helen@hbxinnuorollforming.com
One machine produces IBR and corrugated roofing panels alternately
Upper roller set forms trapezoidal ribs lower set forms wave profile
Heavy structural frame resists vibration during continuous roof sheet runs
Flying hydraulic shear cuts formed roofing panel without line stoppage
PLC touch controller programs roof sheet length and production batch count
Hard chrome roller surface preserves galvanized coating during bending
Complete roof sheet line fits one container reducing international freight
This heavy-duty double layer roof roll forming machine is purpose-built for the continuous production of steel roofing panels used in residential, commercial, agricultural, and industrial building construction worldwide. The upper forming deck is configured to manufacture IBR (Inverted Box Rib) trapezoidal roof sheets — a high-strength profile engineered for long-span structural roofing that resists wind uplift and supports substantial live loads. The lower forming deck produces traditional corrugated roof sheets — the time-tested sinusoidal wave panel that has roofed homes, barns, warehouses, and community buildings across every continent for over a century. Housing both roof panel production capabilities in a single machine frame gives roof sheet manufacturers the flexibility to serve premium and economy segments of their local construction market from one investment.
| Roof Panel Feature | IBR Trapezoidal Roof Sheet | Corrugated Roof Sheet |
|---|---|---|
| Profile Shape | Deep trapezoidal ribs, flat valley pans between ribs | Continuous sine-wave curvature, uniform thickness throughout |
| Cover Width Options | 762 / 840 / 925 / 1000 / 1050 / 1100 mm | 660 / 750 / 800 / 900 / 1000 mm |
| Rib/Wave Depth | 28–43 mm rib crown height | 12–18 mm crest-to-trough amplitude |
| Span Capability | Up to 4.5m between purlins (wind zone dependent) | Up to 2.5m between purlins (wind zone dependent) |
| Wind Uplift Resistance | High — deep ribs create structural stiffening channels | Moderate — requires closer fastener spacing in cyclone regions |
| Minimum Roof Pitch | 5 degrees (with sealed side laps) | 10 degrees (standard); 7.5 degrees (with sealed end laps) |
| Typical Building Types | Warehouses, factories, shopping centers, aircraft hangars, school halls | Houses, farm sheds, livestock barns, garages, perimeter walls |
| Structural Element | Material and Method | Role in Roof Sheet Production |
|---|---|---|
| Foundation Base | Welded heavy channel steel grid with diagonal cross-bracing | Absorbs dynamic forming forces and prevents frame twist during high-speed continuous roof sheet runs |
| Vertical Support Columns | 350H–400H structural H-beam steel, bolted and gusset-welded at base | Carries the dead weight of the upper roller deck plus live forming loads transmitted through both decks simultaneously |
| Roller Bearing Mounts | Machined steel pads welded to column faces, precision-faced flat | Guarantees exact shaft-to-shaft parallelism so every roller station applies uniform bending force to the roof sheet strip |
| Upper Deck Roller Assembly | 14–18 pairs of IBR-contour rollers on Φ75–80mm alloy shafts | Progressively shapes the flat coil strip into a finished IBR roof panel with defined rib geometry, valley flatness, and side-lap profile |
| Lower Deck Roller Assembly | 13–16 pairs of wave-contour rollers on Φ75–80mm alloy shafts | Progressively shapes the flat coil strip into a finished corrugated roof sheet with consistent wave pitch and uniform curvature |
| Drive Transmission | Single motor → dual-output worm gearbox → two independent double-row chain loops | Delivers synchronized rotational speed to both decks; chain tension individually adjustable without affecting the opposite deck |
| Production Stage | Operation | Quality Standard |
|---|---|---|
| Raw Material Selection | 45# medium carbon steel billet, ultrasonic tested for internal flaws | ASTM A29 / GB/T 699 equivalent; rejection of billets with inclusions or porosity |
| CNC Profile Turning | CNC lathe with custom-ground form tool, single-setup machining | Profile contour within ±0.05mm of engineering drawing across full roller circumference |
| Case Hardening | Controlled-atmosphere carburizing furnace, oil quench | Surface hardness HRC 58–62; case depth 0.8–1.2mm; core toughness retained |
| Chrome Electroplating | Industrial hard chrome bath, controlled current density and deposition time | Minimum deposit thickness 0.05mm; uniform coverage; no pits, nodules, or edge buildup |
| Final Inspection | Coordinate measuring machine or profile template comparator | 100% dimensional check on each roller before assembly into station pair |
| Cutting Parameter | Technical Specification |
|---|---|
| Cutting Method | Flying hydraulic post-cut — shear carriage travels synchronously with the moving roof sheet during the cut cycle, then returns to home position |
| Blade Material Grade | Cr12MoV cold-work die tool steel, vacuum heat treated, double tempered |
| Blade Hardness | HRC 60–64 across the full cutting edge length |
| Blade Profile | Upper and lower blades ground to match the specific roof sheet cross-section (IBR or corrugated), ensuring the cut follows the panel contour without crushing the profile |
| Hydraulic Power Unit | 4.0kW motor + gear pump; 16–21 MPa working pressure; 80L oil reservoir with breather filter, sight glass, and oil cooler |
| Cutting Accuracy | ±1.0mm at any sheet length from 1.0m to 14.0m; PLC encoder feedback with real-time length compensation |
| Cycle Time | Under 2 seconds from clamp engagement to blade retraction; machine continues forming without interruption |
| Blade Service Interval | Approx. 500,000 cuts before re-sharpening or replacement is required under normal operating conditions |
| Technical Parameter | Specification Data |
|---|---|
| Suitable Coil Materials | Hot-dip galvanized steel (GI), pre-painted galvanized iron (PPGI), aluzinc/Galvalume (AZ150–AZ200), cold-rolled steel strip, aluminum 1100/3003 alloy sheet |
| Coil Thickness Processing Range | 0.25mm to 0.80mm (equivalent to gauge 30 through gauge 20) |
| Coil Width Before Forming | IBR deck: 1000–1250mm flat strip / Corrugated deck: 914–1220mm flat strip |
| Coil Inner Diameter | Φ508mm standard; Φ610mm available with decoiler mandrel adapter |
| Decoiler Load Capacity | 5 metric tons or 8 metric tons depending on model selection |
| Roof Sheet Production Speed | 10–18 linear meters per minute, stepless adjustable via VFD inverter control dial |
| Sheet Cut Length Range | 1.0m minimum to 14.0m maximum per roof panel |
| Main Drive Motor | 5.5kW or 7.5kW AC induction, 4-pole, 1440 rpm, IP54 protection class |
| Gearbox Type | Worm gear speed reducer with dual output shafts; reduction ratio 1:40 or 1:59; oil-bath lubricated |
| Hydraulic Pump Motor | 4.0kW output, direct-coupled to gear-type hydraulic pump, 16–21 MPa system pressure |
| PLC Brand Selection | Siemens S7-1200 series / Delta DVP series / Mitsubishi FX3U series per customer preference |
| HMI Touchscreen | 7-inch or 10-inch color LCD, multi-language operator interface with programmable sheet-length recipe memory |
| Electrical Supply | 380V 50Hz 3-phase standard; custom voltage and frequency (220V/415V/440V/480V, 50/60Hz) configured to destination country |
| Profile Changeover Method | Manual diverter plate repositioning; switch from IBR to corrugated roof sheet production in approximately 10–15 minutes |
| Machine Dimensions | Approx. L 7.0–8.0m × W 1.4–1.6m × H 1.7–2.0m depending on roller count and frame specification |
| Machine Net Weight | 5.0 to 7.5 metric tons depending on profile configuration ordered |
| Position | Equipment Name | Function in Roof Sheet Manufacturing |
|---|---|---|
| 1 | Hydraulic Mandrel Decoiler | Supports the steel coil on an expanding hydraulic mandrel; pays out the strip under controlled brake tension to prevent slack or over-tension feeding into the forming deck |
| 2 | Strip Entry Guide Table | Side-alignment roller rails center the strip on the machine axis; integrated manual guillotine pre-shear blade trims the coil leading edge square prior to threading |
| 3 | Main Double Layer Roll Forming Machine | Core production unit combining upper IBR roof sheet deck and lower corrugated roof sheet deck on a single welded structural steel frame with shared drive and cutting systems |
| 4 | Hydraulic Flying Post-Cut Station | Carriage-mounted Cr12MoV alloy blade assembly; pneumatic clamp holds the roof sheet during cut; hydraulic cylinder drives the blade through the profile cross-section |
| 5 | PLC Electrical Cabinet | Weatherproof IP54 steel enclosure containing PLC processor, VFD inverter, relays, contactors, overload protection, and terminal connection blocks |
| 6 | Run-Out Roller Conveyor | 3m–5m free-roller receiving table with adjustable-height legs; catches finished roof sheets as they exit the shear and supports them for manual stacking and bundling |
| Stage | Operation | Description |
|---|---|---|
| 1 | Coil Loading | Steel coil is crane-lifted onto the hydraulic decoiler mandrel; expansion jaws securely grip the coil inner bore; the brake is engaged at the required drag setting to maintain steady strip tension |
| 2 | Strip Feeding | The coil leading edge is guided through the adjustable side rollers, centered on the machine axis, and trimmed square by the manual pre-shear guillotine blade before entering the selected roller deck |
| 3 | Deck Selection | Operator sets the pivoting diverter plate position — upward directs the strip into the IBR roof sheet upper deck; downward routes it into the corrugated roof sheet lower deck. Deck changeover is completed within approximately 10 minutes |
| 4 | Progressive Roll Forming | The flat steel strip passes through successive roller station pairs; at each station the metal is bent incrementally by a few degrees until, emerging from the final station, it has assumed the complete IBR rib shape or full corrugated wave contour |
| 5 | Length Measurement | A rotary pulse encoder mounted on the final forming shaft sends continuous digital pulses to the PLC; the controller compares the accumulated count against the operator-preset roof sheet length value entered on the touchscreen |
| 6 | Flying Shear Cut | On reaching the target length, the PLC activates the shear carriage to clamp the sheet and travel in synchronization with the moving panel; the hydraulic cylinder drives the Cr12MoV blade through the roof sheet profile; carriage and blade then return to the home position |
| 7 | Panel Stacking | The separated finished roof sheet slides onto the free-roller run-out table; the operator lifts each panel and stacks it onto the product pallet or bundle for storage, packaging, and dispatch to the construction site |
| Business Consideration | Two Separate Roof Sheet Machines | One Double Layer Roof Sheet Machine |
|---|---|---|
| Capital Equipment Cost | 100% of total price for two complete machines plus two decoilers | Approx. 65–75% of the two-machine total cost |
| Factory Floor Requirement | 44–70 m² for both roof sheet production lines | 20–35 m² for the single dual-purpose production line |
| International Container Shipping | Two × 20GP containers, two ocean freight charges | One × 20GP or 40HQ container, single ocean freight charge |
| Foundation and Electrical Work | Two concrete pads, two power cable drops, two electrical installations | Single concrete pad, single power cable drop, single electrical installation |
| Production Labor | 3–4 operators across two separate roof sheet lines | 1–2 operators for one roof sheet production line per shift |
| Energy Operating Cost | Two motors and two hydraulic pumps drawing power simultaneously | Single motor and single hydraulic pump; approximately 40% less electricity consumption |
| Spare Parts Holding | Two complete sets of wearing components in warehouse stock | One spare parts set covers both roller decks |
Every completed roof roll forming machine is subjected to a rigorous three-phase pre-shipment inspection. Phase one — dimensional audit: technicians measure all roller gaps at every station using calibrated feeler gauges against the engineering tolerance specification; shaft runout is verified at each bearing position with dial test indicators; frame levelness and squareness are confirmed with precision spirit levels and laser alignment instruments. Phase two — extended dry run: the machine operates continuously for a minimum of four hours at maximum rated speed without material; bearing housing temperatures are monitored and logged at 30-minute intervals using infrared thermometers; chain drive engagement is inspected visually and audibly for smooth, even tooth meshing; the PLC controller is cycled through every operational function — power-on, motor start, speed adjustment, length value input, batch quantity setting, recipe recall, emergency stop activation, and restart — to validate complete system integration. Phase three — live production trial: factory technicians load actual galvanized steel coil stock and produce 50 consecutive IBR roof sheets and 50 consecutive corrugated roof sheets; the length, rib geometry, wave pitch, and cut-edge quality of every 10th panel are measured with calibrated digital instruments and recorded against the product specification. Only machines achieving zero measurements outside published tolerance across all three inspection phases are approved for export packaging and container loading.
The main double layer machine body receives a comprehensive multi-layer protective packaging: first, a full wrap of VCI (volatile corrosion inhibitor) anti-rust film; second, high-density foam padding at all corners, edges, and protruding components; third, an outer layer of heavy-gauge UV-stabilized polyethylene shrink wrap for moisture and dust protection. The wrapped unit is bolted through its base frame to a fumigated ISPM-15 compliant plywood pallet or welded structural steel export skid. All auxiliary equipment items — the hydraulic uncoiler, run-out roller conveyor table, hydraulic power pack unit, and electrical control cabinet — are individually packed in purpose-built fumigated wooden crates with internal foam bracing and bolted tie-downs. A dedicated small accessories crate contains the operator hand tool kit, one starter set of spare wearing parts, and a complete printed technical documentation package: mechanical assembly drawings with exploded component identification views, electrical wiring schematics with terminal block and wire-number labeling, PLC parameter configuration reference guide, daily and weekly lubrication schedule chart with recommended grease specifications, and the comprehensive English-language operation and maintenance manual. Standard manufacturing lead time is 25–35 working days from confirmed deposit receipt and customer-signed profile approval drawings.
| Optional Upgrade | What It Adds to the Roof Sheet Production Line |
|---|---|
| Servo Motor Drive System | Programmable acceleration and deceleration ramps for smoother sheet handling; higher length precision; energy savings when the line runs in intermittent production mode |
| Automatic Panel Stacking Unit | Pneumatic or motorized stacking arm picks finished roof sheets from the run-out table and arranges them in neat, aligned bundles on a pallet — eliminates manual sheet handling and reduces labor cost |
| Powered Coil Transport Trolley | Battery-driven cart on floor-mounted guide rails with hydraulic scissor lift platform; safely transports coils up to 10 tons from warehouse storage to the uncoiler and lifts them onto the mandrel |
| IoT Production Monitoring Module | 4G cellular-connected device transmits real-time production data — daily sheet count, motor operating hours, fault diagnostic codes, and preventive maintenance interval alerts — to a smartphone application or web-based dashboard |
| Brand Logo Embossing Station | Custom-engraved roller pair installed in the forming sequence that permanently embosses a manufacturer brand name, logo, or production date code into each roof sheet during the roll forming process |
| Stainless Steel Roller Upgrade | Complete roller set manufactured from grade 304 or 316L austenitic stainless steel for roof sheet production in food-grade facilities, pharmaceutical plants, chemical processing environments, or high-salinity coastal locations |
