Automatic Steel Coil Slitting and Recoiling Production Line

Automatic Steel Coil Slitting and Recoiling Production Line：

Overview & Advanced Coil Processing Technology

The XINNUO High-Precision Automatic Steel Coil Slitting and Recoiling Production Line represents an elite industrial sheet metal processing solution engineered for rapid, burr-free longitudinal slitting of master coils into multiple narrow strips of precise widths. Designed to meet the stringent demands of modern steel service centers, automotive stamping facilities, cold roll forming factories, and metal packaging producers, this integrated production line accommodates a broad spectrum of metallic materials including cold-rolled carbon steel, hot-dip galvanized steel, pre-painted galvanized iron (PPGI/PPGL), silicon electrical steel, stainless steel, and high-tensile aluminum alloys. Built upon heavy-duty fabrication principles and micro-metric machining accuracy, Hebei Xinnuo delivers turn-key slitting installations that maintain exceptional edge straightness, minimal strip camber, zero surface scratching on delicate coatings, and uninterrupted high-speed throughput.

Modular Line Configuration & Core Subsystems

The standard XINNUO continuous slitting line incorporates a cohesive sequence of synchronized automated equipment:

1. Entry Coil Loading & Heavy-Duty Decoiler: Featuring an electromechanical or hydraulic expanding mandrel with motorized drive and pneumatic brake control, ensuring stable unwind tension from mother coils weighing up to 10 tons.
2. Pinch Roller & Precision Leveling Station: Flattens coil curvature and relieves internal residual stresses prior to entry into the rotary cutter, ensuring flawless strip flatness across multi-blade passes.
3. High-Rigidity Rotary Slitting Machine: Outfitted with dual high-strength alloy arbor shafts, precision spacers, and circular rotary shear blades that execute clean, simultaneous multi-strip longitudinal slicing.
4. Dual Edge Scrap Winders (Trim Recoilers): Continuously wind cut edge margins into tight, manageable coils for rapid scrap disposal and clean shop-floor housekeeping.
5. Hydraulic Crop Shear: Delivers instantaneous flat cross-cutting to trim off uneven coil heads and tails or perform batch-end cut-to-length severance.
6. Tension Pad Station & Separator Disc Assembly: Provides individually adjustable pneumatic or hydraulic back-tension, ensuring all slit strips rewind with uniform, tightly packed density regardless of coil thickness variances.
7. Hydraulic Rewinding Recoiler with Pusher: Equipped with an expandable segmented drum, over-arm separator, and hydraulic push-off plate for safe, automated unloading of finished slit coils.

Precision Slitter Head & Rotary Tooling Mechanics

The heart of the slitting system is the heavy-duty slitter head assembly. Fabricated from thick cast-iron archway stands and annealed steel housings, the frame completely eliminates shaft flexure under maximum shearing resistance. The upper and lower slitter arbors (diameter Φ120 mm to Φ180 mm) are forged from 42CrMo high-grade alloy steel, precision ground and dynamically balanced to maintain radial and axial runout tolerances within ≤0.005 mm≤0.005 mm. Rotary slitting blades are manufactured from vacuum-hardened high-vanadium alloy tool steels (Cr12MoV, D2, or High-Speed Steel HSS) with a certified hardness of HRC 60–63. Micrometric handwheel and worm-gear adjustment mechanisms allow operators to fine-tune blade overlap and horizontal clearance with sub-millimeter sensitivity, guaranteeing knife-edge precision and eliminating burrs across the entire coil width.

Intelligent PLC Synchronization & Constant-Tension Control

Automation is coordinated via an industrial-grade Siemens or Mitsubishi PLC platform linked to an ergonomic, swivel-arm color touch-screen HMI console. The system features advanced closed-loop vector variable-frequency drives (VFD) or digital DC drive motors that dynamically synchronize line speeds across the uncoiler, slitter arbors, loop buffer, and recoiler drum. Integrated line-speed detection and digital rotary encoders provide automatic acceleration, constant linear velocity tracking, automated deceleration at target batch counts, and precise coil-length measurement. Real-time diagnostic monitors, pneumatic interlocks, anti-collision sensors, and multiple emergency stop stations ensure fail-safe operation and compliance with CE and ISO international safety directives.