Φ320/Φ250×250 Four-Stand Two-Roll Cold Rolling Mill Line
Brand name: HANI
Packing Details : Wooden box with fumigation or Wooden Fram or Steel Frame
Delivery Details: 30~60days or Based on the quantity
Shipping: Sea freight、Land freight、Air freight
HANI focuses on cold rolling mill equipment technology, safeguarding your production.
Product Details
Φ320/Φ250×250 Four-Stand Two-Roll Cold Rolling Mill Line
HANI TECH
Equipment Overview
This cold rolling mill line is designed for continuous rolling of steel strip. The system features four tandem rolling stands for precision thickness reduction and surface finishing.
Technical Specifications
Material Processing Range
- Material Grade: Q195-235 (Annealed)
- Input Thickness: 2-10mm
- Output Thickness: ≥1mm
- Strip Width: 100-200mm
- Coil Inner Diameter: Φ508mm
- Max Coil Diameter: Φ1600mm
- Max Coil Weight: 3000kg
Performance Parameters
- Rolling Force: ≤200 tons / 150 tons
- Rolling Speed: 0-60 m/min (Exit speed of final stand)
- Coiling Tension: ≤30KN
Process Flow
Hydraulic Uncoiler → Shearing & Welding → Stand #1 Rolling → Stand #2 Rolling → Stand #3 Rolling → Stand #4 Rolling → Shearing → Recoiler
Main Equipment Components
1. Hydraulic Uncoiler
- Four-cone hydraulic expansion/contraction mandrel
- Mandrel size: Φ500×220mm
- Expansion range: 40mm (Φ470-Φ510mm)
- Max load capacity: 3 tons
- Center height: 900mm
- Manual brake adjustment
2. Shearing & Welding Platform
- Includes traverse work table, shearing machine, clamping mechanism, welding machine
- Hydraulic cylinder clamping during welding
- Strip cutting function with welding-ready cut surface
- Butt welding operation: Manual
- Platform movement: Manual
3. Rolling Stand #1 (Φ320×250)
Reduction System:
- Reduction motors: Y-type, 3kW×2
- High-speed worm gearbox: Center distance 120mm, M=4, Z=45
- Low-speed worm gearbox: Center distance 210mm, M=7, I=26
- Reduction screw: TsΦ70×6
- Reduction speed: 0.051mm/s
- Simultaneous or independent up/down control
Frame Structure:
- Closed housing, column section: 200mm×250mm smooth surface
- Material: ZG35 cast steel
- Integral casting and machining
- Welded base, frame moves as unit
Roll System:
- Work roll size: Φ320×250mm
- Surface hardness: HRC 66°
- Roll material: Special flat steel grade
- Neck diameter: Φ180mm
- Bearings: FC special bearings, Model FC3652168
- Lubrication: Oil cooling circulation system
- Balance device: Spring balance
Main Drive:
- Motor: 90kW AC variable frequency, 1480 rpm
- Reducer: ZSY series
- Herringbone gearbox: Center distance 320mm, M=8, B=310mm, HF hardened teeth
- Lubrication: Self-splash lubrication
- Drive shaft: WS universal joint Φ250×1200mm (2 pieces)
- Base: Welded with stress relief treatment
Note: Entry guide installed before stand, tension stand installed after stand
4. Rolling Stands #2, #3, #4 (Φ250×250 each)
Reduction System:
- Reduction motors: Y-type, 2.2kW×2
- High-speed worm gearbox: Center distance 120mm, M=4, Z=45
- Low-speed worm gearbox: Center distance 210mm, M=7, I=26
- Reduction screw: TsΦ70×5
- Reduction speed: 0.051mm/s
Frame Structure:
- Closed housing, column section: 180mm×220mm smooth surface
- Material: ZG35 cast steel
- Integral casting and machining
Roll System:
- Work roll size: Φ250×250mm
- Surface hardness: HRC 66°
- Roll material: Special flat steel grade
- Neck diameter: Φ130mm
- Bearings: FC special bearings, Model FC2640125
- Lubrication: Grease lubrication
- Balance device: Spring balance
Main Drive:
- Motor: 75kW AC variable frequency, 1480 rpm
- Reducer: ZSY series
- Herringbone gearbox: Center distance 252mm, M=8, B=274mm, HF hardened teeth
- Lubrication: Thin oil lubrication
- Drive shaft: WS universal joint Φ200×1200mm (2 pieces)
- Base: Welded with stress relief treatment
Configuration: Stands #2-4 have entry guides; Stands #2-3 have tension stands after; Stand #4 has deflector roll after
5. Hydraulic Recoiler
- Four-cone mandrel configuration
- Mandrel size: Φ500×250mm
- Expansion range: 40mm (Φ478-Φ508mm)
- Drive motor: 22kW-6 AC variable frequency
- Custom reducer (i=40.17), speed matched to mill
- Max load capacity: 3 tons
- Center height: 900mm
- Complete hydraulic station included
6. Electrical Control System
- Complete electrical control package
- Main control console: 1 unit
- Local control stations: 4 units
- Main mill drives: Invt frequency inverters
- System control: Siemens PLC
- Display: LCD screen for data display and settings
- Automatic speed balancing across entire line
- One-button start/stop for complete line
- Emergency stop buttons on main console and key equipment
- Individual equipment start/stop capability
- Single-machine jog forward/reverse function
Protection & Safety Features:
- Overload protection
- Strip break detection and emergency stop
- Cooling system monitoring
- Fault alarm system
- Production automation
Instrumentation:
- Tension display
- Current and voltage monitoring
- Rolling speed display
- Strip break emergency stop function
- Production length counter
Component Brands:
- Contactors, circuit breakers, switches: Schneider
- PLC: Siemens
- Relays: Omron
Warranty & Service
Warranty Period: One year from commissioning and acceptance
Coverage: Free replacement of parts damaged by non-user causes (excludes wear parts and user operation errors)
Response Time: Within 24 hours of service request
Technical Support: Qualified service personnel dispatched to site
Post-Warranty: Spare parts available at cost, technical service arranged as needed
Frequently Asked Questions (FAQ)
What materials can this rolling mill process?
The mill processes Q195-235 grade steel (annealed material) with input thickness of 2-10mm and width of 100-200mm. The output thickness is 1mm or greater.
What is the maximum rolling speed?
The maximum rolling speed is 60 meters per minute, measured at the exit of the final stand. Speed is continuously adjustable from 0-60 m/min.
How many rolling stands are included?
The system includes four tandem rolling stands: one Φ320×250mm stand and three Φ250×250mm stands in continuous configuration.
What is the maximum coil weight capacity?
Both the uncoiler and recoiler support a maximum coil weight of 3000 kg (3 tons).
What type of control system is used?
The mill uses Siemens PLC control with LCD display, Invt frequency inverters for main drives, and branded components (Schneider contactors, Omron relays). It features one-button start/stop, automatic speed balancing, and comprehensive safety protection.
What is the rolling force capacity?
The first stand provides up to 200 tons of rolling force, while the subsequent stands provide up to 150 tons.
Does the system include welding capability?
Yes, a shearing and welding platform is included for butt welding of strip ends, allowing continuous operation.
What maintenance support is provided?
Installation guidance, commissioning, operator training, one-year warranty, 24-hour response time for service requests, and post-warranty spare parts availability.
What safety features are included?
The system includes overload protection, strip break detection with emergency stop, cooling system protection, fault alarms, emergency stop buttons on all major equipment, and comprehensive monitoring.
What is the typical application for this equipment?
This cold rolling mill line is ideal for producing thin steel strip from thicker material, commonly used in metal stamping, construction materials, automotive parts, appliance manufacturing, and other flat steel processing applications.
HANI is one of China’s leading professional cold rolling mill manufacturers, providing complete cold rolling systems to steel companies worldwide. HANI focuses on designing and manufacturing integrated cold rolling solutions that meet the industry’s highest standards of precision, efficiency, and durability. Our engineering expertise lies in providing turnkey cold rolling production lines to optimize the performance of modern steel manufacturing plants.
