• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 춘계학술대회 논문집
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• pp.434-439
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• 1995

본 논문에서는 선삭가공을 부품에 대한 가공 특징형상 추출 알고리즘을 개발하였다. 면저, 설계 특징형상과 가공 특징형상 을 효율적으로 나타내기 위한 데이터 구조를 설계하고, 선삭가공에 사용되는 가공 특징형상의 특성을 검토하였다. 이러한 특성 을 이용하여 주사선(Scan Line)과의 교점으로부터 가공 특징형상을 이루는 요소를 검색하고, 검색된 구성요소를 이용하여 가공 특정형상을 구성하였다. 본 연구에서 개발된 알고리즘은 기존에 사용되어 왔던 패턴비교 방법에서 주어지 패턴이외의 특징 형상을 추출하기가 어렵고 계산 시간이 많이 걸리는 단점을 극복하였다. 또한 기존의 방법으로는 해결되기 어럽던 가공 특징 형상 의 간섭의 검출에서 효율적으로 적용됨을 확인하였다.

• 한국공작기계학회논문집
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• 제12권3호
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• pp.75-81
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• 2003

Pocket machining is metal removal operation commonly used for creating depressions in machined parts. Numerically controlled milling is the primary means for machining complex die surface. These complex surfaces are generated by a milling cutter which removes material as it traces out pre-specified tool paths. To machine, a component on a CNC machine, part programs which define the cutting tool path are needed. This tool path is usually planned from CAD, and converted to a CAM machine input format. In this paper I proposed a new method for generating NC tool paths. This method generates automatically NC tool paths with dynamic elimination of machining errors in 2$\frac{1}{2}$ arbitrary shaped pockets. This paper generates a spiral-like tool path by dynamic computing optimal pocket of the pocket boundary contour based on the type and size of the milling cutter, the geometry of the pocket contour and surface finish tolerance requirements. This part programming system is PC based and simultaneously generates a G-code file.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2002년도 금형가공 심포지엄
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• pp.61-67
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• 2002

The present work is investigated optimal design for the injection molding process of a hand brake cover. The viscoelastic flow through a hand brake cover shape in the mold were calculated and compared with the experimental data. Numerical analysis reasonably predicted the general performance i.e hold pressure, cooling time and hold pressure time. In order to determine optimal process parameters, Numerical analysis and experiments have been performed for various process conditions. In this study, we obtained to increase in the productivity by $160\%$ by optimal process conditions.

• 대한기계학회논문집
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• 제18권1호
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• pp.93-100
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• 1994

5-axis CNC machining is being used in the manufacturing of tire mold, screw, and turbine blade because it can produce complex workpiece more efficiently and accurately than 3-axis CNC machining does. However, it is difficult to calculate the CL data in 5-axis CNC machining. This paper describes an efficient method to modify and edit the NC code and a data structure for representation of the workpiece produced by 5-axis CNC machining. Wireframe display of tool path and shading display of workpiece are used to represent verification results. Machining errors can be evaluated quantitively using the data structure based on the workpiece data model. The methods are implemented in a program with a IBM-PC and MS-Windows.

• Journal of Advanced Marine Engineering and Technology
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• 제20권2호
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• pp.83-83
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• 1996

Recently, for enhanced productivity the induction of CAD/CAM is vigorous. Most of high-level CAD/CAM systems produce powerful faculties. But it is very expensive to purchase the system in small and difficult to be operated by non-experienced workers effectively. Then the resonable CAM system for these is needed. In this study we developed a proto-type of the CAM system for CNC lathe connecting with personal computer. This system is configured with interactive menu windows for easy control of CNC lathe. And the system supports tool path generation for cutting conditions of workpiece. The performance of this system is satisfactory.

• Journal of Advanced Marine Engineering and Technology
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• 제20권2호
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• pp.15-23
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• 1996

Recently, for enhanced productivity the induction of CAD/CAM is vigorous. Most of high-level CAD/CAM systems produce powerful faculties. But it is very expensive to purchase the system in small and difficult to be operated by non-experienced workers effectively. Then the resonable CAM system for these is needed. In this study we developed a proto-type of the CAM system for CNC lathe connecting with personal computer. This system is configured with interactive menu windows for easy control of CNC lathe. And the system supports tool path generation for cutting conditions of workpiece. The performance of this system is satisfactory.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.551-554
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• 2002

The paper discusses new approach for machining operation simulation using enhanced Z map algorithm. To extract the required geometric information from NC code, suggested algorithm uses supersampling method to enhance the efficiency of a simulation process. By executing redundant Boolean operations in a grid cell and averaging down calculated data, presented algorithm can accurately represent material removal volume though tool swept volume is negligibly small. Supersampling method is the most common form of antialiasing and usually used with polygon mesh rendering in computer graphics. The key advantage of enhanced Z map model is that the data structure is same with conventional Z map model, though it can acquire higher accuracy and reliability with same or lower computation time. By simulating machining operation efficiently, this system can be used to improve the reliability and efficiency of NC machining process as well as the quality of the final product.

• 한국정밀공학회지
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• 제16권8호
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• pp.59-70
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• 1999

This paper deals with automated computer-aided process planning by which designers can determine operation sequences even if they have little experience in the design of press working products. The computer-aided process planning in hot forging, deep drawing and blanking requires many kinds of technical and empirical skills based on investigation and collection of the knowledge of their processes. An approach to the CAPP system is based on the knowledge-based rules and the process knowledge base consisting of process planning rules is built. The methodology adopted to develop the system is elaborated in this paper. This system has been written in AutoLISP on the AutoCAD with a personal computer and provides powerful capabilities for process planning of hot forging, cold forging, deep drawing and blanking products.

• 대한기계학회논문집
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• 제17권5호
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• pp.1074-1083
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• 1993

본 연구에서 제시된 방법은 Fig.2(c)에 나타낸 방법으로 공구궤적의 검증과 더불어 NC공구궤적의 잘못된 부분과 정도를 찾아내 수정할 수 있도록하여 기존의 NC검증시스템의 비효율성을 해결하고자 했다.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2009년도 추계학술발표대회
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• pp.46.2-46.2
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• 2009

휴대전화, 랩톱 컴퓨터 등 각종 모바일기기 및 디스플레이 기기의 경박단소화 및 고기능화에 따라 연성회로기판(FPCB)의 사용량이 증가하고있다. 연성회로기판의 핵심소재인 동박적층필름(FCCL)은 폴리이미드필름과 접착층, Cu 층으로 구성되는데, 이 중접착층으로 사용되는 Ni-20Cr합금은 에칭공정 후 Cr의 잔류에 의해 불량률 증가가 문제되고 있어, Ni-Cr합금 스퍼터링 타깃의 Cr 함량 저감 또는 Cr-free Ni합금 개발 등이 요구되고 있다. 본 연구에서는 차세대 FCCL 본드층에 적합한 Ni기 합금을 개발하기 위한 기초연구로써 Cr 함량 및 가공열처리조건에 따른 미세조직과 집합조직 변화를 조사하였다. 4N급의 고순도Ni과 Cr을 진공 플라즈마 용해장치로 용해하여Ni-xCr (x=5, 10, 15, 20wt.%)합금 잉곳을 만들고, 이를 두께감소율 90%로 냉간압연한 후, $600^{\circ}C$ 및 $800^{\circ}C$에서 10~120분 동안 어닐링하여 시편을 준비하였다. 광학현미경으로 미세조직을 관찰하고, Micro-Vickers 경도시험을 통해 어닐링 조건에 따른 경도변화를 조사하였다. 또한 SEM-EBSD를 이용하여 집합조직 및 입계특성을 분석하였다. $600^{\circ}C$ 어닐링 시 Cr함량이 증가할수록 재결정 완료시간이 증가하여 Ni-20Cr합금의 경우 2시간이상 어닐링에도 재결정이 일어나지 않았다. $800^{\circ}C$ 어닐링 시 10분 어닐링 조건에서 4종류 합금 모두 재결정이 완료되었으며, 동일한 어닐링 조건에서 Cr함량이 증가할수록 결정립이 작아지는 것으로 나타났다. $800^{\circ}C$ 2시간 어닐링 조건에서 Ni-5Cr 합금의 주요 집합조직은 {223}<113>과 {122}<112>로 나타났으며, 이중 {223}<113>은Cr 함량이 증가함에 따라 점차 {122}<112>에 가까운 방향으로 변화되어 Ni-20Cr 합금의 경우 {123}<112>만이 형성되었다. 이러한 집합조직의 변화는 적층결함에너지 감소에 의한 ${\Sigma}3$ 입계의 분율 증가와 밀접한 관련이 있는 것으로 사료된다.