How to flatten a curved surface in Solidworks?

Here is the way to do it:

  1. Step 1:

    1.Delete the solid body in order to keep only the surface

  2. Step 2:

    2.Calculate the diameter of the holes. I calculated 50mm. Then use the surface fill command to close the holes.

  3. Step 3:

    3.Use the surface flatten command and use the selections in the attached picture.

  4. Step 4:

    4.Use delete bodies to remove the curved surface. Then open a sketch on the flat surface and convert entities.

  5. Step 5:

    5.Create a base flange in sheet metal using the sketch. Then cut the 2 holes you removed in step 2. In order to place them draw a 3 point arc on the curved edge and make the cuts concentric.

  6. Step 6:

    6.Export a dxf flat pattern for cut.
    Good luck.