• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2001년도 춘계학술대회 논문집(한국공작기계학회)
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• pp.287-293
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• 2001

Resently, reduction of industrial products in size and weight has increased by the application of micro-drill for gadgets of high precision and gave rise to a great interest in a micro-drilling. Due to the lack of tool stiffness and the chip Packing, micro-drilling requires not only the robust tool structure which has not affected by the vibration, but also the effective drilling methods designed to prevent tool fracture from cutting troubles. Firstly, this paper presents a new manufacturing process of micro-drill for improving the Product rate and an optimum shape of micro-drill for lengthening the tool life, and secondly between tool life and drilling torque acquired in the inprocess monitoring system.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.68-71
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• 2000

A tool holder system has been designed to measure cutting forces in diamond turning. This system includes a 3-component piezo-electric tranducer. In this research, tool holder system is modeled by considering the element dividing, material properties, and boundary conditions using MSC/PATRAN. Mode and frequency analysis of structure is simulated by MSC/NASTRAN, for the purpose of developing the effective design. In addition, tool holder system is verified by vibration test using accelerometer. This system will aid to the development of Fast Tool Servo.

• 대한임베디드공학회논문지
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• 제4권2호
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• pp.84-89
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• 2009

This paper describes the development tool for applications of automotive electronic control unit based on OSEK/VDX. This development tool has a plug-in structure and is written in Java language, because of being based on Eclipse CDT. And also this development tool has another functionality of expansion, which means a special function block can be easily adopted in this development tool. Currently, this development tool consists of five blocks, which are integrated development environment block, fusing program block, system generation block, debugger block, and cross-compiler toolchain block. They have relationship between each other and work for developing OSEK/VDX-based applications. In this paper, we show the functionality of each block of this development tool and its implementation.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 추계학술대회 논문집
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• pp.1015-1018
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• 2002

Recently, many studies have been undergoing to reduce a working time in a field of machine tool. There are two ways of reducing a working time; to reduce an actual working time by heighten a speed of spindle and to reduce a stand-by time by shortening a tool exchanging time. ATC(Automatic Tool changer) belongs to the latter case. Fixed address type ATC that is being developed ill this study can store more number of tool in small space than magazine transfer type ATC relatively as well as shorten tool exchanging time. In this study, a simplified equivalent model of finite element method in order to analyze structure of fixed address type ATC.

• 한국공작기계학회논문집
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• 제11권6호
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• pp.52-59
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• 2002

Resently, reduction of industrial products in size and weight has increased by the application of micro-drill for gadgets of high precision and gave rise to a great interest in a micro-drilling. Due to the lack of tool stiffness and the chip packing, micro-drilling requires not only the robust tool structure which has not affected by the vibration, but also the effective drilling methods designed to prevent tool fracture from cutting troubles. Firstly, this paper presents a optimum characteristic evaluation method of 0.15mm microdrill in consideration of new manufacturing processes for improving the product rate and extend the tool life, and secondly suggest between microdrilling characteristic properties of tool md evaluation of workpiece quality through experiment.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2002년도 추계학술대회 논문집
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• pp.36-40
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• 2002

The development of feed drive system with high speed and accuracy has been a major issue in the machine tool industry. Linear motors can be used as the efficient tool to achieve fast feed mechanism and high accuracy. However. a high speed feed drive system with linear motors can generate heat problems such as the variation of temperature distribution and the resultant thermal stress. In this paper, the important heat sources and the resultant thermal errors are presented. The thermal deformation characteristics of the machine tool with linear motors were identified, which are thermal expansion of linear scale, shrinkage, expansion and bending in the machine tool structure.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제12권4호
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• pp.264-274
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• 2006

최근 들어 기업을 포함한 각 조직에서는 그들이 그 동안 축적한 데이타를 의미 있는 정보로써 활용하기 위해 데이타의 자유로운 포맷팅이 가능한 리포팅 툴을 의사 결정을 위한 데이타 분석 툴로서 확대 사용하고자 하는 요구가 증가하고 있다. 기존에는 하나의 동적 문서에 대해서 다수의 조회자가 발생하는 성격의 동적 문서들을 생성 및 배포하기 위하여 리포팅 툴을 사용해 왔다. 이러한 용도에 적합하도록 기존의 리포팅 툴은 서버 측에서 동적 문서의 생성을 담당하는 구조를 취하고 있다. 또한 서버 프로그램은 동적 문서의 미리 생성, 정기적 갱신 등을 담당하는 스케줄러와 반복된 생성을 피하기 위한 캐쉬 기능을 통하여 효율적 운영을 꾀하고 있다. 그러나 데이타 분석 용도의 동적 문서의 생성은 다수의 조회자를 고려한 동적 문서의 생성이 아니며 사용자가 다양한 값의 파라미터를 입력하는 방식으로 짧은 시간 간격으로 반복적인 동적 문서의 즉시 생성을 요구하는 특정이 있다. 이와 같이 리포팅 툴의 사용 범위 확대는 기존 리포팅 툴의 서버 측에 처리 부하를 증가시키고 있다. 본 논문에서는 제한된 리소스 환경에서도 대량의 데이타를 가공하여 동적 문서를 생성할 수 있는 리포트 뷰어를 통해 배포 목적이 아닌 데이타 분석 목적의 동적 문서의 경우 클라이언트 측에서 생성하도록 하여 서버의 부하를 분산시키고자 한다.

• 열처리공학회지
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• 제7권4호
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• pp.318-327
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• 1994

According to conventional nitriding of tool steels, it was very difficult to produce a high surface hardness. This study has been conducted to investigate the influence of initial structures on the nitriding characteristics of tool steels in gas-nitrided for the improvement in surface hardness. The specimens (SACM645, STD61 steels) have been quenching and tempering at various temperature and then gas-nitrided for 30, 45 and 60hr at 500, 530 and $550^{\circ}C$ respectively in gasatmosphere of 30%$NH_3-70%N_2$ As hardness of initial structure was higher, the nitriding layer was deeper and hardness of the nitriding layer was higher. Deeper nitriding layers was due to higher diffusion rate by fine initial microstructure. Also the reason of high surface hardness was associated with formation of dispersed fine carbonitrides of nitrides.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.78-81
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• 2002

To achieve high precision machine totals with high speed, it is needed to develop excellent rigidity statically, dynamically and thermally as well. In this view the chief things that thermal deformation of machine tool structure is directly related to high precision. And thermal behavior for transmission procedure have an effect on high precision. It is needed to exact temperature distribution of each members and all contact elements included for machine tool structure. This paper deals with thermal behavior caused by temperature variation in a high speed feeding process. At this procedure of temperature distribution is estimated using a Predictor-Corrector Method.

• 한국전기전자재료학회논문지
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• 제15권2호
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• pp.147-152
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• 2002

Carbon nitride thin films were deposited by reactive sputtering for the hard coating materials on Si wafer and tool steels. When the nitrogen content of carbon nitride film on tool steel is 33.4%, the mean hardness and elastic modulus are 49.34 GPa and 307.2 GPa respectively. The nitrided or carburised surface acts as the diffusion barrier which shows better adhesion of carbon nitride thin film on the steel surface. To prevent nitrogen diffusion from the film, steel substrate can be saturated by nitrogen forming a Fe$_3$N layer. The desirable structure at the surface after carburising is martensite, but sometimes, due to high carbon content an proeutectoid Fe$_3$C structure may form at the grain boundaries, leaving the overall surface brittle and may cause defects.