• 한국융합학회논문지
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• 제2권2호
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• pp.27-34
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• 2011

본 연구는 호빙 가공공정 없이 워엄 휠 기어 형상을 만들기 위한 워엄 휠의 개발을 위한 제품을 만드는 것이다. 호빙 가공 공정이 없기 때문에, 증가된 생산성과 등가의 품질을 가지는 플라스틱 워엄 휠이 결국 만들어지게 된다. 그 결과, 이 제품은 현대 모비스, 만도, TRW, KOYO/NSK/Showa(Japan), Delphai(Amercia)에 판매 될 것이다. 핵심 기술 및 전략은 다음과 같다. 워엄 휠의 성형을 위한 기술 보호는 최근 "헬리컬 기어(No. 10-2008-0105908) 성형"이 특허 공정으로 되어 있다. 나아가, "보스 삽입을 위한 위치 결정을 위한 성형 시스템"을 위한 특허 절차가 준비 중이다. 기어 기계가공 절차 없이 호빙 머신에 기어 성형 절차로서, 무엇보다 먼저, 기어를 만드는 코어 개발 기술이 주된 주제이다. 따라서, 코어 및 성형 기초가 초기 순서로 개발되지 않아서, 현재 개발되는 워엄 휠의 경우, 기어는 이차적으로 호빙 M/C로 기계가공 된다. 최종적으로는, 성형 기초 구조체를 위한 특허가 본 연구결과로 만들어질 예정이다.

• 한국산학기술학회논문지
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• 제16권9호
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• pp.5737-5742
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• 2015

인서트 사출 성형은 용융 플라스틱을 인서트가 삽입된 금형에 주입하는 공정이다. 사출 과정 중에 인서트는 용융 플라스틱이 가하는 압력에 의해 변형될 수 있다. 인서트의 변형은 인서트 주변의 유로 폭을 변화시키고, 이것은 미성형이나 성형품의 뒤틀림 같은 심각한 결함을 야기시킬 수 있다. 인서트의 변형을 감소시키기 위해서는 게이트 시스템, 인서트 형상, 성형 조건 등을 성공적으로 설계해야 한다. 본 연구에서는 BLDC 모터 고정자의 사출 성형 시 발행하는 인서트의 변형을 수치해석을 통하여 분석하였다. 인서트 변형을 감소시키기 위하여 게이트 위치와 인서트 형상을 수정하였다. 마지막으로, 수정된 설계로 사출 성형을 수행하고, 변형이 감소되었음을 확인하였다.

• 한국전자파학회논문지
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• 제18권12호
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• pp.1359-1369
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• 2007

본 논문은 이동 위성 관제 시스템을 위한 적응 배열 안테나 시스템에서 위성의 위치 파악과 빔 성형 기법에 관하여 서술한다. 이동시 위성 관제를 수행하려면 이동체에 대한 위성의 상대적 위치를 실시간적으로 파악하여 적응형 어레이 안테나 주 빔(main beam)을 위성으로 향하게 하여 위성 관제를 수행하여야 한다. 이를 위해서 고 해상도 전파 방향 탐지 알고리즘 중의 하나인 MUSIC(Multiple Source Idetification) 알고리즘을 사용하였고, 이에 대한 성능 분석과 아울러 구현시 위상 변환기의 양자화에 따른 영향에 대하여 분석하였다. 본 논문은 위상 배열 안테나를 이용하여 이동 위성 관제 시스템을 구현할 수 있음을 보여줌으로써 국내의 이동 위성 관제 시스템을 개발에 중요한 자료가 될 수 있다.

• 정보저장시스템학회논문집
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• 제3권3호
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• pp.149-153
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• 2007

Perpendicular patterned magnetic media have been regarded as a prime candidate to achieve an ultra-high magnetic recording density of over 1 Tera-bits/$inch^2$. Patterned magnetic media with nanoscale patterns have been fabricated using various nanopatterning technologies. We focused on the two technical issues of nanoinjection molding technology. Firstly, we have investigated a cost-effective method to fabricate metallic stamps. Secondly, we focused on the analysis of nanoinjection molding with passive heating, where the replication of 50 nm nanopillar arrays was successful. The effect of the thermal insulation layer on the replication quality was examined by analytical and experimental methods. Finally, we deposited a magnetic layer on a injection molded nanopillars and measured. Our methodology can provide cost-effective mass-production for patterned magnetic media.

• 한국정밀공학회지
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• 제31권7호
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• pp.591-596
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• 2014

Augmented reality is a novel human-machine interaction that overlays virtual computer-generated information on a real world environment. It has found good potential applications in many fields, such as training, surgery, entertainment, maintenance, assembly, product design and other manufacturing operations. In this study, a smartphone-based augmented reality system was developed for the purpose of monitoring and managing injection molding production lines. Required management items were drawn from a management content analysis, and then the items were divided into two broad management categories: line management and equipment management. Effective work management was enabled by providing those working on the shop floor with management content information combined with the actual images of an injection molding production line through augmented reality.

• 유공압시스템학회논문집
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• 제8권4호
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• pp.1-8
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• 2011

Injection molding machine is the assembly of many kinds of mechanical and fluid power part and electro-electronic control system. From in these, fluid power is a part where becomes the first core of this machine. Fluid power systems of injection molding machine are modelled and analyzed using a commercial program AMESim. The analysis model which is detailed about the parts applied a publishing catalog data. Sub system models which is divided according to functional operation are made and its analysis results shows how design parameters work on operational characteristics like displacement, pressure, flow rates at each node and so on. Total fluid power circuit model is also made and analyzed. The results made by analysis will be used design of fluid power circuit of injection molding machine.

• 유공압시스템학회논문집
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• 제8권4호
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• pp.24-31
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• 2011

Double-color Injection molding machine is the assembly of many kinds of mechanical, fluid power part and electric electronic control system. From in these, fluid power is a part where becomes the first core of this machine. Fluid power systems of double-color injection molding machine are modelled and analyzed using a commercial program AMESim. Partial system models which is divided according to functional operation are made and its analysis results shows how design parameters work on operational characteristics like pressure, flow rates, displacement at each node and so on. Analysis modeling and compared the data which gets from experiment and the analysis result which has a reliability got data. The results made by analysis will be used design of fluid power circuit for developing a double-color injection molding machine.

• 한국기계가공학회지
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• 제15권1호
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• pp.95-102
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• 2016

Wrinkle, spring-back, and fracture are major defects frequently found in the sheet metal forming process, and the reduction of such defects is difficult as they are affected by uncontrollable factors, such as variations in properties of the incoming material and process parameters. Without any countermeasures against these issues, attempts to reduce defects through optimal design methods often lead to failure. In this research, a new multi-attribute robust design methodology, based on the Mahalanobis Taguchi System (MTS), is presented for reducing the possibilities of wrinkle, spring-back, and fracture. MTS performs experimentation, based on the orthogonal array under various noise conditions, uses the SN ratio of the Mahalanobis distance as a performance metric. The proposed method is illustrated through a robust design of the sheet metal forming process of a cross member of automotive body.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.723-726
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• 2001

The design of delivery system is one of the most important subject in injection molding. Delivery system is a channel to flow the polymer melt from the injection molding machine to the mold cavities and affect quality and productivity of the part. The synthesis of delivery system of injection molding has been done empirically, since it requires profound knowledge about the moldability and causal effects on the properties of the part, which are not available to designers through the current CAD systems. A knowledge-based CAD system is constructed by adding the knowledge module to an existing geometric modeler and contains knowledge to permit non-experts ad well as mold design experts to generate the acceptable geometries of gate and runner for injection molded parts.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1999년도 춘계학술대회논문집
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• pp.213-217
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• 1999

An expert system is developed for rational and efficient design of multi-component injection molding which is a fairly new manufacturing technique to produce plastic parts by injecting two or more materials sequentially using multiple injection units in a single machine into a single rotary mold. The knowledge base used in the present design system is primarily composed of two parts ; knowledge from domain expert and knowledge from CAE analysis. The present expert system has hour main modules ; general design guidelines for injection molding specific guidelines for multi-component injection molding redesign guidelines from the result of the CAE analysis and finally troubleshooting for multi-component injection molding. To show the validity of the present design methodology two shop floor design problems were tested ; design and fabrication of timing belt cover and power window's assist knob by using multi-component injection molding.