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양동열(Dong-Yol Yang),이상호(Sang-Ho Lee),안동규(Dong-Gyu Ahn),김효찬(Hyo-Chan Kim),박승교(Seung-Kyo Park) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
An effective thick-layered RP process, Transfer type Variable Lamination Manufacturing using expandable polystyrene foam (VLM-ST) has been developed to reduce building time, to decrease the stair-stepped effect of parts, to minimize post-processing with thick layers and sloping surfaces. VLM-ST employs a 4-axis synchronized automatic hotwire cutter with the parallelogram mechanism and expandable polystyrene foam sheet with the high packing density. In the VLM-ST process, a material in the form of a plate is cut into a Unit Shape Layer (USL) with thick layers and sloping surfaces by a 4-axis automatic synchronized hotwire cutter according to the cutting path data generated from a CAD model. Each USL is then bonded and built up to fabricate a 3D part. In order to examine the efficiency and applicability of the developed process, various three-dimensional shapes are fabricated on the VLM-ST apparatus.
양동열(Dong-Yol YANG),이정우(Jung-Woo LEE) 한국자동차공학회 1985 오토저널 Vol.7 No.3
The study is concerned with the investigation of curved line folding of developable surface from flat sheets of metal. General geometric relations among folding line, folded surface, fol-ded angle are derived. From the derived geometric relations,the required plastic work and punch force are derived for the first approximation. Five methods of forming are suggested and the experiment is carried out using two chosen methods for the prismatic developable surfaces of which cross-sections have 103˚arc, 180˚arc, sinusoidal shape.In the die design for the folding of prismatic developable surfaces, a stack of sheets were used to form shapes of the dies by which acceptable folded surfaces were obtained.The computed palstic work and punch force turned out to be in reasonable agreement with the experimental result.