What are the reversible rolling stages of the rolling mill ?

After the end of the belt, first place the upper and lower work rolls ( when the belt is worn, the work rolls have been removed ) , then adjust the rolling line, close the rolling mill closing door, press the front platen, and the outlet side wiper presses the steel. Belt, rolling mill process lubrication cooling system starts the liquid supply, the rolling mill belt is pressed down, the coiler rotates to give the steel belt front tension, the machine before and after the thickness gauge and the speedometer enter the rolling line, and the unit runs the first rolling .

During the rolling process, if it is found that the defect of the edge of the steel strip will affect the high speed rolling, when the defective part passes the roll;

The operator presses the button on the console to input its defect position signal into the AGC system. At the end of the rolling, the rolling mill is decelerated. When the tail of the steel strip reaches the position of the front winder, the unit stops and the first pass ends. Thickness gauge, speedometer exit rolling

The line is rolled up, the tension of the steel strip is released, the cooling lubricant is stopped, and the pressure plate is lifted.

In the second rolling, the steel strips move in the opposite direction, and the positions in front of the machine are interchanged. After the second pass starts, the coiler is reversed.

To the front of the machine, the head of the steel strip is sent to the front of the reeling machine, and the jaws of the machine are clamped.

Then, a cooling lubricant feed mill, rolling reduction, the front and back coiler given transmission; ring 3 – is wound on the spool 2

Tension, the machine before and after the thickness gauge, the speedometer enters the rolling line, and the unit starts rolling in the second pass.

Starting from the second pass, the rolling is carried out between the front and rear coiler and the twenty-roll mill. Fully automatic control is achieved when the mill’s automatic thickness control (ACC) system is put into operation. When the steel has a defect in the rolling process, the rolling machine automatically decelerates. At the end of the rolling, the rolling mill will automatically stop.

Generally, the reversible rolling mill rolls an odd number of passes, but when the front and rear coiler is an expansion and contraction reel, the even track can be rolled.

The roll can also be unloaded on the side of the mill unwinder.

Generally, before the finished pass rolling, the work rolls need to be replaced to obtain high quality and special requirements for the surface quality of the steel strip.

the amount. After the finished pass rolling, the rolling mill stops, presses and picks up, the thickness gauge and the speedometer exit the rolling line, the rolling mill stops cooling the lubricating fluid supply, the coiler of the coiler is pressed down, or the unloading trolley is raised. The small seat roller is pressed against the steel coil to prevent the steel coil unwinding machine from rotating and winding the tail of the steel strip onto the reel. The reversible rolling process is now complete.

Unloading and rewinding stages: For expansion and contraction reel reels, unloading is relatively simple. First use the straps in the radial bundle of steel coils

When the tie is unfolded, the unloading trolley is raised to withstand the steel coil, the reeling machine reel is contracted, the jaws are opened, the steel coil is held by the unloading trolley, and the unloading trolley and the auxiliary pusher of the reeling machine are synchronously moved. The coil is unloaded from the coiler and the unloading trolley continues to move to transport the coil to the coil storage station.

For coilers with solid rolls before and after the mill, the coil cannot be removed directly from the drum, only the coil is re-rolled

The steel coil can be removed by going to a expansion and contraction reel take-up machine. When the Sendzimir 20-roll mill and the Sendway 20-roll mill use a solid reel reel, the unit is generally equipped with a rewind mechanism to transfer the finished steel coil and the solid reel from the take-up position to the rewinding unwinding. The position i then rewinds the coil from the uncoiler to the rewinding machine. Since the rewinding process is carried out at a position outside the rolling zone of the rolling mill, the rewinding and rolling can be carried out simultaneously without affecting each other.