| Events | Reasons | Solutions | |
| 1 | Rolled parts not
bitten into the rolls and steels stacked |
The end part of a billet is forked | To pick out unqualified billet |
| The guide isn’t installed properly | To Reinstall the guide | ||
| The rolling piece in the guide orgroove is blocked | To remove away obstructive | ||
| Not polish new groove after replacenew groove. | To polish new groove andregulate the rolling speed | ||
| 2 | Steels piled after
the rolling piece have been bitten into the rolls |
The speed of rolling piece isn’t right. | Correctly setting the speed |
| Roll diameter input error | To input the correct rolldiameter | ||
| Tension setting is too small afterchanging rolls and grooves | Increase the tension settingappropriately | ||
| Incomplete grinding after changingnew groove | Further grinding of the rolls | ||
| 3 | Steel stackeddue to steel
jamming between rolls |
Motor overload,overspeed,and
dropout |
Check steel temperature,roll
size,rolling speed and |
| electrical faults | |||
| 4 | Flying shear
1#,2#steel stacking |
Flying shear overrun speed is toolow | Increase the overrun speedof flying shear |
| Flying shear does not cut the head | Check power supply,hotmetal detector | ||
| Shear blade aging or poor overlap | Replace shear blade,adjustoverlap | ||
| Interrupt flying shear action | Checking hot metaldetectors | ||
| Electrical problems | Electrical inspection | ||
| 5 | Stacking steel in
the loops |
Start roller action too early or too
late |
Inspection of roll diameter
input,frame selection, detector position,etc. |
| Loss of rolling signal,detection of
false signal |
Electrical,pressure gas,
equipment inspection |
||
| Too much cooling water or
improperly poured position |
Adjust accordingly | ||
| 6 | Pile of steel at
the flying shear after the finishing mill |
Flying shear speed is too low | Adjustment of flying shearoverrun speed |
| No.3 shear after the flap is out ofcontrol | Inspection of electrical | ||
| There is debris in the bypass roller
channel and shear front guide tube |
Clean up debris | ||
| High water pressure in thewater-cooled section | Adjust water pressure andwater volume | ||
| 7 | Steel stacked at
between flyshear to the entrance of cooling bed |
Inaccurate setting of apron roll table
and steel splitter |
Adjust steel splitting action
parameters |
| There are other things in the apronroll table | Clean objects | ||
| Apron roll table trips | Check electrical faults | ||
| Severe wear of apron roll table | Replace apron or table |
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