High-Speed Wire Rod Rolling Mill: Key Equipment & Technical Specifications
The high-speed wire rod rolling mill is a critical component in modern steel production lines, designed to efficiently produce high-quality wire rods with diameters ranging from 5.5 mm to 16 mm at speeds up to 100 m/s. This article provides a comprehensive overview of the major equipment and technical specifications of a typical high-speed wire rod mill, covering roughing, medium, pre-finishing, finishing stands, flying shears, coilers, and auxiliary systems.
1. Roughing Mill (1H–5H)
The roughing mill consists of five high-stiffness closed-type horizontal 550 mm rolling stands. These stands are designed to reduce the initial billet size to a suitable dimension for subsequent passes.
1.1 Roll Specifications
- Roll Diameter × Roll Body Length: Ø520 mm – Ø610 mm × 800 mm
- Roll Material: High-strength forged steel
1.2 Maximum Rolling Force & Torque
| Stand | Max Rolling Force (kN) | Max Rolling Torque (kN·m) |
|---|---|---|
| 1H | 2022 | 237 |
| 2H | 2568 | 273 |
| 3H | 1787 | 204 |
| 4H | 2133 | 198 |
| 5H | 1379 | 137 |
1.3 Frame Shift & Roll Change Hydraulic Cylinders
- Model: C25JG200/125–3200MⅢ
- Working Pressure: 16 MPa
- Stroke: 3200 mm
1.4 Frame Locking System
- Spring Clamping Force: 3540–4429 kg
- Hydraulic Release Pressure: 10 MPa
- Test Pressure: 15 MPa
- Cylinder Size: Ø240 / Ø200 mm
- Stroke: 40 mm
1.5 Main Motor Specifications
| Stand | Motor Model | Power (kW) | Speed (r/min) |
|---|---|---|---|
| 1H | Z450-3B | 500 | 600 / 1500 |
| 2H | Z500-2B | 700 | 750 / 1500 |
| 3H | Z500-2B | 700 | 750 / 1500 |
| 4H | Z560-1B | 800 | 750 / 1500 |
| 5H | Z500-2B | 700 | 750 / 1500 |
1.6 Main Reducer Gearbox Total Transmission Ratio
| Stand | Total Gear Ratio (i) |
|---|---|
| 1H | 74.353 |
| 2H | 64.638 |
| 3H | 46.139 |
| 4H | 40.618 |
| 5H | 32.020 |
- Output Shaft Center Distance: 580 mm
2. Medium Rolling Mill (6H–13H)
This section includes eight horizontal closed-type rolling stands, providing intermediate reduction before final shaping.
2.1 Roll Specifications
| Stand | Roll Diameter × Roll Length |
|---|---|
| 6H, 7H | Ø520–Ø610 mm × 800 mm |
| 8H–11H | Ø420–Ø495 mm × 800 mm |
| 12H, 13H | Ø330–Ø380 mm × 800 mm |
2.2 Maximum Rolling Forces
| Stand | Max Rolling Force (kN) |
|---|---|
| 6H | 1754 |
| 7H | 1076 |
| 8H | 1056 |
| 9H | 638 |
| 10H | 730 |
| 11H | 426 |
| 12H | 376 |
| 13H | 228 |
2.3 Main Motor Specifications
| Stand | Motor Model | Power (kW) | Speed (r/min) |
|---|---|---|---|
| 6H | Z560-2B | 900 | 750–1500 |
| 7H | Z560-1B | 800 | 750–1500 |
| 8H | Z560-2B | 900 | 750–1500 |
| 9H | Z560-1B | 800 | 750–1500 |
| 10H | Z560-2B | 900 | 750–1500 |
| 11H | Z560-1B | 800 | 750–1500 |
| 12H | Z560-2B | 900 | 750–1500 |
| 13H | Z560-1B | 800 | 750–1500 |
2.4 Main Reducer Gearbox Reduction Ratios
| Stand | Reduction Ratio |
|---|---|
| 6H | 46.139 |
| 7H | 35.945 |
| 8H | 20.070 |
| 9H | 12.226 |
| 10H | 10.887 |
| 11H | 8.882 |
| 12H | 4.654 |
| 13H | 2.341 |
3. Pre-Finishing Mill
The pre-finishing mill features two independently driven DC motors and precision gearboxes.
3.1 Drive System
- Drive Type: Individual DC motor drive
- Motor Model: Z450-3B
- Power: 550 kW
- Speed: 600 / 1500 rpm
3.2 Gearbox Models
- First Horizontal Stand: ZDY-300-1.517
- Second Horizontal Stand: ZDY-300-1.028
- Gear Precision: Hardened, ground, profiled teeth
- Gear Accuracy: Grade 5 (ISO)
- Bevel Gear Accuracy: Grade 5
3.3 Roll Ring Specifications
- Dimensions: Ø285 / Ø225 × 95 / 70 mm
- Material: Tungsten Carbide
4. Finishing Mill (18H–27H)
The finishing mill comprises 10 stands arranged in a 90° cross-rolling configuration with 45° staggered angles between adjacent frames.
4.1 Roll Ring Specifications
| Stand Group | Max–Min Diameter × Width |
|---|---|
| 18H–22H | Ø228.3–Ø205 × 72 mm |
| 23H–27H | Ø170.66–Ø153 × 70 mm |
4.2 Layout & Drive System
- Arrangement: Alternating 90° orientation
- Transmission: 10-stand centralized drive
- Product Range: Ø5.5 mm – Ø16 mm
- Max Working Speed: 90 m/s
- Coiling Speed: Up to 100 m/s
4.3 Main Drive Motor
- Type: AC Synchronous Frequency Converter Motor
- Power: 5500 kW
- Speed: 1000–1500 rpm
4.4 Speed Increase Gearbox Ratios
- Odd Stands: 0.38
- Even Stands: 0.3066666
4.5 Lubrication System
- Oil Flow Rate: 120 L/min
- Alarm Threshold: 90 L/min
5. Flying Shears
5.1 No. 1 Flying Shear (Curved Crank Type)
- Cutting Area: Max 7854 mm²
- Shearing Speed: 0.6–1.4 m/s
- Head Cut Length: 50–200 mm
- Break Length: 800–1000 mm
- Operating Temp: ≥900°C
- Motor Power: 455 kW
- Motor Speed: 600 rpm (DC 660V)
- Lubrication: Centralized thin oil (main body), oil bath (reducer), grease (blade shaft)
- Coupling: GII CL12 Drum Tooth Coupling
5.2 No. 2 Flying Shear (Rotary Type)
- Cutting Area: Max 965 mm²
- Shearing Speed: 3–6 m/s
- Head/Tail Cut: <250 mm
- Break Length: <1000 mm
- Temp: ≥850°C
- Motor Power: 320 kW
- Coupling: GCLD8, 5-grade tooth accuracy, interference-fit bolts
- Lubrication: Centralized thin oil
5.3 No. 3 Flying Shear
- Shear Force: 15 tons
- Cutting Area: Max 380 mm²
- Temp: ≥850°C
- Speed: 5–17.5 m/s
- Type: Rotary shear, start-stop operation
- Motor: ZTFS-355-22, 225 kW, 450 rpm
- Collection Cylinder: Ø200×Ø50 mm, Stroke: 500 mm
- Switch Cylinder: Ø100×Ø32 mm, Stroke: 180 mm
- Coupling: GIICL10
- Gear Accuracy: Grade 6, SKF Bearings
5.4 Breaker Shear
- Force: 15 tons
- Temp: ≥850°C
- Area: Max 380 mm²
- Break Length: ≤400 mm
- Speed: 5–17.5 m/s
- Type: Continuous rotary shear
- Motor: Z4-250-31, 132 kW, 1000 rpm
6. Guide Rolls (Feed Rolls)
- Speed Ratio: 1 / 9.467
- Input Size: Ø5.5–16 mm
- Input Speed: 14.4–90 m/s
- Roll Ring: Ø180 × 72 mm
- Motor: Z4-280-32 (with encoder), DC 160 kW, 750 / 1700 rpm
7. Coiler (Wire Coiling Machine)
- Coil Diameter: Ø1050 mm (nominal)
- Average Coil Diameter: Ø1050 mm
- Inclination Angle: 15° from horizontal
- Min Product Temperature: 580°C
- Max Coiling Speed: 100 m/s
- Wire Diameter: Ø5.5–16 mm
- Motor: Z4-280-42, DC 250 kW, 1000–1800 rpm
Conclusion
This high-speed wire rod mill system demonstrates advanced engineering in terms of high-speed rolling, precision control, and automation. With powerful motors, accurate gear ratios, and efficient cooling/lubrication systems, it ensures consistent quality output across various wire rod sizes.
Whether used in long product mills or specialty steel plants, this configuration supports high throughput, low energy consumption, and minimal downtime—key factors in competitive steel manufacturing.
For engineers, plant managers, or procurement teams seeking reliable wire rod mill solutions, understanding these specifications helps ensure optimal performance, maintenance planning, and scalability.
