight is a heavy material installed in equipment to balance the center of gravity of construction machinery or special equipment. When the connection part of the counter weight, which is connected to the construction machinery such as the excavator or a fork lift, is broken to be separated, it can be very risky due to the loss of the center of gravity and its overturn. So, it is necessary to secure its reliability. However, to perform the life testing of the counter weight, it is required to have very large-sized exciter which simulates the vibration to the about 2-tons heavy material similar to that occurring in the real field. Firstly, the stress of the broken part of the counter weight is analyzed by failure analysis performed for the major components in this paper. Secondly, the field data acquired in the site was applied to the life test of the counter weight. Also, we developed the life test equipment, which is simulated real service condition with a rotational vibrator using the electric motor, to evaluate the reliability of the construction machineries even though the weight of the sample was heavy weight about 2 tons.
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