Abstract
The C-U-O forming method is generally applied when manufacturing large diametrical pipes for petroleum and natural gas pipeline. C-U-O pipes of about 10-time length to the diameter were producted conventionally, the product time per length and the cost should be reducible by making of long pipes. Since length of welding would be reduced, fatigue strength and static strength will be achieved. In this study, characteristic of long pipe forming used C-U-O forming method was investigated by FEM analysis. Effect of each parameters about accuracy of blank was examined, and optimal forming condition for long high aspect pipe was showed by forming experiment.
