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Method for controlling load balance of rolling mill for cold rolled steel strip driven by dual electrical motors

A technology of load balancing and control methods, applied in rolling mill control devices, metal rolling, roll speed control, etc.

Inactive Publication Date: 2007-12-26
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems existing in the existing dual-motor drive cold rolling mill production technology, the present invention proposes a comprehensive control method, that is, a control method for the rolling load balance of the dual-motor drive cold-rolling strip mill, which can control the up and down during the rolling process. The speed difference of the work rolls is controlled within a small range, so as to ensure the stability of the rolling process, avoid surface defects of the strip, and not affect the normal production process of the rolling mill

Method used

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  • Method for controlling load balance of rolling mill for cold rolled steel strip driven by dual electrical motors
  • Method for controlling load balance of rolling mill for cold rolled steel strip driven by dual electrical motors

Examples

Experimental program
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Embodiment 1

[0060] The original initial roughness of the upper and lower work rolls are 0.91μm and 0.95μm respectively. The total amount of strip rolled by the work rolls during strip rolling is 1524 tons. The strip rolled steel is st12, the entrance thickness is 2.19mm, the reduction rate r is 20%, and the strip width is 1250mm. During the rolling process, the unit tension σ at the exit of the rolling mill is 120Mpa, and the acceleration of the motor during the acceleration process is 1m / s 2 .

[0061] The concentration of the emulsion is 3.25%, the temperature is 57°C, the pH value is 6.1, the electrical conductivity is 101μs / cm, the saponification value is 170mg KOH / g, the E.S.I is 51%, the injection pressure is 9.1Bar, and the work roll emulsion injection flow rate is 5140l / min .

[0062] Under the conditions of the above process parameters, the actual values ​​of the torque and speed of the upper and lower roll drive motors during the strip rolling process are shown in Figure 2. ...

Embodiment 2

[0064] The original initial roughness of the upper and lower work rolls are respectively: 0.98μm and 0.94μm. The total amount of strip steel rolled by the work rolls during strip rolling is 2422 tons. The strip rolled steel is spcc, the entrance thickness is 2.17mm, and the strip width is 1220mm. The initial reduction rate r set by the computer is 18%, and the revised reduction rate is 0.9×18%. The unit tension σ at the exit of the rolling mill initially set by the computer is 125Mpa, the unit tension at the exit after correction is 1.15×125Mpa, and the motor acceleration is initially set at 1m / s 2, the corrected acceleration is 0.8m / s 2 .

[0065] The concentration of the emulsion is 3.5%, the temperature is 58°C, the PH value is 6.4, the conductivity is 106μs / cm, the saponification value is 173mg KOH / g, the E.S.I is 55%, the injection pressure is 9.7Bar, and the work roll emulsion injection flow rate is 5410l / min .

[0066] Under the conditions of the above process para...

Embodiment 3

[0068] The original initial roughness of the upper and lower work rolls: 1.04μm, 1.14μm. The total amount of strip rolled by the work rolls during strip rolling is 3104 tons. The strip rolled steel is st12, the entrance thickness is 1.15mm, and the strip width is 1225mm. The initial reduction rate r set by the computer is 33%, and the revised reduction rate is 0.7×33%. The unit tension σ at the exit of the rolling mill initially set by the computer is 125Mpa, after correction, the unit tension at the exit is 1.4×125Mpa, and the initial motor acceleration is set at 1m / s 2 , the corrected acceleration is 0.6m / s 2 .

[0069] The concentration of the emulsion is 3.5%, the temperature is 59°C, the pH value is 7.2, the electrical conductivity is 103μs / cm, the saponification value is 170mg KOH / g, the E.S.I is 51%, the injection pressure is 9.3Bar, and the work roll emulsion injection flow rate is 5141l / min .

[0070] Under the conditions of the above process parameters, the actu...

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Abstract

The invention discloses a control method for load balance of cold-strip steel rolling mill of double motor drive. The feature is that it is realized by control the technical parameter of roller, technical parameter of emulsion, dynamically adjusting rolling unit tension, percent of reduction and acceleration of raising speed of driving motor. The invention could compensate the work roller friction by the control parameters of percent of reduction, unit tension and acceleration of driving motor according to the actual parameter of rolling strip steel. The method could improve the stability during rolling process and control the motor speed difference caused by load difference by 3%.

Description

technical field [0001] The invention belongs to the field of steel rolling, and is suitable for the production process control of a cold-rolled strip mill driven by double motors, in particular to a control method for rolling load balance of a cold-rolled strip mill driven by double motors. technical background [0002] In the cold rolling production process of strip steel, due to the difference in the rolling process parameters of the upper and lower rolls, the rolling state in the rolling deformation zone of the upper and lower rolls will be different. Due to the different rolling states of the upper and lower work rolls, there are differences in rolling loads such as rolling forces and rolling moments of the upper and lower work rolls. [0003] For the cold rolling mill control system driven by dual motors, the load balance control function of the two motors for the upper and lower rolls is provided. The purpose of this motor load balance control is to ensure that the cu...

Claims

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Application Information

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IPC IPC(8): B21B37/00B21B37/48B21B37/56B21B37/46
Inventor 王义栋蔡恒君杨忠杰高毅王军生张瑞龙王越唐伟宋蕾
Owner ANGANG STEEL CO LTD
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