how can i bent a pipe using solidworks, i here by attach the bending details of round tube 25 cm dia, how can i bent it and un bent it
That would normally be done as a sweep feature, you could try the flex or deform tools.
SolidWorks Sheet Metal tools only work on parts with constant thickness, so you have to cheat to make a part that you can bend and unbend. If your part were a solid cylinder, you could make it out of square stock first and then add separate fillets to the bent and unbent configurations. Since you are using a tube, I think you could add separate Shell features to the two configurations after the fillets.
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