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성형툴의 상태에 따른 탄소섬유강화 복합재 구조물의 변형 예측
성수환 ( Su Hwan Sung ),김위대 ( Wie Dae Kim ) 한국복합재료학회 2014 Composites research Vol.27 No.6
오토클레이브 성형은 성형제품의 품질은 우수하나 생산비용이 비싸다는 단점이 있다. 생산비용 중에서도큰 비중을 차지하는 것이 성형툴의 제작공정이다. 따라서 본 연구에서는 생산비용 절감을 위한 선행 연구로서 성형툴의 재질 및 표면상태에 따라 L-shape 제품의 성형후 Spring-in을 Abaqus user subroutine을 이용하여 계산하였고, 열팽창계수와 마찰계수에 따른 결과를 나타내었다. 또한 성형툴 제작시 재질 및 표면상태의 기준점을 제시하여 생산비용을 줄이는데 기여하고자 한다. Autoclave processing has a good quality of product, but manufacturing cost is expansive. After curing ofcomposite, the unwanted deformation and distortion increase the manufacturing cost by redesign of tool parts. Therefore, manufacturing cost down is a big issue in processing level. For the reduction of tool costs, it is importantto investigate the effects of tool materials and tool surface conditions. In this paper, we organized user subroutine inABAQUS to consider the thermal effects of part and tool, and the results are compared with commercial code,COMPRO. And this paper suggests reference point for the selection of tool materials to reduce manufacturing costs.
손재환 ( Jae Hwan Son ),강해동 ( Hae Dong Kang ),성수환 ( Su Whan Sung ),권우진 ( Woo Jin Kwon ),노규익 ( Kyoo Ik Noh ) 한국경영공학회 2015 한국경영공학회지 Vol.20 No.1
We investigated if there is a quality improvement by retrofitting extrusion process for the production of environment-friendly ESP insulation that has been widely used because of its good adiabaticity and strength in this study. We could find better adiabaticity and strength, proved from the microscope investigation and thermal conductivity data of the ESP insulation produced by using environment-friendly vesicating gas of n-butane or DME. And we realized that the fluidity of the polymeric material can be improved and the carbonization can be suppressed by replacing the single screw by the twin screw. The optimal operating condition of the initial temperature of the extruding machine and velocities of the first and second screws were obtained through CFD analysis, resulting in better profiles of the pressures, temperatures and flow rates. We believe that the analysis, measurement and retrofitting methodologies in this study can contribute much to improving the extrusion process for the production of environment-friendly ESP insulation.
내부구조물을 이용한 필터의 효율 및 수명 상승에 대한 연구
김지훈(Ji-Hun Kim),윤상우(Sangwoo Yoon),권성호(Sung-Ho Kwon),성수환(Su-Hwan Sung),배문오(Mun-Oh Bae),김주한(Joohan Kim) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.5
To improve the efficiency and lifetime of filters, we analyze the element distribution at the entrance and exit by using the flow inside a filter, confirming that the internal structure affects the filter efficiency. The flow in the pipe is predicted through computer simulations, and the filtration efficiency of each element is compared through experiments. The efficiency and lifetime of the filter are indirectly improved through the element distribution at the filter outlet according to the internal structure. Because pressure loss from the structure inevitably occurs, the efficiency and lifetime of filters against pressure loss must be considered.