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FTS를 이용한 나노표면개질공정의 공정변화와 소재에 따른 표면특성
김미루(Mi Ru Kim),이득우(Deug Woo Lee),이승준(Seung Jun Lee),Li Liang,김종만(Jong Man Kim),장남수(Nam-Su Jang) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.6
A treatment for improving the characteristics of a surface is very important in increasing the life of machine parts. Many studies have been carried out on the surface characteristics after such treatments. For enhanced eco-technology, an alternative to a conventional chemical surface treatment process is essential. Ultrasonic nano-crystal surface modification (UNSM) technology is a physical environmentally friendly surface treatment method. This technology was developed in domestic and currently being used. As the mechanism of UNSM technology, a ball tip attached to an ultrasonic vibration device strikes the metal surface at nearly 20,000 times per second. The resulting modified surface layer improves the surface characteristics. This paper describes a self-developed fast tool servo system applied to the UNSM process as a vibration module within a high-frequency bandwidth. After describing the surface modification process based on the material and process changes, the surface characteristics are compared.
돌기접촉을 고려한 거친 표면 위 다양한 패턴 형상에 따른 윤활 특성 연구
김미루(Mi-Ru Kim),이승준(Seung-Jun Lee),정재호(Jae-Ho Jeong),이득우(Deug-Woo Lee) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.4
Two surfaces that have relative motion show different characteristics according to surface roughness or surface patterns in all lubrication areas. For two rough surfaces with mixed lubrication, this paper proposes a new approach that includes the contact characteristics of the surfaces and a probabilistic method for a numerical analysis of lubrication. As the contact area of the two surfaces changes according to the loading conditions, asperity contact is very important. An average flow model developed by Patir-Cheng is central to the study of lubrication for rough surfaces. This average flow model also refers to a multi-asperity contact model for deriving a modified Reynolds equation and calculating the lubricant characteristics of a bearing surface with random roughness during fluid flow. Based on the average flow model, this paper carried out a numerical analysis of lubrication using a contact model by considering a load change made by the actual contact of asperities between two surfaces. Lubrication properties show different characteristics according to the surface patterns. This study modeled various geometric surface patterns and calculated the characteristics of lubrication.
틸팅 패드 베어링의 트라이볼로지 특성 평가를 위한 유막두께 측정 방법 연구
김미루(Mi-Ru Kim),이득우(Deug-Woo Lee),이승준(Seung-Jun Lee),시티 누르파딜라 빈티 자이니(Siti Nurfadilah Binti Jaini),정재호(Jae-Ho Jung) 한국생산제조학회 2020 한국생산제조학회지 Vol.29 No.5
In studies on lubrication analyses, researchers have investigated mixed lubrication as well as hydrodynamic lubrication. One of these published studies concerns lubrication analysis by considering not only the surface roughness but also the slope parameter of the friction surface; in the study, the relative slope of the pad bearing surface was confirmed to influence the friction characteristics. However, verification of whether the lubrication analysis values are comparable to those of the friction tests is yet to be conducted. In this study, to experimentally verify the results of this previous lubrication analysis, we developed an experimental device to derive the slope parameter and analyzed the results. The film thickness was calculated by analyzing the slope parameter obtained from the friction tests and was then used as the input value for lubrication analysis.
돌기 접촉 모델과 평균 유동 분석을 이용한 딤플 패턴의 윤활 특성에 관한 연구
김미루(Mi-Ru Kim),이승준(Seung-Jun Lee),리량(Liang-Li),이득우(Deug-Woo Lee) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.6
To evaluate lubrication properties by surface roughness under boundary and mixed lubrication, a new approach is suggested by both asperity flow and contact with stochastic characteristics. Many researchers already have studied the effect of surface roughness on flow. But, it has become important to research of the phenomenon of asperities contact in surfaces because the growth of asperities contact area under heavy load conditions. In this paper, flow factors in the average flow model derived by Patir and Cheng were used, and a multi-asperity contact model was included to calculate lubrication properties of a surface with a randomly generated rough surface. A numerical analysis using the average Reynolds equation with both the average flow model and the asperity contact model was conducted, and the results were compared with those from previous research. The results showed that the influence of asperities on lubrication and the friction coefficient changed rapidly on application of contact model.
프로야구 경기장의 배치 기준 요소에 관한 연구 - 한, 미, 일 사례 비교분석을 중심으로 -
김미루(Kim, Mi-ru),윤동식(Yoon, Dong-Sik) 대한건축학회 2022 대한건축학회 학술발표대회 논문집 Vol.42 No.1
In the Korean professional baseball market, professional baseball stadiums, which had been built since the launch of professional baseball(1982), have aged over time and are gradually failing to meet the new needs of players and visitors, leading to a new stadium. However, there have been many studies related to the marketing and servicescape of professional baseball stadiums published so far, and studies on the architectural design of professional baseball stadiums and the criteria for layout format are insufficient. Therefore, the purpose of this study is to serve as basic data for the design of professional baseball stadiums by presenting the criteria for the arrangement of newly constructed professional baseball stadiums.
TiCrN 코팅이 Inconel 617 합금의 고온안정성에 미치는 영향
이병우,박종천,김미루,구진희,김병익,조현,Lee, Byeong-Woo,Park, Jong-Cheon,Kim, Mi-Ru,Koo, Jin-Heui,Kim, Byeong-Ik,Cho, Hyun 한국결정성장학회 2011 한국결정성장학회지 Vol.21 No.6
TiCrN layers (Ti : Cr = 20 : 80 and 5 : 95 wt%) were deposited on Inconel 617 and the effect of TiCrN coating on the high temperature stability of Inconel 617 up to $1000^{\circ}C$ was examined. XRD analysis and microstructural observation showed that vigorous and inhomogenous Cr diffusion to the surface was suppressed by TiCrN layer compare to the uncoated Inconel 617. This led to a distinctive enhancement in thermal oxidation resistance of Inconel 617. 두 가지 조성의 TiCrN 코팅층(Ti : Cr = 20 : 80 및 5 : 95wt%)을 Inconel 617 합금 위에 증착하고, 1000oC까지의 온도영역에서 TiCrN 코팅이 Inconel 617 합금의 고온안정성에 미치는 영향을 조사하였다. XRD 분석과 미세구조 관찰을 통해 표면으로의 불균일한 Cr 확산이 TiCrN 층에 의해 억제되었음을 알 수 있었다. 그 결과 Inconel 617의 열산화 저항성이 현저하게 향상되었음을 확인하였다.
홈의 형상에 따른 센서 감지거리 변화를 이용한 공구상태 모니터링에 관한 연구
손길호(Gil-Ho Son),김미루(Mi-Ru Kim),이승준(Seung-Jun Lee),정재호(Jae-Ho Jeong),류경희(Kyung-Hee Lew),이득우(Deug-Woo Lee) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.5
Research in the machine tool industry has focused on ICT-based smart machines rather than hardware technologies related to machine tools. Real-time tool-status monitoring is representative of this type of technology and has become important for measuring sensors during cutting processes. In this paper, we studied several research areas and used a round bar to conduct fundamental research into the axial displacement of the main spindle of a tool when it was subjected to a machining load. We were able to use the gap sensor to detect the axial displacement indirectly by using grooves with various shapes on the round bar and sensing the gaps between the grooves. We then determined the optimal groove shape for monitoring the tool state.