Study on effect of draw bead on slip line of stamping part surface

摘要

The slip line is one of the defects on the surface of the stamping parts, which seriously affects thenforming precision and the surface quality. The forming processes of the box shaped part withncurved bottom under the different draw beads were studied by the simulation and experiments.nThe results showed that the flow of the blanks under the different draw beads were also differentnto each other. When the blank passed through the draw bead, deformation force of bending andnreverse bending, friction force and deformation resistance generated by deformation-hardeningnincreased the feed resistance, so that the flow velocity and feedrate of different regions of thenblank could be controlled by changing the geometrical parameters and the positions of the drawnbead. The different draw beads not only changed the displacement of the slip line, but also thenmoving direction of the slip line.