• 한국정밀공학회지
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• 제28권8호
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• pp.886-893
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• 2011

To increase the reliability and positional accuracy of a machine tool, a novel capacitive displacement sensor having a cylindrical shape is presented to measure the axial displacement of a machine tool spindle. Characteristics of the sensor were analyzed by numerical simulation. The sensor was built into a specific machine tool spindle and its performance was experimentally investigated. The accuracy of a thermal error compensation system of a machine tool can be enhanced greatly using proposed sensor.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.547-548
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• 2011

• 한국기계가공학회지
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• 제14권2호
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• pp.121-126
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• 2015

In this research, a tool was developed for the rapid performance of three-dimensional finite element analysis (3D FEA) of a machine tool spindle system made of a shaft and bearings. It runs the FEA with data, such as the bearing stiffness and the coordinates of the points, to define the section of the shaft, bearing positions, and cutting point. developed for the spindle system and then implemented with the tool using an object-oriented programing technique that allows the use of the objects of the CAD system used in this research. Graphic user interfaces were designed for a user to interact with the tool. It provides rapid evaluation of the design of a spindle system, and therefore, it would be helpful to identify a near optimal design of a spindle system based on, say, static stiffness with design changes and, consequently, FEA.

• 제어로봇시스템학회논문지
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• 제12권6호
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• pp.600-607
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• 2006

For the effective operation of manufacturing system, FMS(Flexible Manufacturing System) and CIM(Computer Integrated Manufacturing) system are developed. In these systems, a machine tool is the target of integration in last 3 decades. In nowadays, the conventional concept of machine tools is changing to the autonomous manufacturing device based on knowledge-evolution through applying advanced information technology in which open architecture controller, high speed network and internet technology are contained. In this environment, a machine tool is not the target of integration but the subject of cooperation. In the future, a machine tool will be more improved in the form of a knowledge-evolution based device. In order to develop the knowledge-evolution based machine tools, this paper proposes the structure of knowledge evolution in M2M(Machine To Machine) and the scheme of a dialogue agent among agent-based modules such as a sensory module, a dialogue module, and an expert system. The dialogue agent has a role of interfacing with another machine for cooperation. To design the dialogue agent module in M2M environment, FIPA-OS and ping agent based on FIPA-OS are analyzed in this study. Through this, it is expected that the dialogue agent module can be more efficiently designed and the knowledge-evolution based machine tools can be hereafter more easily implemented.

• 한국생산제조학회지
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• 제20권6호
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• pp.703-713
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• 2011

In this study, to minimize trial and error in the design and manufacturing processes of a high-precision large-surface micro-grooving machine which is able to fabricate the molds for 42 inch LCD light guide panels, the effects of the structural deformation of the micro-grooving machine according to the positions of the X-axis, Y-axis and Z-axis feed systems were examined on the tool tip displacement errors associated with the machining accuracy. The virtual prototype (finite element model) of the micro-grooving machine was constructed to include the joint stiffnesses of the hydrostatic bearings, hydrostatic guideways and linear motors, and then the tool tip displacement errors were measured from the virtual prototype. Especially, to establish the prediction model of the tool tip displacement errors, which was constructed using the positions of the X-axis, Y-axis and Z-axis feed systems as independent variables, the response surface method based on the central composite design was introduced. The reliability of the prediction model was verified by the fact that the tool tip displacement errors obtained from the prediction model coincided well those measured from the virtual prototype. And the causes of the tool tip displacement errors were identified through the analysis of interactions between the positions of the X-axis, Y-axis and Z-axis feed systems.

• 한국정밀공학회지
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• 제32권5호
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• pp.447-454
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• 2015

Design and application of hardware-in-the-loop simulation (HILS) for design of CNC-controlled machine tool feed drives is discussed. The CNC machine tool is a complex mechatronics system where the complexity results from the software-based controller composed of a variety of functionalities and advanced control algorithms. Therefore, using a real CNC controller in the control simulation has merits considering the efforts and accuracy of the simulation modeling. In this paper challenges in HILS for a CNC controlled feed drive, such as minimization of time delay and transmission error that are caused by discretization of the feed drive model, is elaborated. Using an experimental HILS setup of a machine tool feed drive applications in controller gain selection and CNC diagnostics are presented.

• 한국산학기술학회논문지
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• 제2권1호
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• pp.19-30
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• 2001

공작기계는 산업발전의 기초가 되며 그 나라 기술수준을 반영하는 디자인 가공, 제어, 조립 등과 같은 분야에서 고도의 기술력을 요구하기 때문에 기계류 부품의 생산성 향상 및 품질향상에 큰 영향을 주게된다. 그러나, 국내업체의 경우 능숙한 기술자나 공작기계 개발을 위한 충분한 자본의 확보가 어려워 선진 공작기계 제조업체와의 기술적 차이를 극복하기가 어려운 실정이다. 따라서, 이 논문은 국내의 공작기계 업체가 안고있는 문제점들을 인식하고 국제 경쟁력의 향상을 위해서 국·내외 공작기계 회사의 현 상태 및 연구경향 등을 조사하여 국내 공작기계 업체를 지원하기 위한 국가차원에서의 종합적인 연구개발과제를 도출하고자 한다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2005년도 춘계학술대회 논문집
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• pp.288-293
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• 2005

A earn profile grinding machine is a mandatory machine tool for manufacture of high precision contoured cam. Experimental evaluation of modal analysis is an effective tool to investigate dynamic behavior of a machine. This paper presents the measurement system and experimental investigation on the modal analysis of a grinding machine. The weak part of the machine is found by the experimental evaluation. The results provide structure modification data for good dynamic behaviors. And safety of the machine was confirmed by the modal analysis of modified machine design. Finally, the cam profile grinding machine was successfully developed.

• 한국융합학회논문지
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• 제12권9호
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• pp.161-168
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• 2021

복합가공기 분야에서 고속 및 고정밀화에 대한 요구가 늘어남에 따라 복합가공기의 강성과 진동에 관한 관심이 증가하고 있다. 그러나 경험에 의존한 설계로 인해 개발 시간이 많이 소요되며 적절한 설계에도 어려움이 많아 공작기계 설계에 구조 최적화 FEM의 활용이 많아지고 있다. 그러나, 현재 구조물의 응력 분포를 통한 최적화를 주로 활용하고 있어 구조물의 진동 상태를 고려하여 최적화하기에는 어려움이 있다. 본 논문에서는 5축 복합가공기에서 가공에 가장 많은 영향을 끼치는 헤드 구조물의 최적화를 위하여 유한요소해석을 활용한 정적 구조해석, 모드 해석, 가진 주파수 해석을 진행하였으며, 도출된 응력 분포, 변형, 고유진동수, 가진 주파수 그래프를 활용하고 적절한 목적함수와 설계변수를 설정하여 정강성과 동강성을 모두 고려한 위상 최적화 해석 방법을 제시하고자 한다.

• 대한기계학회논문집A
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• 제21권12호
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• pp.2134-2145
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• 1997

We present a framework of an intelligent design system for embodiment design of machine tools which can support efficiently and systematically the machine design by utilizing design knowledge such as objects(part), know-how, public, evaluation, and procedures. The design knowledge of machining center has been accumulated through interview with design experts of machine tool companies. The processes of embodiment design of machining center are established and represented by the IDEF0 model from the field surveys. We also introduce a hybrid knowledge representation so that the system can easily deal with various and complicated design knowledge. The intelligent design system is being developed on the basis of object-oriented programming, and all parts of a design object, machining center, are also classified by the object-oriented modeling.