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나노초 레이저 가공에서 초음파 진동이 가공표면에 미치는 영향
강봉철,김건우,조성학,박종권,양민양,Kang, Bong-Chul,Kim, Gun-Woo,Cho, Sung-Hak,Park, Jong-Kweon,Yang, Min-Yang 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6
Conventionally, the machined surface roughness in nano-second(ns) laser machining is damaged and rough due to thermal effects. To obtain the improved surface finish, the ultrasonic vibration is applied to ns-laser machining. The ultrasonic vibration jig is developed to apply the ultrasonic high precision motion to workpieces. And then the ns-laser machining is conducted to compare the effects of the ultrasonic vibration. The results show that the surface roughness with ultrasonic vibration is smoother than that without the vibration. The phenomenon could be explained as enhancement of heat transfer by ultrasonic vibration.
김건우(Gun Woo Kim),강봉철(Bong Chul Kang),조성학(Sung Hak Cho),박종권(Jong Kweon Park),양민양(Min Yang Yang) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Compared to conventional machining processes, laser machining has advantages in machining speed and production rate. However, it is hard to avoid to generate heat-affected zone (HAZ) due to the principle mechanism of laser machining. To reduce the heat damage and improve the surface finish, ultrasonic vibration is applied to the processes like drilling, tapping, deburring, and grinding in many preceding researches. In this study, therefore, the effects of ultrasonic vibration is examined in laser machining process according to the parameters of machining condition.
극초단 펄스 레이저 가공을 위한 초음파 진동 구조물의 개발
윤진호(Jin-Ho Youn),김건우(Gun-Woo Kim),강봉철(Bong-Chul Kang),김현철(Hyun-Chul Kim),양민양(Min-Yang Yang),조성학(Sung-Hak Cho),박종권(Jong-Kwon Park) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
A vibration in the ultrasonic region is useful to various machining processes due to its distinct effect. If the ultrasonic vibration is applied to the machining, the alignment of motion is indispensible to achieve high precision and accuracy since it is possible for the moving range of vibration to be larger than the tolerance. The most of existing ultrasonic actuators, however, show isotropic motions during vibration, so it is necessary to design a new structure which has the unidirectional motion. Hence, it is required to design a structure, of which characteristic generates a dominant motion along the machining direction by constraining the other motions. In this study, a design, which satisfied above requirements, was suggested, and a prototype, was made for experiment. It was examined to verify the directional characteristics of proposed design. As a result, anisotropic motion was obtained in experiment of the prototype.
고품질 표면을 얻기 위한 초음파 응용 나노초 레이저 가공
김건우(Gun Woo Kim),윤진호(Jin Ho Youn),강봉철(Bong Chul Kang),양민양(Min Yang Yang),조성학(Sung Hak Cho),박종권(Jong Kweon Park) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
A nanosecond-pulsed(ns) laser is broadly accepted to many manufacturers due to its high productivity, but the re-deposition and agglomeration of nanoparticles deteriorate the surface quality during ns laser machining. In previous study, the ultrasonic vibration was applied to prevent this phenomenon. Even though the ultrasonic vibration effect could be detected by a scanning electron microscope (SEM), it was hard to measure the actual roughness - the numerical data - of the surface. In this study, therefore, SEM images were treated by an image processing tool (Image-Pro Plus) to translate qualitative data into quantitative forms. As a result, it was able to confirm the effects of ultrasonic effect by comparing two samples.