Abstract
The correct choice of process parameters is important in predicting the cut surface and obtaining a fully-fine sheared surface in the fine blanking process. The researchers used the value of the critical fracture criterion obtained by long duration experiments to predict the conditions of cut surfaces in the fine blanking process. In this study, the clearance-dependent critical ductile fracture criteria obtained by the Cockcroft-Latham and Oyane criteria were used to reduce the time and cost of experiments to obtain the value of the critical fracture criterion. The Finite Element Method (FEM) was applied to fine blanking processes to study the influences of process parameters such as the initial compression, the punch and die corner radii and the shape and size of the V-ring indenter on the length of the sheared surface. The effects of stress triaxiality and punch diameters on the cut surface produced by the fine blanking process are also discussed. The verified process parameters and tool geometry for obtaining a fully-fine sheared SPCC surface are described. The results showed that the accurate and stable prediction of ductile fracture initiation can be achieved using the Oyane criterion.
Highlights
The fine blanking process is used to produce fine sheared surfaces in metal forming processes
This is due to the effect of initial compression and tool geometry, including lower die corner radius
Finite Element Analysis (FEA) was performed to observe the nature of cut surfaces of SPCC in the fine blanking process
Summary
The fine blanking process is used to produce fine sheared surfaces in metal forming processes. The relationships between the punch-die clearance and the length of the sheared surface in the fine blanking process were investigated by Kwak et al In that work, the Cockcroft-Latham criterion was used, and the influence of the punch-die clearance on the fracture zone, shear zone and die-roll were described [3]. Tanaka et al used the Cockcroft-Latham, Oyane and Rice and Tracey criteria to study the shear droop on the punched surface in the fine blanking process and found that the differences between the shear droops obtained from FEM simulations and the experimental values could be reduced by implementing a remeshing function [6]. The forming quality of part shape in the fine blanking process with the Oyane fracture criterion was studied by Liu et al, and the relationships between the part shape and the die-roll height and crack surface height were described [7].
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