To determine the correct flat blank size (developed length) before bending, DIN 6935 introduced the concept of the .
When you bend a piece of sheet metal, the outside of the bend stretches, and the inside compresses. The neutral axis (where no stretching or compression occurs) shifts inward. DIN 6935 provides a scientifically validated method to locate that neutral axis using the . Din 6935 Standard Pdf
Where:
One of the most valuable parts of the standard is how it handles the —the line in the material that doesn't stretch or compress during bending. The standard uses a compensation value ( ) to adjust the total leg length. Formula Logic: Depending on the opening angle, can be positive or negative. For angles over 65∘65 raised to the composed with power , the compensation value is typically negative. 3. K-Factor and Material Behavior DIN 6935 defines a correction factor ( To determine the correct flat blank size (developed
| Standard | Scope | | :--- | :--- | | | Tolerances for bent parts made from flat steel | | ISO 2768 | General tolerances for machined & formed parts (not bending-specific) | | DIN 6930 | Tolerances for stamped and formed parts from sheet metal | DIN 6935 provides a scientifically validated method to
Note: For a pure 90° bend, many CAD programs convert this into a Bend Deduction value.
According to insights from the Autodesk Community , DIN 6935 uses a specific to account for this shift. If you don't calculate this correctly, your finished part will be either too long or too short. Key technical takeaways include: