• Journal of the Korea Academia-Industrial cooperation Society
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• 제15권1호
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• pp.21-26
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• 2014

When iodine container for dental mouth treatment is opened, thread for treatment is cut by the blade in cap of container. Due to the problem of corrosion in a short period time after the reaction of metal blade to iodine solution, it gives impact on patient hygiene. In order to solve the problem, alternative products such as ceramic blade are developed and produced recently. In case of ceramic blade, it is produced by handwork and machine work. In this study, for the quantity production of ceramic blade with powder injection molding, we proposed a delivery system to have uniform charge of 20 cavity. Using Moldflow, simulation on 20 Cavity flow was performed. And then the mold was obtained through mold production and modification.(based on simulation) After injection molding, debinder, sintering process was achieved for ceramic blade, and the cap product was completed via insert injection on ceramic blade. In this study, we verified possibility of quantity production of ceramic blade which showed effective performance for cutting.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.246.2-246.2
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• 2010

본 연구는 저탄소 녹색성장의 국가 정책에 맞추어 주류 제조과정에서 발생하는 생전분발효 부산물인 주박(酒粕, 술지게미)을 펠릿화(pellet) 하는 것이 목적이다. 주류 제조과정에서 발생하는 주박을 100g당 물 100ml 비율로 섞어 충분히 반죽 후 녹즙기로 압축 성형화 하는 과정을 대신 하여 주박을 뽑았다. 이 주박을 온열 건조기에서 20시간이상 건조 시키면 완성이 된다. 주박펠릿은 폐기물을 재활용한 것이기 때문에 열량-가격대비를 비교해 보았을 때 등유 8950kcal-1000원/L, 경유 9050kcal-1433원/L, 면세경유 9050kcal-821/L, 우드 1812kcal-400원/kg, 주박 1989kcal-200원/kg으로 훨씬 저렴하며 열량도 높다. 주류업체에서 주박을 폐기물 처리하므로 가격 책정은 어렵다. $CO_2$ 발생량도 적어 온실가스를 절감시킬 수 있는 친환경적인 청정연료이다. 또한 연료로서 운송, 저장 및 보관이 편리하다. 주류업체도 주박 처리로 인해 연간 12억 정도 사용된다. 폐기물을 에너지화 함으로써 타 신재생에너지에 비해 초기 투자 비용이나 연료비가 저렴하다. 그리고 태우고 남은 회분은 토양개량제로 다시 재활용 되기 때문에 무해백익하다. 현재 폐목재를 사용한 우드펠릿은 원료를 수입해야 한다는 점과 삼림자원의 부족시 문제가 발생할 수 있다. 그리고 폐목재를 분쇄한 후 가공 및 성형을 해야 하기 때문에 주박이 효율성이 좋다. 현재 세계에서 가장 많이 사용되고 있는 석유나 화석연료의 매장량이 고갈 되어가고 있다. 하지만 주박은 술이 사라지지 않는 한 계속적으로 발생하기 때문에 무궁무진하게 사용이 가능하다. 또한 주류 제조시 발생하는 주박은 바로 성형 및 가공이 용이하다. 현재 주박으로 만든 펠릿은 전 세계적으로 전무하다. 막걸리 및 전통술의 특화사업으로 주박량은 더욱 증가하고 있다. 더욱이 2012년부터 해양 투기 금지로 주박 폐기물 처리가 힘들어진다. 주박 폐기물을 펠릿화해서 에너지원으로 사용하면 해결이 된다. 주박의 에너화를 통해 재생산의 열원으로 사용되고 펠릿을 연료원과 더불어 기계적인 시스템을 개발한다면 저탄소 녹색성장인 국가 정책과 부합된 미래형 에너지가 될 것이다.

• Journal of the Korea Academia-Industrial cooperation Society
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• 제20권11호
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• pp.501-509
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• 2019

The construction of foundation piles for buildings and bridges is changing from pile driving to an injected precast pile method. The goal is to minimize environmental damage, noise pollution, and complaints from neighboring residents. However, it is necessary to develop economic piles that are optimized for precasting by a centrifugal method in terms of both the material and structural system. A reinforced joint method is proposed for reinforced concrete piles (RC piles) manufactured by centrifugal casting. A previous study concluded that the structural performance of the current joint system for RC piles could be improved by using a reinforced joint composed of extended circular band plates and studs. In this study, the structural performance of such a joint was validated experimentally by bending and shear strength measurements. The proposed joint reinforcement method showed adequate structural performance in terms of bending and shear strength. The overall load-deflection behavior is close to that of a structure without joints, so it is expected that the behavior and performance of the design can be reliably reflected in site structures.

• KIPS Transactions on Software and Data Engineering
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• 제5권12호
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• pp.635-640
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• 2016

It is important factors for a production system to get a profitable result in quality and reliability process. For this reason, there's are various type of research papers in a certain type of data acquisition and application to reliability and quality of the level of M2M devices. In general, a classification problem of slightly different signal such as sensing data is difficult to do with classical statistical methods. There's required real-time and instantaneous calculation properties in machine process. Especially a type of injection molding machine which has a property to be decided in accordance with short-term cycle process needs a solution that can be done a certain type of decision like as good or bad quality immediately. This paper presents a simple application of Kalman Filtering by single sensing data to injection molding process in order to get a correct answer from the real time sensing data.

• Journal of the Korean Society for Precision Engineering
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• 제33권1호
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• pp.23-29
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• 2016

In this paper, a real-time condition diagnosis system for the lens injection molding process is developed through the use of LabVIEW. The built-in-sensor (BIS) mold, which has pressure and temperature sensors in their cavities, is used to capture real-time signals. The measured pressure and temperature signals are processed to obtain features such as maximum cavity pressure, holding pressure and maximum temperature by the feature extraction algorithm. Using those features, an injection molding condition diagnosis model is established based on a response surface methodology (RSM). In the real-time system using LabVIEW, the front panels of the data loading and setting, feature extraction and condition diagnosis are realized. The developed system is applied in a real industrial site, and a series of injection molding experiments are conducted. Experimental results show that the average real-time condition diagnosis rate is 96%, and applicability and validity of the developed real-time system are verified.

• Transactions of the Korean Society of Mechanical Engineers
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• 제17권6호
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• pp.1465-1477
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• 1993

Powder Injection Molding(PM) is an advanced and complicated technology for manufacturing ceramic or metal products making use of a conventional injection molding process, which is generally used for plastic products. Among many technologies involved in the successful PIM, injection molding process is one of the key steps to form a desired shape out of powder/binder mixtures. Thus, it is of great importance to have a numerical tool to predict the powder injection molding filling process. In this regard, a finite element analysis system has been developed for numerical simulations of filling process of powder injection molding. Powder/polymer mixtures during the filling pro cess of injection molding can be rheologically characterized as Non-Newtonian fluids with a so called yield phenomena and have a peculiar feature of apparent slip phenomena on the wall boundaries surrounding mold cavity. Therefore, in the present study, a physical modeling of the filling process of powder/polymer mixtures was developed to take into account both the yield stress and slip phenomena and a finite element formulation was developed accordingly. The numerical analysis scheme for filling simulation is accomplished by combining a finite element method with control volume technique to simulate the movement of flow front and a finite difference method to calculate the temperature distribution. The present study presents the modeling, numerical scheme and some numerical analysis results showing the effect of the yield stress and slip phenomena.

• Journal of the Korea Academia-Industrial cooperation Society
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• 제3권1호
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• pp.1-4
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• 2002

A short shot is a molded part that is incomplete because insufficient material was injected into the mold. Any factors that increase the resistance of polymer melt to flow or prohibit delivery of sufficient material into the cavity can cause a short shot. Inappropriate injection pressure is one of the most common factors which cause a short shot. Conventionally, domain experts in injection molding decide and modify the pressure based on their experience. It is difficult for a non-expert to decide the pressure properly with the considerations such as a part dimension, shape, and other processing variables. In this study, fuzzy algorithm is proposed to standardize the empirical determination of the pressure so that not only the experts but also non-experts can find the appropriate injection pressure easily. To acquire the more accurate results. domain experts should be interviewed and then technical documents which are collected from the experts should be restored in the fuzzy rule base. But in this study, simulations have been done by using C-MOLD to settle the rule base because it takes much time and also it's difficult to meet and interview the experts.

• Journal of the Korean Society for Precision Engineering
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• 제31권7호
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• pp.615-622
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• 2014

Copper pipes have been widely used as components of System Air-Conditioner due to high thermal conductivity. This system consists of 150 pipes, which are approximately 10m long in total. Dimensional changes occur during pipe processing such as expansion, reduction and bending. This processing induces changes in length of pipes and makes dimensional differences from original pipes. The summation of the differences of pipes components leads to make huge cumulative dimensional differences. The cumulative differences can cause serious problems such as crack, refrigerant leakage. However the differences have not been considered so far. To satisfy target quality of the system, it is essential to predict and calibrate the differences. In this paper, the changes in dimension were predicted using FEM and it was found that cumulative differences could cause indesirable stress during assembly process. As a result, dimensional differences or indesirable stress could be reduced using the proposed method.

• Journal of the Institute of Electronics Engineers of Korea SC
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• 제45권6호
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• pp.60-66
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• 2008

The operating voltage of Li/SOCl2 battery decrease immediately when we give a load battery stored for long time. It is called voltage delay. We cannot rapidly operate equipment at emergence situation because the voltage delays. So we have to overcome voltage delay. We reported the results improved voltage delay in this paper through the control of the carbon cathode forming density. It is the classic method in order to control of voltage delay that is coating polymer in the lithium surface or put in the additive to electrolyte. If the carbon cathode forming density decreases, the operating voltage of battery becomes to increasing because solution resistance of battery reduce.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 춘계학술대회
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• pp.288-290
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• 2005

고분자전해질 연료전지는 자동차, 분산전원 및 이동전원 등에 대한 차세대 에너지원으로 채택 가능성이 높아지고 있다. 고분자전해질 연료전지 시스템의 상용화를 위한 가장 큰 걸림돌 중 한 가지로 가격문제를 들 수 있는데, 연료전지 스택이 전체 가격의 약 $50\%$를 차지하고 있다. 또한 스택을 구성하는 요소 중 분리판의 가격 비중은 약 $30\%$를 차지하고 있어, 분리판의 생산단가 저감은 연료전지의 상용화를 위해 반드시 해결해야 될 문제이다. 본 연구에서는 탄소를 재료로 하는 분리판에 대한 연구를 수행하였으며, 압축성형방식으로 제작된 다양한 복합재료 분리판 및 흑연 분리판에 대한 기계적 강도, 물리적 특성, 화학적 안정성을 조사하였으며, 가흑 운전 시 분리판내에 함유되어있는 고분자 성분의 침출에 의한 연료전지의 성능변화가 발생하는지 확인하였으며 이에 대한 단위전지의 성능평가를 수행하였다. 이러한 결과를 토대로 최적의 압축성형 복합체 분리판 제작 방향을 제시하고, 보다 신뢰성 있는 분리판 성능평가 기준을 확립하고자 하였다.