1.2 roll change and check as planned.
A) nozzle status, position and blockage
B) Confirm the position of the rolling line.
C) The oil mist pipe is well connected.
1.3 Prepare the materials as planned, and pay attention.
A) Peel off a layer of surface to prevent dust and adhesive tape from entering the rolling mill and roll marks.
B) Confirm the end surface quality of the coil? Slight and sharp protrusions are regarded as circular arcs. 2. 1 Rolling with new work roll
2. 1. 1 hot rolling for 3 ~ 5 minutes according to the running state of the roll during normal rolling? After heating, you can lose a few rollers.
2. 1.2 AFC nozzle injection ratio is controlled at the lower limit of the process table, which can quickly reach the ideal shape and then recover.
2. 1.3 Use the back tension as much as possible, and recover after the front tension is stable.
2. 1.4 Have proper rolling force, bending force and inclination angle? Mainly rely on the usual experience accumulation, to avoid one side loose, one side tight or both sides too loose and too tight.
Reach the target thickness as soon as possible at the speed of 2. 1.5 liters.
2.2 Speed increase in normal rolling process
2.2. 1 according to the values of coiling parameters, the rolling force, bending force and inclination angle are preset, so that a stable shape can be obtained.
2.2.2 The lifting speed can be achieved in one step. Do not adjust the tension value before reaching the target thickness, which is not conducive to flattening.
2.3 Speed-up slippage, cracking and belt breakage are mainly handled in four-pass rough rolling.
2.3. 1 shorten the deformation time of the rolled piece, increase the rolling force, and then appropriately increase the tension.
2.3.2 In order to improve the lubrication conditions, a lower oil temperature is adopted, and the oil injection at the crack opening is normally open.
2.3.3 Roll change when rolling still fails. 3. 1 Good alignment, especially for wide materials, will cause one side to be loose and the other side to be tight, resulting in the phenomenon of edge cracking and double tendons being loose, which will affect the next production.
3.2 AFC shall periodically zero the plate roller in the running state.
3.3 When the two ribs are loose, the fuel injection ratio in AFC will decrease.
3.4 How long does it take to wash the waste with oil when the belt is broken? All oil injection should be turned on to avoid the change of roll shape.
3.5 Adjustment during wrinkling, folding, stacking and unfolding
3.5. 1 Ensure the uniform and reasonable distribution of oil droplets.
3.5.2 Reasonable control of front tension.
3.5.3 Adjust the position of the flattening roller or replace the flattening roller.
3.6 Handling of skidding and screaming: slow down first, and then raise or lower the oil temperature to improve the lubrication conditions.
4. 1 Increase the rolling force, keep the roller bending synchronous and keep the edge loose.
4.2 The first two times can also increase the positive tension.