Description:

6-ROLL REVERSIBLE COLD ROLLING UNIT1250MM

6-roll Reversible Cold Rolling Unit1250mm
Part 1. Overview
1.1 General introduction
The unit is an old 1250 6-high cold rolling mill. It was installed and put into operation in 2012. It
stopped production in 2017. During the production period, the mill runs steadily, the product quality is stable. The width of the rolling product specification is 800-1200mm, and the thickness of the finished product is 0.3-0.15mm. The rolling mill adopts a single stand reversible six-high UCM cold rolling mill. The working rolls of the mill are equipped with positive and negative bending rolls, the middle rolls are equipped with positive bending rolls and twitching. It is equipped with uncoiler, tension coiler and thickness gauge in front and back of frame to ensure high-speed and stable production of thinner products.
1.1.2 Its Characteristic
The 1250 6-high reversible cold rolling mill adopts a single stand UCM model, it rolls the pickled hot
rolled coil into cold and hard coil. The unit is equipped with hydraulic AGC, working roll with positive
bending roll, intermediate roll with positive bending roll and moving, double X-ray thickness gauge in front and back the mill. Its characteristics are as follows:
1. Uncoiler is equipped with CPC automatic centering function, which improves the centering
response speed and position control accuracy.
2. Positive and negative bending of the work roll; the intermediate roll has transverse moving
presetting, locking, and positive bending control measure. The bending roll can be controlled
from single side; rollers are equipped with subsection cooling and roll shape adjustment.
Multiple-plate-shape control measure is able to better control the plate shape of finished strips.
3. Double-station roll changing carriage is adopted, which realizes the swift changing between the
work roll and the intermediate roll.
4. Roll system of rolling mill has high lubrication efficiency, which improves the bearing life, lower the oil consumption, pollution and maintenance rate.
5. Imported X-ray thickness gauge is used to improve the thickness accuracy of finished strip.
6. the electric system takes safety protection measures of overload protection, strip breakage
protection, emergency cut-off, etc.; the unit is equipped with functions of strip tail automatic
deceleration, accurate stopping and multi-point stopping; coiler is equipped with functions of
cycle memory, strip length calculation, and jaw accurate positioning.
7. In the second-level automation of AGC control, the rolling schedule has been further improved.
8. All key components and parts of hydraulic system adopt import components and parts, which
improves system reliability.
9. Hydraulic AGC system is equipped with advanced functions of constant roll gap control,
constant roll force control, constant thickness control, mass flow control, thickness pre-control,
tension/speed automatic control, etc.
1.2 Basic technical data
1.2.1 Materials and Products
1.2.1.1 Specification of incoming material
Material：Q235、SPHC、SPHD、SPHE 、Q195、08Al、
Thickness：1.8~4.0 mm
Width：800~1200 mm
Diameter of steel coil (inner/outer)：610/1800 mm
Max steel coil weight：15 t

1.2.1.2 Finished products specification
Thickness：0.25~2.0 mm
Width：750~1200 mm
Diameter(inner/outer)：508/1800 mm
Max coil weight：15 t

1.2.2 Main Technical Parameters of the Unit
1) Specification of rolling mill： 1150/420/3501450 mm
2) Max rolling force： 12000 KN
3) Max threading speed： 30 m/min
4) Max uncoiling speed： 210 m/min
5) Max rolling speed： 600 m/min
6) Uncoiling tension： 50～5 KN
7) Coiling tension： 140～14 KN
8) MAX Coiling speed： 650 m/min
9) Work roll size： 255x1380 mm
Intermediate roll size： 3001250 mm
Back up roll size： 9601200 mm
Transverse displacement of intermediate roll： 125 mm
10) Maximum opening of work roll： 15 mm
11) Drum diameter of Uncoiler： 560～ 620 mm
12) Coiler Reel diameter： 495～ 510 mm
13) Uncoiler alignment range： 75 mm
14) Rolling line elevation： +1000 mm
15) Driving Direction of Unit：
16) Installation Capacity of Machinery, Equipment and Electrical Appliances of Units
DC/： Master motor： 1150KW，2sets
Front and rear coiling motors： 630KW，2 sets for each
Uncoiling motor： 300KW，1set
Installation capacity：1150KWx2+630KWx4+300KW=5120 KW
AC： ≈500 KW
17) Unit Outer Size (Long x Width x High)： ≈25x28x10 m
＜1.5%
Part 2: equipment list
2.1 mechanical equipment list
1 uploading trolley 1
2 uncoiler 1
3 Starting straightening machine 1
4 coiling machine in front of the mill 1
5 unloading car 2
6 device in front of the cold rolling mill 1
1)Front Steering and Feeding Device 1
2）Thickness gauge bench 1
3）Degreasing unit 1
4）Centralized Guidance Device 1
5）pedestal 1
7 1450 6-high reversible cold rolling mill 1
8 Rear mechanism 1
1）Degreasing unit 1
2）Thickness gauge bench 1
3）Hydraulic shears 1
4）Rear steering feed device 1
5）pedestal 1
9 coiler at the rear of cold rolling mill 1
10 roll-changing device 1
1）Single station work roll and intermediate roll change device 1
2）Backup roll change device 1
11 spare parts Several On-site inventory
2.2 hydraulic equipment list
1 Hydraulic Pressure Up Control System (AGC) 1 set
2 Hydraulic Control System for Balancing,Bending, Transverse Shift and Rolling Line
Adjustment 1set
3 centering control system 1set
5 Thin oil lubrication system 1set
6 Oil and gas lubrication system 1set
7 Process lubrication system and roll cooling system 1set
8 Pneumatic system 1set
10 Smoke Exhaust and Smoke Purification Device 1set
2.3 Electrical automation system: 1 set