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진동 하중을 이용한 마이크로 부품 및 표면 패턴 성형 기술
나영상(Y. S. Na),이종훈(J. H. Lee),이원식(W. S. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Vibration micro-forming of pyramidal shape patterns was conducted for an Al superplastic alloy. Al 5083 and a Zr-based bulk metallic glass, Zr62Cu17Ni13AI8. A vibrational micro-forming. The micro-formed pattern height was increasing with increasing the frequency of the vibrational load. In particular, the vibrationally-microformed pattern height was similar or even higher than the statically-icroformed pattern height when the load frequency exceeded about 125 kHz. It was also observed that the crystal grains affect the surface quality of the microformed pattern and the distribution of the pattern height in the die cavity array.
Zr 계 벌크비정질합금의 마이크로 단조를 이용한 미세 성형성 평가와 유한요소해석 적용에 관한 연구
강성규(S. G. Kang),나영상(Y. S. Na),박규열(K. Y. Park),손선천(S. C. Son),이종훈(J. H. Lee) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
Micro-forming is a suited technology to manufacture very small metallic parts(several mm~㎛). Micro-forming of Zr?₂Cu₁?Ni₁₃Al? bulk metallic glass(BMG) as a candidate material for this developing process are feasible at a relatively low stress in the supercooled liquid state without any crystallization during hot deformation. In this study, micro-formability of a representative bulk metallic glass, Zr?₂Cu₁?Ni₁₃Al?, was investigated for micro-forging of U-shape pattern. Micro-formability was estimated by comparing R<SUB>f</SUB> values (=A<SUB>f</SUB>/A<SUB>g</SUB>), where Ag is cross-sectional area of U groove, and A<SUB>f</SUB> the filled area by material. Microforging process was simulated and analyzed by applying finite element method. FEM simulation results should reasonable agreement with the experimental results when the material properties and simulation conditions such as top die speed, remeshing criteria and boundary conditions tightly controlled. The micro-formability of Zr?₂Cu₁?Ni₁₃Al? was increased with increasing load and time in the temperature range of the supercooled liquid state. Also, FEM Simulation using DEFORM was confirmed to be applicable for the micro-forming process simulation.