) is calculated using the following formula for any arbitrary bending angle:
Using the DIN 6935 standard eliminates the "guess-and-check" method in sheet metal work. By following its calculated compensation values and minimum radii, you reduce material cracking, improve part accuracy, and ensure your designs are up to international industrial specs. DIN 6935 Cold Bending of Flat Rolled Steel - Modulus Metal
The DIN 6935 standard applies specifically to (sheet and strip) with thicknesses ranging from 0.5 mm to 20 mm . It governs the calculations for parts bent using standard workshop processes, such as V-die bending and wiping. Din 6935 Standard Pdf
Understanding DIN 6935: The Standard for Bending Factor Calculations in Sheet Metal
The most common task for a designer referencing DIN 6935 is to find the correct bend radius. The standard dictates that the minimum permissible bending radius (r) depends on three primary factors: the sheet thickness (s), the steel grade, and the bending direction (transverse to the rolling direction is preferred as it offers better bendability). An extract from its tables gives you an idea of the data it provides: ) is calculated using the following formula for
The standard provides a comprehensive table specifying the minimum permissible bending radii for various steel grades, sheet thicknesses, and bending directions (transverse or parallel to the rolling direction). The "Table 1" below is a reconstruction of the data for common steel grades.
). This represents how far the metal was actually rotated from its flat state. Neutral Axis Factor ( It governs the calculations for parts bent using
: The formulas used to determine the "unfolded" length of a part. The Secret Sauce: The K-Factor and Compensation
: The , which dictates the position of the neutral axis. The Role of the K-Factor (
The deduction value compensates for the material elongation at the corner and is calculated as:
Mastering Cold Bending: A Deep Dive into the DIN 6935 Standard