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RISS 인기검색어
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- 저자 : 이경훈(K. H. Lee) (검색결과 143 건)
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소형 헬리컬 기어 압출 시 Zn-22wt%Al 합금 분말의 강화방법에 따른 미세 조직 변화에 관한 연구
이경훈(K.H. Lee),이정민(J.M. Lee),고대철(D.C. Ko),김병민(B.M. Kim) 한국소성가공학회 2011 압출 및 인발 심포지엄 Vol.2011 No.8
The extrusion with different powder consolidation methods, which is based on the superplastic behavior of the Zn-22wt%Al alloy powder, is proposed to observe the microstructure of helical gears and extrudability. The specifications of the helical gears were as follows: m, 0.3; Z, 12; Dp, 3.727mm; and β, 15˚. Compacted powders were consolidated by solution treatment, dwelling & quenching and sintering. The consolidated billets consisted of equiaxed fine grained structure, lamellar structure and mixed phase. Extrusion experiments were carried out under the following conditions: temperature, 250˚C and extrusion velocity, 0.1mm/min. The mechanical properties of extruded helical gears were investigated by measurement of Vickers hardness, extrusion load and SEM observation.
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이경훈(K. H. Lee),성낙문(N. M. Sung),이태순(T. S. Lee),김병민(B.M. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
The aim of this paper is to develop a feasible forming condition under which the radial-axial ring rolling (RARR) process can be established successfully and then leads to diminished fishtail defects. The mathematical model for the RARR process is developed based on the constant volume condition of ring blanks and the constant growth velocity condition (CGVC) of a ring outer diameter. The feasible forming condition is determined by the reasonable rage of extreme growth velocities. For a verification of the feasible forming condition for RARR process, experiments are carried out.
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이경훈(K. H. Lee),김병민(B. M. Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
In ultrasonic vibration drawing, the drawing forces can be reduced by applying ultrasonically oscillating dies. Ultrasonic vibration drawing has been considered as a means of accommodating high-level drawing processes such as shaped wire, ultrafine wire, and the wire drawing operation in semidry or dry condition. Prior studies were attempted to analyze the mechanism of improved drawing performances, such as reduced drawing force and improved lubrication characteristic. However, researches on design rule for ultrasonic vibration drawing system are not yet carried out. The principal objectives of this work are to design a set of tooling capable to superimpose the oscillations and to observe by experiments the influence of the ultrasonic oscillations on the wire drawing.
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이경훈(K. Lee),곽은정(E.J. Kwak),김헌영(H. Y. Kim),이기동(Gi-Dong Lee),박종규(Jong-Kyu Park),서창희(Chang Hee Suh) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In hot press forming process, the desired high strength can be obtained through quenching process after cold forming of product. The quenching process, however, accompanies undesired distortion due to the volume change during the phase transformation as well as by thermal contraction. In this study the numerical simulation with DEFORM3D-Micorstucture is used to predict the deformed shape during the quenching for the quenching fixture design.
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초소형 스퍼기어 제조를 위한 초소성 A1-78Zn 분말 압출
이경훈(K. H. Lee),김진우(J. W. Kim),황대원(D. W. Hwang),김종현(J. H. Kim),장석상(S. S. Chang),김병민(B. M. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
This study was designed to fabricate the micro-electro-mechanical systems (MEMS) parts such as micro spur gears using hot extrusion of gas atomized Al-78Zn powders. For this purpose, it is important to develop new methods to fabricate micro-dies and choose suitable extrusion conditions for a micro-forming. Micro-dies with Ni were fabricated by LIGA technology. LIGA technology was capable to produce micro-extrusion dies with close tolerances, thick bearing length and adequate surface quality. Superplastic Al-78Zn powders have the great advantage in achieving deformation under low stresses and exhibiting good micro formability with average strain rates ranging from 10<SUP>-3</SUP> to 10<SUP>-2</SUP> s<SUP>-1</SUP> and constant temperatures ranging from 503 to 563K. Al-78Zn powders were compacted into a cylindrical shape (Φ3xh10) under compressive force of 10kN and, subsequently, the compacted powders were extruded at 563K in a hot furnace. Micro-extrusion has succeeded in forming micro-gear shafts.
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Titanium 소재를 이용한 연료전지 분리판 제조 특성 및 TiN 박막 물성 평가
이경훈(K. H. Lee),진철규(C. K. Jin),강충길(C. G. Kang) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
In this study, the rubber pad for forming process is used to fabricate the micro-channel plate of Titanium for the fuel cell. The geometry of plate should have micro-channel and thin for high-efficiency heat exchanger. The micro-channel plate was fabricated using a hydraulic press with a capability of 200 ton according to the various parameters (type of plate, plate thickness, punch speed, press pressure, rubber thickness, rubber hardness, draft angle)of the rubber pad forming in order to evaluate the formability. TiN films were deposited by reactive DC magnetron sputtering (DCMS) with an electromagnetic field system (EMFS). The microstructure and corrosion resistance of the TiN-coated Titanium substrates were estimated by Nano-indentationXP (MTS), Atomic Force Microscopy (AFM), and electrochemical methods. This improved corrosion resistance of the TiN films could be attributed to the densification of the film caused by enhancement of nitrification with increasing high reactive nitrogen radicals.
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