• 한국생산제조학회지
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• 제7권5호
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• pp.127-133
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• 1998

This research intends to gain the sight for the qualitative characteristics of precision cutting by using the CNC lathe with a mono-crystal diamond(MCD) and a poly-crystal diamond(PCD) tool on the cutting distance. In case of an MCD tool, as the cutting distance increases, the surface roughness becomes worse and the standard deviation of surface roughness is small. In case of a PCD tool, as the cutting distance increases, the surface roughness becomes stable with a large standard deviation. The cutting force ratio(Ft/Fn) decreases as the nose radius increases and the decreasing ratio becomes larger for small nose radius.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2007년도 추계학술대회 논문집
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• pp.85-86
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• 2007

상용으로 사용되고 있는 Sargent bath에 수십 나노크기의 다이아몬드 분말을 혼입하여 전기도금법에 의해 매우 우수한 표면 특성을 갖는 크롬 복합 도금층을 얻었다. 상기 복합 도금층은 순수 크롬 도금층의 미세 경도(Hy. 801)보다 높은 값(Hy. 920)을 나타내었고, 내마모성은 약 3-4배 뛰어난 성능을 보였다. 또한, NaCl 수용액에서 수행한 내식성 테스트에서는 크롬 복합 도금층이 순수 크롬 도금층대비 1/6 수준의 passive current를 가졌다. SEM을 통한 표면 형상 관찰 결과 크롬 도금층에 혼입된 나노 다이아몬드 분말은 단결정 혹은 다결정의 형태로 존재하였다.

• 한국정밀공학회지
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• 제28권6호
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• pp.694-700
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• 2011

Since polycrystalline diamond (PCD) has high hardness like diamond, it has been used as tool material for lathe and milling of non-ferrite material. A micro tool fabricated from PCD material can be used for micro machining of hard material such as tungsten carbide, glass, and ceramics. In this paper, micro PCD tools were fabricated by micro EDM (electrical discharge machining) and used for micro grinding of glass. Craters generated on the tool surface by EDM spark work as like grits in grinding process. The effects of tool shapes, tool roughness and PCD grain size were investigated. Also studied was a hybrid process combining electrochemical discharge machining (ECDM) and micro grinding for micro-structuring of glass.

• 한국생산제조학회지
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• 제9권1호
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• pp.75-80
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• 2000

This paper deals with the precision cutting characteristics of mono-crystal diamonds poly-crystal diamonds and tungsten carbide tool on ductile material. The cutting tests were carried out under various uncut chip areas and 20${\mu}{\textrm}{m}$ depth of engagement. The machinability in precision machining was discussed from the viewpoints of the normal cutting forces and the surface roughness of the workpiece. As the feed rate decreases the normal force difference for cutting edge radii appears to large. In various cutting edge radii the surface roughness difference when cut the copper which is ductile material than the aluminium alloy is large. As the same cutting condition the hardness value on cut surface with the diamond tool appears to be smaller than that of the tungsten carbide tool.

• 한국기계가공학회지
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• 제11권3호
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• pp.41-47
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• 2012

Surface roughness is widely used as an index for processing degree of accuracy. Recently, regression analysis to predict the machining results are actively used to characterize a cutting operations. In the past, diamond machining had been used for ultra precision cutting operation, but now industrial diamond tools like PCD(Polycrystaline Diamond) has been widely used in ultraprecision machining of nonferrous metals. In this study, the authors focus on the effect of PCD tool property on the surface roughness of different types of aluminum alloy after cutting process by CNC operated lathe. Based on the regression analysis approach on a surface roughness data obtained by experiment, predictive analysis of surface roughness is effective to achieve better surface quality.

• 대한기계학회논문집
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• 제16권12호
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• pp.2279-2286
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• 1992

본 연구에서는 절삭가공만으로 실리콘 석출을 위한 경면가공을 얻기위한 최적 의 조건을 찾고자 한다.

• 한국기계가공학회지
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• 제11권6호
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• pp.69-74
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• 2012

Surface roughness is widely used as an index for processing degree of accuracy. Recently, regression analysis to predict the machining results are actively used to characterize a cutting operations. In the past, diamond machining had been used for ultra precision cutting operation, but now industrial diamond tools like PCD(Polycrystalline Diamond) have been widely used in ultraprecision machining of nonferrous metals. In this study, the authors focus on the effect of PCD tool property on the surface roughness of Al5083 aluminum alloy after cutting process by CNC operated lathe. Based on the regression analysis approach on a surface roughness data obtained by experiment, predictive analysis of surface roughness is effective to achieve better surface quality.

• 대한기계학회논문집A
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• 제20권4호
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• pp.1216-1224
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• 1996

In the use of glass fiber reinforced plastics it is often necessary to cutting the components, but the cutting GFRP is often made difficult by the delamination of composites and the short tool life. In this paper, the machinability of GFRP by mean of tool materials and type was experimentally investigated. By proper selection of cutting tool material and type excellent machining of this workpiece is achieved. The surface quality relate closely with the feed rate and cutting tools.

• 한국결정성장학회지
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• 제12권6호
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• pp.311-316
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• 2002

2-step 증착법과 Bias-Enhanced Nucleation(BEN)법을 이용해 다결정 Ni 기판에 고품질의 다이아몬드 박막 합성을 연구하였다. $810^{\circ}C$에서 1시간 증착하여 soot충을 형성시킨 후 기판온도를 soot층의 형성이 억제되는 온도인 $925^{\circ}C$로 올려 5시간 증착하는 2-step법을 통해 고품질의 다이아몬드를 합성할 수 있었다. 또한, $925^{\circ}C$에서 -220V의 bias를 10분 동안 기판에 인가한 후 2시간 동안 증착하는 BEN법을 이용해 양질의 다이아몬드를 합성할 수 있었다. $925^{\circ}C$에서 bias 처리를 하지 않은 경우에는 10시간 동안 증착을 시도한 후에도 다이아몬드가 생성되지 않았다.

• 한국기계가공학회지
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• 제12권4호
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• pp.10-15
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• 2013

In order to fabricate high sensitive and stable biosensors, we require the material with superior biocompatibility and physical-chemical stability. Many kinds of biomaterials have been evaluated to apply for bioindustry. Recently, carbon based diamond thin films have been focal pointed as bio-applications and their possibility has been evaluated. Diamond thin film has many advantages for electrochemical and biological applications, such as wide potential window (3.0-3.5V), low background current and chemical-physical stability. In this work, we have cultured neuroblastoma cell (SH-SY5Y) on the crystalline diamond films. We use MTT assay to evaluate the characteristic of cell culture on the substrates. As a result, neuroblastoma cell was cultured on the crystalline diamond film as similar as cell culture dish.