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판재의 드로우비드 성형시 비드표면처리와 비드형상이 인출 및 마찰특성에 미치는 효과
이동활 ( Dong Hwal Lee ),류종수 ( Jong Soo Ryu ),정우창 ( Woo Chang Chung ),문영훈 ( Young Hoon Moon ) 한국열처리공학회 2005 熱處理工學會誌 Vol.18 No.2
N/A In sheet metal forming, drawbeads are often used to control uneven material flow, which may cause defects such as wrinkles, fractures, surface distortion and springback. Appropriate setting and adjusting of the drawbead force is one of the most important parameters in sheet forming process control. Therefore in this study, drawbead test was performed at various bead surface treatment conditions to clarify the frictional characteristics between sheet and drawbead. Furthermore, the differences in drawing force between circular and rectangular shape beads have also been measured to estimate the effectiveness of bead shape on the material flow control. The results show that drawing and friction characteristic were strongly influenced by surface treatments of bead and bead shapes.
거리측정에서의 초음파 신호 검출 분해능 개선에 관한 연구
이동활(Dong-Hwal Lee),안희태(Hee-Tae An),백광령(Kwang-Ryul Back),이만형(Man-Hyung Lee) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.10
We proposed a new measuring method for long-range distances with a high-resolution by ultrasonic sensor. The ultrasonic transmitter and receiver arc separated but synchronized. This proposed method is able to detect the range signal from received signal including serious noises. We experimented distance measuring by the proposed method, and then evaluated roughly in various distance case. From the experiments, we arc confident that the proposed method is able to expand the detecting range and also improve the resolution. From the result, we are to apply the method to a wide-range detecting technique required high precision.