Automated Steel Wire Rewinding and Binding Line: Rewind Time, Binding Wire and AGV Layout

Executive summary

An automated steel wire rewinding and binding line takes a coil from the drawing area, rewinds the wire into a heavier, tidier coil and ties it with steel wire through the coil eye. Automated guided vehicles carry the coils between stations, so nobody lifts or pushes a coil by hand. Our equivalent solution pairs our steel wire winding machine (360 m/min, φ2–φ4 mm wire, 50–1,000 kg coils) with a wire-twist binding unit. Below we size the rewinding time, the binding wire per coil and the AGV layout.

A low-profile round AGV platform transfers the heavy steel wire coil between processing cells and docks precisely beneath the gantry frame. Overhead positioning arms lower over the coil core while wire stock feeds through precision guides and tensioning rollers directly into the binding head for automated shaping and cutting. An integrated industrial control console with HMI touchscreen and emergency stop oversees the station sequence, interlocking line start strictly with confirmed AGV docking position.

Table of Contents

Why rewind and bind automatically

Wire from drawing machines typically discharges in smaller coils containing multiple joint welds. Downstream processing plants require fewer, heavier, continuous coils because each wire joint creates an interruption or downtime stop on high-speed forming lines. Rewinding consolidates drawn wire into a single dense coil, while automated binding secures its mechanical geometry during heavy crane lifting and intermodal transit.

Both operations are labor-intensive, hazardous, and situated near moving wire running under high tension, making them the primary targets for mill automation. Within our integrated manufacturing framework, coiling and packaging are built as a unified line family (differentiating integrated winder-binding systems from standalone secondary packaging equipment [manufacturer rating]).

Line flow, station by station

The continuous automation sequence operates across five sequential stations:

  1. Supply: The AGV conveys the raw source coil from the drawing zone to the dedicated pay-off station and docks beneath the overhead gantry.
  2. Rewinding: The wire feeds through linear guide dies and tensioning rollers onto the expanding reel. The coiling head adjusts vertically to locate wire ends, while servo-driven profiling ensures tight, level layer winding under constant back-tension [manufacturer rating].
  3. Shifting: An automated mechanical clamp securely grips the dense, finished coil, transferring it directly from the doffing rack to the binding position.
  4. Binding: Binding wire is driven through the open coil eye, formed around the annular coil cross-section, tensioned, and twisted closed.
  5. Stacking: An automated overhead crane or transfer arm collects the secured coil for transport to the finished inventory storage bay.

The central PLC system interlocks every station: each sequence step commences only when the preceding station returns a positive cycle-complete handshake.

Rewinding: speed and coil weight

The rewinding system utilizes an elephant-trunk vertical winder with the core reel positioned eye-to-sky. The trunk connecting plate routes continuous wire directly down to a vertical doffing rack, allowing substantial coil mass accumulation without creating intermediate wire joints.

Parameter Value
Winding reel diameter φ560 mm
Winding speed 360 m/min
Wire diameter φ2–φ4 mm
Finished coil weight 50–1,000 kg
Binding material steel wire, PET or PP, by coil weight

Heavier coils utilize steel wire ties through the eye for maximum tensile containment; lighter wire bundles can be processed with high-strength PET or PP strapping.

Rewinding time per coil

Wire cross-sectional mass per linear metre is determined by steel density: Mass per metre: 7,850 kg/m³ × π × (wire diameter ÷ 2)² Rewinding cycle time is calculated by: Rewinding time: Coil weight ÷ Mass per metre ÷ Winding speed

(Calculations below represent illustrative engineering reference models):

Wire Diameter Mass per Metre Total Length in 1,000 kg Coil Rewinding Time at 360 m/min
φ4 mm ≈ 0.0987 kg/m ≈ 10,100 m ≈ 28 min
φ2 mm ≈ 0.0247 kg/m ≈ 40,500 m ≈ 112 min

Because mass scales quadratically with diameter, thin wire (φ2 mm) requires four times the rewinding duration of φ4 mm wire for an identical 1,000 kg bundle. In contrast, the automated wire binding cycle operates at a fixed mechanical speed regardless of wire gauge. Consequently, on thinner wire lines, a single through-the-eye binding station easily services multiple upstream winders without causing line bottlenecks.

Binding through the eye with steel wire

The through-the-eye binding unit integrates two synchronized mechanisms: a wire feed track and a rotating twisting head. The feeding track extends through the open eye of the vertical coil, encircling the coil wall cross-section before returning the wire end to the twisting head. The mechanism grips both wire leads, pulls radial tension, twists the wire knot to a specified turn count, and shears the tail cleanly.

Two system layouts support dual radial strapping (two ties per coil):

  • Dual twisting heads: Two binding heads cycle simultaneously, completing two ties in a single fast stroke to match high-volume output.
  • Single twisting head with indexing turntable: The head applies the first tie, an integrated turntable rotates the coil (e.g., 90° or 180°), and the unit applies the second tie. This configuration lowers capital investment while fitting lines with longer rewinding cycles.

Binding with standard wire stock eliminates specialized consumable strap costs, as compatible steel wire inventory is already produced and maintained on-site.

Binding wire per coil

The wire loop length required per tie depends on the coil’s physical annular envelope: Loop length: 2 × (Radial width + Coil height) + Twist allowance where: Radial width: (Coil OD − Coil ID) ÷ 2

The coil internal diameter (ID) corresponds to the φ560 mm expanding mandrel. For a package with 900 mm outer diameter (OD), 400 mm package height, and an engineered 100 mm knot twist allowance (illustrative example):

Engineering Parameter Calculation Result
Radial width (900 − 560) ÷ 2 170 mm
Loop length (single tie) 2 × (170 + 400) + 100 1,240 mm
Two ties per coil 2 × 1,240 2,480 mm

Target strap counts, twist node allowances, and overall machine binding cycle times are confirmed during initial project sizing. AGV payload ratings and floor-level docking alignments are finalized during layout engineering.

AGV transport and docking

Automated guided vehicles eliminate erratic forklift handling and high-maintenance crane transfers between wire drawing, rewinding, and packing sectors. Each heavy-load AGV supports a dedicated steel coil centered on a low-profile round deck, following magnetic floor tracks, optical paths, or laser guidance.

Precision docking repeatability is critical: the vehicle must align centrally beneath the gantry frame to ensure overhead pay-off clamps and stabilizing mandrels enter the coil eye without mechanical scuffing. Station safety interlocks restrict gantry arm lowering until optical proximity and laser docking sensors verify full zero-speed station lock. The required fleet size depends directly on plant travel distance, speed profiles, and winder cycle duration, verified during site engineering.

Selection checklist

To size the rewinding winder, binding head, and AGV fleet, verify the following inputs:

  1. Drawn wire diameter range, tensile strength, and steel grade.
  2. Source coil dimensions, inner/outer diameters, and incoming bundle weight.
  3. Target rewound coil weight (50–1,000 kg), final OD, and stack height.
  4. Binding specification: steel wire gauge, number of radial ties (2 or 4), or alternative PET strapping.
  5. Required throughput (finished coils per 8-hour shift).
  6. Facility footprint, floor condition, transport distance, and designated AGV travel corridors.

Safety

The integrated line complies with international industrial safety directives:

  • EN ISO 12100:2010: Risk assessment and risk mitigation engineering.
  • EN 415-10: General safety requirements for automated packaging and coiling machines.
  • EN 60204-1: Electrical safety, earthing, and industrial machine control architecture.
  • ISO 3691-4: Functional safety and obstacle detection for driverless industrial trucks (AGVs).

Primary mechanical hazards include running high-speed wire strands, rotating vertical mandrels, and automated hydraulic/electric twisting cutters. Heavy steel perimeter fencing encloses the winder and strapping sectors. Overhead gantries feature access interlocks, control stations integrate Category 0 emergency stop pushbuttons, and AGV corridors are marked and monitored by dual safety laser scanners. Complete CE conformity documentation and guarding layouts are delivered per project specification.

Engineering FAQ

Q: What wire diameter range does the 360 m/min winder accommodate? A: The standard vertical elephant-trunk winder processes φ2 mm to φ4 mm drawn steel wire at continuous line speeds up to 360 m/min.

Q: What is the maximum finished coil payload? A: Finished packages range from 50 kg up to 1,000 kg, supported by the φ560 mm mandrel and the vertical doffing rack.

Q: When should our mill select steel wire binding over PET strapping? A: Heavy, springy, or oil-coated steel wire coils (especially approaching 500–1,000 kg) require through-the-eye steel wire ties to prevent hoop-stress failure and snap-back during transit. Lighter or coated wire products can utilize PET or PP strapping with friction-weld joints [manufacturer rating].

Q: Can one central binding station service multiple rewinding machines? A: Yes. Because standard automated strapping cycles run in ≤35 seconds per coil (supporting 20–40 coils/hour across an integrated line [manufacturer rating]), and rewinding a 1,000 kg coil of φ4 mm wire takes ≈ 28 minutes (up to ≈ 112 minutes for φ2 mm), a single wire-twist binding station coupled with AGV distribution comfortably balances multiple upstream winders.

Q: Are AGVs mandatory for coil transfer? A: No. Walking beams, powered roller conveyors with polyurethane (PU) protective roller sleeves, or standard overhead cranes can link the cells. AGVs provide the greatest layout flexibility for facilities with long travel routes or changing footprint layouts.

Next step

  1. Send your technical parameters (wire diameters, target coil weights, cycle rates per shift, and floor plan) to info@fhopepack.com.
  2. Our engineering team will calculate the winder configuration, binding cycle balance, and AGV routing requirements.
  3. Receive a formal technical proposal and quotation within 24 hours.

Sources

  • FHOPE Product Specification: Automatic Steel Wire Winding and Binding Machine
  • FHOPE Equipment Family: Automatic Steel Wire Coiling & Strapping Machine (FPCL-W500)
  • FHOPE Packaging Systems: Master Wire Coil Packaging Line
  • Standards: EN ISO 12100:2010, EN 415-10, EN 60204-1, ISO 3691-4

Last reviewed: 2026-10-19

Last updated: 2026-10-29

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