• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2001.10a
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• pp.155-160
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• 2001

In the use of glass fiber reinforced plastics(GFRP) it is often necessary to cut the components, but the cutting of GFRP is often made difficult by the delamination of the compositions and short tool life. Experimental investigation was conducted to evaluate the chip formation of the glass fiber reinforced plastics during orthogonal cutting. The chip formation process, cutting force, and thrust force were studied. The chip formation processes were studied through the use of quick-stop device. Chip-tool contact areas were obtained with the use of the quick-stop device, and observed using optical microscopy after polishing. Cutting force and thrust force were measured through the use of the tool dynamometer.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.05b
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• pp.242-245
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• 2000

The fiber contributes the high strength and modulus to the composite. The fiber orientation in FRP has a great effect on the strength of FRP because the strength of FRP mainly depends on the strength of fiber. In this study, FRP was made unidirectionally by pultrusion method and outer part of FRP was made by filament winding method to give fiber orientation to the FRP. The bending strength and bending stresses of FRP rods were simulated according to the winding orientation of glass fiber. The bending strength of FRP was also evaluated. The results of simulation and evaluation Were compared each other to investigate main stresses which affect the fracture of FRP. The main stresses which had a great effect on the strength of FRP were shear stresses.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.1764-1767
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• 2003

It is widely used in composite materials like several mechanical parts. aerospace industries. internal and structural materials of cars, building structures. ship materials and sporting goods. but it is insufficient to apply in field of mechanical processing. Therefore. GFRP which is possible to use in industrial field was examined about cutting force. tool wear condition of cutting, chip shape. surface roughness and inlet or outlet shape of processing parts with changing cutting condition and using HSS drill which is in vertical machining center in this paper.

• Design & Manufacturing
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• v.10 no.3
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• pp.39-45
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• 2016

The purpose of this study is to build effective cooling circuit design in injection mold to improve glass fiber reinforced laptop computer cover plastics' transcription and gloss. Moldflow Insight and Ansys CFD CAE program used to verify efficiency and the experiment mold is precision machined and brazing soldered to make three-dimension cooling channel. The temperature of mold in injection test are fixed to $80^{\circ}C$ and $160^{\circ}C$. The result of this experiment is the improved surface quality of plastics with 85% improvement of transcription in high temperature mold.

• Proceedings of the Korea Concrete Institute Conference
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• 2003.05a
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• pp.822-827
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• 2003

This study was performed to evaluate the internal and external factors affecting external strength of the 3-layer polymer composite pipes made of polymer mortar and fiber-glass reinforced plastic. Twenty four sandwich type 3-layer polymer composite pipes were made of polymer mortar and fiber-glass reinforced plastic by centrifugal method. The objective of this study was to evaluate the effects the of polymer mortar thickness for and core fiber-glass contents per unit area on external strength of 3-layer polymer composite pipes. For the more economical and practical design of 3-layer polymer composite pipe, further study should be done for the various polymer mortar, fiber-glass and different ratio of the inside/outside FRP thickness.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.2 no.2
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• pp.37-44
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• 2003

Composite materials are widely used to make all kinds of machine parts, internal and structural materials of cars, aerospace industries, building structures, ship materials, sporting goods and others. It is worth the while to use composite materials as various substitutions when compared With others. But the use is limited in the field of the mechanical processing because of its difficulties in cutting. The surface roughness of in and out in the hole processing was discussed after cutting the GFRP with HSS drill in the vertical machining center. And it is observed that as it processed more, the powdered chip may be got more than the fluid type long chip.

• Journal of the korean Society of Automotive Engineers
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• v.10 no.1
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• pp.33-41
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• 1988

A turning (facing) test on Glass Fiber Reinforced Plastics was performed with several tool materials, e.g., cemented carbides, cermet and ceramic, and the wear patterns and wear rate were analyzed to clarify the relation between physical(mechanical) properties and flank wear of cutting tool. The main results are obtained as follows: (1) When cutting speed is increased, the flank wear in every tool material grows the abnormal wear in the shape of triangle at a certain speed, i.e., a critical speed. (2) When cutting speed is increased, the wear rate in experimental tool material starts to increase remarkably at a critical speed. (3) The thermal conductivity among the properties of the tool material and the thermal crack coefficient of it are almost in proportion to the critical speed. (4) The order of performance in tool materials for cutting GFRP is K 10, M10, P20, TiC, CB.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.536-538
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• 2009

현재 세계 각 국은 폐차에 의한 환경오염을 줄이기 위하여 규제를 강화하고 있으며 특히 EU(European Union)에서는 현재 85%에 머무르고 있는 재활용율을 2015년까지 95%로 올릴 것을 요구하고 있다. 이에 발맞추어 2007년 우리나라도 "전기전자제품 및 자동차의 자원순환에 관한 법률"을 제정하였다. 자동차 중량의 75%를 차지하는 철은 비교적 높은 재활용율을 보이고 있으나 나머지 25%를 구성하는 플라스틱, 유리 고무 등의 비금속류와 구리, 니켈 알루미늄 등의 비철금속류는 재활용율이 이에 미치지 못하고 있다. 본 논문에서는 자동차에서 많이 사용되는 대표적인 비철금속인 구리에 대하여 재활용의 현주소를 점검하고 앞으로의 개선책을 논의하고자 한다.

• The monthly packaging world
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• s.206
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• pp.96-107
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• 2010

지식경제부가 2010 미래패키징신기술 정부포상 심사 결과를 발표했다. 미래피키징 신기술 정부포상은 국내 패키징(포장) 산업의 우수한 기술 및 국내 패키징 산업의 발전에 기여한 유공자를 발굴, 포상함으로써 관련 종사자의 사기진작 및 기술개발 의욕을 고취하고, 궁극적으로는 국내 제조업의 경쟁력 강화를 극대화하기 위해 마련됐다. 포상부문은 코리아스타상(일반부문, 학생부문), 유공자 표창(표창장)으로 구분하여 시상한다. 코리아스타상 일반부문은 패키징 완제품, 재료(플라스틱, 종이 판지, 금속, 유리, 목재, 복합소재), 친환경, 기계(설비) 및 관련부품, 인쇄(라벨링), 부자재, 생산 및 가공공정, 패키지 디자인 등의 분야에서 신기술 개발 또는 개선으로 수출신장, 매출 수익 증대 및 발명특허 획득을 통해 패키징 기술력 발전에 기여한 기업을 대상으로 하며 코리아스타상 학생부문은 패키징 디자인 관련분야 전공자로 패키징과 연관된 컨셉으로 제품에 적용 가능한 상품성, 창의성, 표현성, 친환경성, 지속가능성 등이 어우러진 독창적인 제품을 대상으로 한다. 또한 유공자 표창 부문은 패키징 관련 핵심 기술개발, 패키징산업발전 정책연구 및 패키징산업 육성 등에 기여한 개인을 대상으로 시상하게 된다. 본 고에서는 2010 미래패키징 신기술 정부 포상 수상작들에 대해 살펴보도록 한다.

• Mineral and Industry
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• v.29
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• pp.1-17
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• 2016

점토광물은 자연 산출되는 광물로써 양이 풍부하고 가격이 저렴하여 여러 가지 산업자원으로써 오래전부터 다양하게 활용되어 왔다. 전통적인 주요 활용분야로는 제지 및 코팅 산업의 충진제, 내화재, 세라믹, 유리섬유, 시멘트 등에 90% 이상이 사용되어왔다. 최근에야 고무, 플라스틱 및 페인트의 물성 강화용 충진제로, 넓은 표면적을 활용한 촉매제로 일부 사용되고 있지만 대부분 판상용 점토광물을 대상으로 하고 있다. 고령토가 국내 생산 주요 품목에 들어가지만 그 비중은 2014년 기준 1.9%로 낮으며, 그나마 자급율도 77% 수준이라 수입에 의존하고 있다. 생산되는 고령토의 양이 매년 감소하고 있는 추세이며, 2014년 기준 고품질인 Wa와 Wb의 생산량이 각각 600 톤과 227 톤으로 미미한 수준이며 P급이 4.1만 톤 수준이라 부가가치가 매우 낮은 상품 중의 하나로 보인다. 다행히 우리나라에서 생산되는 고령토의 많은 부분이 할로이사이트 계열 고령토이고, 할로이사이트의 독특한 나노튜브 형태는 신소재 개발과 더불어 부가가치가 높은 새로운 활용분야를 개척하기 아주 적절한 광물이어서 그 특성과 산업적 활용 특성을 중심으로 최신 연구동향과 활용분야를 소개하고자 한다.