• Journal of the Korean Society for Precision Engineering
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• v.24 no.10
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• pp.31-36
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• 2007

• Journal of the Korean Society for Precision Engineering
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• v.10 no.1
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• pp.14-21
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• 1993

비규면의 경면 가공으로 대표되는 초정밀 가공 기술은 '90년대에 와서는 이미 일반화되어가고 있으며, 양산화 시대를 맞이하고 있다고 보아야 할 것이다. 최근의 초정밀 가공 기술은 레이저 가공기를 비롯하여 일상용품으로 많이 사용되는 카메라, 컴팩트 디스크, 콘택트렌즈, 컴퓨터 디스크 등에 활용됨은 물론 대구경천채망원경, 우주 및 군사용의 레이저, X-선을 중심으로한 광기술에 점점 그 용도가 확대되어 가고 있다. 현재 초정밀 가공기가 응용되고 있는 부품의 예를 들어보면 표1과 같다. 우리나라의 초정밀 가공 시스템 기술은 선진국에 비하여 아직은 한단계 낮은 수준으로 평가되나, 최근 전자, 컴퓨터 산업의 발전과 더불어, 그 수요가 증가되고 있어 최근에는 그 응용기술, 가공시스템에 관한 연구개발이 산,학,연 여러 곳에서 활발해 지고 있다. 본 고에선 초정밀 절삭,연삭 가공시스템을 중심으로 가공기와 요소기술의 개발동향에 관하여 살펴 보고자 한다.

• Journal of the Korean Society for Precision Engineering
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• v.23 no.6 s.183
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• pp.29-36
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• 2006

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.245-246
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• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.19-20
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• 2010

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.40 no.4
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• pp.337-343
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• 2004

This paper presents an experimental study of friction and wear properties of a unidirectional oriented continuous crbon-fiber reinforced epoxy composite at the ambient temperature. Friction and wear experiments were conducted in the three principal sliding direction of the fiber orientation in the composite were selected against the stainless steel counterpart specularly processed were using a pin -on-disc apparatus. Friction coefficient and specific wear rate at various normal loads and sliding velocities wear determined. When sliding took place against smooth and hard counterpart, the hightest were resistance and the lowest friction coefficient were observed in the anti-parallel direction. The wear track of the worn specimens was examined with a scanning electron microscope(SEM) to observe the damaged fibers on the surface. In addition, SEM observations of the worn surfaces allowed to identify the involved different wear mechanisms.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.4 no.3
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• pp.31-38
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• 1995

Magnetic-electrolytic-abrasive polishing(MEAP) system was newly developed and the finishing characteristics of Cr-coated roller was analyzed. The paper describes the operational principle of MEAP system and magnetic field effect on the MEAP process by experimental results. The finishing characteristics and optimal finishing condition for Cr-coated roller was experimented and analyzed.

• Journal of Power System Engineering
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• v.6 no.2
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• pp.60-67
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• 2002

연삭가공은 나노스케일(Nano-scale)의 미소한 입자 절삭날을 이용한 가공으로, 공작물의 표면을 경면(Mirror surface)으로 가공할 수 있어 제품의 최종 마무리공정으로 사용되어 왔다. 그러나 연삭공정에 있어서는 공구(연삭숫돌)의 수명이 다하거나 가공계(Machining system)가 불안정해지면 채터진동과 연삭버닝 등의 현상이 발생하여 가공물의 표면품위를 저하시키는 요인으로 작용하고 있다. 따라서 본 연구는 원통플른지 연삭공정을 대상으로 공작물에서 발생하는 음향방출 신호와 연삭기 주축 모터의 동력 신호를 연삭가공 중에 검출하고, 이를 신경회로망에 적용하여 연삭가공 상태를 진단하는 시스템을 구축하고, 그 성능을 평가하였다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.13 no.5
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• pp.76-81
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• 2014

The Engineering ceramics have some excellent properties as materials for modern mechanical and electrical components. It is, however, not easy to polish them efficiently because they are strong and hard. This study is carried out to obtain a mirror surface on engineering ceramics by surperfinishing with high efficiency. To achieve this, we conducted a series of polishing experiments using representative engineering ceramics, such as $Al_2O_3$, SiC, $Si_3N_4$ and $ZrO_2$, using diamond abrasive film from the perspective of oscillations peed, the rotational speed of the workpiece, contact roller hardness, contact pressure and feed rate. Furthermore, the polishing efficiency and characteristics for engineering ceramics are discussed on the basis of optimal polishing time and surface roughness. Our results confirmed that efficient superfinishing conditions and polishing characteristics of engineering ceramics can be determined.

• Journal of Powder Materials
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• v.20 no.4
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• pp.297-301
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• 2013

Mirror surface machining for large area flattening in the display field has a problem such as a tool wear and a increase in machining time due to large area machining. It should be studied to decrease machining time and tool wear. In this paper, multi-tool machining method using a PCD tool and a SCD tool was applied in order to decrease machining time and tool wear. Machining characteristics (cutting force, machined surface and surface roughness) of PCD tool and SCD tool were evaluated in order to apply PCD tool to flattening machining. Based on basic experiments, the PCD/SCD multi-tool method and the SCD single-tool method were compared through surface roughness and machining time for appllying large area mold machining.