For the design of the punch/die pair, it will be necessary to take into account the material and its characteristics.
After opening your 3D, I would have reservations about the feasibility. Because stamping a sheet metal thickness 4mm and making a radius of 10mm...
But maybe I'm wrong
2 Likes
Hi, this happens because once you apply the Stamping Tool (Forming Tool) in SolidWorks, the part is no longer treated as a standard bend-based sheet metal model. It becomes a formed feature, and SolidWorks cannot automatically unfold it into a flat pattern. That’s why the “Flatten” or “Flat Pattern” command doesn’t work in your case. In general, true stamping introduces plastic deformation into the material, which cannot be reversed in CAD like regular bends. This is very common in workflows involving custom metal stamping, where the final geometry is intentionally deformed to achieve functional or structural shapes. In such cases, CAD systems treat the feature as a permanent forming operation rather than a simple bend. The usual workaround is to create the flat sheet metal blank first and then apply the stamping feature afterward, or maintain a separate configuration of the flat pattern before adding the forming operation. In some cases, the “Unfold” feature may help, but it only works for bend-based sheet metal features, not true forming tools. So essentially, what you’re seeing is expected behavior in SolidWorks when dealing with stamping features rather than standard sheet metal bends.