How to flatten a curved surface in Solidworks?


Here is the way to do it:
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Step 1:
1.Delete the solid body in order to keep only the surface
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Step 2:
2.Calculate the diameter of the holes. I calculated 50mm. Then use the surface fill command to close the holes.
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Step 3:
3.Use the surface flatten command and use the selections in the attached picture.
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Step 4:
4.Use delete bodies to remove the curved surface. Then open a sketch on the flat surface and convert entities.
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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.
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Step 6:
6.Export a dxf flat pattern for cut.
Good luck.