If an edge already has a fillet applied the radius of the fillet is used as the bend radius for the new sheet metal part.
Convert to sheet metal solidworks.
Notice the three features added.
Here is your sheet metal box.
However in some circumstances when the design requires certain types of geometry you can use non sheet metal feature tools then insert bends or convert the part to sheet metal.
Select a face as the fixed face for the sheet metal part.
Sheet metal convert and flat pattern suppressed.
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This approach will work for any solid body you have including imported bodies made in other systems.
Select keep body if you want to keep the solid body to use in another convert to sheet metal feature.
There are specific sheet metal features you can use to create sheet metal bodies quickly.
The software automatically selects the edges on which rips are applied.
In the convert to sheet metal propertymanager you specify the fixed face and thickness of the sheet metal part the default bend radius and the edges or fillet faces on which to create bends.
When cleared the body is consumed by the convert to sheet metal feature.
2 solidworks will pick the rip edges for you by process of elimination.
Set the sheet thickness and default bend radius.
The sheet metal tool in solidworks is located in the sheet metal toolbar and drop down menu.