A novel fine-blanking approach

This paper proposes a novel approach to fine blanking. The V-ring indenter used in conventional fine blanking is no longer required; a trough on the die is used instead. In this approach, the cutting process combined with high hydrostatic stresses produced from the trough on the die cutting edge can substantially decrease the fracture in the shear zone. A series of experimental tests with experimental specimens of various thicknesses was conducted. The burnished surface obtained from this approach can nearly achieve the complete thickness of the blank in one operation, suggesting that the fracture zone can be nearly eliminated. In addition, the surface roughness of the burnished surface range was measured between 0.03 and 0.08 μm, and the tolerance band for the diameter was between IT2 and IT4. These results indicate an improvement in the values obtained using conventional fine blanking.