As a leading manufacturer of heavy-duty plate bending equipment, LISTEN CNC delivers exceptional precision with our hydraulic four-roller rolling machine. Engineered with an advanced 4-roller synchronization system and full CNC control, our four roller bending machine executes complex bends while achieving zero straight edges—eliminating material waste and secondary processing. The proprietary hydraulic system ensures uniform pressure distribution and enhanced operational efficiency across every bend. CE and ISO certified with energy-saving design, this four roller rolling machine is specifically built to handle thick plates in demanding shipbuilding, pipeline construction, and structural steel applications. We integrate robust automation with industrial durability, significantly minimizing manual intervention and maximizing your workshop's productivity.
| Model | Roll width(mm) | Roll thickness(mm) | Upper roller diameter(mm) | Lower roller diameter(mm) | Side roller diameter(mm) | Power(kw) | Dimensions(mm) |
| W12-6x3000 | 3000 | 6 | 220 | 200 | 160 | 7.5 | 5500x1500x1400 |
| W12-8x2500 | 2500 | 8 | 220 | 200 | 160 | 7.5 | 5000x1500x1400 |
| W12-8x3000 | 3000 | 8 | 250 | 230 | 180 | 11 | 5600x1500x1400 |
| W12-12x2000 | 2000 | 12 | 220 | 220 | 160 | 7.5 | 4500x1500x1400 |
| W12-12x2500 | 2500 | 12 | 250 | 230 | 180 | 11 | 5100x1500x1400 |
| W12-12x3000 | 3000 | 12 | 280 | 260 | 220 | 15 | 5700x1950x1900 |
| W12-16x2000 | 2000 | 16 | 260 | 240 | 200 | 11 | 4100x1700x1800 |
| W12-16x2500 | 2500 | 16 | 280 | 260 | 220 | 15 | 5100x1950x1900 |
| W12-16x3000 | 3000 | 16 | 330 | 310 | 250 | 22 | 2900x2000x2000 |
| W12-20x2500 | 2500 | 20 | 330 | 310 | 250 | 22 | 5300x2000x2000 |
| W12-20x3000 | 3000 | 20 | 360 | 330 | 270 | 30 | 6100x2150x2000 |
| W12-25x2500 | 2500 | 25 | 360 | 330 | 270 | 30 | 5600x2100x2000 |
| W12-25x3000 | 3000 | 25 | 390 | 360 | 290 | 37 | 6100x2250x2100 |
| W12-30x2000 | 2000 | 30 | 360 | 330 | 270 | 30 | 5100x2100x2000 |
| W12-30x2500 | 2500 | 30 | 390 | 360 | 290 | 37 | 5600x2250x2100 |
| W12-30x3000 | 3000 | 30 | 410 | 380 | 320 | 45 | 6300x2500x2400 |
| W12-35x3000 | 3000 | 35 | 470 | 440 | 380 | 45 | 6600x2550x2700 |
| W12-40x2500 | 2500 | 40 | 470 | 440 | 380 | 45 | 6100x2550x2700 |
| W12-40x3000 | 3000 | 40 | 510 | 480 | 410 | 55 | 6600x2600x2750 |
| W12-50x2500 | 2500 | 50 | 510 | 480 | 410 | 55 | 6100x3100x2700 |
| W12-50x3000 | 3000 | 50 | 560 | 530 | 450 | 66 | 6600x3200x3000 |
| W12-60x2500 | 2500 | 60 | 560 | 530 | 450 | 75 | 6500x3200x3000 |
| W12-60x3000 | 3000 | 60 | 650 | 620 | 520 | 75 | 7000x3300x3400 |
| W12-70x3000 | 3000 | 70 | 700 | 670 | 550 | 90 | 7200x3500x3600 |
Choosing the right bending technology is critical for workshop efficiency. While 3-roll machines are versatile, the hydraulic 4-roll rolling machine offers significant advantages in automation and precision, especially for heavy-duty industrial applications.
| Key Technical Features | 3-Roll Bending Machine | 4-Roll Bending Machine (LISTEN CNC) |
| Pre-bending Process | Requires manual plate flipping, leading to longer cycle times. | Automatic double-sided pre-bending without removing the plate. |
| Flat End (Straight Edge) | Leaves a significant straight edge (typically 1.5–2.5x plate thickness). | Zero Straight Edge technology; minimizes material waste. |
| Production Efficiency | Moderate; requires multiple passes and manual adjustment. | High (One-pass forming); up to 50% faster than 3-roll systems. |
| Bending Accuracy | Dependent on operator skill and manual measurement. | Full CNC Synchronization with ±0.1mm positioning accuracy. |
| Material Handling | Plate can slip during the pre-bending stage. | Secure Clamping between top and bottom rollers prevents slipping. |
| Best Applications | Small workshops, simple cylinders, light-gauge metal. | Shipbuilding, Wind Towers, Pressure Vessels, and Thick Plates. |
Why Upgrade to a 4-Roll Rolling Machine?
Elimination of Secondary Processing: Because the 4-roller system can pre-bend both ends of the plate in one setup, you eliminate the need for secondary grinding or cutting of "flat ends," significantly reducing labor costs.
Superior Safety: The plate is held firmly by the bottom roller during the entire process, preventing the "tilting" or sliding issues common in 3-roll machines, making it safer for handling large-format heavy plates.
Complex Geometry Support: With full CNC control systems, our 4-roll machines can easily execute complex shapes, including ovals, squares, and multi-radius curves, which are difficult to achieve on standard rolling equipment.
Q1: How does a 4-roller rolling machine eliminate straight edges?
A: Unlike 3-roll machines, a 4-roll system clamps the plate firmly between the top and bottom rollers. This allows the side rollers to move upward and perform precise pre-bending on the very edge of the plate. By eliminating the need to flip the plate manually, it reduces the "flat end" to nearly zero, significantly saving material and secondary processing time.
Q2: What is the maximum plate thickness a LISTEN 4-roll machine can handle?
A: Our W12 series is engineered for heavy-duty industrial use. Depending on the model and material yield strength, our machines can process plate thicknesses ranging from 6mm up to 70mm, with roller widths extending to 3000mm. For customized requirements beyond these specs, our engineering team provides tailored hydraulic solutions.
Q3: Can the CNC 4-roller rolling machine create non-circular shapes?
A: Yes. Equipped with high-end CNC systems like ESA or Delem, our 4-roller machines support multi-axis synchronization. This enables the precise fabrication of complex geometries, including ovals, squares, and polycentric shapes (R-values), which are often impossible or highly inefficient to produce on manual rolling equipment.
Q4: Is specialized operator training required for these CNC machines?
A: While the technology is advanced, our HMI touchscreen interface is designed for intuitive operation. The system includes a built-in bending library where operators can input material parameters to generate automatic bending sequences. We also provide comprehensive technical support and remote diagnostics to ensure your team is proficient within days.
Heading: Advanced CNC Control & Precision Synchronization
The "brain" of our 4-roller rolling machine is powered by industry-leading CNC control systems, such as ESA (Italy) or Delem (Netherlands). Unlike manual machines, our control interface allows for automated R-value calculation and multi-stage bending sequences, ensuring high repeatability for complex elliptical and polycentric shapes.
Key Advantage: The system features real-time synchronization monitoring, which automatically adjusts the side rollers to maintain a ±0.1mm positioning accuracy.
User Benefit: Reduces the need for highly skilled operators, as the CNC library stores hundreds of bending programs, minimizing setup time and material scrap.
Heading: Industrial-Grade Electrical Architecture & Safety
We prioritize operational uptime by integrating world-class electrical components, primarily from Schneider (France) and Siemens (Germany). The electrical cabinet is designed for demanding industrial environments, featuring an independent cooling system and rigorous EMI shielding to prevent signal interference during high-speed production.
Key Advantage: Equipped with advanced voltage fluctuation protection and phase-sequence monitoring, our electrical system prevents motor damage caused by unstable power grids—a common issue in heavy-duty workshops.
User Benefit: All wiring is CE-compliant and color-coded for rapid troubleshooting, ensuring long-term reliability and 24/7 continuous operation.
Heading: High-Pressure Hydraulic Power & Leak-Proof Design
The muscle of the hydraulic four-roller rolling machine lies in its precision-engineered fluid power system. We utilize Bosch Rexroth (Germany) valve blocks and high-torque hydraulic motors to deliver consistent, uniform pressure across the entire width of the plate, which is critical for achieving "zero straight edges."
Key Advantage: Our proprietary hydraulic circuit includes a constant-pressure feedback loop and heavy-duty chrome-plated cylinders with premium Parker seals. This prevents internal pressure drops and ensures a 100% leak-proof performance even under maximum load.
User Benefit: Provides smooth, vibration-free roller movement, which directly translates to a superior surface finish on the rolled plates and reduced maintenance costs.
It regulates oil flow, pressure, and direction to synchronize roller movements. Equipped with solenoid and pressure relief valves, it ensures precise force distribution and overload protection. CE/ISO-certified, the block optimizes rolling accuracy and safety in heavy-duty applications like shipbuilding and structural steel fabrication.
Combines hydraulic pumps, motors, and valve blocks to drive synchronized roller movements. High-torque motors power axial piston pumps, generating adjustable hydraulic pressure. Precision valve control ensures stable force distribution for uniform bending. Energy-efficient, CE/ISO-certified, and built for heavy-duty use in shipbuilding, pipelines, and structural steel industries.
Engineered for precision and durability, the rollers of our 4 roller rolling machine are crafted from high-strength alloy steel and undergo professional hardening and chrome-plating processes to deliver exceptional wear resistance. Hydraulic synchronization across all four rollers ensures precise bending force distribution and accurate curvature control, while the adjustable roller spacing accommodates varied material thicknesses—from steel and aluminum to other industrial metals. CE and ISO certified, this four roller rolling machine is built to deliver long-term durability, operational efficiency, and workplace safety, making it the trusted choice for demanding applications in shipbuilding, pipeline construction, and heavy metal fabrication.
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