Abstract
A numerical analysis using FE (finite element) analysis was performed to clarify the shearing mechanism in the process of extrusion-type fine blanking (FB) for a thin foil of JIS SUS304 in this study. Extrusion-type FB, in which a negative clearance between the punch and the die has been developed and investigated experimentally to improve the quality of the sheared surface in the blanking of thin foils. The resultant sheared surface for extrusion-type FB indicated an almost completely sheared surface, and the fracture portion on the sheared surface was much smaller than that in conventional FB, the so-called finish-type FB. The material flow and fracture criteria in extrusion-type FB were analyzed in comparison with those in finish-type FB. The differences in material flow and so-called critical fracture value were verified for the two processes. The principal stress near the shearing surface has mostly compressive components in extrusion-type FB due to its negative clearance, and the critical fracture value was also less than that in finish-type FB, in which the principal stress near the shearing surface has mostly tensile components. Furthermore, SEM observation with EBSD (electron back-scatter diffraction) analysis of the shearing surface was performed to verify the phenomena. Reductions in deformation-induced crystal orientation rotation and martensite transformation in extrusion-type FB were confirmed in comparison with those in finish-type FB from the analysis results.
Highlights
The notable miniaturization of electronic devices and medical instruments has been observed
fine blanking (FB), theindamage valueincluding was alsothe high in the punch highshoulder in the punch andcase punch side, but it was lower other regions shearing shoulder and punch side, but it was lower in other regions including the shearing zone, which zone, which means that some allowance remains to prevent fracture
The critical damage value, an index showing the possibility of fracture in the workpiece during FB, was introduced as a critical fracture value
Summary
The notable miniaturization of electronic devices and medical instruments has been observed. The advantages by an experimental comparison with the conventional FB process using a generalconventional FB process is finish-type FB with an extremely narrow positive tool clearance and a purpose precision stamping press machine [10]. The results, the developed process was found to be superior from the most important viewpoint of material flow and fracture mechanism have not yet been clarified, and the most important suppressing the fracture of the surface. An FE analysis is performed to clarify the material flow and fracture mechanism in extrusion-type FB in comparison with finish-type FB, from the viewpoint of suppressing extrusion-type FB in comparison with finish-type FB, from the viewpoint of suppressing fracture or cracking on the shearing surface during the FB process. Obtained by the orientation analysis of the crystallinity of the shearing surface of samples
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