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A composite control method for elongation of pickling on-line tempering machine

A composite control and skin-pass mill technology, which is applied in the control field of metallurgical production lines, can solve the problems of inability to achieve the elongation control target, excessive elongation fluctuations, etc., and achieve the effects of stable operation elongation control and constant elongation control.

Active Publication Date: 2019-06-07
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The content of the present invention is different from the above-mentioned patents. The present invention is aimed at the "thin and soft" characteristics of the pickling on-line tempering machine object, and it is very easy for the elongation rate to fluctuate too much or the elongation rate control target cannot be reached.

Method used

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  • A composite control method for elongation of pickling on-line tempering machine
  • A composite control method for elongation of pickling on-line tempering machine
  • A composite control method for elongation of pickling on-line tempering machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Example 1: Implementation of composite control of elongation of pickling on-line tempering machine

[0103] (1) Set the tension distribution of the process section of the pickling online tempering machine. The speed of the main roller of the tension roller in front of the tempering machine is used as the speed reference of the process section of the online tempering machine. Establish tension in the exit section of the temper mill.

[0104] (2) Because the surface of the hot-rolled sheet is loose after pickling, the roughness of the sheet surface is large. The traditional way of controlling elongation by rolling force cannot solve the problem of stable elongation control of "thin and soft" strip steel. For this reason, combined with the form of online tempering mill process equipment, a combination of pressing system and main drive motor of the tempering mill is designed. Control the elongation method of the online tempering machine to achieve the control target of the...

Embodiment 2

[0109] Example 2: Actual verification and result analysis

[0110] The contract guarantee value of the elongation rate of a steel company's pickling on-line tempering machine is ±0.15% under the constant speed state, and the contract guarantee value is ±0.2% under the acceleration and deceleration state. A practical test was carried out by the compound control method of elongation of the present invention.

[0111] From Figure 5It can be seen from the data curve in and the data in Table 1 that the composite elongation control method of the present invention has higher control accuracy, which shows that the composite elongation control method is very effective and successful. When the elongation rate target value is 0.6%, the actual elongation rate fluctuates between -0.04% to +0.04% in the constant speed stage and between -0.14% to +0.112% in the acceleration stage through compound control of elongation rate, reaching Guaranteed value requirements. X1 and X2 in Table 1 rep...

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Abstract

The present invention provides a compound elongation control method for pickling on-line tempering machine, comprising the following steps: step 1: setting tension distribution in the process section of the on-line tempering machine, step 2: calculating the rolling force correction amount of the tempering machine pressing system, and Three: Calculation of the tension correction amount at the entrance of the tempering machine, step four: closed-loop control of the composite control elongation rate of the main drive of the online tempering machine and the pressing system. The invention proposes a compound control method for the elongation rate of the pickling on-line tempering machine, combined with the characteristics of the tension distribution of the pickling on-line tempering machine, according to the elongation change, speed change, tension change, etc., the entrance tension correction amount and rolling The amount of braking force correction is to adjust the main transmission speed of the temper mill and the opening of the servo valve of the pressing system, and finally realize the stable operation of the unit and the constant elongation control.

Description

technical field [0001] The invention relates to a compound elongation control method of an pickling on-line tempering machine, which belongs to the control field of metallurgical production lines. Background technique [0002] Pickling hot-rolled flat coils are high-quality hot-rolled coils as raw materials. On the pickling unit, the iron oxide scale on the surface of the strip is removed, and the hot-rolled pickled coils are obtained after the skinning process. Pickling hot-rolled flat coil is a new type of product in the development of plate and strip production. It has excellent cold formability, surface flatness and smoothness. It is an intermediate product between hot-rolled and cold-rolled plates. It is a plate and strip product that is directly applied to the needs of various industries in the country's economic construction. It has a surface flatness and smoothness close to that of cold-rolled products, and its price is lower than that of cold-rolled products. It is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D1/05
CPCB21D1/05
Inventor 赵云涛叶立刚李维刚
Owner WUHAN UNIV OF SCI & TECH