Confirm what integration needs to achieve
Identify the connectors, cables or assembly steps the integrated structure is intended to replace. Compare that benefit with serviceability: a fault in one section may require replacing the integrated assembly. Review stiffened flex versus rigid-flex when the actual requirement is only local support beneath a component.
Rigid-flex boundary information
| Boundary | Required definition | Risk to review |
|---|---|---|
| Rigid to flex | Region stack and transition outline | Loads at the stiffness change |
| Flat to installed | Fold sequence and final envelope | Assembly collisions |
| Bare board to assembly | Support and test access | Hidden joints or inaccessible probes |
Release geometry in flat and formed states
Define regional stacks, rigid outlines, bend locations, intended radius and fold sequence. A rigid-flex stackup should make clear which conductors continue through the flexible region. Include component heights and assembly access in the formed model.
CAD tools can represent region stacks and fold geometry, but that model is an intent and interference check. It does not establish material life or manufacturing tolerance. Show the controlling datums and acceptable installed envelope in drawings, especially when several rigid sections must locate in one enclosure.
Agree the assembly and inspection plan early
Specify which regions support components, how the flat assembly is handled and when forming occurs. Review access for connectors, fasteners and test probes after folding. Ask which construction records and electrical tests will accompany the build. Prototype evaluation should include the actual sequence of insertion, forming and fastening, because the completed shape can hide an assembly conflict.
Before you release the design
- State why integration is preferable for the product.
- Dimension every rigid region from explicit datums.
- Provide regional stacks and an installed model.
- Review test and replacement access after final folding.
Watch points
- A rigid support glued to flex is not the same specification as an electrically interconnected rigid-flex region.
Practical questions
Does a folded CAD model prove the design is ready?
No. It communicates geometry. Manufacturing tolerances, stack details, assembly handling and any repeated-motion requirement still need review and verification.
Can rigid-flex simplify assembly?
It may remove separate interconnect operations, but compare the whole sequence, including forming, fixtures, testing and repair. The benefit is application-specific.
Technical references
References support the material or design context. Check the exact grade, part number, document revision and project conditions before release.Updated 27 September 2026 · Technical content policy · Engineering guidance supports project review; the agreed drawing defines the build.