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A Study on the Characteristics for the Blanking of Lead Frame with the nickel alloy Alloy42  

Bahn Gab-su (상주대학교 자동차학과)
Suh Eui-kwon (상주대학교 자동차공학과)
Lee Gwang-ho (상주대학교 자동차공학과)
Mo Chang-ki (상주대학교 자동차공학과)
Publication Information
Transactions of the Korean Society of Machine Tool Engineers / v.13, no.6, 2004 , pp. 87-93 More about this Journal
Abstract
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 comer radius is used to study the characteristics of blanking for straight side and comer region simultaneously. As the result the ratios measured k(m 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 mil over and fracture is increased as the clearance increases. When the radius of comer 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 comer region.
Keywords
Ni Alloy; Lead frame; Blanking; Finie element analysis; Element deletion method; Clearance;
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