An experimental is carried out to investigate the characteristics of blanking for nickel alloy Alloy42 (t=0.203㎜), 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.
An experimental is carried out to investigate the characteristics of blanking for nickel alloy Alloy42 (t=0.203㎜), 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.
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