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선박용 대형 후판 용접부 면취가공을 위한 절삭가공 특성에 관한 연구
조철용 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.6
There is a growing demand for improving the welding quality by reducing the machining error and improving the quality of the machined surface in the beveling for the improvement of the welding groove of the thick plate. For this purpose, it is necessary to develop an automatic beveling machine that adopts a cutting method that replaces the conventional oxygen flame cutting method. In this study, the cutting characteristics according to the machining conditions were evaluated during the face milling applied to the thick plate welding groove. We measured and evaluated cutting force for the machining conditions such as cutting depth, feed rate, chamfer angle, workpiece material, and material of the tool. We expect that this study is used as basic data for designing the stiffness of the spindle, the strength of the fixture and the power of the spindle and the feeding device when designing the automatic beveling machine.
조철용(Chul-Yong Cho),문상돈(Sang-Don Moon),류시형(Shi-Hyoung Ryu) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
Semi-finishing(중삭가공);Cusp(커습);Ball-End Mill(볼엔드밀);Tool Path(공구경로);Tool Wear(공구마모);Cutting Force(절삭력) In modem manufacturing, many products that have geometrically complicated features, including three-dimensional sculptured surfaces, are designed and produced. In the production of these complex-shaped mechanical components, e.g. automobile dies, molds, and various engineering applications, the ball-end milling process is one of the most widely used NC machining processes that consists of roughing, semi-finishing and finishing. In semi-finishing, cusps remained after roughing according to the used tools that have two patterns of stairs and wave shapes. These cusp shapes have air-cut in cutting and instability caused by high cutting speed that affects the cutting characteristics such as cutting force and tool wear. Cutting characteristics are measured and analyzed through cutting force, FFI analysis of cutting force and tool wear along cutting length according to four tool paths with same metal removal rate. As a results of the experiments, this study suggests the optimal conditions of tool path and cutting direction. This approach for the cutting characteristics of semi-finishing provides a useful aid for the productivity and efficiency improvements of NC machining processes.
조철용(Cheolyong Jo),김제동(Jedong Kim),장성은(Sung Eun Jang),최창열(Changyeol Choi),김만배(Manbae Kim) 한국방송·미디어공학회 2009 한국방송공학회 학술발표대회 논문집 Vol.2009 No.11
영상의 깊이 정보를 추출하는 것은 매우 어려운 연구이다. 다양한 유형의 영상 구조의 분석이 필요하지만 많은 경우에 주관적인 판단의 도움이 필요하다. 본 논문에서는 로스 텍스처 필터를 기반으로 정지 영상의 깊이를 자동으로 생성하는 방법을 제안한다. 로스 텍스처 필터는 단안 비전에서 3D 깊이를 얻기 위한 방법으로 활용되었는데, 실제 2D 영상에서 깊이를 예측하기 위해 텍스처 편차, 텍스처 기울기, 색상 등을 활용한다. 로스 필터는 1×5 벡터로부터 콘볼루션을 이용하여, 20여개의 5×5 콘볼루션 필터가 구해지는데, 영상에 필터를 적용하여 로스 에너지를 계산한다. 구해진 에너지를 깊이 맵으로 변환하고, 깊이 맵에서 특징 점을 구하고, 특징 점들로부터 델러노이 삼각화를 이용하여 삼각형 깊이 메쉬를 얻는다. 구해진 깊이 맵의 성능을 측정하기 위해 카메라 시점을 변경하면서 영상의 3D 구조를 분석하였으며, 입체영상을 생성하여 3D 입체 시청 결과를 분석하였다. 실험에서는 로스 텍스처 필터를 이용하는 깊이 생성 방법이 좋은 효과를 얻는 것을 확인하였다.
조철용(Cheolyong Jo),김제동(Jedong Kim),정다운(Daun Jeong),길종인(Jongin Gil),이광훈(Kwanghoon Lee),김만배(Manbae Kim) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.5
This paper describes a 3-DTIP(3-D Tour Into Picture) using depth map for a Korean classical painting being composed of persons and landscape. Unlike conventional TIP methods providing 2-D image or video, our proposed TIP can provide users with 3-D stereoscopic contents. Navigating inside a picture provides more realistic and immersive perception. The method firstly makes depth map. Input data consists of foreground object, background image, depth map, foreground mask. Firstly we separate foreground object and background, make each of their depth map. Background is decomposed into polygons and assigned depth value to each vertexes. Then a polygon is decomposed into many triangles. Gouraud shading is used to make a final depth map. Navigating into a picture uses OpenGL library. Our proposed method was tested on "Danopungjun" and "Muyigido" that are famous paintings made in Chosun Dynasty. The stereoscopic video was proved to deliver new 3-D perception better than 2-D video.