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Al계 초소성합금과 Zr계 비정질합금의 마이크로 진동성형에 관한 연구
손선천(Seon Cheon Son),박규열(Kyu Yeol Park),나영상(Young Sang Na) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
Micro forming is a suited technology to manufacture very small metallic parts(several ㎜-㎛), Al5083 superplastic alloy with very small grains has a great advantage in achieving micro deformation under low stress due to its relatively low strength at a specific high temperature range. 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, the micro formability of Al5083 superplastic alloy and bulk metallic glass, Zr?₂Cu₁?Ni₁₃Al?, was investigated with the specially designed micro vibration forming system using pyramid-shape, V-shape and U-shape micro die pattern. With these dies, micro vibration forming was conducted by varying the applied load, time. Micro formability was estimated by comparing the hight of formed shape using non-contact surface profiler system. The vibration load was effected to metal flow in the micro die and improve the micro formability of Al5083 superplastic alloy and Zr?₂Cu₁?Ni₁₃Al? bulk Metallic glass(BMG).
Al계 초소성합금과 Zr계 비정질합금의 마이크로 진동성형에 관한 연구
손선천(Seon Cheon Son),박규열(Kyu Yeol Park),나영상(Young Sang Na) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.6
Micro forming is a suited technology to manufacture very small metallic parts(several mm~㎛). Al5083 superplastic alloy with very small grains has a great advantage in achieving micro deformation under low stress due to its relatively low strength at a specific high temperature range. 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, the micro formability of Al5083 superplastic alloy and bulk metallic glass, Zr?₂Cu₁?Ni₁₃Al?, was investigated with the specially designed micro vibration forming system using pyramid-shape, V-shape and U-shape micro die pattern. With these dies, micro vibration forming was conducted by varying the applied load, time. Micro formability was estimated by comparing the hight of formed shape using non-contact surface profiler system. The vibration load effect to metal flow in the micro die and improve the micro formability of Al5083 superplastic alloy and Zr?₂Cu₁?Ni₁₃Al? bulk Metallic glass(BMG).
Al계 초소성합금과 Zr계 비정질합금의 마이크로 진동성형에 관한 연구
손선천(Seon Cheon Son),박규열(Kyu Yeol Park),나영상(Young Sang Na) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
Micro forming is a suited technology to manufacture very small metallic parts(several ㎜-㎛), Al5083 superplastic alloy with very small grains has a great advantage in achieving micro deformation under low stress due to its relatively low strength at a specific high temperature range. 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, the micro formability of Al5083 superplastic alloy and bulk metallic glass, Zr?₂Cu₁?Ni₁₃Al?, was investigated with the specially designed micro vibration forming system using pyramid-shape, V-shape and U-shape micro die pattern. With these dies, micro vibration forming was conducted by varying the applied load, time. Micro formability was estimated by comparing the hight of formed shape using non-contact surface profiler system. The vibration load was effected to metal flow in the micro die and improve the micro formability of Al5083 superplastic alloy and Zr?₂Cu₁?Ni₁₃Al? bulk Metallic glass(BMG).
진동복합하중에 따른 Al계 초소성합금과 Zr계 비정질합금의 마이크로 성형에 관한 연구
손선천(Son Seon Cheon),박규열(Park Kyu Yeol) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Micro forming is a suited technology to manufacture very small metallic parts(several ㎜~㎛). In this study, the micro forming property was studied, using Al5083 superplastic alloy with micro grain, suitable for the micro forming process and Zr-BMG amorphous with pseudo-superplastic phenomena in the supercooled liquid state. In a energy point of view, the vibrational load was useful for micro forming field. The vibrational load reduced friction and sticking slip between micro die and material and release the air static pressure bearing effect between micro die and material.
마이크로 단조를 이용한 Zr 계 벌크 비정질합금의 미세 성형성 평가와 유한요소해석 적용에 관한 연구
강성규(Sung Gyu Kang),나영상(Young Sang Na),박규열(Kyu Yeol Park),손선천(Seon Cheon Son),이종훈(Jong Hon Lee) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.4
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 Rj values (=A<SUB>f</SUB>/A<SUB>g</SUB>), where A? is cross-sectional area ofU groove, and Ar the filled area by material. Micro-forging process was simulated and analyzed by applying finite element method. FEM simulation results showed reasonable agreement with the experimental results when the material properties and simulation conditions such as top die speed, remeshing criteria and boundary conditions were 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 a commercial software, DEFORM was confirmed to be applicable for the optimization of micro-forming process.
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.