This is all in the help files under "creating drawings of sheet metal Parts"
If you want to toggle the suppression of additional features in a flat pattern, create a part configuration of a flat pattern, then select a drawing view for it.
To toggle the visibility of the sheet metal bend line notes:
Select the flat pattern drawing view, right-click and select Properties.
In the View Properties tab, clear Display sheet metal bend line notes.
To toggle the visibility of the bend lines:
Hiding the bend lines, also hides the sheet metal bend line notes.
In the FeatureManager design tree, expand Drawing View to show the Flat-Pattern feature.
Expand the Flat-Pattern feature, right-click Bend-Lines and select Show or Hide.
To toggle the visibility of the bend region lines:
Right-click the drawing view in the drawing sheet.
Select Tangent Edge, Tangent Edges Visible, or Tangent Edges Removed.
- or -
Select Tangent Edge, Tangent Edges With Font to show bend region lines in the specified document
If the bend region lines do not appear, go back to the part window and right-click Flat-Pattern in the FeatureManager design tree. Select Edit Feature, and clear Merge faces. You may have to rebuild the drawing to see the tangent edges.
I forgot to mention that i do have the bend notes visible but not the bend lines. The "Diplay sheet metal bend notes" is toggled on in the properties manager for the sheet view and also the bend lines in the feature manager tree shows that the the bend lines are visible. I am wondering if there is something else i missed besides the obvious Help File instructions?
This sheet metal part does have welded corners.
This does not happen for any other sheet metal part.
Is this a problem you have had on several part or just this part ?
There has been several people including myself who have posted items about missing bend lines but I have never heard of the problem being solved.
Missing bend line
I have found that sketches have to be visible. This is accomplished by going to View/Sketches.
Unfortunately, any sketches you don't want to see must be hidden one by one by one. This is accomplished by right clicking an entity of the sketch to be hidden and selecting hide.
It sux, but it is better than redrawing the bend lines manually.
I have the same problem, no bend lines.
I went to "VIEW" and turned on "Sketches" then "Routing Points" and the bend lines are now showing"
I hope this helps,
I have found that after you turn on scketchs in the drawing you need to change the cosmetic thread display to high quality in the drawing view properties.
Turn on the view sketches in both the part and drawing. Go to the drawing view containing the flattened part and right click. Then click on "Reset Sketch Visibility". It has worked for me every time.
I think so, turn on the sketches of the feature flatt pattern