01Radius
Inside radius
Set a practical radius for the material and thickness; tooling and forming method determine the achieved value.
Cut and bent parts in one order.
Upload the formed part, choose an eligible material and thickness, and keep laser cutting, bend geometry and finishing in one production flow.
CNC formingControlled ram and backgauge positions
Air bendingFlexible angles with selected punch and die
Bend sequenceTool access is checked for every operation
Material-ledRadius and springback vary with the sheet
Start with the finished dimensions.
Supply the formed STEP geometry or a drawing that shows bend direction, angle, inside radius and the flange dimensions that matter. Metalldel develops and reviews the blank against the selected material and available tooling.
The quote is based on a manufacturable sequence, not only a visible final shape. Short flanges, returns, nearby holes and tool collisions are checked before the part is accepted for online production.
Supply the finished geometry or a drawing with bend direction, inside radius, angle and critical flange dimensions.
Design around the bend line before the sheet reaches the brake.
02Tool contact
Minimum flange
A flange must reach the die and backgauge correctly. Very short legs may require another tool or design change.
03Clearance
Features near the bend
Holes, slots and notches can stretch or distort when placed too close to the deformation zone.
04Material
Grain and springback
Rolling direction and material strength can affect cracking risk, bend force and angular springback.
Available materials for press-brake bending.
Loading current material availability…
Bend eligibility also depends on flange length, radius, tool access and sequence.
Standard tooling and capacity
Standard values for 90° air bending on a 200 t / 3000 mm machine, with a published force limit of 170 t and K-factor 0.42.
| Thickness (t) | V-die | Inside radius (Ri) | Min flange (h) | K-factor | S355 max L | 304/304L max L | Al max L |
|---|---|---|---|---|---|---|---|
| 0.5 | V8 | 1.3 | 5.7 | 0.42 | 3000 | 3000 | 3000 |
| 0.8 | V8 | 1.3 | 5.7 | 0.42 | 3000 | 3000 | 3000 |
| 1 | V8 | 1.3 | 5.7 | 0.42 | 3000 | 3000 | 3000 |
| 1.5 | V12 | 1.9 | 8.5 | 0.42 | 3000 | 3000 | 3000 |
| 2 | V16 | 2.6 | 11.4 | 0.42 | 3000 | 3000 | 3000 |
| 2.5 | V22 | 3.5 | 15.6 | 0.42 | 3000 | 3000 | 3000 |
| 3 | V22 | 3.5 | 15.6 | 0.42 | 3000 | 3000 | 3000 |
| 4 | V35 | 5.6 | 24.8 | 0.42 | 3000 | 3000 | 3000 |
| 5 | V35 | 5.6 | 24.8 | 0.42 | 3000 | 3000 | 3000 |
| 6 | V50 | 8.0 | 35.5 | 0.42 | 3000 | 3000 | 3000 |
| 8 | V63 | 10.1 | 44.7 | 0.42 | 2350 | 2220 | 3000 |
| 10 | V80 | 12.8 | 56.8 | 0.42 | 1910 | 1800 | 3000 |
| 12 | V100 | 16.0 | 71.0 | 0.42 | 1660 | 1560 | 3000 |
Ri = indicative inside radius. h = recommended minimum flange/support dimension from the bend line. Max L = maximum bend length, limited to 170 t and 3000 mm. Thicknesses above 12 mm, non-standard radii, short flanges and critical tolerances require individual review.
CAD values - 90° bend
Useful when entering sheet-metal rules in CAD. BA = Bend Allowance; BD = Bend Deduction.
| Thickness (t) | V-die | Inside radius (Ri) | BA 90° | BD 90° | K-factor |
|---|---|---|---|---|---|
| 0.5 | V8 | 1.3 | 2.34 | 1.22 | 0.42 |
| 0.8 | V8 | 1.3 | 2.54 | 1.62 | 0.42 |
| 1 | V8 | 1.3 | 2.67 | 1.89 | 0.42 |
| 1.5 | V12 | 1.9 | 4.01 | 2.83 | 0.42 |
| 2 | V16 | 2.6 | 5.34 | 3.78 | 0.42 |
| 2.5 | V22 | 3.5 | 7.18 | 4.86 | 0.42 |
| 3 | V22 | 3.5 | 7.51 | 5.53 | 0.42 |
| 4 | V35 | 5.6 | 11.44 | 7.76 | 0.42 |
| 5 | V35 | 5.6 | 12.10 | 9.10 | 0.42 |
| 6 | V50 | 8.0 | 16.52 | 11.48 | 0.42 |
| 8 | V63 | 10.1 | 21.11 | 15.05 | 0.42 |
| 10 | V80 | 12.8 | 26.70 | 18.90 | 0.42 |
| 12 | V100 | 16.0 | 33.05 | 22.95 | 0.42 |
CAD formula: BA = angle(rad) × (Ri + K × t). For a 90° bend, BD = 2 × (Ri + t) - BA. Values are practical standard settings for air bending and are intended as design guidance. Actual radius and flat pattern may vary with material grade, tensile strength, grain direction and springback. Critical dimensions should be verified before series production.
Confirm the bend sequence before production.
1 bend
Single-angle parts
One controlled bend for brackets, flanges and simple angle profiles.
Sequence
Channels and trays
Multiple bends require a planned order so previously formed flanges remain clear of the tooling.
Access
Return flanges
Tight returns and closed profiles need tool-access review and may require special tooling or a revised geometry.
A bending workflow that keeps finished dimensions visible.
Read the formed model
Confirm bend lines, direction, angles, radii and critical dimensions.
Develop the blank
Apply material- and process-specific bend allowance to the flat pattern.
Plan tools and sequence
Select punch, die and operation order while checking collision and flange access.
Form and verify
Bend the part and check the agreed angle and dimensional requirements.
Preparing a bent-part order
What should my bending file show?
Upload the finished 3D geometry with the intended material, thickness, bend radii and angles. STEP is preferred when the formed shape must be analysed.
How close can a hole be to a bend?
Clearance depends on thickness, radius and tooling. Use the bending table as a starting point; the submitted geometry receives the final check.
Do I need to calculate the flat pattern?
Provide the finished part geometry. Metalldel evaluates eligible bends and the production blank against the configured material and tooling.
Why might a bent part require manual review?
Short flanges, tool access, collisions, closed shapes and features near bends can require a production decision before pricing.
Build the bend into the part—not into a later correction.
Upload the formed geometry and let the material, tooling and sequence be reviewed together.