한국정밀공학회:학술대회논문집 (Proceedings of the Korean Society of Precision Engineering Conference) (Proceedings of the Korean Society of Precision Engineering Conference)
한국정밀공학회 (Korean Society for Precision Engineering)
- 반년간
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- 2005-8446(pISSN)
과학기술표준분류
- 기계 > 정밀생산기계
한국정밀공학회 2009년도 춘계학술대회 논문집
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This study is focused on the thickness change in burring with stainless 409L according to the change of main design variables and forming conditions, to manufacture the automobile exhaust flange. Large plastic deformations by burring process decreases thickness of inner radius and occurs cracks. The optimal design of performs by the finite element analysis achieves adequate improvement of thickness decrease.
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On-demand ejection of ultra-fine droplets that uses both electrohydrodynamic (EHD) force and mechanical actuation is presented. The liquid meniscus was controlled by a piezoelectric actuator and droplets were ejected by EHD force. Through these effects, it was possible to obtain a high operational jetting frequency of 5kHz with a short delay-time (about 50 us) when compared with existing on-demand EHD jetting methods, such as the pulsating jet mode (3-10 msec) and the pulsed-voltage cone-jet mode(3.6 msec). Also, we obtained ultra-fine droplets at a volume that was at the femto-liter level simultaneously. The jetting characteristics were examined for both hydrophobicity and hydrophilicity of the surface of a capillary.
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