High-Precision Leveling, Slitting & Cut-to-Length Machinery
Factory-direct metallurgical machinery configured to conquer yield strength barriers, residual stress deviations, and tight laser-cutting flatness tolerances.
High Strength Leveling Machine
Heavy-duty multi-roll leveler designed to eliminate coil set, cross bow, and internal stress in high-yield-strength plate up to Q690/Hardox.
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Professional Straightening Machine
Engineered for precision sheet blanking and automated stamping lines, delivering dead-flat geometry and isotropic stress relief.
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Hot Rolled Plate Moving Shear Line
Continuous dynamic shearing with synchronized carriage motion, allowing continuous uncoiling and leveling without strip pause.
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Stainless Steel Coil CTL Line
Surface-critical processing system with 6-Hi leveling geometry, polyurethane back-up rolls, and automated scratch-free stacking.
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Hot-Rolled Slitting & CTL Combo Line
Multifunctional metallurgical cell that uncoils, slits into multiple widths, levels, and cuts to discrete stacked lengths in one footprint.
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Hot Rolled Slitting & Recoiling Line
High-rigidity rotary slitter with rapid hydraulic tool changer, precision arbor bearings, and loop control for flawless recoil edges.
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HR Heavy-Duty Slitting Line
Engineered to produce camber-free slit coils for ERW tube mills, roll-forming lines, and structural automotive chassis fabrication.
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Heavy Plate Uncoiling & CTL Line
High-power hydraulic leveling system handling steel plate up to 25mm thickness, delivering flatness tolerances under 1mm/m².
View Machine SpecificationsThe Science of Residual Stress Elimination & Multi-Roll Leveling
Why traditional unbending is insufficient for modern high-yield fabrication. An engineering breakdown of elastoplastic alternating bending, intermeshing depths, and fiber elongation symmetry.
Elastoplastic Alternating Bending
When metal coils are unwound, internal stress gradients cause coil set, cross bow, twist, and edge waves. Jianfa leveling machines subject the strip to alternating cyclic bending over staggered work rolls. By causing the outer fibers to exceed the material's yield point (>70% to 80% plastic strain in the initial rolls), all material fibers are forced into equal length, permanently dissipating locked-in stresses.
4-Hi vs. 6-Hi Roll Architecture
Standard 4-Hi levelers utilize upper and lower work rolls supported by back-up roller bearings, ideal for heavy-gauge hot-rolled steel and construction plate. For mirror-finished stainless steel, aluminum, and cold-rolled automotive sheets, Jianfa supplies 6-Hi configurations with intermediate rolls. These intermediate rows prevent backup roll striping and allow dynamic roll-bending to conquer center buckles.
Preventing Springback in Laser Cutting
In modern CNC fiber laser cutting, residual sheet stress causes cut components to tip upward or twist, colliding with expensive cutting heads and halting lights-out production. Jianfa precision levelers neutralize isotropic tension across both surface fibers and core axes, guaranteeing that downstream thermal cutting, punch-press blanking, and robotic welding execute without thermal distortion.
| Leveler Configuration | Roll Quantity | Applicable Thickness | Target Flatness | Key Industry Applications |
|---|---|---|---|---|
| Heavy Plate 4-Hi Leveler | 9 to 13 Rolls (Cassette) | 6.0 mm – 25.0 mm | ≤ 1.0 mm / m² | Shipbuilding, Heavy Crane Chassis, Bridge Girders, Armored Steel |
| Medium Gauge Precision Leveler | 15 to 19 Rolls | 1.5 mm – 8.0 mm | ≤ 0.5 mm / m² | Automotive Stamping, Agricultural Equipment, High-Speed Railway Panels |
| High-Precision 6-Hi Leveler | 19 to 23 Rolls + Intermediate | 0.3 mm – 3.0 mm | ≤ 0.2 mm / m² | Stainless Appliances, EV Battery Enclosures, Aerospace Skin Sheets |
| Ultra-Thin Foil Straightener | 21 to 27 Micro-Rolls | 0.1 mm – 1.0 mm | Zero Curvature | Transformer Silicon Core, Medical Foil, Precision Electronics Shielding |
Meeting Macro-Industry Demands Across Global Sectors
Worldwide procurement officers balance yield efficiency, changeover speed, and structural longevity. Here is how Jianfa coil lines solve critical bottlenecks in major industrial verticals.
Automotive & EV Lightweighting
Processing Advanced High-Strength Steels (AHSS) such as DP980 and CP1180 requires massive roll separating force and anti-deflection structures. Jianfa levelers utilize ultra-stiff cast machine frames and hydraulic servo gap adjustments to control high springback, ensuring critical crash-structure stampings meet micron-level tolerances.
AHSS & Aluminum 6000 SeriesSteel Service Centers & Toll Processing
Steel distributors handle constantly shifting coil chemistries, widths, and surface finishes. Jianfa quick-change cassette systems allow operators to swap complete roll assemblies in under 15 minutes, switching smoothly from 12mm structural carbon steel to 1.2mm BA stainless steel without surface contamination.
15-Minute Cassette Quick-ChangeHeavy Construction & Mining Machinery
Leveling wear-resistant plates (e.g., Hardox 450/500) demands extraordinary torque and back-up roll endurance. Our high-torque split transmission gearboxes and individually driven cardan shafts deliver unyielding tractive pull without roll slippage or premature tooth degradation under severe shock loading.
High-Torque Hardox LevelingElectrical Steel & Transformer Cores
Grain-oriented silicon steel requires zero edge stress to prevent degradation of magnetic permeability and core watt-loss. Jianfa incorporates non-marking chrome-plated work rolls, precision loop control, and low-tension strip decambering to preserve magnetic domain integrity.
Zero Permeability LossComparing Continuous Slitting, Traditional CTL, & Flying Shear Lines
Selecting the optimal metallurgical configuration requires balancing line velocity, cutting mechanics, and stack logistics. Review our comparative engineering assessment.
Continuous Coil Slitting Line
Engineered to divide master mother coils into multiple tight-tolerance narrow strips. Features high-rigidity arbors, hydraulic push-off plates, dynamic loop pit dampening, and automated strip tensioners for tube mill feeding and stamping die coils.
- Speeds up to 200 m/min with quick knife setup
- Minimal slit burr (≤ 3% of sheet thickness)
- Ideal for pipe mills, stamping blanks, transformer strips
Start-Stop Cut to Length (CTL)
The standard for custom sheet processors. Features an NC feeder and stationary mechanical or hydraulic guillotine shear. The strip pauses precisely as the high-tonnage shear blade descends, achieving length accuracy within ±0.2 mm.
- Heavy plate capacity up to 25 mm thickness
- High flexibility for varied custom sheet lengths
- Direct integration with automated drop stackers
Synchronized Flying Shear Line
The pinnacle of high-volume plate and sheet conversion. The shear assembly accelerates along precision linear guides to match moving strip speed perfectly, cutting on-the-fly without pausing coil feed, tripling continuous throughput.
- No roll slippage or surface marking during cutting
- Cuts up to 80-120 parts per minute
- Designed for high-output steel mills and toll processors
Technology Roadmap: AI-Driven Closed-Loop Smart Leveling
How Jianfa integrates machine vision, industrial IoT, and automatic roll-bending algorithms to evolve from reactive operator adjustment to autonomous closed-loop sheet leveling.
In-Line Laser Flatness Scanning
Multi-point high-speed laser line triangulation sensors continuously scan the sheet topography immediately upon exiting the leveler rolls, detecting center buckles or wavy edges in real time with 0.01 mm resolution.
Closed-Loop Servo Back-Up Adjustment
Feedback data from the laser scanner is transmitted via high-speed EtherCAT to the hydraulic roll-bending servos. The system autonomously adjusts individual back-up roll wedge jacks to counterbalance localized strip fullness without human intervention.
Material Property Database Presets
The CNC terminal stores mechanical property profiles for thousands of steel and alloy coil specifications. Operators simply input coil thickness, width, and yield point, and the system automatically pre-sets work roll plunge depth and entry-exit wedge ratios.
Predictive Bearing & Roll Wear Analytics
Embedded vibration transducers and thermal sensors on all heavy work roll journals detect micro-pitting in needle bearings and roll deflection fatigue well in advance, preventing unplanned downtime during multi-shift operations.
40+ Years of Manufacturing Integrity & Global Compliance
Wuxi Jianfa Machine-Building Co., Ltd. operates a 40,000 m² state-of-the-art facility in Wuxi, Jiangsu. A designated National Key Developing Enterprise in the metallurgical machinery sector.
Verified International Quality Standards & Enterprise Honors
Global Operational Footprint Across 30+ Nations
Jianfa lines operate across all provinces of mainland China and in key international markets: United States, Mexico, Guatemala, Peru, Brazil, Argentina, Greece, Albania, Bulgaria, Türkiye, Russia, Kazakhstan, Kyrgyzstan, Egypt, Libya, Jordan, Iran, United Arab Emirates, Ethiopia, Nigeria, South Africa, India, Myanmar, Vietnam, Malaysia, Indonesia, and Australia.
Turnkey Coil Processing Lines Ready for Custom Engineering
Every machine is fully tested under continuous factory running simulation prior to sea-freight packing. Explore our proven equipment portfolio below.
CE Certified Cut to Length Line
European compliance certified cut-to-length processing line with full safety interlocks, optical light curtains, and precision shearing.
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Professional Flying Shear Line
Advanced high-speed flying shear line designed for uninterrupted high-volume uncoiling, leveling, and on-the-fly shearing.
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High-Accuracy Coil Slitting Line
Heavy-rigidity rotary slitter engineered for high-tensile strip slitting with minimal burr, integrated scrap rewinders, and tight recoiling.
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High Strength Steel Leveling Unit
Multi-roll high-torque leveling unit specifically engineered to integrate into existing coil processing, blanking, or roll-forming lines.
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Hot Rolled Moving Shear Station
Servo-driven traveling guillotine cutting carriage delivering clean, square-cut plate ends without stop marks or feed-roll scuffing.
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Precision Stainless Shearing System
Custom engineered for 2B, BA, No.4, and hairline finish stainless steel sheets with automated paper interleaving and film lamination.
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Integrated Slit & Cut-to-Length Cell
Space-saving hybrid line allowing operators to selectively slit coils into strips, cut them into sheets, or execute simultaneous dual processing.
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Automated Precision Straightener
High-speed CNC leveler equipped with individual servo gap adjustment, digital readouts, and automated memory presets for stamping dies.
Request Technical DossierEngineering Guides & Field Commissioning Insights
Authored by Jianfa senior field commissioning engineers to help operators minimize startup downtime, extend knife lifespan, and master CNC leveler parameters.
What Commissioning Work Is Required Before Putting a New Slitting Line into Production?
A newly installed slitting line must never jump directly into heavy-gauge coil cutting. This guide covers mandatory hydrostatic oil tests, arbor parallel runout verification (<0.005mm), scrap chopper synchronization, and progressive trial slitting.
Download Checklist →Is It Difficult to Learn the Operation of a CNC Leveling Machine?
Demystifying the learning curve of computerized sheet metal leveling. With Jianfa's automated recipe presets, laser measuring assists, and touch-screen gap calibration, novice technicians typically achieve full operational independence within 3 to 5 days.
Read Training Guide →Advantages of Fully Automatic Slitting Lines Over Semi-Automatic Equipment
A direct cost-benefit analysis of automated knife positioning, hydraulic quick-change head assemblies, and automated turnstile recoiling versus manual shimming and mechanical clamps. Calculate your payback period across scrap reduction and shift throughput.
View ROI Analysis →Frequently Asked Engineering & Procurement Questions
Direct, authoritative answers addressing coil specifications, metallurgical deformation dynamics, overseas commissioning, and equipment guarantees.