Din 6935 Standard Pdf
The DIN 6935 standard is a foundational technical document in metal fabrication, providing standardized guidelines for the cold bending of flat rolled steel products. It is essential for engineers and designers in steel construction and mechanical engineering, ensuring accuracy, consistency, and structural integrity when designing bent components.
Here is a comprehensive write-up on the DIN 6935 standard, its key components, and its practical application. 1. Overview and Scope Topic: Cold Bending of Flat Rolled Steel.
Purpose: To define specifications for minimum bending radii, permissible deviations, and calculations for developing bending lengths, primarily for steel sheet/strip.
Relevance: The standard is used for cold-formed steel parts to prevent cracking during manufacturing and to calculate the precise flat length (unfold) needed before bending. 2. Key Technical Guidelines (DIN 6935:2011-10)
Minimum Bending Radii: The standard provides tables specifying the minimum inside radius ( Ricap R sub i ) based on the material thickness (
) and the type of steel. Selecting a proper radius is crucial to preventing surface cracks and premature failure. Bending Angle ( ): Defines the external angle, which can range from 0∘0 raised to the composed with power 180∘180 raised to the composed with power
Rolling Direction: DIN 6935 emphasizes that, for optimal performance and to minimize cracking risk, bending should generally be performed perpendicular to the rolling direction of the sheet.
Permissible Deviations: It outlines acceptable tolerances for the bending radius and the final angular position, which are critical for precision engineering. 3. Developed Length Calculation (Unfolding)
One of the primary uses of DIN 6935 is calculating the developed length (
)—the total length of the flat sheet before it is bent. The formula allows for the extension of the material on the outside of the bend and compression on the inside. Formula: : Leg lengths of the bent part. : Compensating value (or correction factor). Compensating Value ( ): This value changes depending on the bending angle ( ) and the bending radius. If the opening angle is up to 65∘65 raised to the composed with power can be positive or negative. If the angle is over 65∘65 raised to the composed with power is typically negative. 4. Key Considerations for Fabrication
Material Thickness: The standard notes that thickness can change during the bend, particularly by up to lower at the bending point.
Surface Condition: The quality of the surface is essential. Edges of the sheet should be free of burrs or cuts, as these act as stress concentrators that can lead to edge cracking. 5. Accessing DIN 6935
Official Source: The full DIN 6935:2011-10 standard can be purchased from DIN or Scribd.
Documents: Many engineering resources provide simplified, English-translated versions that detail the bending guidelines and correction tables (e.g., Scribd or Modulus Metal).
View a table of minimum bending radii based on specific steel grades? Discuss how CAD software handles DIN 6935 calculations? DIN 6935: Cold Bending Steel Standards | PDF - Scribd
I can’t provide a direct copy or full contents of the DIN 6935 standard PDF, as it is copyrighted material owned by DIN (Deutsches Institut für Normung) and Beuth Verlag. However, I can summarize its scope and key technical contents to help you understand what the document covers. Din 6935 Standard Pdf
1. The Bend Allowance Formula
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:
- ( A ) = Length of the neutral axis in the bend (mm)
- ( r ) = Internal bending radius (mm)
- ( s ) = Material thickness (mm)
- ( \beta ) = Bending angle (in degrees)
- ( v ) = Correction factor (the offset of the neutral axis)
What is DIN 6935?
DIN 6935 is a German industry standard titled "Cold bending of flat steel products – Limit deviations for bent parts and formulae for the calculation of the blank length."
Unlike general tolerance standards (like ISO 2768), DIN 6935 specifically addresses two critical aspects of sheet metal bending:
- Formulae for calculating the developed (flat) length of a bent part.
- Permissible deviations (tolerances) for angles and linear dimensions after bending.
The standard applies to flat products made of steel (including stainless and high-strength steels) with a thickness range typically between 0.5 mm and 15 mm. It is the go-to reference for automotive suppliers, HVAC manufacturers, and general machinery builders.
DIN 6935: Cold forming of flat steel products – Technical delivery conditions
Conclusion
The DIN 6935 Standard PDF is an essential tool for any engineer or fabricator working with bent steel. It provides the mathematical foundation to move from a 3D bent model to a precise 2D flat pattern, ensuring quality, reducing scrap, and meeting tight tolerances.
While free versions are tempting, purchasing the official PDF from Beuth Verlag or your local standards body guarantees you have the latest, legally compliant, and complete document. Whether you program CNC press brakes or design chassis for industrial machines, mastering DIN 6935 will immediately elevate your sheet metal accuracy.
Next Steps: Visit your corporate standards portal today to search for "DIN 6935:2017-01" or head to the VDE Verlag shop to purchase your official copy.
Disclaimer: This article is for informational purposes. Always refer to the official document for legal manufacturing and design requirements.
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. The DIN 6935 standard is a foundational technical
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
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 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:
Detailed 13-page English guides and translations are often hosted on platforms like ( A ) = Length of the neutral
, 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
DIN 6935 is the technical standard for the cold bending of flat rolled steel. It is widely used in steel construction and mechanical engineering to ensure precision during the sheet metal fabrication process. Core Purpose of DIN 6935
The standard provides the mathematical framework and geometric rules for calculating the developed length (unfolded length) of a part before it is bent. This ensures that once the metal is formed, its final dimensions remain accurate despite the physical stretching and compression that occur at the bend. Key Technical Specifications DIN 6935 Cold Bending Guidelines | PDF - Scribd
standard is a critical reference for engineers and fabricators involved in the cold bending of flat-rolled steel. It provides a standardized framework for determining how metal behaves when bent, ensuring that final dimensions are accurate after the sheet is flattened or "developed". Key Specifications of DIN 6935 Bending Parameters : The standard covers bending angles typically ranging from 0 raised to the composed with power 180 raised to the composed with power Minimum Bending Radii
: It specifies the smallest allowable radii based on steel grade and thickness to prevent cracking. Material Behavior
: During bending, the material thickness in the rounded portion can reduce by up to Rolling Direction
: For best results, bending should ideally be performed transverse (perpendicular) to the rolling direction of the steel to avoid structural failure. Calculating Developed Length One of the primary uses of DIN 6935 is calculating the stretched length
) of a part before it is bent. This is done using a compensating value (
) that accounts for the shift in the "neutral fiber" of the material. A common simplified formula for the developed length is: leg lengths cap L equals sum of leg lengths plus sum of v
(the compensation value) is determined by the bending angle and the ratio of the internal radius ( ) to the material thickness ( Permissible Deviations
The standard also outlines how much a bend can deviate from the intended radius depending on the steel grade: Steel Grade Thickness up to 3mm Thickness 3mm to 8mm S235 (JR/JO/J2) S275 (JR/JO/J2) S355 (JR/JO/J2) Where to Access the Standard While the full official document must be purchased from
or authorized distributors, technical summaries and partial translations are often hosted on engineering platforms: frequently hosts English translations and guidelines. Modulus Metal
provides concise tables for minimum bending radii and deviations. for a particular material thickness? DIN 6935 Cold Bending of Flat Rolled Steel - Modulus Metal
