Plate Rolling Series
Hydraulic Four Roll Plate Bending Machine
Premium hydraulic four roll plate bending machine engineered for the highest precision cylindrical forming, cone rolling and complex shape bending of steel plates. The KAVDO Four Roll Plate Bender features a unique top-roll / bottom-pinch-roll clamping design that grips the plate securely during one-pass pre-bending — delivering superior roundness accuracy, reduced cycle times and unmatched forming versatility for pressure vessel manufacturers, wind tower producers, shipbuilders and heavy fabrication workshops demanding zero-compromise quality.
- Rolling Width 1500 – 6000 mm
- Plate Thickness 6 – 120 mm
- One-Pass Pre-Bending
- Full CNC Control System
Premium Series
15+
Years Experience
80+
Countries Served
3000+
Machines Delivered
CE&ISO
Certified Quality
Product Overview
One-Pass Pre-Bending. Superior Roundness. Maximum Efficiency.
The KAVDO Hydraulic Four Roll Plate Bending Machine is built around a unique four-roller geometry — one top drive roll, one bottom pinch roll and two independently controlled side rolls. This configuration clamps the plate firmly between the top and bottom rolls before bending, enabling true one-pass pre-bending without reversing the plate — a decisive advantage over three-roll designs that dramatically reduces cycle time and improves forming consistency.
Equipped with full CNC control, servo-hydraulic positioning and automatic bending sequence programming, this machine handles everything from simple cylinders to complex multi-radius cones, ellipses and polycentric curves. The four-roll architecture is the preferred choice for ASME-coded pressure vessel fabrication, wind tower production and any application where roundness precision, production speed and operator efficiency are paramount.
- One-pass pre-bending — no need to reverse the plate, saving 30–50% cycle time
- Top roll + bottom pinch roll securely clamp the plate during forming
- Independent CNC-controlled side rolls for cylinder, cone and multi-radius bending
- Hardened alloy steel rollers with crown compensation for uniform bending
- Full CNC controller with 999 program memory and automatic bending sequences
Performance Highlights
Key Advantages
The KAVDO four roll plate bender combines precision four-roller geometry, servo-hydraulic power and intelligent CNC control — engineered for fabricators demanding the highest roundness accuracy and fastest production cycles.
One-Pass Pre-Bending
The bottom pinch roll clamps the plate against the top roll while the side rolls form each edge in a single forward pass — no plate reversal needed. This eliminates the double-handling required by three-roll machines, reducing pre-bending cycle time by 30–50% and significantly boosting daily throughput.
Superior Roundness Accuracy
The four-roll clamping geometry maintains precise plate alignment throughout the entire bending process. Combined with CNC-controlled roll positioning and real-time pressure feedback, the machine consistently achieves roundness tolerances within ±0.5 mm — meeting the strictest ASME, EN and GB code requirements for pressure vessels.
Versatile Shape Forming
Independent hydraulic control of each side roll enables asymmetric positioning for cone rolling, elliptical forming, S-curves and polycentric arcs without tooling changes. The four-roll design excels at complex shapes that require different curvatures at each end of the plate — one machine handles the full spectrum of plate forming demands.
Full CNC Automation
Integrated CNC controller with servo-hydraulic positioning, digital readout for all four rolls and programmable multi-step bending sequences. Store up to 999 bending programs and recall them instantly for repeat jobs — eliminating trial-and-error setup, reducing scrap and ensuring identical output piece after piece.
Heavy-Duty Construction
FEA-optimized welded steel frame with stress-relieved box-section construction withstands maximum rolling force without deflection. Hardened 42CrMo alloy steel rollers (HRC 55–60) with optional crown compensation deliver uniform bending across the full plate width — built for decades of heavy production service.
Reduced Operator Dependency
The pinch-roll clamping system holds the plate in position automatically — no manual alignment or repositioning needed between passes. Combined with CNC-guided bending sequences, even less experienced operators produce code-quality cylinders consistently, solving the skilled labor shortage common in fabrication shops.
Need Help Selecting the Right Four Roll Configuration?
Our engineers will analyze your plate thickness, rolling width and material grade to recommend the optimal four roll plate bender for your production requirements.
Technical Data
Specifications
Available in multiple capacity configurations to match your plate thickness and width requirements. All models feature full hydraulic drive with standard CNC control.
| Parameter | W12-6×1500 | W12-6×2000 | W12-8×1500 | W12-8×2500 | W12-10×2000 | W12-10×3000 |
|---|---|---|---|---|---|---|
| Max Rolling Thickness (mm) | 6 | 6 | 8 | 8 | 10 | 10 |
| Max Pre-rolling Thickness (mm) | 5 | 5 | 6 | 6 | 8 | 8 |
| Max Rolling Sheet Length (mm) | 1500 | 2000 | 1500 | 2500 | 2000 | 3000 |
| Top Roller Diameter (mm) | 170 | 190 | 190 | 250 | 240 | 290 |
| Lower Roller Diameter (mm) | 160 | 170 | 170 | 230 | 220 | 270 |
| Side Rollers Diameter (mm) | 140 | 150 | 150 | 180 | 200 | 220 |
| Min Rolling Diameter (mm) | 250 | 280 | 280 | 300 | 330 | 400 |
| Rolling Speed (m/min) | 4 | 4 | 4 | 4 | 4 | 4 |
| Motor Power (kW) | 4 | 5.5 | 5.5 | 7.5 | 7.5 | 7.5 |
| Oil Tank Volume (L) | 150 | 150 | 150 | 150 | 180 | 180 |
| Dimension L (mm) | 3500 | 4000 | 3500 | 4150 | 4150 | 5200 |
| Dimension W (mm) | 1350 | 1380 | 1350 | 1380 | 1500 | 1580 |
| Dimension H (mm) | 1200 | 1200 | 1250 | 1300 | 1400 | 1550 |
| Weight (kg) | 2500 | 2980 | 2700 | 3800 | 5150 | 7980 |
* Bending capacity is based on Q235 (S235JR / A36) mild steel at room temperature. Actual capacity for higher-strength materials (Q345, S355, stainless steel, etc.) is reduced proportionally. Custom configurations available upon request.
Core Components
Machine Structure
Precision-engineered with heavy-duty industrial components and four-roll geometry — delivering unmatched forming accuracy, plate clamping stability and operational efficiency.
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1
Top Roll (Drive Roll)
42CrMo alloy steel roller with induction-hardened surface (HRC 55–60), driven by servo-motor and planetary gearbox for consistent torque. Optional crown compensation corrects deflection across the full plate width.
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2
Bottom Pinch Roll
Hydraulic pinch roll clamps the plate firmly during pre-bending and rolling, ensuring zero slippage and precise edge alignment — the key advantage of the four-roll design over three-roll alternatives.
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3
Side Rolls (Left & Right)
Two independently CNC-controlled side rolls with ±0.1 mm servo precision, enabling one-pass pre-bending, cone rolling with independent tilt, and multi-radius forming.
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4
Hydraulic Servo System
High-pressure power unit with proportional servo valves and Rexroth / Parker components. Closed-loop pressure feedback ensures consistent forming force and smooth roll movement under varying loads.
Core Technology
Intelligent CNC Servo Control System
The KAVDO four roll plate bender is equipped with a state-of-the-art CNC servo-hydraulic control system that transforms complex plate forming into a precise, repeatable and highly automated process. Unlike manual or PLC-only machines, the full CNC system calculates optimal roll positions in real time based on plate thickness, material grade and target diameter.
Operators simply input the desired parameters — plate thickness, width, material type and target radius — and the CNC automatically generates the complete multi-step bending sequence including pre-bending angles, progressive roll positions and final calibration passes. The servo-hydraulic positioning system delivers ±0.1 mm accuracy on all four rolls simultaneously, ensuring perfect roundness from the first piece to the thousandth.
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±0.1mmServo Position Accuracy
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999+Stored Programs
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50%Faster Cycle Time
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4-AxisSimultaneous Control
How It Works
4-Step Plate Rolling Workflow
From flat plate to finished cylinder — the four-roll design simplifies the process with automatic clamping, one-pass pre-bending and CNC-guided continuous rolling.
1
Clamp & Align
Feed the steel plate between the top roll and bottom pinch roll. The hydraulic pinch roll rises to clamp the plate firmly in position. The plate is automatically centered and aligned — no manual adjustment needed. The CNC loads the pre-programmed bending sequence.
2
One-Pass Pre-Bend
With the plate securely clamped, one side roll rises to pre-bend the leading edge. The top roll then rotates forward to advance the plate, and the opposite side roll pre-bends the trailing edge — all in a single forward pass without reversing the plate.
3
CNC Continuous Rolling
Both side rolls move to the CNC-calculated bending position and continuous rolling begins. The servo system progressively adjusts roll positions pass by pass until the target diameter is achieved. Real-time feedback ensures uniform curvature across the full plate width.
4
Unload & Verify
Open the drop-end bearing housing and slide the finished cylinder off the top roll. Verify the diameter with laser gauge or tape. The CNC automatically stores the proven parameters for instant recall on repeat production runs.
Rolling Capabilities
Materials & Forming Samples
From thin sheet metal to ultra-heavy structural plate, from perfect cylinders to complex polycentric cones — see the versatility and superior forming quality achievable with the KAVDO four roll plate bender.
Carbon Steel Plate
Q235, Q345, A36, S355 and high-strength structural steel up to 120 mm thickness with full one-pass pre-bending capability.
Stainless Steel
304, 316L, 321 and duplex stainless steel with protective film rolling to prevent surface scratching for food-grade and chemical vessels.
Aluminum Alloy
5052, 5083, 6061 aluminum alloy plate for tank trucks, LNG vessels, marine applications and lightweight structural components.
Wind Tower Sections
Large-diameter tapered tower sections for onshore and offshore wind turbines with tight roundness and taper angle tolerances.
Applications
Industries We Serve
From ASME-coded pressure vessel fabrication to offshore wind tower production, from nuclear containment to heavy shipbuilding — the KAVDO four roll plate bender delivers the precision and throughput demanded by the world’s most critical forming applications.
Buyer’s Guide
Four Roll vs. Three Roll Plate Bender
Understand the key differences to select the optimal plate rolling machine for your production requirements, precision demands and budget considerations.
Recommended for Precision
KAVDO Four Roll Plate Bender
Premium choice for high-precision, high-volume production
- One-pass pre-bending — plate never needs to be reversed, saving 30–50% cycle time
- Pinch roll clamping grips plate firmly — zero slippage or misalignment
- Superior roundness accuracy (±0.5 mm) for ASME/EN-coded vessels
- Independent 4-axis CNC control for maximum shape flexibility
- Reduced operator dependency — CNC guides the entire bending sequence
- Ideal for thick plate, complex cones and critical-tolerance applications
Three Roll Plate Bender
Cost-effective for standard production forming
- Lower initial investment — 30–40% less than equivalent four roll machines
- Simpler structure with fewer components — lower maintenance costs
- Built-in pre-bending capability (requires plate reversal)
- Excellent for standard cylinders and moderate-precision work
- Smaller footprint — saves workshop floor space
- Faster learning curve for operators with basic forming needs
Why KAVDO
Your Trusted Manufacturing Partner
Beyond machines — we deliver complete plate forming solutions including pre-sales engineering consultation, installation commissioning, operator training and lifelong after-sales support.
Factory Direct Price
Buy directly from our own factory — no middlemen. Competitive pricing with transparent quotation and no hidden costs. Bulk order discounts available.
Engineering Support
Dedicated project engineer reviews your drawings, recommends the optimal machine configuration and provides forming process guidance from quotation through production ramp-up.
Global Shipping
Professional heavy equipment export packing with anti-rust treatment, fumigation certificate and transport insurance. Full container or break-bulk shipping worldwide.
Lifetime Support
Remote video troubleshooting, spare parts supply within 48 hours, on-site installation commissioning and optional annual maintenance service contract for the life of the machine.
Get Started
Start Your Project with KAVDO Today
Get professional advice and competitive pricing within 24 hours. Tell us about your requirements and our team will prepare a tailored solution for you.
- Response within 24 hours
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- Serving 80+ countries worldwide
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