Roll Forming CAE / Simulation Software

1. Definition

Roll forming CAE (computer-aided engineering) means using numerical models—most often nonlinear elastoplastic finite element analysis (FEA)—to predict how strip behaves as it passes through successive roll stations. Specialized packages automate model build from flower/roll designs so designers can run a “virtual mill” before cutting hardened tooling.

2. Why Simulate Roll Forming

• Reduce costly trial-and-error on the machine
• Screen flower strategies for edge wave, twist, bow, and overstrain
• Estimate forming forces / torques and contact pressures
• Iterate roll geometry before steel is cut
• Capture know-how when results feed back into design tools

Vendor and integrator materials emphasize that complex or flexible multi-profile programs benefit most; simple channels may still be designed empirically, but CAE pays off when scrap or re-cut rolls are expensive.

3. Link to Flower / Roll Design

Modern roll-form design suites (e.g. COPRA RF ecosystem descriptions) create flower patterns, strip-width calculations, and roll drawings, then hand geometry to an FEA module. Simulation results can push designers to add stations, change bend increments, or adjust gaps. Some workflows support automatic flower adaptation after analysis.

Coated/laminated zones can be visualized in design so surface-risk areas stay visible across the line concept.

4. What FEA Typically Computes

data M descriptions of COPRA FEA RF highlight automated FE model creation, nonlinear elastoplastic calculation, and visualization of forces, torques, stresses, and strains without requiring a dedicated FEA specialist for routine use.

5. Defect Prediction

Integrator notes (e.g. Samco on COPRA FEA) list edge wave, twist, and bow among issues addressed virtually before rolls are manufactured. Simulation does not magically eliminate defects; it ranks flower options and highlights risky stations for redesign.

6. Material Cards and Friction

Garbage-in/garbage-out applies:

• Yield, hardening (n), anisotropy (r), thickness
• Friction model (constant μ vs advanced)
• Stand rigidity / gap assumptions when the software supports them

A soft trial coil in the shop will not match a high-yield production card in CAE—align certificates with the material model.

7. Typical Workflow

1. Design flower and rolls in CAD/RF software
2. Assign material and friction
3. Auto-generate FE mesh / model
4. Run nonlinear simulation (may use multi-CPU options for long models)
5. Review shape, strains, forces
6. Modify flower/rolls; re-simulate
7. Release drawings for roll manufacture
8. Confirm with short proving strip on the machine

8. Industry Tooling Context (COPRA family)

Public product pages for COPRA FEA RF (data M Sheet Metal Solutions) describe automated model creation from COPRA RF, virtual tryout of roll sets, and feedback into design. Parallel calculation options exist for long station counts. This encyclopedia cites that ecosystem as a widely documented example—not as an exclusive endorsement. Other general-purpose FEA tools can model roll forming with more manual setup.

9. Limits of Simulation

• Cannot replace lubricant chemistry surprises on painted coil
• Cannot see every mill heat variation unless you update cards
• Mesh and contact settings affect results
• Machine wear, foundation, and operator practice still matter

Treat CAE as a powerful design filter, not a shipping certificate.

10. When Plants Should Insist on CAE

• High-strength / AHSS profiles
• Tight cosmetic painted products
• Many stations / complex flowers
• Quick-change flexible tooling programs
• Expensive carbide or multi-set roll inventories

11. Buying / Spec Tips for OEMs

1. Ask whether flower design includes FEA review
2. Request which defects were screened
3. Request material assumptions used
4. Keep a copy of the final flower with simulation revision ID

12. Boundaries

• CAE ≠ machine PLC.
• Simulation force ≠ nameplate kW without drive-train context.
• This page does not sell software licenses or quote prices.

13. Buyer / Engineer FAQ

Do I need FEA for every C-purlin?

Not always. Standard flowers with known coils may rely on experience. Insist on CAE when risk or novelty is high.

Can simulation remove all tryout?

No. It reduces tryout loops. Always prove critical jobs on metal.

Who should run the software?

Specialized RF packages market designer-level usability; complex contact issues may still need an analyst.

How does springback appear in CAE?

Through unloading / residual deformation in the elastoplastic model. See Springback and Compensation pages.

Will wrong μ ruin the study?

It can skew forces and some shape errors. Sensitivity-study friction.

Is COPRA the only option?

It is a prominent dedicated ecosystem. General FEA codes can work with more setup effort.

14. Practice Notes

Archive simulation inputs with the roll drawing package. Six months later, nobody will remember which yield and μ produced the green light.

When the shop coil differs from the CAE card by a large yield step, expect the proving strip to disagree—update the model or retune stands deliberately.

• Name files with profile + revision + material ID
• Screenshot critical strain hotspots into the tryout report
• Do not “fix” geometry in CAD without re-running FEA on severe jobs

1. Confirm material card vs MTC
2. Confirm friction assumption
3. Confirm station count matches drawings
4. Confirm defect checklist reviewed
5. Confirm proving plan after install

Training tip: designers should walk the first proving strip with operators so virtual predictions connect to real gauges and sighting methods.

Quality tip: if customer APQP asks for formability evidence, attach both FLC/n data (when stretch matters) and roll-form FEA summaries for bend-dominated profiles.