Rib Rolling and Punch Stages on Ribbed Ridge Cap Lines

1. Definition

On a ribbed (punched) ridge cap line, the process is more than continuous roll forming. After guiding, the strip receives dedicated rib rolling, then transverse rib punching, edge / large-side forming, and profile punching before hydraulic cut-to-length. Each stage needs matched dies and roll sets; the published ~15 m/min class reflects the full punch cadence, not pure rolling time alone.

Industry ridge guides likewise note optional inline hydraulic punch for ribs or fastener features — the ZTRFM ribbed FAQ makes those stages mandatory for this tier.

2. Process stages

1. Decoil and guide — typically ~3 t passive decoiler; strip guided into the rib section
2. Rib rolling — create standing / reinforcement rib geometry
3. Flat transverse rib punch — hydraulic punch bank matched to rib pitch
4. Edge (large-side) forming — roll stations finish the cover legs / edges
5. Profile punch — form/punch the ridge profile features
6. Forming cut — hydraulic cut-to-length; discharge table

Drive context: wall-panel style chain drive; whole-shaft roll beds; servo drive for stop accuracy on punch/cut. Dies and knives commonly Cr12MoV quenched.

• Color-steel ribbed / punched ridge caps for metal roof systems
• Projects that need embossed transverse ribs for stiffness or appearance — not a plain 312 cover

3. Reference parameters (ribbed punch host)

Conflict call-out: the same leaf’s 312 simple ridge FAQ cites ~8–12 m/min, main ~3 kW, ~11 rolls, shaft ~φ60, thickness ~0.3–0.5 mm. Never substitute 312 stand count or power for the ribbed punch layout.

4. Boundaries

• Not a trapezoidal / IBR roof-sheet main line
• Not the 312 simple ridge process (decoil → form → cut only)
• Punch dies must match rib pitch and cover width — do not reuse unrelated ridge dies
• Industry “optional punch” ads are context; this tier treats rib roll + multi-punch as core stations

5. Buyer FAQ

Does 15 m/min mean continuous flying cut?

No. The ribbed FAQ describes servo stop accuracy for punch/cut. Treat ~15 m/min as the rated forming/punch cadence on the named technical sheet, not a flying-shear guarantee.

Can I quote 312’s 3 kW as this machine?

No. Ribbed punch uses servo ~5.5 kW and hydraulic ~11 kW with extra punch tooling.

What must match before FAT?

Finished ridge drawing: cover width, rib pitch, transverse punch layout, edge geometry, and cut length tolerance.