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조용무(Y.M.Cho),유웅재(W.J.Yoo),김재도(J.D.Kim) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This present paper deals with the characteristric of wire vibration of wire EDM by laser beam measurement. In order to mesure frequency of the wire vibration, we developed laser beam measurement using Si-photo diode. There are also presented the results of the experimental researches. The frequency of the wire vibration is varied with feed rate, wire speed, voltage and offtime. Among these parameters, wire speed is very much influenced the frequency. It is possible that the optimum condition is predicted by the developed laser beam measurement.
디젤엔진 피스톤용 SCM440 의 레이저 표면경화부의 잔류응력
이동석,유웅재,김재도 ( D . S . Lee,W . J . Yoo,J . D . Kim ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.3
SCM440, which is widely used as the diesel engine piston of vessel, has been hardened by a CO₂laser with the wavelength of 10.6㎛. Laser hardening experiment has been carried out for the condition of a laser power 1㎾, the travel speed between 0.4 and 1.5m/min, and a rectangular-Gaussian beam. Residual stress has been measured by using middle point technique of half value width of X-ray diffraction method. It was found that the compressive residual stress with the range between 400 and 600㎒ has distributed in the laser hardening zones and the tensile residual stress between 100 and 200㎒ has distributed in the boundary of hardening zones.