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김종봉(J.B.KIM),이동우(J.W.YOON),윤정환(D.W.LEE),양동열(D.Y.YANG) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
2D finite element analysis for the drawbead forming and drawing was carried out. The present study is concerned with the element behavior in bending dominant deformation. In order to investigate the behavior of a 4-node bilinear element and a 9-node quadrilateral element in the tensile mode and in the bending mode, the simple tensile deformation and the transverse shear deformation were analysed. Also, the drawbead forming and drawing was analysed using the two types of elements. The comparison of the computations with the experiments sbows that the 9-node element is more effective than the 4-node element in bending dominant processes.<br/>
3 차원 표면의 컬러 인쇄를 위한 공정 변수 영향 분석에 관한 연구
송민섭(M. S. Song),이상호(S. H. Lee),김효찬(H. C. Kim),양동열(D. Y. Yang) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
In the present industry, three-dimensional colored shape has required for realistic prototype in rapid manufacturing. Zcorporation developed 3D printer which can color three-dimensional prototype but this process can’t be adopted to other rapid prototype products and spend much time and cost coloring 3D shape. In this study a new coloring process on threedimensional surface is proposed for realistic prototype. Three-dimensional surface coloring apparatus is composed of HP ink jet head and X-Y plotter. Distance and angle between ink jet nozzle and 3D surface are set as process parameter. Based on the experiment of process parameters, it is shown that distance and angle affected on printed image on 3D surface. Circle and line shape are chosen as standard image shape because the shape has widely used as standard in 2D printing. Consequently, the distorted image on 3D surface is corrected by transformed input image data.
열 공구를 이용한 쾌속 폼 가공 공정 개발에 관한 연구
김효찬(H. C. Kim),이상호(S. H. Lee),송민섭(M. S. Song),양동열(D. Y. Yang),박승교(S. K. Park) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Recently, life cycle and lead-time of products have been shortened with the demand of customers. Therefore, it is important to reduce time and cost at the step of manufacturing trial molds. In order to realize three dimensional shape on CAD, the machining process has been widely used because it offers practical advantages such as precision and versatility. However, traditional machining process spends a lot of time in cutting product and the remained material causes trouble such as inconvenience for clean. In this work, a new machining process using the hot tool has been proposed to overcome those limitations. In the process, the hot tool moves the predetermined path and the heat of the tool decomposes the remained material. In order to set up the process, the hot tool to satisfy requirements is designed and the material thermal properties are obtained using the DSC and TGA machine. The relationships between process parameters and thermal radius of the tool are obtained through experiment.