This is the most critical section for searchers. As a protected intellectual property, the standard is copyrighted by Beuth Verlag (the German institute for standardization, now part of VDE Verlag). You cannot legally download a free, complete, and authoritative PDF from random websites, as those are often outdated, watermarked, or scanned incorrectly.
Here are your legal options to obtain the DIN 6935 Standard PDF:
Published by the Deutsches Institut für Normung (DIN), this standard specifies the permissible deviations in dimensions and form for bent workpieces made from flat rolled steel. Unlike general geometric tolerances (e.g., ISO 2768), DIN 6935 focuses exclusively on the unique behaviors of bending—such as springback, elongation, and thinning of material at the bend radius.
DIN 6935 provided methodologies for calculating "springback." When metal is bent, it exhibits elastic recovery once the bending force is removed. Din 6935 Standard Pdf
The standard provides a direct formula for calculating the length of the neutral axis in the bend zone:
[ A = \pi \cdot (r + v \cdot s) \cdot \frac\beta180 ]
Where:
It is important to note that while DIN 6935 is a classic standard, the international community often refers to the ISO 13715 (for drawings) and various material-specific standards for bending. However, DIN 6935 remains a staple in German engineering and industries using European machinery because it is highly practical and specifically tailored to the properties of steel sheets.
If you are looking at a DIN 6935 PDF, you will likely see charts and formulas revolving around three core concepts:
Conversely, the standard allows for the calculation of bend deduction, which is the amount subtracted from the total outside dimensions of the part to arrive at the flat size. This is the most critical section for searchers
The total blank length ( L ) is the sum of the straight leg lengths plus the neutral axis length in the bend:
[ L = l1 + l2 + ... + A ]