Working with Sheet Metal Parts - Inventor 2013 and Inventor LT 2013 Essentials - page 236

Now the sketch is visible, and you can use the bend lines from the
flat pattern to fold the material into a 3D form.
11. Start the Fold tool on the Create panel.
12. For the first Bend Line selection, click the red line beside the number 1.
This displays a glyph of a straight arrow showing which side of the
bend will be folded and a curved arrow to show the direction of the fold.
13. Click Apply to fold a small portion of the part.
14. For the second edge, click the line next to the number 2, and select
Apply.
15. Click the edge near the number 3. Notice that the glyph indicates that
it will fold up the wrong portion of the part.
16. Click the Flip Side icon to make sure that the correct geometry
(Figure 10.21) will be folded, and click OK.
The component is now suitable for building new drawings or devel-
oping new features. Changes to the sketch will modify the folded
component as expected.
FIGURE 10.21 Folding a flat portion of a face around a line
Adding the Finishing Touches
Creating the big portions of a sheet metal part has been covered so far, but the
details are also important. Adding chamfers, fillets, and hems to the metal improve
safety for the customer and add strength to the part.
1. Verify that the 2013 Essentials project file is active, and then open
c10-10.ipt from the Parts/Chapter​10 folder.