AGC AFC APC Tandem Cold Rolling Mill Line With CPC Uncoiling
AGC / AFC / APC Tandem Cold Rolling Mill Line With CPC Uncoiling
Composition:
- Hydraulic expansion Uncoiler One Set
- Two-roll pinch, five-roll straighten device One Set
- Welding and cutting device One Set
- floor- type spiral loop One Set
- Entry processing platform One Set
- Main mill: Six Sets 4Hi Cold Mill
- Thickness gauge Six Sets
- Tension meter Five Sets
- Exit processing platform One Set
- Hydraulic expansion Recoiler: One Set
- Local operating box: Six Sets
- Central operating console One Set
- Hydraulic station: Three Sets
- Thin oil station Two Sets
- Emuslfied cooling system One Set
Flow:
Hydraulic Loading carriage →Hydraulic expansion uncoiler→ Five-roll straightening machine → Welding and cutting platform→ input processing platform→ Main Mill(6 sets 750 4Hi Cold Mill)→output processing platform→ Hydraulic expansion Recoiler→ Hydraulic Unload carriage
Parameters:
| Metal strip materials: |
|
Carbon Steel (Q195,Q235,08AL) |
| HRPO, HR Black steel, |
| After intermediate annealing |
| Coil ID: 508 mm； |
| Coil OD: max 1800 mm |
| Coil weight: max 12,000 kg |
| strip thickness: 2 - 3mm； |
| strip width: 550 - 750 mm； |
| Finished product specification: |
| Coil ID: 508 mm； |
| Coil OD:max 1800 mm |
| Coil weight: max 12,000 kg ( |
| Finished Strip thickness:0.25- 0.8mm； |
| Strip width: 550 - 750 mm； |
| Finished product precision: |
| Thickness difference in longitudinal direction(in stable rolling): |
| ＜±0.005mm(d<0.5mm) ＜±0.6%( over 0.5mm) |
| Machine parameters: |
| Max rolling force: 7000KN； |
| Max line speed: 360 m/min； |
| Threading speed: 20 m/min ； |
| Thickness reduction: |
| Max up to 90% thickness reduction(varying as per steel strip properties) |
| Recoiling tension: 70 kN |
| Recoiler motor: 430KW DC |
| Work roller diameter φ210mm - 200mm； |
| Backup roller diameter φ650 -620mm； |
| Mill columns section :350 x 450mm； |
| Backup roller bearing:FCD72104380 |
| Uncoiling mandrel diameter: 508mm |
| Recoiling mandrel diameter: 508mm |
| Max opening gap between work rollers:70mm |
| Hydraulic systematic pressure for press-up hydraulic cylinder:25 Mpa |
| Hydraulic pressure for roller bending, middle roller transferring,balance, side pushing: 21Mpa |
| Normal hydraulic pressure:10Mpa； |
| Recoiling motor: 430KW； |
| Main mill motor: 700KW x 6 |
AGC control:
Automatic thickness control system is composed of thickness gauge, electric control cabinet, the actuator to rectify thickness deviation. The thickness gauge continuously measure the strip thickness, one side display and record the thickness deviation, the other side input thickness deviation signal to electric control. The control cabinet deal with the thickness difference signal, give command to actuator to rectify the thickness, the actuator adjusts the press-down of mill to change roller gap by motor or hydraulic cylinders, or adjust recoiling tension by changing recoiler armature current, thus the strip thickness is rectified. The spring equation and elastic elongation curve to realize thickness control.
Control modes of AGC:
- Each side gap control: to control gap of each side roller, for making roller and each AGC hydraulic cylinder commissioning
- Each side rolling force control: to control each side rolling force to mark roller.
- Average gap control: to control average gap for position model rolling.
- Inclination control: to control the gap inclination of two sides, to adjust sheet flatness and deviation.
- Total rolling force control: to control total rolling force in rolling force model.
- In effective gap control mode, the gap inclination controller is activated to ensure gap of two sides the same, in effective rolling force control mode the rolling force difference controller is activated to ensure rolling force of two sides the same. The average gap control is default control mode to realize the non-impact switch between different models by setting present value and ramp following.
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