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차체 C/Pad 조립을 위한 증강현실 기반의 조립시스템 구현
박홍석(Hong Seok Park),최흥원(Hung Won Choi),박진우(Jin Woo Park) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.8
Nowadays, the increasing global competition forces manufacturer to reduce the cost and time for implementation of manufacturing system. The AR(augmented reality) technology as a new human-machine interface introduces a noteworthy perspective for a new manufacturing system design. Using AR technology, a physically existing production environment can be superimposed with virtual planning objects. Therefore, the planning tasks can be validated without modeling the surrounding environment of the production domain during short process planning time. In this paper, we introduce the construction of AR browser and determine the optimal environment parameters for field application of AR system through lots of tests. And, many methods such as multi-marker coordinate system, division of virtual objects and so on, are proposed in order to solve the problems suggested from initial field test. Based on these tests and results, the test-bed of C/Pad assembly system is configured and robot program for C/Pad assembly is generated based on AR system.
차체 사이드 패널 조립을 위한 디지털 레이저용접 셀 구현
박홍석(Hong Seok Park),최흥원(Hung Won Choi),강무진(Mu Jin Kang) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.5
Because of the turbulent markets and the increasing demand on product quality, the application of new technology to practice is increasingly important. In case of automotive industries, they take interest in laser welding to solve these problems because laser welding has many advantages such as good accessibility, welding quality, fast welding speed and so on. To apply this technology to welding of car body, the data of laser welding are collected through lots of the experiment according to the material, geometry and layer number of welding points. Based on the experiment results and the information of product, i.e. the car side panel, the clustering of stitches for laser welding was carried out and the optimal equipments are selected through the comparison between the requirements of welding and the potential of equipments. Using these results, laser welding cell for the car side panel are configured with the concept of the digital manufacturing, which ensures maximum planning security with visualization and simulation. Finally, the optimal laser welding cell is chosen by the evaluation of alternative cells with assessment criteria.
박홍석(Hong-seok Park),최흥원(Hung-won Choi),강무진(Mu-jin Kang),이희범(Heui-bom Lee),장인성(In-sung Chang),이현동(Hyeoun-dong Lee),최병욱(Byung-wook Choi) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.10
Nowaday, the increasing global competition put much pressure on increasing the efficiency and quality at all stage in the life cycle of manufacturing systems e.g., (re)design, implementation and operation. To increase efficiency, there is need to minimize the time and cost for development and operation of a manufacturing systems. Therefore, it becomes more and more to important to analysis and test a manufacturing system before a large investment.<br/> In this paper, we introduce procedure for digital manufacturing and OLP for high efficiency. And. according to these procedures, we implement a virtual laser welding cell using IGRIP and CATIA V5 as an example.
사출금형용 고탄소강(HP4MA)의 레이저열처리 특성에 관한 연구
황현태(Hyun-Tae Hwang),최흥원(Hung-Won Choi),김종도(Jong-Do Kim) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.5
Recently, lots of automobile part manufacturers try to increase glass fiber content of their plastic parts to improve strength and impact-resistance. For this reason, injection mold requires high hardness and wear-resistant. Laser surface treatment is used to improve characteristics of wear and to enhance the fatigue resistance for injection mold. In this paper, high carbon steel (HP4MA) for injection mold material was heat-treated to harden surface by using high power diode laser (HPDL). To find the process parameters for laser surface treatment of HP4MA, many experiments are carried out as changing the parameters of surface temperature and travel speed of laser. From the results of the experiments, it has been shown that the maximum average hardness is approximately 711∼739 Hv when the temperature and the travel of laser are 1,050℃ and 2 mm/sec.