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내구시험을 통한 베어링의 열화 특성과 그리스의 화학적 열화 특성 연관성 분석
강보식,이충성,류경하 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.6
This paper introduces the effect of grease on the degradation characteristics of bearings used as key components of packaging equipment and automation systems. Bearings parts are installed to fix and support the rotating body of the system, and performance degradation of the bearings has a great effect on the life of the system too. When bearings are used in various devices and systems, the grease is applied to reduce friction and improve fatigue life. Determining the type of lubricant (grease) is important because it has a great influence on the operating environment and lifespan and ensures long lifespan of systems and facilities. However, studies that simultaneously compared and analyzed the change in mechanical degradation characteristics and the comparison of chemical degradation characteristics according to grease types under actual operating conditions are insufficient. In this paper, three types of small harmonic drive, high-load reducer, and low-load reducer grease used in power transmission joint modules are experimentally selected and finally injected into ball bearings with a load (19,500N) to improve bearing durability. Degradation characteristics were tested by attaching to test equipment. At this time, after the durability test under the same load conditions, the mechanical degradation characteristics, that is temperature, vibration according to the three greases types. In addition, the chemical degradation characteristics of the corresponding grease was compared to present the results of mutual correlation analysis.
강보식,김형의,Gang, Bo-Sik,Kim, Hyeong-Ui 한국기계연구원 1990 기계연구원소보 Vol.20 No.-
Electro-pneumatic valves are an electro-mechanical device which convert electric signal into pneumatic flow rate or pressure signal. Recently, the development tendency of electro-pneumatic valve is to make the valve with more compact and less electric power consumption style. To make the valve such as a style, the role of solenoid part is very important. This paper is used in the finite-element method for the purpose of evaluating the magnetic property of solenoid and analyze flux distribution of solenoid theoretically. From flux contour line which is obtained by numerical analysis, it verified that the plunger shape and physical property of solenoid part have influence on saturation phenomenon and leakage of magnetic fluxs. This paper made an experiment on the measurement of dynamic response time and force in order to confirm the propety of analytic result, and confirmed a good agreement between analysis results and experiment results.
특집 - 기계류부품 신뢰성평가 기술 - 공기압 액추에이터의 신뢰성평가 기술 -
강보식,성백주,Gang, Bo-Sik,Seong, Baek-Ju 재료연구소 2009 機械와 材料 Vol.21 No.3
공기압 액추에이터는 자동화 생산라인 등의 다양한 산업분야에서 사용되고 있으며, 고장이 발생하면 전체 시스템에 막대한 손실을 야기 시킬 수 있는 부품이다. 그러나 기존 공기압 액추에이터에 대한 연구는 설계 관점에서의 연구나 특성해석 및 구동속도 등의 제어관점에서의 연구가 대부분이었으며, 실린더의 수명과 신뢰성에 대한 연구는 거의 이루어지지 않았다. 이와 연관하여 최근 공기압 액추에이터의 신뢰성에 대한 중요성 및 소비자의 요구수준이날로 증대되고 있으며, 최근 공기압 액추에이터의 수명분포 데이터를 분석과 가속수명시험 실시를 통한 수명분포 추정과 형상모수의 동일성 검정, 제안한 복합가속 수명시험 모델에 대한 유용성 검증 등의 연구와 ISO를 중심으로 규격화를 위한 활동이 활발히 진행되고 있다. 따라서 공기압 액추에이터에 대한 신뢰성 평가기법 및 가속수명 시험평가 기술에 대한 기술적 접근법을 소개하고자 한다.
강보식,김형의 대한기계학회 2007 環境管理學會誌 Vol.2007 No.5
The goal of this paper is to introduce two methods to determine a model for the accelerated factor equation for pneumatic cylinder according to the Black equation shape. The loads consist of working pressure and temperature and we adjust these two parameters to reduce the test time but keeping the true behavior of deterioration. The first part will introduce a method using accelerated factor coming from experimental results to determine the coefficient of the Black equation by the method of the least square theory. The second part will introduce another method based on various conditions of test with the assumption that the effect of temperature and the effect of pressure on the life of pneumatic cylinder are independent. In these two cases, the results are the unknown coefficients of the Black equation.
강보식,이승훈,김경수,임남구,김형의 대한기계학회 2007 環境管理學會誌 Vol.2007 No.5
In this study, we are to analyze the life and the main failure mode of pneumatic valves that are usually applied to the factory automation line. Pneumatic valves have complicated failure cause since they are organized as a complex of various elements. Therefore, in this paper, we analyzed the main failure mode of pneumatic valves, and then performed life test and performance test according to the international standards. On the basis of these processes, we estimated a shape parameter that is the main factor for the calculation of test time for the reliability of pneumatic valves by analyzing life distribution data.
강보식,송주섭,유영철,김형의 대한기계학회 2007 環境管理學會誌 Vol.2007 No.5
In this study, we are to analyze the life and the main failure mode of flexible tubes fitting for pneumatic that are usually applied in the factory automation line. Flexible tubes fitting for pneumatic have complicated failure cause because they are organized as a complex of various elements. Therefore, in this paper, we analyzed the main failure mode of flexible tubes fitting for pneumatic, and then performed life test and performance test according to the international standards. On the basis of these processes, we estimate shape parameter that is the main factor for the calculation of test time for the reliability of flexible tubes fitting for pneumatic and their data analysis of life distribution.