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Hot rolled strip slitting lines are essential for processing wide, heavy gauge material into narrow coils that serve steel service centers, construction component manufacturers, and heavy machinery producers. Shijiazhuang Faith Machinery Co.,Ltd delivers hot rolled slitting solutions engineered for high throughput, robust construction, and precise tension control. This article discusses line architecture, critical control features, material handling, and life‑cycle support.
Coil Car and Decoiler
Hydraulic coil cars with load capacities up to 50 tons position coils automatically.
Mandrel‑expansion decoilers accommodate inner diameters from 508 mm to 610 mm.
Leveling Section
Multi‑bar leveler stands featuring hydraulic crown control ensure strip flatness and correct camber defects inherent in hot rolled material.
Slitting Module
Rotating shear slitting knives mounted on radial bearings handle strip thicknesses from 1.2 mm to 12 mm.
Knife holders with automated spacing adjustment speed up transitions between slit widths.
Recoiler and Coil Tension System
Disc‐type recoilers maintain high tension capacity, with dynamic braking to manage recoil inertia.
Strip edge clamps and coil‑centering guides ensure concentric winding and stable coil build.
Load‑Cell Tension Feedback: Load cells integrated in the entry and exit sections feed data to the PLC, preserving uniform strip tension across varying widths.
Head‑Tail Tracking: Strip leading and trailing edge detection systems automatically adjust coil alignment and traverse speed to prevent miswinds.
VFD and Drive Synchronization: Synchronized drives on decoiler, leveler, slitter, and recoiler maintain constant line speed, reducing impact on knife wear and coil quality.
Alarm Management: The HMI logs line stoppages with error codes and recommended corrective actions, enabling rapid recovery.
Automatic Scrap Collection: Edge trim conveyors and scrap bundlers collect slit waste, segregating by width to support recycling workflows.
In‑Line Coil Transfer: Optional coil transfer tables move recoiled coils to downstream pay‑off units, automating the flow between slitting and stamping or forming processes.
Linemark Ink‑Jet Printers: Automatic marking of coil IDs, slit widths, and production dates onto coil surfaces simplifies inventory tracking.
Throughput Targets: Standard lines process up to 150 m/min for thin gauge and 50 m/min for heavy gauge—higher speeds available with dual‑frame configurations.
Strip Material Compatibility: Carbon steel, low‑alloy steel, galvanized steel (GI), and aluminized steel can be accommodated with minor adjustments to leveling roll tension and knife gap settings.
Layout Adaptation: Tailored line lengths, inline coil car positioning, and modular machine skid designs fit diverse shop floor plans.
Installation and Commissioning: Project management from civil works to line start‑up ensures alignment with production schedules.
Training Curriculum: Hands‑on operator and maintenance training programs cover mechanical adjustments, PLC troubleshooting, and routine inspections.
Spare Parts Supervision: Automated alerts for projected wear part replacement intervals help clients maintain optimal spares inventory.
Upgrades and Retrofits: As production demands evolve, Faith Machinery offers control system upgrades, additional leveler bars, and extra recoiler capacity to extend line utility.