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최경현(Kyung-Hyun Choi),도양회(Yang-Hoe Doh),김형찬(Hyung-Chan Kim),김동수(Dong-Soo Kim) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
In solid freeform fabrication system (SFFS), the fabrication process mainly consists of four steps; heating powder, filling nitrogen gas, stacking sliced layers, and cooling a chamber. Among these steps, the time required for staking layers depends on a scan path generation method. When a scan path is in-line stitching type, the number of jumps will increase because of convex or concave segments of the loops and inner loops of each layer. Consequently, the scanning time is taken longer due to unnecessary jumps. To enhance fabrication time, the unnecessary jumps must be removed as many as possible. In this paper, a regional scan method has suggested by dividing specific regions at each layer. An optimal scan path will be s generated by rearranging the in-line stitching scan path after dividing each layer according to the minimal number of jumps.
최경현(Kyung-Hyun Choi),최재원(Jae-Won Choi),도양회(Yang-Hoe Doh),김동수(Dong-Soo Kim),이석희(Seok-Hee Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In SFFS, the fabrication process mainly consists of four steps; heating powder, filling nitrogen gas, stacking sliced layers, and cooling the chamber. Among these steps, the time for staking layers is up to how to generate scan path. That is, when the scan path is in-line stitching type, the number of jumps to move the start from the stop position will be increasing because of convex or concave segments of the loops and inner loops of each layer. Consequently, the scanning time is taken longer because of unnecessary jumps. For enhancement of fabrication time, the unnecessary jumps have to be removed as many as possible. To do this, a regional scan has recommended by dividing specific regions from the layer.<br/> In this paper, to reduce the number of jumps, optimal scan path was generated by rearranging the in-line stitching scan path after dividing each layer according to the minimal number of jumps.??In this paper, to reduce the number of jumps, optimal scan path was generated by rearranging the in-line stitching scan path after dividing each layer according to the minimal number of jumps.
최경현(Kyung-Hyun Choi),최재원(Jae-Won Choi),도양회(Yang-Hoe Doh),조수정(Soo-Jung Cho),이석희(Seok-Hee Lee),안영진(Young-Jin Ahn),김동수(Dong-Soo Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In SFFS(Solid Freeform Fabrication System), in order to fabricate a large part, dual laser and each scan path is needed. A scan path for dual laser is generated from single path, therefore there is divided region and discontinuous positions. Scan paths for each laser have to be synchronized and consider mechanical strength against fracture at divided region. This paper addresses generation of single laser scan path which deals with special cases for unnecessary scan points and generation of dual laser scan path according to various divided regions to enhance mechanical strength.
정전기력 분무 공정 기반 마스크 패터닝 시스템 기술 개발
최경현(Kyung-Hyun Choi),당현우(Hyun-Woo Dang),김형찬(Hyung-Chan Kim),고정범(Jeong-Beom Ko),도양회(Yang-Hoe Doh),김동수(Dong-Soo Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
An environmental-friendly spray deposition is different from commercially available deposition techniques like piezo, thermal, and aerosol. Through electrostatically controlled conductive inks, patterns can be achieved on substrate by using submicron mask. In this study a novel process of selective patterning is implemented. This paper discusses an optimized system design for analysis of process variables by electro pray deposition. Colloidal solution contained in a metallic capillary head driven by electrostatic force verified mask patterning experimentally.