• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1994년도 추계학술대회 논문집
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• pp.958-968
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• 1994

This paper presents a dynamic analysis of the high-speed spindle system for vertical machining center using finite techniques. The computed natural frequencies are compared with the measured frequencies obtained from experimental modal analysis. The results show that the bending and twisting deformations of the spindle housing dominate in the lowest modes owing to low dynamic stiffness of the housing structure. The design parameters in the analysis are : (a) panel thickness of the housing (b ) height of the housing, and (c) spindle-to-column distance of the housing. Through sensitivity analysis and optimizing simulation considering design constraints, an optimal design of the spindle system has been obtained.

• 전산구조공학
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• 제4권3호
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• pp.48-50
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• 1991

산업전반에서 전산화와 자동화의 추세가 점차로 가속화되고 있는 이 시점에서 건축설계를 전문으로 하는 업체에서의 COMPUTER의 응용과 실무에서의 적용은 이제는 전혀 새롭다거나 놀랄만한 일로 보여지지 않는 시기가 도래하였다고 보여지며, 현재는 누가 얼마나 현실적인 사용에 바탕을 둔 응용 및 개발전략으로 생산성의 향상과 업무의 효율화를 꾀하고 있는가 하는 것이 중요한 문제로 부각되어지고 있다. 주지하는 바와 같이 건축설계를 전문으로 하는 업체에서의 전산조직은 CAD와 구조계산, 견적을 그 주축으로 하고 있으며, 가장 많은 투자와 개발이 이루어지고 있는 분야이기도 하다. 따라서 본 회사의 전산조지과 그 운용에 관한 논의는 위의 각 분야별로 사용장비 및 인원구성, 현재의 이용현황, 향후 투자 및 개발계획 등을 간략하게 소개하는 것으로 대신하겠다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2003년도 가을 학술발표논문집 Vol.30 No.2 (2)
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• pp.103-105
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• 2003

ebXML은 UN/CEFACT와 OASIS가 주축으로 제정한 전자상거래 표준으로 XML 기반의 인프라를 제공하여 글로벌 e-비즈니스가 가능하도록 하는 것을 목적으로 한다. 최근 여러 ebXML 레지스트리간의 Cooperation이 중요해지면서 2003년 6월에 제정된 ebXML RIM(Registry Information Model) 버전 2.5와 ebXML RS(Registry Service) 버전 2.5 스펙**에서는 Federation, Object Relocation, Object Replication을 포함하는 레지스트리 간의 Cooperation 기능과 더불어 Content-based 질의, Event Notification, Iterative 질의와 같은 기능들이 새로 추가되었다. 따라서. 본 논문에서는 ebXML 버전 3.0 레지스트리를 구현하기 위해서 ebXML 버전 3.0 레지스트리의 시스템 구조를 설계하였으며, 버전 3.0에서 가장 중요한 기능인 Federation을 효율적으로 관리하는 방안을 분석, 설계하고 사용자가 보낸 Federation에 대한 질의를 처리하기 위한 알고리즘을 설계하였다.

• 한국기계가공학회지
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• 제14권2호
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• pp.127-133
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• 2015

In this study, an analytical model was developed for one-dimensional finite element analysis (1D FEA) of a spindle system of machine tools and then implemented to automate the FEA as a tool. FEA, with its vibration characteristics such as natural frequencies and modes, was performed using the universal FEA software ANSYS. VBA of EXCEL was used to provide the programming environment for its implementation. This enabled graphic user interfaces (GUIs) to be developed to allow interactions of users with the tool and, in addition, an EXCEL spreadsheet to be linked with the tool for data arrangement. The language of ANSYS was used to develop a code to perform the FEA. It generates an analytical model of the spindle system based on the information at the GUIs and subsequently performs the FEA based on the model. Automation helps identify the near-optimal design of the spindle system with minimum time and efforts.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.86-89
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• 2005

Design and estimation of a spindle system which was composed of grinding spindle and regulating spindle for the centerless grinding of ferrule was performed and prototypes of each spindle were manufactured. Loop stiffness of the spindle system was 130 N/${\mu}m$. Although the value was lower than the target value of 150 N/${\mu}m$, as there included 20% of the safety factor, it was enough to machine the ferrule. Rotational accuracies of each spindle were about 0.2${\mu}m$ at the primary speed of 2,300 rpm(grinding spindle) and 300 rpm(regulating spindle). Temperature rises at the same speed were about $4.4\;\~\;4.7^{\circ}C$ in the case of grinding spindle and $1.8^{\circ}C$in the case of regulating spindle, which were well agreed with the designed value. From these results, it was estimated that the prototype of spindle system had a enough performances for the centerless grinding machine to machine the ferrule.

• 한국정밀공학회지
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• 제19권2호
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• pp.213-219
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• 2002

A cone-shaped active magnetic healing spindle system for high speed internal grinding with built-in motor that has 7.5kW power and maximum rotational speed of 50,000 rpm is designed and built. Using cone-shaped AMB(Active Magnetic Bearing) system, the axial rotor dick and magnets of conventional 5-axis actuating design can be eliminated. so this concept of design provides a simple magnetic bearing system. In this paper, the cone-shaped electromagnets are designed by magnetic circuit theory, and a de-coupled direct feedback PID controller is applied to control the coupled magnetic bearings. The designed crone-shaped AMB spindle system is built and constructed with a digital control system, which has TMS320C6702 DSP, 16 bit AD/DA, switching power amplifier and gap sensors. As the AMB system provides high damping ratio eliminating overshoot and resonance speed, this spindle runs up to 40,000 rpm stably with about 5${\mu}{\textrm}{m}$ of runout.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2002년도 추계학술발표논문집 (하)
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• pp.1749-1752
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• 2002

최근 들어 B2B 기반의 전자상거래 프레임워크로 UN/CEFACT 과 OASIS 를 주축으로 하는 ebXML과 Microsoft, IBM, Ariba를 포함한 기업과 단체를 주축으로 하는 웹 서비스가 대두되고 있다. 이들은 모두 사용자 및 어플리케이션들이 정보를 저장하고 이를 공유할 수 있는 Registry 를 기반으로 서비스를 제공하고 있으며, 이를 위해 ebXML 은 ebXML Registry를, 웹 서비스는 UDDI Registry를 이용한다. ebXML 과 웹 서비스는 서로 다른 Registry 를 사용하고 있지만, Registry 를 사용하고 있지만, Registry 의 구조와 기능은 유사하거나 동일한 부분이 많다. 본 논문은 이에 착안하여 서로 유사하거나 동일한 역할을 가진 ebXML RIM의 구조와 UDDI의 데이터구조를 매핑함으로써, ebXML RIM 상에 UDDI 데이터구조를 표현하는 규칙을 찾고, 이를 이용하여 UDDI Registry Client의 서비스 요구를 ebXML Registry 를 이용하여 처리하는 UDDI Registry Server 를 설계한다. 이는 ebXML Registry 에 별도의 변경을 가하지 않고도 UDDI Registry Client 가 ebXML Registry 를 사용할 수 있게 한다.

• 한국기계가공학회지
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• 제10권5호
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• pp.20-25
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• 2011

In this paper, we reviewed the spindle system's motor and bearing and its mode safety for optimal design of a high speed spindle system that exceeds DmN value of 1,500,000. We could verify that it has a separation margin during critical speed by performing critical speed analysis. Also, we have selected an optimal sensoring installation location and actually manufactured & installed the sensor by identifying the stress concentration position in the axial load through finite element analysis to install the built-in piezo electric type load sensor to the spindle housing that can measure and monitor the machining load during high speed rotation of the spindle. Reproducibility is also verified by calibrating the error through the sensor's sensitivity adjustment after comparing the output between the plate dynamoneters and the load sensor to confirm the reproducibility of the load sensor.

• 한국공작기계학회논문집
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• 제13권5호
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• pp.38-48
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• 2004

Recently the use of high-speed equipment in machine-tool industry has greatly increased, which requires the development of prognostics and prediction methods on the design stage. Conversion of the test/experiments stage from real to virtual reality will not only significantly reduce the design and manufacturing cost, but will also increase design quality. This paper shows how it is possible to develop the automated system for the design calculations of the air-bearing spindles. First, the general calculation method is introduced. It contains several steps, namely, geometry identification, pressure calculation, stiffiness calculation, dynamics characteristics calculation. For geometry identification reducing spindle shaft to rings was proposed, which helps to automate the calculation process. For pressure calculation the Peshti method was implemented. For stiffiness calculation the analysis was made, which shown the necessity of correct calculation step selection. Then the system of ordinary differential equations containing influence coefficients was evolved, which is used for trjectories calculation. The graphical representation of the calculation results shows the dynamic behavior of the spindle unit concerning various working conditions. Finally, this automated system is illustrated by an example of the air-bearing spindle calculation.

• 한국정밀공학회지
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• 제22권11호
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• pp.142-150
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• 2005

Design and performance evaluation of a spindle system which was composed of a grinding spindle and a regulating spindle for the centerless grinding of ferrule were performed in this paper. Layout and details of spindle system were designed and hydrostatic bearings for spindles were also designed. Prototype of spindle system was developed and its availabilities to machine the ferrule were discussed using the experimental results on the spindle stiffness of each spindle, loop stiffness, rotational accuracy and thermal characteristics. Loop stiffness of the spindle system was $130\;N/{\mu}m$, which was enough to machine the ferrule. Rotational accuracies of each spindle were about $0.2{\mu}m$ at the primary speed of 2,300 rpm(grinding spindle) and 300 rpm(regulating spindle). Temperature rises at the same speed were about $4.4\~4.7^{\circ}C$ in the case of grinding spindle and $1.8^{\circ}C$ in the case of regulating spindle, which agreed well with the designed value. From these results, it was estimated that the prototype of spindle system had enough performances for the centerless grinding machine to machine the ferrule.