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전만수(Joun Man Soo),신상현(Shin Sang Hyun),전병윤(Jun Byoung Yoon),이민철(Lee Min Cheol),서관수(Suh Kwan Soo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In this paper, a new design of the sprinkler branch outlet for fire-extinguishing purposes is presented together with its manufacturing process. The conventional three-piece design is improved by a new one-piece design with the help of the manufacturing technology of cold forging. The forging process is simulated and optimized by the rigid-plastic finite element method and the design tryouts are thus minimized. It has been shown through its applications that the presented system is much more economical and structurally stronger.
AIP 법에서 질소가스 압력이 고속도강의 TiN 코팅층 성질에 미치는 영향
김해지(Hae Ji Kim),전만수(Man Soo Joun) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The effect of nitrogen gas pressure in arc ion plating on surface properties of the TiN-coated high speed steel(SKH51) is presented in this paper. The surface roughness, micro-particle, micro-hardness, coated thickness, atomic distribution of TiN, and adhesion strength are measured for various nitrogen gas pressures. It has been shown that the nitrogen gas pressure has a considerable effect on the surface roughness, adhesion strength, atomic distribution of TiN, and surface deposition of TiN of the high speed steels but that it has little influence on the micro-hardness and coated thickness.
다양한 증착시간 조건에서 AIP 기법으로 코팅된 SKH51 과 SKD11 특수강의 표면 특성의 변화에 관한 연구
김해지(Hae Ji Kim),전만수(Man Soo Joun) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In this paper, the characteristics of the AIP coated layer of the SKH51 and SKD11 special steels under various deposition times are presented with emphasis on the comparison of the two materials. The microparticle, the surface roughness, the micro-hardness, the coated layer thickness, the atomic distribution of Ti, N and Fe elements and the adhesion are measured for various deposition times. It has been shown that The micro-particle, the surface roughness, the coated layer thickness and the atomic distribution of Ti, N and Fe elements are similar for the two cases regardless of the test deposition time of 10~180 minutes. However, it has been shown that the micro-hardness and the adhesion of the SKH51 steel are higher than the SKD11 steel, indicating that they are much affected by the hardness of the material to be coated.
최인수(In-Su Choi),김민철(Min-Cheol Kim),김홍태(Hong-Tae Kim),전만수(Man-Soo Joun) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
An electric upsetting process by the rigid-thermoviscoplastic finite element method was simulated in this study. Several engineering assumptions were made to calculate the heat generation due to the electric resistance. The skin effect of the bar was taken into account for the heat generation. The approach was applied to simulate an artifical electric upsetting process for the exhaust valve of the ship engine.