Application of Finite Element Method to Analyze the Influences of Process Parameters on the Cut Surface in Fine Blanking Processes by Using Clearance-Dependent Critical Fracture Criteria

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.

An investigation of the shearing performance and sheared surface characterization of Ultra-Strength DP Steel-Al Explosive Welded Plate Composite

“…share surface quality is one of the most important factors that provide exibility and stretchability during expansion and anging in the punching process. Therefore, it is an essential criterion in the quality approach of the cutting process [37]- [39]. This study determined that four different regions can be analyzed according to the literature's surface texture and cutting surface.…”

Numerical Investigation of the Damage Effect on the Evolution of Adiabatic Shear Banding and Its Transition to Fracture during High-Speed Blanking of 304 Stainless Steel Sheets

“…The results showed that increased speed results in lower peak force, as a high strain rate enhances adiabatic deformation and ther-mal softening. Myint et al [21] studied the effect of blanking parameters on cut surfaces considering Cockcroft-Latham and Oyane damage models. The Oyane criterion proved more accurate for predicting the fractured profile, while clearance, punch-die radii, initial compression, punch diameter, and stress triaxiality were found to affect the quality of the cut surface.…”