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이재일,이채문,정융호,이득우 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
Mechanical micro-engineering is an easy and cheap way to fabricate micro-structures. If the application of the conventional machining method using flat-end mill becomes available for the micro-manufacturing process, it will be advanced as an extension of the conventional machining process. In this study, micro-grooves cutting using flat-end mill(φ8) was performed. The characteristics on flat-end milling was investigated to improve machinability of micro-grooves. The experiments were performed according to variations of spindle revolution, depth of cut, and feed rate. Machinability through various cutting conditions was evaluated by surface geometry, tool wear, and cutting force. The results show that micro V-grooves of width(pitch) 297/μm were acquired by flat-end milling. The maximum and minimum roughness of the wall of grooves was 438 and 67 nm, respectively.
초음파 진동절삭을 이용한 평면 광도파로와 유리의 미세 홈 가공특성에 관한 연구
이준석,김병국,정융호,이득우 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
Recent years, optical components' are widely used in optical communication industry for high speed and mass storage data processing. Micro grooving of planar lightwave circuit and glass, those are widely used in optical component, are realized by polycrystalline diamond tool with ultrasonic vibration. To know the characteristics of brittle materials cutting, ultrasonic vibration cutting tool and machining system are built for the experiment. Grooving on planar lightwave circuit and glass experiments are performed and their shape are measured by photograph with microscope. It reveals that better groove shape with low chipping of planar lightwave circuit and glass are obtained by micro grooving machining with ultrasonic vibration. These experiments are considered as a possibility to the micro grooving of optical communication components.
권동희,박진효,김정석,김병민,정융호,강명창 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
As demands for micro parts are on the increase in recent industries such as aerospace, biomedical, electronics, environment, information technology and display, the need for manufacturing such parts is also increasing. Major methods of manufacturing micro parts are based on semiconductor process technology such as lithography and etching and non-traditional machining using lasers, ultrasonic, ion-beams or electrical discharge. However, these methods require lots of time, workpiece materials are limited, and such methods are only applicable to the machining of two-dimensional shapes. Therefore, mechanical machining methods are required for the manufacturing of micro parts with complex shapes. This paper presents an investigation on the characteristics for micro groove machining by using the ultrahigh-speed air turbine spindle, and verifies the properties of mechanical method in fabricating molds for micro barrier ribs. As a result, the optimal machining condition could be found from the investigation of surface roughness according to the kinds of burr shapes in the fabricating of iron mold by using micro endmill.
정융호(Yoong-Ho Jung),소범식(Bum-Sik So),여경동(Kyong-Dong Yeo) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
본 논문에서는 5축 고속가공에 대한 가공 시간의 명가 알고리즘을 제안하였다. 가공 시간의 정확한 예측은 공정계획과 작업 일정계획에 중요한 위치를 차지하고 있다. 컨트롤러나 공구에 대한 기술의 발전이 빠르게 진행된 것과는 대조적으로 가공 시간에 대한 평가는 아직까지 NC 데이터의 길이를 지령 이송속도로 나누고 경험적인 팩터를 곱하는 전통적인 방법을 그대로 시용하고 있다. 본 연구에서는 5축 고속가공에서 정확한 가공 시간을 평가하기 위해 5축 공작기계의 실제 이송속도에 대한 동작 특성을 고려한 알고리즘을 제안하였다. 이를 위해 먼저 가공 속도와 관련된 중요한 인자들을 정의하였으며, 이를 이용하여 5축 동시 동작에서 적용 가능한 실제 이송속도에 대한 수학적 모델을 제시하였다. 또한 5축 공작기계의 실제 이송속도에 대한 특성을 측정하여 적용함으로써 3축 가공뿐만 아니라 5축 고속 가공에서도 가공 시간을 정확하게 평가할 수 있는 알고리즘을 개발하였다.