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자기연마법에 의한 파인세라믹 Bar의 가공특성에 관한 연구
문상돈(Sang-Don Mun),Takeo Shinmura,Hitomi Yamaguchi,Toshio Aizawa,조철용(Chul-Yong Cho) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In this paper, the possibility of high precision machining was confirmed by using magnetic abrasive finishing process with rotating fine ceramic bar in high speed. Also, in order to improve the surface roughness, it was used the vibration of the magnetic pole and the mixed grain which is mixed with diamond paste for ultra precision processing and electrolytic iron powder. As a result, we knew that there is closely connected with diamond grain size, change of quantity and vibration of the magnetic pole to surface roughness of ceramic bar.
자기연마법에 의한 파인세라믹 Bar의 가공특성에 관한 연구
문상돈(Sang-Don Mun),Takeo Shinmura,Hitomi Yamaguchi,Toshio Aizawa,조철용(Chul-Yong Cho) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
In this paper, the possibility of high precision machining was confirmed by using magnetic abrasive finishing process with rotating fine ceramic bar in high speed. Also, in order to improve the surface roughness, it was used the vibration of the magnetic pole and the mixed grain which is mixed with diamond paste for ultra precision processing and electrolytic iron powder. As a result, we knew that there is closely connected with diamond grain size, change of quantity and vibration of the magnetic pole to surface roughness of ceramic bar.
문상돈(Mun Sang Don),김연직(Kim Yon-jig),임익태(Im Ik-Tae),박찬우(Park Chan Woo) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5
As a technology to machine the 3-dimensional shapes of general metal material more flexibly, machining technologies such as metal cutting, grinding, etc have been steadily improved in their accuracy as well. However, the working method using machining technologies are restricted in terms of surface roughness, metal working accuracy and working hours, if a workpiece has an irregular 3-dimensional shape. Magnetic abrasive finishing process is also one of the super-precision machining technologies which proceed with the finishing metal working of precision working piece using the action of magnetic field and the mixed type magnetic abrasive. However, such studies only focus on the improvement of machining accuracy but are still incomplete in investigating the roundness. This study aims to realize the high accuracy finishing machining focusing on the roundness after magnetic abrasive finishing process of circular workpiece and the surface roughness of precision machining surface.
자기연마법에 의한 파인 세라믹 BAR의 가공특성에 관한 연구
문상돈 ( Sang-don Mun ),( Takeo Shinmura ),( Hitomi Yamaguchi ),( Toshio Aizawa ),조철용 ( Chul-yong Cho ) 한국환경기술학회 2006 한국환경기술학회지 Vol.7 No.3
본 논문에서는 파인 세라믹 바를 고속으로 회전시켜 자기연마법을 이용하여 고정밀가공의 가능성을 확인하였다. 또한 표면 정밀도를 향상시키기 위해 전해철분과 초정밀 가공용 다이아몬드 입자를 혼합한 지립과 자극의 진동을 이용하였다. 결과적으로 다이아몬드의 입자 크기, 양의 변화 그리고 자극의 진동과 세라믹 바의 표면거칠기가 밀접하게 관련되어 있다는 것을 알 수 있었다. In this paper, the possibility of high precision machining was confirmed by using magnetic abrasive machining with rotating fine ceramic bar in high speed. Also, in order to improve the surface roughness, it was used the vibration of the magnetic pole and the mixed grain which is mixed with diamond paste for ultra precision machining and electrolytic iron powder. As a result, we knew that there is closely connected with diamond grain size, change of quantity and vibration of the magnetic pole to surface roughness of ceramic bar.
논문 : 탄소섬유강화 복합재료의 자기연마 가공에 대한 표면특성
문상돈 ( Sang Don Mun ),송준희 ( Jun Hee Song ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.7
Carbon fiber reinforced plastics (CFRP), which have been developed for their high mechanical properties, are insufficient to secure machinery. This paper investigates the use of magnetic abrasive finishing methods and the characteristics of surface roughness for mirror machining of CFRP. The cylindrical surface of CFRP was ground using a diamond paste with sizes of 0.1, 0.5, 1 and 6㎛. Consequently, an effective surface roughness of 0.03㎛(Ra) could be obtained via a paste size of 0.5㎛. The surface roughness was not improved due to epoxy abrasion between the carbon fiber and the epoxy.
송준희,문상돈,김유경,김홍건,Song, Jun-Hee,Mun, Sang-Don,Kim, Yoo-Young,Kim, Hong-Gun 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.3
In recent years there has been a growing interest for the use of natural fibers in composite applications due to their low cost, environmental friendliness, and good mechanical properties. The purpose of this study is to determine the characteristic of bending strength on bamboo fiber reinforced polymer composites. The parameters of RTM process depend on the weight ratio of bamboo fiber and resin, the number of bamboo ply and amount of hardening agent. Besides the existence of pore in composites according to vacuum time investigated a effect on mechanical properties of reinforced polymer composites. Test result shows that compressive strength was a maximum(approximately 1,840kgf/$cm^2$) value when weight ratio of resin was 12%.
복합 이송시스템을 이용한 베타티타늄 와이어의 자기연마가공
남성식(Sung sik Nam),문상돈(Sang don Mun) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.8
티타늄은 의료산업, 교통 등 다양한 분야에서 널리 사용되는 금속이다. 본 연구의 목적은 티타늄 중 탄성이 뛰어나 안경 프레임에 자주 사용되는 β-티타늄 와이어의 자기 연마 최적 가공을 결정하는 실험이다. 자기 연마재마감 공정의 성능을 확인하기 위해 매개변수로 다양한 연마 입자 크기 (0.5 μm, 1 μm, 3 μm), 다양한 회전속도 (700rpm, 1500 rpm, 2000 rpm), 자극부 사이의 거리 (3 mm, 5mm)로 300 초까지 실험을 진행하고 표면 거칠기 (Ra)를 측정하였다. 최적 조건은 회전 속도 2,000 rpm, 연마재 크기 1 μm, 자극부의 거리 3 mm 일때 β-티타늄 와이어의 표면 거칠기가 좋아져 가공력이 우수함을 확인할 수 있었다. 선행 실험에서 얻은 최적 조건으로 와이어 이송시스템, 진동 시스템, 와이어 아송과 진동 시스템을 결합한 복합 이송시스템에 적용하여 실험을 진행하였다. 실험결과는 와이어의 이송과 진동을 결합한 복합 이송시스템의 표면 거칠기 값이 0.05 μm로 가장 좋았고 두번째로는 진동만을 준 실험의 Ra 값이 0.08 μm, 마지막으로 와이어의 이송시스템에서 0.1 μm로 나타났다. [그림 본문 참조]
김병삼(Kim Byoung-Sam),문상돈(Mun Sang Don) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5
To take appropriate measures how to reduce the influence that vibration and noise occurring on the railroad have on neighboring facility is an important issue. And if the vibration raised by the train travelling is input a building structure, its vibration and noise will affect on the building as a whole. In particular, the structure-borne noise, which raises the problem of noise by the vibration propagated into the inside of structural body and the sound radiated from the surfaces of interior wall, floor and ceiling, etc, has a complicated characteristics that repeats the increase and decrease during the process of vibration and sound transfer, it is not easy to take measures. From this situation, the level of noise radiation was reviewed by using the vibration data actually measured to understand the level of structure-borne noise that has been focused as a cause of civil appeals from the residents located railroad vicinity.