The DIN 6935 standard provides comprehensive guidelines for the cold bending of flat steel products. It is primarily used in mechanical engineering and steel construction to ensure uniform results and calculate accurate material requirements for bent parts. Key Features of DIN 6935
Material Guidelines: Specifies minimum permissible bending radii based on the material's sheet thickness ( ) and grade.
Stretched Length Calculation: Provides formulas and compensation values (
) to determine the exact length of the flat blank needed to produce a bent part, accounting for changes in the "neutral fiber" during the process.
Standardized Bending Radii: Recommends a series of radii (e.g., 1, 1.2, 1.6, 2 mm) to promote uniformity across manufacturing tools.
Angular Deviations: Defines permissible tolerances for both bending radii and the final angular positions of the bent sections.
Leg Length and Thickness: Establishes minimum leg lengths for bent parts and notes that material thickness typically decreases by approximately 20% in the rounded portion of the bend. Technical Documents & Resources Din 6935 Standard Pdf
For detailed engineering tables and calculation examples, you can reference these document previews:
Standard Summary: A detailed breakdown of sections including scope, calculation methods, and material keys is available on Scribd - DIN 6935 Soğuk Bükme.
Updated Version (2011): Information on the latest DIN 6935:2011-10 revision, which supersedes older 1975 and 2010 versions, can be found on Scribd - Cold Bending Standards.
Quick Reference: General bending suitability and rolling direction tips are summarized by Modulus Metal. DIN 6935 Cold Bending Guidelines | PDF - Scribd
standard, specifically the current DIN 6935:2011-10 provides the technical requirements for the cold bending of flat rolled steel products
. It is widely used in steel construction and mechanical engineering to determine minimum bending radii, calculate the "developed length" (the flat length of metal needed before bending), and establish permissible deviations. Core Technical Specifications The DIN 6935 standard provides comprehensive guidelines for
The standard focuses on how material behaves during the cold bending process, specifically accounting for the displacement of the "neutral fiber" (the line within the metal that neither stretches nor compresses). Bending Radius (
The standard specifies the minimum permissible bending radius based on the material's thickness (
) and the steel grade. For uniform curves, it recommends selecting from a preferred series of radii. Developed Length Calculation:
To find the total length of the flat sheet needed, the standard uses the formula: Elongated length Elongated length equals a plus b plus u are the straight leg lengths and compensation value Compensation Value ( This value changes depending on the opening angle ( 0 raised to the composed with power 65 raised to the composed with power can be positive or negative. 65 raised to the composed with power is exclusively negative. 165 raised to the composed with power 180 raised to the composed with power is typically considered negligible (set to 0). Correction Factor ( Also known as the
, this factor accounts for the shift of the neutral fiber. For a radius-to-thickness ratio , the standard typically sets Modulus Metal Available PDF Resources
While official standards must be purchased, technical summaries and translations are available through several platforms: Official Purchase: You can buy the full, authorized English or German PDF of DIN 6935:2011-10 from DIN Media or through the European Standards store Technical Summaries: Key Technical Concepts in the Standard If you
Detailed 13-page English guides and translations are often hosted on platforms like
, which include the calculation tables and example problems. Engineering Data Sheets: Sites like Modulus Metal
provide concise tables for minimum bending radii and opening angle formulas based on the standard. Modulus Metal Summary Table: Key Parameters Definition / Significance Material Thickness Decreases by ~20% in the bent area. Inside Radius Chosen from preferred series to ensure part integrity. Opening Angle Used to determine the compensation value Bending Angle The angle through which the material is bent ( 0 raised to the composed with power 180 raised to the composed with power Minimum Leg Length Recommended as approximately to avoid defects. calculation example for a 90-degree bend using these DIN 6935 parameters? DIN 6935 Cold Bending of Flat Rolled Steel - Modulus Metal
If you are looking at a DIN 6935 PDF, you will likely see charts and formulas revolving around three core concepts:
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.