• Ecology and Resilient Infrastructure
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• 제8권4호
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• pp.194-203
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• 2021

최근에 상하수관로, 지역난방 열공급관로 등의 유지보수가 증가하면서, 도로절단기에 의한 도로절단 작업도 급증하고 있다. 이러한 도로절단 작업은 소음과 함께 분진(절단슬러지)을 많이 발생시키므로, 저소음, 분진회수 등 친환경적인 기술이 적용될 필요가 있다. 기존에 이러한 문제점을 해결하고자 분진을 회수하는 장비가 개발된 사례가 있으나, 친환경성이 정량화되지 않았다는 한계가 있었다. 이에 본 연구에서는 소음 및 분진과 같은 환경위해요인의 발생원인을 근본적으로 제거할 수 있는 저소음·분진회수형 도로절단기를 개발하고, 이 절단기로 수행하는 도로절단작업 과정에 대한 친환경성을 평가하였다. 이를 위하여 본 연구에서는 진공장치와 슬러지흡입부로 구성된 수냉-슬러지회수 통합시스템을 개발하고, 개발된 시스템을 도로절단기에 적용하였다. 그리고 개발된 장비를 테스트 베드에 적용하고, 친환경성 관련 데이터를 수집하여, 친환경성을 평가하였다. 평가 결과, 개발된 장비의 절단슬러지 회수율은 83% 이상이었으며, 소음도는 82~83 dB, 음향파워레벨은 115 dB 수준이었다. 본 연구의 결과는 향후 도로절단기를 개선하는 과정에서 절단슬러지 회수성능과 저소음 성능을 향상시키는 데에 기초자료로 활용될 예정이다.

• 한국기계가공학회지
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• 제14권2호
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• pp.121-126
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• 2015

In this research, a tool was developed for the rapid performance of three-dimensional finite element analysis (3D FEA) of a machine tool spindle system made of a shaft and bearings. It runs the FEA with data, such as the bearing stiffness and the coordinates of the points, to define the section of the shaft, bearing positions, and cutting point. developed for the spindle system and then implemented with the tool using an object-oriented programing technique that allows the use of the objects of the CAD system used in this research. Graphic user interfaces were designed for a user to interact with the tool. It provides rapid evaluation of the design of a spindle system, and therefore, it would be helpful to identify a near optimal design of a spindle system based on, say, static stiffness with design changes and, consequently, FEA.

• 대한기계학회논문집
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• 제11권6호
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• pp.1005-1013
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• 1987

For the factory automation and unmanned machine operation, it is very important to manufacture highly reliable and efficient chip breakers for optimal chip control. In this research, using the CALMA CAD/CAM SYSTEM, the manufacturing process of 3-dimensional chip breakers is established. Using the results of the cutting test of the selected chip breakers with double-step grooves, the chip breaking mechanism is schematically analysed. An expression for the chip breaking relation is derived which considers chip material behavior following LUDWIK's stress-strain curve, chip breaking criterion and the shape of chip breakers. This contains the thickness of chip, the radius of chip curl, and the mechanical properties of chip materials. It is found that the expression agrees very closely with the experimental results.

• 패션비즈니스
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• 제2권2호
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• pp.46-53
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• 1998

The purpose of this study is to survey and analyze the conditions and automation of sewing machines and thereby, address the problems and their solutions to help local sewn products enhance their international competitiveness. The results of study can be summarized as follows : 1. It was found that most of the sample companies were getting smaller scale or pettier in terms of capital, number of employees or scale of factory. The interest in facility investment was relatively higher, which suggests high interest of our sewing companies in facility investment. 2. Most of the sample companies were well equipped with the essential and several auxiliary sewing machines, but poorly equipped with the special or automated sewing machines. 3. The ratio of idle machines was highest in sewing work, compared with cutting or finishing work, primarily due to decreased orders, aging machines or reduced manpower.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1993년도 추계학술대회 논문집
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• pp.70-75
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• 1993

Chatter vibration is an unwanted phenomenon in metal cutting and it always affects surface finish, tool life machine life and the productivity of machining process. The In-process monitoring & control of chatter vibration is necessarily required to automation system. In this study, we constructed the multi-sensing system using Tool Dynamometer,Accelerometer and AE(Acoustic Emission) sensor for the credible detection of chatter vibration. And a new approach using a neural network to process the features of multi-sensor for the recognition of chatter vibration in turning operation is proposed. With the back propagation training process, the neural network memorize and classify the feature difference of multi-sensor signals.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2003년도 춘계학술대회 논문집
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• pp.19-22
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• 2003

경사의 사선방향으로 절단하여 봉제된 바이어 컷 직물로 제조된 의류는 일반 의류와 달리 우아한 외관을 타나낸다. 이 직물의 단점은 형태안정성이 나빠서 완전제품의 형태가 패턴의 형의 형태와 다른 모양을 나타내는 경우가 많으며, 특히 밑단 부분이 불균일하게 쳐지므로, 가지런히 절단하는 트리밍공정을 부가적으로 거치게 된다. 현재의 봉제 공정에서는 트리밍 단계를 모두 숙련공들의 수작업에 의존한 평면 커팅 방법으로 수행하기 때문에 작업자의 피로도에 따라 불량품이 양산되고 그에 따른 소비자들의 불만 요인도 높아지므로, 본 연구에서는 치수 조절 마네킹을 제조하여 실제 의복 착용 상태를 그대로 재현 한 후, 회전시키면서 스스로 회전하는 자동 커터에 의해서 공간상에서 트리밍 하는 3-D 입체 시스템을 개발하였다. 이 시스템에 의하여 제조된 의류는 트리밍 라인이 균일하고 매끄러우며, 안감이 밖으로 밀려나오는 경우가 없어 외관상 품위가 있는 외관을 나타내었다. 또한 수작업에 비하여 제조 속도가 훨씬 빠르므로 봉제 후공정에서의 의류 제조 시간을 획기적으로 단축하는 신속 생산 시스템의 요소로서 충분히 사용될 수 있는 가능성을 나타낸다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.271-275
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• 1995

Chip control is a major problem in automatic machining process, especially in finish operation. Chip breaker is one of the important factors to be determined for the scheme of chip control. As unbroken chips are grown, there deteriorate quality of the surface roughness and process automation can be carried out. In this study, to get rid of chip curling problem while turning internal hole, optimal chip breaker is selected form the experiment. The experiment is planned with Taguchi's method that is based on the orthogonal arrary of design factor. From the respose table, cutting speed, feedrate, depth of cut, and tool geometry are major factors affecting chip formation. Then, optmal chip breaker is selected and this is verified good enough for chip control from the experiment.

• Architectural research
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• 제15권1호
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• pp.1-8
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• 2013

Over the past two decades following the 1990s, South Korea's IT industry has developed rapidly. In keeping with this trend, the architectural and urban planning sectors have also converged with IT and achieved advancement in new directions. This evolution includes a variety of conceptual terminologies such as 'home automation', ''home network', 'smart home, and 'ubiquitous-city'. However, smart homes and U-cities simply represent a conceptual extension of home networks, and there is little real difference in the technologies involved. In particular, U-cities remain focused on infrastructure rather than on the development of specific content; consequently, they have failed to demonstrate distinctive features to clearly differentiate themselves from conventional cities. In such a context, this research aims at the proposal of a 'ubiquitous pavilion' as a component of the efforts to develop a range of architectural contents that utilize ubiquitous technologies. By grafting the pavilion, one of the most basic forms in architecture, with cutting-edge ubiquitous technologies, this paper intends to suggest a multi-purpose architectural space readily and simply available not only in newly emerging U-cities, but to conventional cities as well.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2000년도 춘계학술대회
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• pp.241-248
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• 2000

Increased complexity of products and their manufacturing processing demans higher quality control and monitoring than ever before. Therefore, flexible automatization or flexible manufacturing systems (FMS) offer numerous advantages over alternative manufacturing methods. In this state, a in-process monitoring is one of the important flexible automation system. And as use of NC and CNC machine tool has been increasing, cutting work has automating and it is necessary to develop the automatic production system combined a couple of machine tool. Thus, in this paper to search examination it can measure the tool wear and the tool life and can be more practical research subject.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2000년도 추계학술대회 논문집
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• pp.86-89
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• 2000

In cold forging by multi stage former, crowing process is important process for the high production rate and automation of forging process. But various cropping defects occur in cropping process such as orthogonality, ovality and unevenness, etc. These defects have harmful effects on the dimensional tolerance of products and tool life. So in this study, the cropping experiment is performed to examine influence of cropping process variables(clearance, cutting velocity, H/D) on occurrence of crowing defects and optimum process variables are selected, and then FE analysis is performed to verify influence of these defects on dimensional tolerance and tool life.