http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
DED Additive Manufacturing Using Auto-Surface Tracking Technology
하태호(Taeho Ha),허세곤(Segon Heo),이창우(Changwoo Lee),정민교(Min-Kyo Jung),최장욱(Jang-Wook Choi) Korean Society for Precision Engineering 2023 한국정밀공학회지 Vol.40 No.3
Directed energy deposition (DED) additive manufacturing technology enhances the functionality of existing or damaged parts by adding metallic materials to the surfaces. Blown-powder DED technology utilizes a focused, high-energy source to fuse the part’s surface with the supplied metal powder. Maintaining a constant stand-off distance (SOD), the distance between the deposition head and the workpiece, is a key factor in ensuring deposition quality, as variations in SOD will change the powder focus position and the laser spot size on the surface. Therefore, traditional additive manufacturing systems require CAD or pre-scanned surface data. In this study, we proposed auto-surface tracking technology. No workpiece CAD data or pre-scanned surface data are required, and in-situ measurement and feedback control can automatically consider the deposition height differences that cause a change in SOD when depositing the next layer. The accuracy of the SOD measurements and feedback control error was verified using a step height sample. The mean SOD measurement error was 4.7 ㎛ with a standard deviation of 42 ㎛ (reference SOD, 14 ㎜). The feasibility of the autosurface tracking technology was confirmed through the additive manufacturing processes of the gear and an actual blanking mold applied in the defense and industrial fields.
하태호(Taeho Ha),송준엽(Junyeob Song),이창우(Changwoo Lee),이재학(Jaehak Lee),김천호(Chounho Kim),김종오(Jongoh Kim) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Linear vibrator is one of the core parts for a smartphone. In this study, we suggest micro-factory design for manufacturing linear vibrator. The micro-factory is designed to be consisted of four main assembly machines which are including cover assembly, weight assembly, plate assembly and total assembly. Cycle time of the factory is expected to be about 8 sec.
송준엽(Jun-Yeob Song),송은지(Unji Song),하태호(Taeho Ha),정영상(Young-sang Jung),김영규(Yeong-gyoo Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this paper, we developed the prototype of automated evaluation system for phone camera module. This full automated system is designed to be model change friendly. Also, we built a testbed to develop the system that allow great flexibility for model change not only in mechanical viewpoint and but also viewpoint of software by introducing anisotropic conductive sheet, universal cartridge and replacing model-oriented evaluation method with SMIA (Standard Mobile Imaging Architecture) based one.
Module Type 소형 폰 카메라 렌즈모듈 조립장치 개발
이창우(Changwoo Lee),송준엽(Junyeob Song),하태호(Taeho Ha),이재학(Jaehak Lee),김천호 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Micro-factory has many advantages but few examples of the commercialization. Because productivity and yield are less considered in micro-factory research. The micro-factory must also ensure productivity and yield in order to be commercialized. In this study commercialization of assembly micro-factory for phone camera lens module is a main goal.
회전형 자동 Pitch 조정 Multi Picker 개발
이창우(Changwoo Lee),송준엽(Junyeob Song),하태호(Taeho Ha),이재학(Jaehak Lee) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
Cellular phone camera lens is produced by plastic injection molding process. Plastic injection mold has the gate through that lens mold is filled by molten plastic. Mold gate destroys the lens symmetry so lens has other special quality according to the orientation. Multi picker that can control the pitch has been introduced for productivity elevation. But the multi picker can not control the rotation. In this paper multi picker for lens module assembly is designed to control lens orientation and the pitch simultaneously.
Lightweight Design of a Vacuum Gripper for Inspection Equipment Using Topology Optimization
차으뜸(Euddeum Cha),김태영(Tae-Young Kim),하태호(Taeho Ha),박근(Keun Park) Korean Society for Precision Engineering 2021 한국정밀공학회지 Vol.38 No.9
Owing to recent advances in additive manufacturing technology, design for additive manufacturing (DfAM) has been used to overcome design limitations due to constraints in traditional manufacturing processes. In this study, we applied DfAM technology to design lightweight and consolidated vacuum grippers for inspection equipment. We proposed a consolidated design to reduce manufacturing time and costs, which previously encompassed assembling eleven components. Topology optimization was used to reduce part weight while maintaining structural rigidity and safety, and two optimization models were designed: two-piece and one-piece models. Based on these optimized geometries, the internal vacuum paths were designed in a curved shape to enhance adsorption characteristics. Numerical simulations were conducted to evaluate the structural performance and flow characteristics of the initial design and the two optimization models. The pressure drop of the one-piece model, which was the best design, was reduced to 1/8 of the initial design and the structural safety factor was predicted to be 6.37. This final design was then additively manufactured by a digital light processing type 3D printer and the weight of the resulting parts was reduced from 12.94 to 2.08 g. Experimental observation found that the additively manufactured vacuum gripper showed enhanced absorption performance compared to the initial design.
부품성능 극대화를 위한 작동환경 반영 단계적 구조최적설계 프로토콜 개발
송여울(Yeo-Ul Song),송병욱(Byeong Uk Song),정민교(Min-Kyo Jung),하태호(Taeho Ha),이필호(Pil-Ho Lee) 한국생산제조학회 2023 한국생산제조학회지 Vol.32 No.4
This study presents a novel protocol to enhance the structural optimization design, considering the real manufacturing environment. Conventional manufacturing methods appear inadequate in meeting the high demand for reducing the product size while enhancing performance. Therefore, next-generation technologies will necessitate innovative techniques such as additive manufacturing and design optimization to improve part performance. Additive manufacturing has revived interest in structural optimization technology. However, most companies remain hesitant to adopt new and optimized designs owing to their unfamiliarity with the design process and fear of failure stemming from unforeseen variables. Hence, the protocol proposed in this study offers user selection options based on parametric optimization using machine learning models while incorporating existing validated designs. The expected feasibility function (EFF) provides a guide aligned with specified thresholds, such as design constraints. Topology optimization, utilizing the initial design selected in the previous step, can advance the optimization of engineering products familiar to users.