Tthe Ooptimization Of Leveler Roller Position Adjustment Control

The equipment level is an important factor of the rolling processlevel. With the continuous improvement of the level of equipment, steelrolling capacity has been fully released, and the quality of steel is alsoraising with the equipment' improvement. Baosteel5M heavy plateproduction line,with the world's most advanced equipment,was put intooperation in2004, which indicates that China has occupied a place in theworld of heavy plate.For control limited, cooling or other factors after the completion ofthe Mill, plate after plate rolling mill are often unable to meet thetechnical requirements, showing a common form of edge waves, wave,buckle head, tail bending characteristics.It requires auxiliary equipmentafter rolling to meet the requirements of the steel plate straight for theusers. Cold plate leveler(CPL) is one of the important mill auxiliaryequipment. The leveler has complex process model, known as the smallmill, and its control functions have a direct impact on the steel platestraightening effect. The machinery and equipment of Baosteel HeavyPlate Mill CPL is very advanced, but because it is the world's first set, thelack of experience in the use made the deficiencies of system graduallyexposed after being put into operation.Leveler roller position adjustment for CPL is not in place and levelerroller drive torque distribution is unreasonable.This thesis presents someoptimization measures to meet the high-precision, high-performancestraightening process requirements.The thesis first defines two important directions of the axes of acoordinate system about the position of leveler rolls: Z directionperpendicular to the plate surface and X direction parallel to the platesurface. The leveler position adjustment uses the electro-hydraulic controlsystem, and the PID controller shows satisfactory performance when theenvironment fluctuations are small. When the environment fluctuationsare not small,the performance of the PID controller is not satisfactory.Based on the mathematical model of the electro-hydraulic control system,this thesis presents one improved PID control and fuzzy PID controller.The experiment simulation shows that the improved PID control iseffective and the performance of the fuzzy PID control is superior to theconventional PID control, the fuzzy PID controller can be adapted in thecomplex field environment.The uneven load distribution in leveler often results in a broken shaftoff the roller accident. Based on the research of the load distributionabout CPL X position control, this thesis proposes a load distributionmethod, which effectivelyavoids the uneven load distribution.