CAD sheet metal drawing specification, how to express bending line

The bending line is represented by a dotted line, which is consistent with the center line ... In fact, it can also be said that the bending line is the center of the bending angle ... The representation method in the drawing is wrong ... The landlord should pay attention to: the bending line is a dotted line, which is only drawn for convenience of bending. This will be different according to the positioning direction of different bending angles, which is generally for reference only ... and the developed drawing can not be used as a fixed drawing for processing, but only a reference drawing. Some complex graphics are directly unfolded in three dimensions and then cut by laser, but the formal drawings of cutting drawings are rarely generated ... The official drawings released should be the final shape of the parts ... I hope it will be helpful to you.