http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
304 스테인레스강에서 첨가원소에 따른 미세조직 및 절삭성 연구
강석순,김현철,이재현,조종래,정윤교,장철호,황호순,Kang, S.S.,Kim, H.C.,Lee, J.H.,Cho, J.R.,Jung, Y.G.,Jang, C.H.,Hwang, H.S. 한국재료학회 2006 한국재료학회지 Vol.16 No.9
To enhance the machinability of the austenite stainless alloys, Mn and S were added to form MnS in the austenite matrix. Recently, Ca is also added to increase machinability. The alloying elements, such as C, Mn, S, Ca, and Al, are known to affect machinability, but those roles are not well understood. In this study, the ingots, controlled of alloying elements, C, Mn, S, Ca, Al, were prepared in the 304 stainless steel. The relationship between microstructure and machinability was compared to understand the role of alloying elements. It was proved that Mn and S enhanced machinability but C reduced it by analyzing cutting force on machining in the lathe. The alloying elements, Ca and Al, made a complex oxide compound of Mn-S-Ca-Al-Si-O, which results in increasing tool life. The ferrite volume fraction was changed with alloying elements and the effect of the ferrite fraction on machining was also discussed.
국부가열에 의한 장축 T자형 제품의 특수단조공법의 실험적 및 수치적 연구
김봉수(B. S. Kim),강석순(S. S. Kang),류호연(H. Y. Ryu),한광일(K. I. Han),전만수(M. S. Joun) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
In this paper, an experimental and numerical approach was applied to identifying the heat transfer coefficients between the environments inside the furnace and the billet which is partially inside the open type furnace. The heat transfer coefficients are employed for analyzing the heating process and optimizing the consecutive forging process for fabricating T-shape forgings with long stem. A special forging process for manufacturing of spindles is introduced.
김민철(M. C. Kim),남찬희(C. H. Nam),남태현(T. H. Nam),강석순(S. S. Kang),전만수(M. S. Joun) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
In this paper, finite element analysis of die wear phenomenon in hot forging of a partially heated material for T-shape product is conducted using a rigid-thermoviscoplastic finite element method with an Archard wear model. The entire process including partial heating process and two hot forging stages is dealt with. The predictions are compared with experiments in terms of die wear in a qualitative manner. The comparison shows a good agreement between the predictions and experiments.
그립의 기능을 강조한 롤단조 공정의 유한요소모델링 및 적용
진호태(H. T. Jin),남태현(T. H. Nam),강석순(S. S. Kang),전만수(M. S. Joun) 한국소성가공학회 2016 한국소성가공학회 학술대회 논문집 Vol.2016 No.4
In this paper, a finite element model of grip in roll forging is presented, which is believed to have a deep influence on both finite element predictions and real process. A fraction of roll separating force is exerted on the front end of the material to be pulled. The pulling force during forming is considered as surface traction at the end. Effect of the pulling force is examined, revealing that the predictions of final length and major deformed region have a distinct function of the fraction of the pulling force with respect to the roll separating force, which can be a characteristic property of the process. The approach is applied to aluminum roll forging of manufacturing an optimized perform for a stepped bar.