helen@hbxinnuorollforming.com
Open-type trapezoidal floor deck cold roll forming production line
Twin motor chain drive, hardened 45# steel CNC forming rollers
Dimple embossment station with clutch anti-pooling protection
Dual-cylinder floor shear, gravity stack output, PLC auto batch
An open floor deck machine is a continuous cold roll forming line that produces open-type (trapezoidal rib) steel decking panels — the most widely used permanent formwork system in composite concrete floor construction globally. "Open" refers to the exposed trapezoidal rib profile on the panel underside, which allows concrete to flow around and mechanically bond with the steel through embossed dimples on the rib surfaces. This is the standard deck type for 80%+ of steel-frame building projects worldwide due to its cost-effectiveness, proven engineering performance, and ease of on-site installation compared to closed (dovetail) deck alternatives.
| Factor | Open Deck Machine | Closed Deck Machine |
|---|---|---|
| Profile Shape | Trapezoidal ribs, wide open underside | Re-entrant dovetail ribs, narrow throat |
| Forming Stations | 22–28 rows | 32–36 rows (more complex geometry) |
| Roller Complexity | Standard progressive trapezoidal tooling | Requires special locking roller set for dovetail fold-over |
| Machine Cost | Lower — fewer stations, simpler tooling | 15–25% higher due to additional forming stages |
| Material Gauge | 0.8–1.5mm commonly | 0.8–1.2mm typically (thinner for dovetail forming) |
| Production Speed | 10–15 m/min | 8–12 m/min (more forming resistance) |
| Global Market Share | 80–85% of floor deck volume | 15–20%, mainly spec-driven long-span projects |
| Concrete Bond Mechanism | Embossed dimples + mechanical keying | Geometric interlock + embossments |
| Profile Code | Coverage Width | Rib Pattern | Rib Depth | Coil Input | Weight per m² |
|---|---|---|---|---|---|
| OD-510 | 510mm | 2 ribs | 50mm | 750mm × 0.8–1.2mm | 8.5–12.7 kg |
| OD-600 | 600mm | 3 ribs | 50mm | 1000mm × 0.8–1.2mm | 8.5–12.7 kg |
| OD-688 | 688mm | 2 ribs | 76mm | 1000mm × 0.8–1.5mm | 10.2–19.1 kg |
| OD-720 | 720mm | 3 ribs | 51mm | 1000mm × 0.8–1.2mm | 8.7–13.0 kg |
| OD-750 | 750mm | 3 ribs | 53mm | 1000mm × 0.8–1.5mm | 9.0–16.8 kg |
| OD-780 | 780mm | 3 ribs | 50mm | 1000mm × 0.8–1.2mm | 8.5–12.7 kg |
| OD-870 | 870mm | 3 ribs | 60mm | 1250mm × 0.8–1.5mm | 9.8–18.3 kg |
| OD-900 | 900mm | 3 ribs | 75mm | 1250mm × 0.8–1.5mm | 10.5–19.6 kg |
| OD-915 | 915mm | 3 ribs | 76mm | 1250mm × 0.8–1.5mm | 10.8–20.2 kg |
| OD-990 | 990mm | 3 ribs | 50mm | 1250mm × 0.8–1.2mm | 8.5–12.7 kg |
| OD-1000 | 1000mm | 3 ribs | 50mm | 1250mm × 0.8–1.5mm | 8.5–16.8 kg |
| OD-1025 | 1025mm | 3 ribs | 51mm | 1250mm × 0.8–1.5mm | 8.7–16.8 kg |
The dimple pattern pressed into the rib surfaces is the critical mechanical bond interface between the steel deck and the concrete slab. Without properly formed embossments, the composite action fails and the deck functions only as lost formwork — losing all tensile reinforcement benefit. This machine uses a clutch-governed dimple roller station engineered for consistent, deep embossment formation across the full coil width, with the following design features:
| Feature | Purpose | Failure Mode If Absent |
|---|---|---|
| Clutch disengagement after strip entry | Syncs dimple wheel speed with downstream forming speed | Overspeed — dimple wheel spins faster than forming rollers, tearing sheet surface |
| Hardened Cr12MoV dimple inserts | Wear-resistant embossment pattern that maintains sharpness across millions of cycles | Blunted dimples — shallow embossments, reduced concrete bond strength |
| Adjustable embossment depth setting | Calibrate dimple depth for different material gauges and yield strengths | Under-embossed for thick material or over-penetration on thin gauge |
| Quick-change cassette design | Swap embossment pattern without disassembling the forming line | Hours of downtime for tooling changeover |
| Component | Specification | Operational Role |
|---|---|---|
| Mandrel Type | Hydraulic expansion, 4-segment wedge shoes | Grips coil ID securely; fits 450–520mm standard coil ID |
| Load Capacity | 5 tons (standard), 8 tons (reinforced option) | Supports 3–4 hours of continuous run at 10 m/min before coil change |
| Drag Brake | Adjustable friction band with pneumatic assist | Prevents coil over-spin during deceleration; maintains constant strip tension |
| Side Guide Rollers | Hardened steel, manual width adjustment with scale | Centers strip to ±1mm before entering leveler; prevents edge misalignment in first forming station |
| Entry Leveler | 5-roller flat-straightening unit, top roll adjustable | Removes coil set curvature; ensures flat strip entry into first forming row |
| Coil Car (Optional) | Hydraulic lift trolley with V-cradle, rail-guided | Reduces coil changeover time to under 5 minutes; eliminates overhead crane dependency |
| Symptom | Likely Cause | Corrective Action |
|---|---|---|
| Panel edge wave / rippling | Uneven roller pressure across width; worn bearings on one side | Re-calibrate roller gap with feeler gauge at each station; replace bearing set on affected side |
| Sheet drifting to one side | Entry guide misalignment; uneven drag brake on decoiler | Center side guides with measurement from frame centerline; adjust brake pad balance |
| Dimples too shallow or missing | Worn dimple inserts; clutch not engaging properly | Replace dimple insert set; inspect clutch engagement timing and adjust trip mechanism |
| Panel length inconsistent | Encoder wheel slipping; shear trigger delay | Clean encoder wheel surface; check encoder coupling tightness; recalibrate PLC shear delay parameter |
| Surface scratching along ribs | Roller surface damage; chrome plating worn through | Polish affected roller with fine-grit compound; schedule re-chroming if base steel exposed |
| Chain jumping / loud knocking | Chain elongation beyond 3%; sprocket tooth wear | Replace chain set; inspect sprocket teeth — replace if hooked or sharpened profile |
| Hydraulic shear incomplete cut | Blade edge dull; hydraulic pressure below spec | Re-grind or replace Cr12MoV blade set; check pump pressure gauge and relief valve setting |
Understanding the end-user workflow helps machine buyers plan their production output. Below is the standard sequence for installing open floor deck panels at a construction site — a typical crew of 3 installers can lay 300–400m² of deck per shift depending on panel length and crane access.
| Step | Action | Tools Required |
|---|---|---|
| 1. Layout & Marking | Snap chalk lines on steel beams to mark panel edge positions per shop drawing | Chalk line, measuring tape, shop drawings |
| 2. Panel Lifting | Bundle-lift panels to deck level using crane with spreader bar; distribute bundles along beam line | Crane, spreader bar, tag lines |
| 3. Placement | Position each panel across supporting beams; ensure minimum 50mm bearing at each end | 2-person manual handling for panels under 6m |
| 4. Fastening | Shot-fire shear studs through deck into steel beam (or use self-drilling screws for lighter loads) | Stud welding gun, power source, studs |
| 5. Side Lap Connection | Stitch-screw adjacent panel side laps at 450mm centers to prevent grout leakage | Screw gun, self-drilling screws |
| 6. Edge Closure | Install perimeter edge form and pour-stop angles to contain concrete at slab edges | Angle grinder, fasteners |
| 7. Reinforcement Placement | Lay mesh reinforcement on plastic chairs above deck ribs per structural design | Manual placement, wire ties |
| 8. Concrete Pouring | Pump concrete onto deck; screed to finish level; cure per specification | Concrete pump, screed, power trowel |
Hebei Xinnuo is a professional cold roll forming machinery manufacturer with 20+ years of experience. We specialize in C/Z purlin machines, roof panel roll formers, floor deck machines, and custom profile solutions — exported to 50+ countries worldwide.
