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유공압 밸브 스풀용 강재의 관 대 봉 이종재 마찰용접의 최적화와 용접강도특성 및 AE평가
오세규(Sea-Kyoo Oh),김현필(Hyun-Pil Kim),장홍근(Hong-Keun Chang),오명석(Myeong-Suk Oh) 한국해양공학회 1997 韓國海洋工學會誌 Vol.11 No.1
The hydraulic or pneumatic valve spools became essential as the important components on the production of automatic hydraulic or pneumatic machinaries as mechanical industry has been rapidly developed. The machining precision is in necessity for manufacturing the valve spools. They could be unstable in the quality by the conventional arc welding. And also they have a lot of technical problems in manufacturing because their shapes are generally small. By the precision casting process such as lost wax process, the production cost may be increased. But by the friction welding technique, they will be able to be manufactured without such problems.<br/> This paper deals with the development of dissimilar friction welding optimization for the hydraulic or pneumatic valve spool by friction welding and a new approach of study on real-time quality evaluation by AE techniques.
유공압밸브스풀용 강재의 봉 대 봉 동종대 마찰용접의 최적화와 용접강도특성 및 AE품질 평가
오세규(Sea-Kyoo Oh),이경우(Kyung-Woo Lee),전태언(Tae-Eun Jeon),오명석(Myeong-Suk Oh),이원석(Won-Suk Lee) 한국해양공학회 1996 韓國海洋工學會誌 Vol.10 No.2
In-process quality control and high reliability of the weld are the major concerns in applying friction welding to the economical and qualified mass-production. Experimental examinations and quantitative analysis were performed for the optimization of similar friction welding of hydraulic valve spool steels(SNCM220, SCM435, SACM645, SCM415, ø 24). The quantitative correlations were found between the initial cumulative counts of acoustic emission(AE) occurring during plastic deformation periods of the welding and the fatigue life as well as weld strength and welding conditions. A real-time evaluation system was developed for the friction weld quality by AE.
자동차 크랭크 軸用 鋼材의 棒對棒 同種材 摩擦熔接의 疲勞强度 特性 및 AE 評價
오세규(Sea-Kyoo Oh),양형태(Hyung-Tae Yang),김헌경(Hun-Kyoung Kim) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.2
Nowadays, the crank shaft for motor vehicle has become essential as the important component. The machining precision was asked for manufacturing the shaft. They could be unstable in the quality by the conventional arc welding.<br/> Both in-process quality control and high reliability of the weld are the major concerns in applying friction welding to the economical and qualified mass-production. No reliable nondestructive monitoring method is avaliable at present to determine the real-time evaluation of automatic production quality control for bar-to-bar friction welding of the crank shaft of O.D. 24㎜ for motor vehicle.<br/> This paper, so that, presents the experimental examinations and statistical quantitative analysis of the correlation between the cumulative counts of acoustic emission(AE) during plastic deformation periods of the welding and the tensile strength and other properties of the bar-to-bar welded joints of O.D. 24㎜ shaft as well as the various welding variables, as a new approach which attempts finally to develop real-time quality monitoring system for friction welding, resulting in practical possiblility of real-time quality control more than 100% joint efficiency showing good weld with no micro structural defects.
( Jae-hoi Gu ),( Dong-kyoo Park ),( Dong-ju Kim ),( Sea-cheon Oh ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
Municipal solid waste (MSW) has increased significantly in the industrialized and developing countries raising the question of its sustainable disposal management. The consciousness of protecting the clean environment these days has developed various ideas to manage MSW. Gasification is a thermal process that converts a combustible material or waste into gas through partial oxidation at elevated temperature. It is one of the promising technologies which still need to be explored to make it economically feasible. The optimum operating parameters of MSW gasification was studied in this work. The pilot plant of fixed bed type gasification/melting reactor was used to analysis the effect of operating parameters for the safe production and the stability of gas composition of synthesis gas (syngas) produced from the gasification. A series of experiments have been performed to investigate the optimum operation pressure and the furnace loading rate of waste in gasifier. In this study, The composition of syngas obtained from gasification of MSW at operation pressure of 0.3-0.4 kgf/cm<sup>2</sup>G was nearly constant. It was found that with the increase of furnace loading rate of waste, the operation pressure increased while the fluctuation ratio decreased. So, it was seen that the fluctuation of furnace loading rate of waste had some effect on the system operation pressure. For the optimum operating condition for the furnace loading rate of waste was deduced as 446-545 kg/m<sup>2</sup>hr.