Comparative Study of the Process Fracture between Fine-Blanking with Negative Clearance and Conventional Blanking
The different separation mechanism of fine-blanking with negative clearance and conventional blanking under different blanking process are analyzed through fine-blanking with negative clearance and conventional blanking processing experiments on AISI-1045 steel. The fractography photographs in the different deformation regions, such as rollover zone, shearing band, fracture zone and burr zone are scanned by scanning electron microscope (SEM-JSM-6360LV). The place of fracture of fine-blanking with negative clearance has emerged into the middle of work piece not the undermost of workpiece, and the width of fracture band is as tiny as 50-100 micron. The smooth surface formed by the uniform plastic flow in the process fine-blanking with negative clearance, and the full course of finally toughness fracture have been analyzed in the final phase of ejecting in fine-blanking with negative clearance. From the perspective of material meso-damage, the fracture mechanism of special blanking process with negative clearance has been illustrated in details.
Zhengyi Jiang and Chunliang Zhang
H. Du et al., "Comparative Study of the Process Fracture between Fine-Blanking with Negative Clearance and Conventional Blanking", Advanced Materials Research, Vols. 97-101, pp. 191-194, 2010