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탄소강 환봉의 레이저 표면변태경화 특성에 관한 연구 (II) - 빔 프로파일 차이에 따른 레이저 표면변태경화 특성 비교 -
김종도,강운주,Kim, Jong-Do,Kang, Woon-Ju 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.3
The conventional study on the laser surface transformation hardening has been carried out with a beam of the specified shape and uniform power-intensity distribution in order to ensure the uniformity of the hardening depth. Two types of beams - the circular gaussian beam and rectangular beam of the uniform power-intensity distribution were used in this study. we were supposed to optimize the process parameters and to compare the hardening results with two optics respectively. As a result, the hardness distribution of the hardened zone was similar in both cases and the hardened phase by the rectangular beam was denser than that by the circular gaussian beam.
다이오드 레이저를 이용한 탄소강 환봉의 표면변태 경화특성
김종도(Jong-Do Kim),강운주(Woon-Ju Kang),이수진(Su-Jin Lee),윤희종(Hee-jong Yoon),이제훈(Jae-Hoon Lee) 한국레이저가공학회 2008 한국레이저가공학회지 Vol.11 No.4
Laser Transformation Hardening(LTH) is one branch of the laser surface modification processes. A lot of energy is needed for the LTH process to elevate workpiece surface to temperature of the austenite transformation(A₃), which results from utilizing a beam with a larger size and lower power density comparatively. This study is related to the surface hardening for the rod-shaped carbon steel by the high power diode laser whose beam absorptivity is better than conventional types of lasers such as CO₂or Nd:YAG laser. Because a beam proceeds on the rotating specimen, the pretreated hardened-phase can be tempered and softened by the overlapping between hardened tracks. Accordingly, the longitudinal hardness measurement and observation of the micro structure was carried out for an assessment of the hardening characteristics. In addition, a hardening characteristics as a hardenability of materials was compared in the point of view of the hardness distribution and hardening depth and width.
가우시안 분포의 레이저 열원을 이용한 탄소강 환봉의 표면변태경화
김종도(Jong-Do Kim),강운주(Woon-Ju Kang),이창제(Chang-Je Lee),이제훈(Jae-Hoon Lee),서정(Jeong Suh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.10
Laser Material Processing has been replaced conventional machining systems - cutting, drilling, welding and surface modification so on. Specially, LTH(Laser Transformation Hardening) process is one branch of the laser surface modification processe. This study is related to surface hardening of rod-shaped carbon steel applied for the lathe based complex processing mechanism and contains a basic behavior of surface hardening, hardness distribution of treated sections and possibility of the surface transformation hardening used a beam with the gaussian distribution.
Nd:YAG레이저를 이용한 일체형 Steering Gear Housing의 제조에 관한 연구
김종도(Jong-Do Kim),이창제(Chang-Je Lee),강운주(Woon-Ju Kang),김유찬(Yu-Chan Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.10
The parts of automobile has been progressed quickly introduction of modulation for the simplification of assembly and improvement in a reliability of products. Consequently, modulation of steering gear is urgent needs for the monolithic housing. But a shape of the monolithic housing is accompanied easily with a welding distortion in processing. For this reason, an introduction of the laser brought a reduction of the welding distortion and made it possible to embody the jig-less welding system as synchronizing with two robots. The roundness of steering gear housing to be made in this way was about 9/100. At this time, Power control of laser is desired.