• The Korean Journal of Rheology
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• v.1 no.1
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• pp.36-45
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• 1989

아이어닝 공정은 제품의 치수정밀도가 정확하게 조절괴는 정밀 금속 성형공정이다. 아이어닝 공정은 대개 냉간상태에서 행하여지며 그리고 때로는 단공정 대신에 다단식이 적 용된다. 본연구의 목적은 강소성 유한 요소법으로 단공정과 다단식 아이어닝 공정을 해석하 여 아이어닝 공정에 대한 적절한 설계변수와 최적 설계조건을 찾는데 있다. 본 연구에서는 공정설계게 있어서 공정변수를 다이의 원추각과 단의 개수로 주었다. 본 해석에서는 단공정 아이어닝과 다단식 아이어닝 공정의 성형하중, 응력과 변형도 분포 그리고 격자 변형을 계 산하였다 그리고 이 값들에 대한 공정 변수의 영향을 검토한 결과 성형하중과 격자 변형에 있어서 계산 결과와 잘 일치하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.73-73
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• 2003

• Transactions of the Korean Society of Mechanical Engineers A
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• v.26 no.10
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• pp.2096-2103
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• 2002

Cold ironing, as a post-forging operation of warm forged gears, needs a clear understanding of form errors due to die-elasticity and springback of component. In order to simplify the analysis of cold ironing, a single tooth instead of a whole gear component was investigated. The influence of initial surface roughness, die design, and die/workpiece interference has been examined experimentally and numerically. As a result the changes in geometrical profile, dimensions, and surface finish in a single tooth were observed. This study demonstrates that predicted dimensions can be achieved and surface finish also can be greatly improved.

• Transactions of the Korean Society of Mechanical Engineers
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• v.18 no.9
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• pp.2234-2244
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• 1994

A process sequence of multi-operation cold forging for actual application in industry is designed with the rigid-plastic finite element method to form a constant velocity joint housing(CVJ housing). The material flow during the CVJ housing forming is axisymmetric until the final forging process for forming of ball grooves. This study treats the deformation as an axisymmetric case. The main objective of the process sequence design is to obtain preforms which satisfy the design criteria of near-net-shape product requiring less machining after forming. The process sequence design also investigates velocity distributions, effective strain distributions and forging loads, which are useful information in the real process design.