1. General Information
The production of this unit is to roll hot rolled coils with the thickness of 2~4.0mm into high precision cold rolled coils with the thickness of 0.12~1.2mm through several time of rolling. The scale of the cold rolling production line is a production of 180 thousand tons of cold rolled steel coils per year. It adopts the UCM-type single-stand 6-roll reversible cold rolling mill. The work roll of the rolling mill is equipped with positive and negative bending. The intermediate roll is equipped with positive bending and twitch. The uncoiler is equipped. Both front and rear frames are equipped with coiler, thickness gauge, velocimeter etc., which can realize large tension rolling and guarantee high-speed and stable production with specified thinness.
2. Features of the Rolling Mill
1250 6-roll reversible cold rolling unit is the cold rolling production line with designed annual output of 180 thousand tons and adopts UCM-type single-stand mill. Roll pickled hot rolled coils into cold hard coils. The unit is equipped with hydraulic AGC. The work roll is equipped with positive and negative bending and subsection cooling. The intermediate roll is equipped with the positive bending and moving, and the front and rear frames are equipped with double X-ray thickness gauge, double-laser velocimeter, etc.
Features:
1). Uncoiler is equipped with CPC automatic centering function, which adopts EMG products from Germany, and improves the centering response speed and position control accuracy.
2). Rolling line adjustment equipment adopts stepwise wedge combination adjustment, and the input roll diameter can quickly and automatically control the stepwise wedge displacement of the oil cylinder drive to the right position, realizing automatic and quick adjustment of the rolling line (company's utility model patent: ZL201120139812.6);
3). 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.
4). Double-station roll changing carriage is adopted, which realizes the swift changing between the work roll and the intermediate roll.
5). Roll system of the rolling mill, the turning roll, and the oil removal roll bearing adopt air-oil lubrication, which can prolong the bearing's life and reduce oil consumption, pollution and maintenance quantity with high lubrication efficiency.
6). X-ray thickness gauge is adopted, improving the thickness precision of finished strips.
7). velocimeter is adopted to realize mass flow AGC control in combination with AGC system, with improved the yield of strips.
8). The rolling mill adopts Simens S7-400 programmable controller, DC drive adopts 6RA80 all-digit speed regulating system, and 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.
9). AGC automatic system adopts "S7-400+FM458" structure, which makes the utmost use of the controller and matches the quick response of the high-speed rolling mill.
10). In the second-level automation controlled by AGC, rolling schedule is further improved.
11). All key components and parts of hydaulic system adopt import components and parts, which improves system reliability.
12). Hydaulic AGC system is equipped with advanced functions of constant roll gap control, constant roll force control, constant thickness control, mass flow control, thickness precontrol, tension/speed automatic control, etc.
Configuration of cold rolling mill :
Specifications of Supplied Materials
Material:Q195,08Al,Q235,SPHC,SPHD,SPHE
Mechanical Property:σs≤380 N/mm²
Requirements:
1) Strip camber: ≤5mm/2m; tower: ≤5mm
2) Strip passband tolerance: ≤±0.15mm; transverse difference: ≤0.20mm
3) Uniform hardness, and no obvious defects like inclusions, sinkholes or raw edges.
Thickness:4 mm
Width:1500 mm
Coiling diameter (inner/outer):508/610 mm
Max coil weight:25t
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Thickness:0.25 mm
Width:1500 mm
Coiling diameter (inner/outer):508/610 mm
Max coil weight:25 t
Longitudinal thickness tolerance(rolling at stable speed): <±0.005mm(d≤0.5mm)
<±1.0%d (d>0.5mm)
Longitudinal thickness tolerance(speeding up or slowing down): <±0.01mm(d≤0.5mm)
<±2.0%d (d>0.5mm)
Transverse thickness tolerance(rolling at stable speed): <±1.5%d
Shape tolerance: ≤40I
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Feel free to contact me if you are interested in our machine products: Tony Liu (Sales Manager)
Audited Supplier 
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