Abstract
The cut surface of sheared products is composed of the rollover, burnished surface, fractured surface and burr. It is important to clarify the relationship between the material flow and the formation of rollover to reduce rollover and obtain the desired rollover shape. Double-sided shearing with a counter punch was carried out using an experimental device. The deformation of the sheet material was observed through reinforced glass using a high-speed camera. Then, image processing was performed to investigate the material flow. Rollover was formed by material flow in the direction of the clearance and material flow in the lateral direction, which was confirmed experimentally using image processing. When the clearance is small, the material flow in the lateral direction affected on the rollover. In contrast, when the clearance is large, the material flow in the direction of clearance affected the rollover.
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