• 한국CDE학회논문집
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• 제7권2호
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• pp.102-109
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• 2002

This paper presents a method for automatic generating of check sheet to measure deep-drawn sheet metal. By using polyhedral model of CAD, the proposed procedure calculates measuring points automatically. The results of measure are exported to MS-Excel. The proposed method is implemented by API functions and C language using SPEED plus CAD/CAM system and MS-Window OLE.

• 한국인터넷방송통신학회논문지
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• 제16권6호
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• pp.277-285
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• 2016

현재의 운영감리는 정량적 접근방법이 아니라 감리인의 주관적 판단에 의존하고 점검항목을 어떻게 적용할지는 감리인 재량에 따라 편차가 크다. 이러한 관점은 감리인의 전문성에 따라 보다 상황에 맞게 적정한 점검이 이루어지는 기회가 되기도 한다. 하지만 시스템 구축 보다 시스템 운영에 있어서는 맞지 않는 것이 현실이다. 운영시스템은 구축후 지속적인 운영이 필요한 시스템으로 운영감리 때마다 다른 점검항목을 적용한다면 감리결과에 대한 신뢰성을 확보할 수 없고, 감리결과의 활용도 제한적이 될 수밖에 없다. 이에 본 논문에서는 정보시스템 운영 상태를 정량화된 운영점검표로 측정하도록 함으로써 운영감리를 개선시키고, 그 효용성을 높이고자 한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1087-1090
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• 2005

In precision machinery systems for medical and chemical applications, micropumps with a low pulsation have been demanded and investigated for accurate delivery of a small amount of liquid. This study proposes sheet type check valves instead of ball type check valves for PZT pumps and performs some tests on dynamics characteristics of check valves having different design parameter with variable frequency. The selected materials of check valves is NBR, PP film, Polyimide and Stainless steel(SUS304). In the experiment, dynamic characteristics of stainless steel thin plate have better performance than others.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1442-1445
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• 2003

In precision machinery industry, it's required with small size and low noise design to using in constant liquid delivery equipment. To accomplish it's purpose, we designed the check valve with rubber sheet of circle shapes as a possible assembly in pump body. The test equipment for piezoelectric pump was able to test pressure-flow property and output property of piezoelectric pump by variation(magnitude of voltage and frequency) of input power.

• 한국산업정보학회논문지
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• 제22권6호
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• pp.95-105
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• 2017

본 연구는 중소기업들의 경쟁력을 증대하기 위하여 평가진단 체크시트 모델을 개발하는 것이다. 평가진단 체크시트 개발 절차는 사전조사(주력기업 조사, 업종특징 분석. 핵심기능 선정 등), 연구개발(핵심기능 체크시트 개발, 핵심기능 향상도구 개발)순으로 진행하였다. 평가모델은 5개 부문(비전과 전략체계, 품질보증과 제품안전, 현장관리 수준, 통계적 공정관리, 개선활동)으로 대별한 후, 각 부문별로 1)인식, 2)체계, 3)운영, 4)검토 및 보완의 4가지 내용으로 구분하여 구성하였다. 본 평가모델은 특히 지방자치단체 내에 산재해 있는 중소기업 중에서 주력 중소기업을 선정하여 집중 육성하는데 많은 기여를 하게 될 것으로 기대되며, 이를 통해 해당 중소기업의 경쟁력이 향상될 것으로 판단된다.

• 한국정밀공학회지
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• 제15권3호
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• pp.18-23
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• 1998

This paper describes a research work of developing a computer-aided design of blanking and piercing for irregular-shaped sheet metal products. An approach to the CAD system is based on the knowledge-based rules. Knowledge for the CAD system is formulated from plasticity theories, experimental results and the empirical knowledge of field experts. The system has been written in AutoLISP on the AutoCAD with a personal computer and is composed of four main modules, which are input and shape treatment, flat pattern layout, production feasibility check, and strip layout module. Based on knowledge-based rules, the system is designed by considering several factors, such as radius and angle of bend. material and thickness of product, complexities of blank geometry and punch profile, and availability of press. This system is capable of unfolding a formed sheet metal part to give flat pattern and automatically account for the adjustment of bend allowances to match tooling requirements by checking the dimensions and relationships of parts of the folded product. Also this system can carry out a process planning which is obtained from results of irregular shape of product that was successful in production feasibility check module according to flat pattern layout and generate strip layout drawing in graphic forms. The developed system provides its efficiency for flat pattern layout, and strip layout for the irregularly shaped sheet metal products.

• 소성∙가공
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• 제6권5호
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• pp.416-424
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• 1997

In the present study, a contact search and check algorithm for general tool surface described by triangular FE patch is proposed. To improve numerical stability, SEAM element using the linear Coons interpolation has been used. To check the proposed algorithm, both clover cup and L-shape cup deep drawing processes are calculated. The computed results shows that the proposed contact algorithm can be successfully applied for sheet metal forming processes with general shaped tools.

• 소성∙가공
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• 제19권4호
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• pp.236-241
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• 2010

The frictional behavior of bare steel sheet highly depends on surface roughness. It was investigated that the change of surface roughness of bare steel sheet due to deformation for each forming mode. The flat type friction test was done to check the effect of surface roughness change on frictional characteristics of bare steel sheet. As increasing the deformation, the Ra value was increased at stretching forming mode and drawing forming mode, however the change of Pc showed different trends. The Pc was decreased as increasing stretch deformation but increased at compression deformation. At drawing forming mode, the friction coefficient was increased as deformation was increased after initial big drop with drawing oil. As deformation was increased, the friction coefficient was decreased with drawing oil at stretching forming mode. The results show that the deformation changes the surface roughness and frictional characteristics of steel sheet but the effect depends on the forming mode.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2002년도 춘계학술대회 논문집
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• pp.173-176
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• 2002

Viscoplastic deformation and sheet forming behavior of multicomponent Zr-based bulk metallic glass alloy has been investigated. From a series of mechanical test results, basic processing maps based on Dynamic Materials Model have been constructed to establish feasible forming conditions. Stamping in laboratory scale was then performed at the various stroke speeds and temperatures using a hydraulic press. Failure in macroscopic level was examined to check the validity of constructed processing maps.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1997년도 춘계학술대회논문집
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• pp.121-124
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• 1997

In the present study, a general tool surface contac search ad check algorithm is proposed. A general tool surface is described by triangular FE mesh. To check a proposed algorithm, clover cup and L-shape cup deep drawing processes are calculated. The elastic-plastic FEM using SEAM (Shear Energy Augmented Membrane) element is adapted for numerical stability.