HR Steel Coil Slitting Line

Shijiazhuang Faith Machinery Co.,Ltd offers Hot-Rolled (HR) Steel Coil Slitting Lines that combine structural strength with precision control, tailored for service centers and OEMs processing heavy gauge strip up to 12 mm thick. These lines convert wide hot-rolled coils into slit coils ready for stamping, forming, or heavy fabrication.

1. Robust Coil Preparation
Hydraulic coil cars handle hot-rolled coils weighing up to 40 tons, positioning them onto mandrel decoilers with automatic expansion arms. Decoiler brakes are sized to manage the higher strip mass, ensuring controlled uncoiling. Entry pinch rolls transfer strip into a hydraulic leveler equipped with variable crown control to address camber and edge wave inherent in hot-rolled coil.

2. Heavy-Duty Slitting Module
Given the strip thicknesses involved, the slitting section employs oversized knife shafts supported by high‐capacity bearings. Upper and lower knives are ground from tool steel with optimized tooth geometry for shearing thick material. Pneumatic quick-change holders and hydraulic actuators allow knife spacing adjustments under PLC guidance, achieving slit widths from 20 mm to 1,200 mm with ±0.2 mm accuracy.

3. Tension Control and Surface Care
Load cells mounted on entry and exit guide stands provide real-time tension feedback, enabling the PLC to adjust decoiler and recoiler drive torques. Guide rollers use heat‐resistant polyurethane coatings to protect the strip surface during high‐temperature processing, preventing strip mar and maintaining edge finish.

4. Scrap Handling and Efficiency
Edge trim conveyors and screw-driven scrap choppers manage thick steel waste effectively, conveying offcuts to a centralized collection point. The system’s high‐torque choppers handle trim widths up to 20 mm, cutting scrap quickly to reduce pile-up and support uninterrupted line operation.

5. Recoiling and Coil Build
Disc-type recoilers with dynamic braking maintain consistent rewind tension across varying slit widths. Laser‐based edge tracking systems adjust coil traverse rates to prevent telescoping, producing evenly wound slit coils suitable for storage and downstream processing. Speeds reach up to 80 m/min for heavy gauge applications.

6. Control Systems and Diagnostics
A Rockwell Automation PLC network integrates all drive axes and sensors, with an HMI that presents slitting patterns, tension curves, and maintenance counters. Built‐in diagnostics identify worn knives or bearing anomalies before quality is affected. Data archiving supports quality audits and continuous improvement initiatives.