This is something that all solidworks users should know.
Solidworks sheet metal cone cut.
To cut across sheet metal bends.
The normal cut tool applies a normal cut feature that is independent from the tools that removed the material.
Solidworks tutorial sheet metal cone tutorial video how to make cone in solidworks.
You can make cuts across bend lines.
The unfold propertymanager appears.
Learn how to make a sheet metal cone that can be unrolled into a sheet metal flat pattern.
When applying the insert bends feature located on the sheet metal toolbar or from the insert dropdown menu under sheet metal solidworks tells us a non linear edge at the seam of this cone is invalid.
Normal cuts with the normal cut tool you can normalize all non normal side walls in sheet metal models.
You can select several faces to define a normal sheet metal side wall not top or bottom faces.
In an existing sheet metal part click unfold or insert sheet metal unfold.
However sheet metal parts created with the lofted bends feature avoid this limitation and unfold appropriately.
If you cannot insert an axis then the model is not an exact cone and cannot be unfolded.