Φ235×950/Φ720×880㎜(4-stand)

Φ235/Φ265/Φ720×880㎜(1-stand)

5-stand cold tandem mill（double uncoiling, double coiling）

I. Rolling condition

1.steel grade：

steel grade：hot rolled pickled coil Q195、Q215、Q235 etc.

yield strength：σs=140～260MPa

2.spec. of raw material:

thickness：2.5～4.0mm

width：600～850mm

ID of the steel coil：φ508mm

OD of the steel coil：(max)φ2000mm

Coil weight：(max)18t

3.product spec.:

thickness：0.4～2.0mm

width：600～850mm

ID of the steel coil ：φ508mm

OD of the steel coil ：(max)φ2000mm

Coil weight ：(max)18t

4.main technical parameters：

Type of the line：

F1～F4：Φ235×950/Φ720×880㎜ 4-hi cold rolling mill

F5：Φ235×880/Φ265×880/Φ720×880㎜ 6-hi cold rolling mill

Pressing method：whole hydraulic pressure down AGC

Max rolling force：8000KN

Rolling speed：(max)600m/min

Front loop speed：(max)300m/min

Coiling speed：(max)600m/min

Coiling tension：(max)48KN

5.feeding direction：from left to right

II.Technical flow

1# loading car→1# uncoiler→1# pinch leveller→Guiding Plate Table→entry pinch platform【2# loading car→2# uncoiler →2# pinch leveler】→guiding plate table→Convergence pinch Platform→cutting and welding platform→horizontal loop→entry technial table→front S roll group with speed measuring device→1# housing entry device→F1 4-hi mill→tension measuring, speed measuring, thickness measuring device→F2 4-hi mill→tension measuring, speed measuring device→F3 4-hi mill→tension measuring, speed measuring device →F4 4-hi mill →tension measuring, speed measuring device →F5 6-hi mill→speed measuring device →exit technical table with thickness measuring device→ rear double S roll group →2-roll pinch device→power flying shear→1# turning roll（with guiding plate）→1# coiler （with belt wrapper）→1# unloading car→Bridge support bracket (magnetic belt conveyor) →2# turning roll（with guiding plate） →2# coiler （with belt wrapper） →2# unloading car

III. Installation Level

1. The system employs an AC variable-frequency drive with a fully digital speed control system (using domestically manufactured frequency converters), and the unit is controlled by a Siemens S7-1500 series PLC.

2. Fully hydraulic pressing with automatic thickness control (AGC). The hydraulic AGC system is PLC-controlled and features constant roll gap, constant rolling force, preset thickness regulation, and thickness monitoring capabilities.

3. The rolling mill features pressure and deflection control. The rolling line automatically adjusts, and the dual-station horizontal transport vehicle offers rapid roll change functionality.

4. It is equipped with double-uncoiler and front loop system, rear flying shear and double-coiling system,which can realize headless tension continuous rolling.

5. The rolling mill's electrical system is equipped with safety protection systems such as overload protection and emergency shutdown.

6. Automatic tension adjustment during continuous rolling, with automatic constant tension control.

7. The rolling mill employs a dual-roll drive system for the working rolls, with the connecting shafts linked by a universal cross-type metallurgical coupling.

8. The roller bearings are lubricated with air oil

9. The rolling line production process interlocks and fault alarms are implemented using PLC-based programmable control, achieving full automation of the manufacturing process.

10. The whole line is equipped with a system for presetting process parameters, as well as for monitoring, displaying, and alarming for process parameters and key equipment parameters.