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온간 스파이더 표면결함 개선과 금형수명 향상에 관한 연구
강종훈(Jong-Hun Kang) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.5
Due to the complicated shape of the spider, the production method was changed from cold to warm forging. Finite element analysis was performed to predict the forging load and shape using the enclosed hydraulic die set. As the forging load increases due to the spider die volume, die stress analyses were performed to optimize the die design in order to reduce the die stress in various conditions. Large deformation while producing the complicated forging parts induces high forging load, which is one of the main parameters of the forging surface defects. The forging process was analyzed to find out the root cause of the surface defects generated during the spider production for various parameters, thereby revealing that the radius of die in the defect zone influenced the air trap depth, being the root cause of the surface defect. It was verified that die life was increased and the surface defect was eliminated by changing the die design during the mass production test.
저속 유동용 Pressure Sensitive Paint 기술개발과 응용
강종훈(Jong Hun Kang),이상준(Sang Joon Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The PSP technique has been used to measure pressure distribution on a model surface quantitatively. The<br/> objective of this study is to develop PSP technique which can be applied to low-speed flows. Four different<br/> PSP formulations including two porphyrins (PtOEP and PtTFPP) and two polymers (Poly(TMSP) and RTV-<br/> 118) were tested and the performance of each combination was checked. In the static calibration, the<br/> luminescent intensity of the PSP coatings was measured from 0kPa to 11kPa with 0.5, 1, 2kPa increments.<br/> Among 4 PSP formulations tested, the combination of PtOEP and RTV-118 shows the best performance. The<br/> PSP technique was applied to an oblique impinging jet to measure the pressure field distribution on the<br/> impinging plate.