Bending Force Calculator

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For more information, consult our die catalog.

Sheet Metal Bending Diagram

Required Force:

Minimum Bending Tool Resistance:

Minimum Flange Length (B):

Minimum Inside Radius (R):

Recommended machines will appear here after calculation.

Die Opening (V) Colors

The recommended die opening depends on the working range (V/t ratio), where V is the die opening and t is the sheet thickness. This ratio defines the balance between precision, bend quality, and machine effort.

Narrow Range (High Quality)
Ratio: 7 to 7.5t

Used when very precise radii and angles are required, or when flanges are short.
Advantage: High finish quality.
Consideration: Risk of very short flanges falling into the die groove, affecting aesthetics or marking the part.

Production Range (Recommended Default)
Ratio: 8 to 9t

The most balanced for most jobs.
At 8t, the required force is moderate, with adequate radii and minimum flanges.
Offers the best ratio between bend quality and machine effort.

Extended Range (Special Cases)
Ratio: 6t, 10 to 12t

Used only when the design demands it or if the machine does not reach the necessary tonnage.
At 6t: Required force increases ($+33\%$), the radius is reduced, and visible marks appear on the sheet due to aggressive contact.
At 12t: Force decreases ($-33\%$), but the radius widens significantly and minimum flanges become very large, which may be unacceptable for precision drawings.

Technical Note: The working range defines the viable V/t ratio range where the process is stable. The closer to the lower limit, the higher the precision and required effort; towards the upper limit, lower effort but larger radii and flanges.
Example: For a 4 mm sheet, working on an 8t die implies an opening V = 32 mm.

The Bending Force Calculator provided by FORZA Laser is designed to provide reference estimates based on standard formulas and typical material values. The results obtained should be considered as an initial guide and not as definitive values for industrial or critical engineering applications. It is highly recommended that you consult with a specialized technician or engineer before making any decisions based on these calculations, as there may be additional factors influencing actual results, such as specific working conditions, material tolerances, manufacturing variations, and regulatory requirements. The availability of this resource does not replace professional advice.