1780mm 4Hi Reversible Cold Rolling Mill

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1780mm 4Hi Reversible cold rolling mill

 1.General Information
This unit produces a pickled hot rolled coil with a thickness of 6mm, which is rolled into several high-precision cold-rolled coils of 0.5-4.5mm by several passes, using a single-stand reversible four-roll UCM cold rolling mill. The work rolls are provided with positive and negative bends, the intermediate rolls are provided with positive bending rolls and twitching, and the uncoiling machine and the front and back of the frame are provided with a tension coiler, a thickness gauge, a laser speedometer, etc., which can realize large tension rolling. Guarantee high-speed and stable production of thin gauge products.
 
2.Characteristics of the Rolling Mill
The 1780 4Hi reversible cold-rolling unit is designed for a cold-rolling line with an annual production capacity of 200,000 tons and is available in a single-bay UCM model. The acid washed hot rolled coil is rolled into a chill roll. The unit is equipped with a hydraulic AGC, a work roll with a bending roller and a segmental cooling machine before and after the double X-ray thickness gauge. Its characteristics are:
 
Uncoiler is equipped with CPC automatic centering function, which adopts EMG products from Germany, and improves the centering response speed and position control accuracy.
 
+Rolling line adjustment equipment adopts stepwise wedge combination adjustment, and the 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 (companys utility model patent:  ZL201120139812.6);
 
+Work roll bending roll; bending roll can be controlled separately on one side; roll section cooling roll type adjustment. A variety of plate type control methods can better control the shape of the finished strip.
 
+ImportedX-ray thickness gauge is adopted, improving the thickness precision of finished strips.
+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.
+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.
+In the second-level automation controlled by AGC, rolling schedule is further improved.
+All key components and parts of hydraulic system adopt import components and parts, which improves system reliability.
+Hydraulic 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.
 
3.Specifications of Supplied Materials
 

1. Rolling mill specification:F 1450/F 420 1900mm
2. Max rolling pressure: 18000 KN
3. Max rolling torque:100 KN.m
4. Max threading speed: 30m/min
5. Max uncoiling speed: 300m/min
6. Max rolling speed:                  600 m/min
7. Uncoiling tension: 50 KN
8. Coiling tension:                    180~18 KN  

1. Max coiling speed:                  620m/min