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해석과 실험을 통한 박판성형공정에서의 드로오비드의 구속력에 관한 연구
반갑수 ( Gab-su Bahn ),모창기 ( Chang-ki Mo ),서의권 ( Eui-kwon Suh ) 한국산업융합학회 2007 한국산업융합학회 논문집 Vol.10 No.1
It is necessary for development of drawing product with press to have suitable material selection & all process design and the problem during press process has been cleared from judgement of experience & trial and error. Recently we can estimate press process result from computer aided design & FEM. But we can get more reliable result when we can put more precise process variants during FEM. In case of using a drawbead that is used for the material inflow, it is considered for us to put material property, other analysis condition & friction figure when material is passing through the drawbead for better FEM. From our study, we have drawn an analogy bead connection depth, friction figure & drawing and restraining load according to kinds of lubrication from experiment & FEM for the drawbead. We applied above result to the drawing experiment & FEM and confirmed the validity. We could notice the relation between friction figure & drawing load and the friction figure variation according to kinds of lubrication. It is expected to draw more precise analogy that can be used for real process due to more precise process variants application to FEM.
니켈합금 Alloy42를 사용하는 리드프레임의 블랭킹 특성에 관한 기초연구
반갑수,서의권,이광호,모창기 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.6
An experimental is carried out to investigate the characteristics of blanking for nickel alloy Alloy42 (t=0.203mm), a kind of IC lead frame material. By varying clearance between die and punch, the shapes of shear profile are examined. Finite element analysis with element deletion algorithm for ductile fracture mode is also carried out to study the effect of clearance theoretically and to compare with experimental results. The rectangular shape specimen with four different corner radius is used to study the characteristics of blanking for straight side and corner region simultaneously. As the result, the ratios measured from experiment of roll over, burnish, and fracture zone based on initial blank thickness are compared with those of FE analysis. Both experiment and FE analysis show that the amount of roll over and fracture is increased as the clearance increases. When the radius of corner is less than thickness of blank, it has been found that larger clearance is required than that of straight region in order to maintain same quality of shear profile at the corner region.