• 한국건설순환자원학회논문집
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• 제4권2호
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• pp.74-84
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• 2009

본 연구에서는 생산방식에 따라 생산된 고품질 순환모래의 기초물성평가를 통한 품질특성을 실험 실증적으로 평가함으로서, 최종 생산된 순환모래에 대한 성능을 평가하고, 목표 품질의 달성과 향후 성능 보완 및 활용의 확대, 고부가가치 창출을 위한 기초자료를 제시하고자 하였으며, 본 연구의 기초물성 실험결과, 직렬식 건식생산시스템과 병렬식, 소용량 습식생산시스템과 대용량을 거쳐 최종 생산된 순환모래인 RS-IV의 경우 절대건조밀도, 0.08mm체 통과량, 점토덩어리량, 유기이물질함유량에서 KS F 2573(순환잔골재) 기준에 만족하였으나, 흡수율에서는 대 소용량 습식생산시스템을 거쳐 최종 생산된 RS-IV만이 KS F 2573 기준치 5% 이하에 만족하였다. 흡수율의 품질 개선율 경우, 직렬식 건식생산시스템(7.13%), 병렬식(19.89%), 소용량 습식생산시스템(27.41%), 대용량(54.56%), 0.08mm체 통과량 경우, 직렬식 건식생산시스템(22.22%), 병렬식(39.92%), 소용량 습식생산시스템(91.89%), 대용량(98.16%), 점토덩어리량 경우, 직렬식 건식생산시스템(50.34%), 병렬식(76.77%), 소용량 습식생산시스템(98.60%), 대용량(99.32%)등으로 직렬식 건식생산시스템에 비하여 병렬식, 소용량 습식생산시스템에 비하여 대용량, 건식생산시스템에 비하여 습식생산시스템의 품질 개선율이 우수한 것으로 나타났다.

• 한국기계가공학회지
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• 제1권1호
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• pp.48-54
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• 2002

In industrially advanced countries, environmentally conscious machining was eagerly studied because of ecological and economical reasons. As the environmental regulations become stricter, new machining technologies which take environmental aspects into consideration are being developed Industry and research institutions established applications for dry, semi-dry, oil-mist and compressed cold air machining. This paper investigates the performance of new compressed cold air system for environmentally conscious machining and evaluates machinability of dry and new compressed cold air machining. A series of tests are carried out using measuring eqipments under dry and compressed cold air machining.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2003년도 추계학술대회
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• pp.66-70
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• 2003

Recently, environmental conscious machining becomes one of the most important technology in modern manufacturing industry. Especially in metal cutting, cutting fluid often results in many environmental problems. Many technologies have been developed to reduce the problems of the cutting fluid. But most of the technologies need another devices which sometimes require large space and also are very expensive, such as cooling system. In this paper, air compressor is only used to replace the functions of cutting fluid as semi-dry cutting. Cutting forces, cutting moments, and tool wear were measured to obtain cutting characteristics, and were compared with those of dry cutting and non-dry cutting. In the results of the experiments, semi-dry cutting was found to show better cutting performances than dry cutting and non-dry cutting.

• 한국정밀공학회지
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• 제31권6호
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• pp.505-511
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• 2014

In this paper, silver pastes were printed on polyethylene terephthalate (PET) film using screen printing and evaluated the drying characteristics by using dry oven and NIR drying system. The printed Ag films were dried at $140^{\circ}C$ and the drying time was changed from 10 to 90 seconds. To evaluate the electrical properties of printed Ag film, sheet resistance was compared. The sheet resistance of the dried thin silver film by using NIR drying system more rapidly decreased. To clarify this phenomena, the morphology and component of the dried surfaces were measured by using the scanning electron microscope (SEM) and the energy dispersive X-ray Spectroscopy (EDX), respectively. In the EDX measurement results, the oxidation of the surface was observed in the dried thin film by using the dry oven. The NIR drying system is more applicable than conventional hot air drying to apply continuous printing system.

• 한국공작기계학회논문집
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• 제17권6호
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• pp.111-117
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• 2008

An automation process of filter unit is presented for the application of the assembling procedure and dry furnace work. By that automation procedure, it is expected to enhance working environment such as reducing laboring load, harmful gas, and burning scald. Furthermore, this automation process also minimizes via standardization of manufacturing process so that it may increase productivity and reliability. An automation process of filter unit is presented for the application of the assembling procedure and dry furnace work. Filter automation process also gives a good quality and productivity by simplifying to only one line from the complicated process such as filter cutting$\rightarrow$ adhering$\rightarrow$fabricating in a very small space. It is found that a new conceptual design of dry furnace shows the better quality like uniform heat distribution compared to the conventional design. It is also found that the present design gives a better working environment by adding cooling system.

• 한국생산제조학회지
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• 제24권2호
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• pp.256-262
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• 2015

This study has an innovative improvement of the ocher tiles production system that aims to resolve social issue of industrial waste and to meet the customer needs for environmental-friendly building materials. By changing a wet type cutting method to a dry type of ocher tiles production system, the three processes such as cleaning, dehydration, and drying can be removed in existing overall process of 17 steps. Accordingly, the application of the wet type cutting method, which is proposed in this study, makes an increase in ocher tiles production from 1,500 to 1,850 pieces per hour. In particular, industrial wastewater that was emerging as the biggest problem in environmental pollutants in the wet cutting method has been removed. In addition, the most serious problems of noise and dust from the operator side, while developing a device for the dry cutting method, are eliminated through the development of additional equipment.

• 한국기계가공학회지
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• 제3권4호
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• pp.29-36
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• 2004

An experimental study on drilling of stainless steel is conducted using TiAlN coated drills and HSS twist drills with several cutting conditions; feed rate, spindle rotational speed, and dry/wet cutting. The effects of number of hole on the thrust force are examined by cutting force measurement. The flank wear of the drills and the change of hole diameter are quantitatively observed using a vision system. It is found that the thrust force in drilling with TiAlN coated drills decrease under dry and wet machining, whereas the flank wear resistance is improved.

• 한국공작기계학회논문집
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• 제13권2호
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• pp.127-132
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• 2004

In industrially advanced countries, environmentally conscious machining was eagerly studied because of ecological and economical reasons. As the environmental regulations become stricter, the new machining technologies which take environmental aspects into consideration are being developed. Recently the research institutions have established application method for dry, semi-dry, oil-mist and compressed cold air machining. In this paper the performance of new compressed cold air system for environmentally conscious machining is investigated and machinability of dry and new compressed cold air machining is evaluated. A series of tests are carried out by using measuring equipments in condition of dry and compressed cold air machining.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
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• pp.481-484
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• 2008

본 연구에서는 경제성, 환경부하저감성 및 순환잔골재의 품질개선효과가 우수한 순환잔골재 건식생산기술로서 고속회전충격식 비중분리장치 및 원심력 미분말 집진장치 등으로 구성된 건식생산시스템을 개발하고 각 공정별 건식생산기술의 주요 메커니즘을 규명함으로서 향후 레미콘용, 2차 제품용 등 고부가가치용의 고품질 순환잔골재 활용을 위한 기초자료를 확보하고자 한다. 그 결과 고속회전충격에 의한 순환잔골재의 파쇄작용, 원심력 및 질량차에 의한 미분말과 미세분진의 분리 및 집진작용에의해 순환잔골재의 고품질화에 효과가 있을 것으로 사료된다. 또한 파쇄장치의 효율, 고속회전충격식 비중분리장치 회전날개의 구성, 파쇄분리공정의 배치 등에 따른 연구가 추가적으로 진행되어야 할 것으로 판단되며, 향후 투입된 폐콘크리트의 체계적인 품질관리와 더불어 파쇄장치 및 고속회전충격식 비중분리장치 등의 꾸준한 개선을 통해 순환잔골재 건식생산기술에 의해서도 고품질 순환잔골재의 생산이 가능한 것으로 사료된다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2000년도 제1회 학술대회 논문집
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• pp.77-78
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• 2000

We verified the charged static electricity on LCD glass influences upon the etching uniformity of dry etching process by plasma. In the TFT-LCD manufacturing process, we mainly paid attention to eliminate the static electricity for TFT reliability. The static electricity caused the serious ununiformity of etching surface profile and etching rate in the dry etch process. Through our experiment on the made static electricity from -200V to -1000V, it was confirmed that the static electricity on LCD glass caused the etching rate variation of $1.5%{\sim}15%$. We recommend the etching process equipment for LCD manufacturing have to establish the soft X-ray exposure module system for eliminating the static electricity inside the loading and unloading chamber.