01
Material and grain
Confirm exact grade, condition, thickness range, rolling direction and cosmetic face before selecting radius and orientation.
Evidence route
Material callout, certificate scope and grain/orientation note
Sheet-metal forming engineering
Sheet-metal bending: connect material behaviour, tooling and final datums.
Bend allowance, deduction, radius and springback depend on the material condition, thickness, grain, tooling and forming route. PartVerity closes the bend model, feature relationships, sequence and verification state before formed dimensions are treated as controlled.
Decision premise
Bending question: which approved model and tool route preserve the functional relationships after the part leaves the press brake?
Engineering control
Six controls for a stable forming route
Generic bend tables are starting assumptions, not project evidence. The selected supplier must reconcile flat development, tooling and inspection with the released geometry.
02
Bend model and tooling
Align inside radius, angle, K-factor or deduction assumptions with punch, die, air/bottom forming route and supplier practice.
Evidence route
Bend table/model, tooling basis and supplier confirmation
03
Feature proximity
Review holes, slots, embosses, reliefs and short flanges near bends for stretching, marking, collision or unsupported forming.
Evidence route
Bend-risk annotation and approved DFM disposition
04
Sequence and access
Plan bend order, back-gauge references, flange access and collision clearance for the complete part, not each bend in isolation.
Evidence route
Bend sequence and inaccessible-feature exceptions
05
Springback and restraint
Separate free-state requirements from dimensions taken in fixtures and define how angular or profile correction is validated.
Evidence route
Measurement state, fixture definition and actual results
06
Final datum verification
Measure functional hole, edge and face relationships after all forming operations using an agreed datum scheme.
Evidence route
Formed-part datum setup, method and dimensional report
Decision matrix
Bend condition to verification decision
The table structures engineering review; it does not publish universal minimum radii or tolerance promises.
| Bend condition | Control response | Verification priority |
|---|---|---|
| Critical holes across bends | Datum and bend-stack review | Final relationship after all bends |
| Short flange or nearby feature | Tool-access and deformation review | Feature shape, flange size and angle |
| Cosmetic outer surface | Protected tooling/film and bend-mark plan | Defined visual zone after forming |
| High springback material | Supplier-specific compensation and trial plan | Free-state angle/profile evidence |
| Multi-bend enclosure | Controlled sequence and cumulative-tolerance review | Assembly interfaces and final datum frame |
Claim boundaries
What a bend callout does not prove
A nominal inside radius does not identify the actual tooling route.
A flat-pattern calculation does not prove final angle or hole relationship.
A dimension measured while restrained may not represent the released part.
Changing material condition can invalidate bend assumptions.
Technical context
Use guidance to frame the review—not to replace project evidence.
External context for bend allowance, neutral axis, springback, relief and tooling interaction. Project values are confirmed with the selected fabricator.
Geomiq sheet-metal design guide