Feed forward control method for wall thickness of tension reducing machine

A technology of stretching and reducing machine and pipe wall, which is applied in the fields of rolling mill control device, metal rolling, manufacturing tools, etc., can solve the problems of deterioration, untimely adjustment and poor effect.

Active Publication Date: 2007-01-03
BAOSHAN IRON & STEEL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the case of fast-paced production, this adjustment method is very ineff

Method used

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  • Feed forward control method for wall thickness of tension reducing machine
  • Feed forward control method for wall thickness of tension reducing machine
  • Feed forward control method for wall thickness of tension reducing machine

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Experimental program
Comparison scheme
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Embodiment Construction

[0026] The following pass Figure 1 ~ Figure 3 , to better illustrate specific embodiments of the present invention.

[0027] Firstly, the tension-reduction process of a typical BRDBY steel pipe is selected to carry out the production test of wall thickness feed-forward adaptive control. The pipe wall thickness is 5.51mm, 18 participating rolling stands, and 12 rotating speed fixed stands;

[0028] Since the tension lowering stand is a finishing stand, its main function in rolling is to adjust the roundness of the steel pipe, therefore, for the average wall thickness control and pipe end thickening control, only the tension raising stand and the working stand are allowed Participate in steady-state speed adjustment and dynamic speed adjustment.

[0029]

Number of steel pipes

The actual wall thickness of waste pipe

(mm)

Average wall thickness of finished pipe

(mm)

1

6.142

5.510

2

5.993

5.497 ...

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Abstract

The feed forward control method for wall thickness of tension reducing machine includes the following steps: 1. reading out the ideal correlated technological parameter data of the steel pipe to be rolled and on-line measuring its practical correlated technological parameter data; 2. real-time on-line calculating the wall thickness of continuously rolled pipe and calculating the error; 3. regulating the roller rotation speed based on the expression I for reaching ideal thickness in the case of the error within the required range; and 4. calculating the roller rotation speed correcting amount based on expression II before returning to the step 3 in the case of the error beyond the required range. The present invention utilizes the on-line data of hot rolling process in regulating the rolling rotation speed distribution of rollers adaptively to raise the rolled pipe product wall thickness precision.

Description

technical field [0001] The invention relates to a feedforward control method for wall thickness of a seamless steel pipe stretching and reducing machine, in particular to a feedforward adaptive control method for wall thickness of a seamless steel pipe stretching and reducing process based on the deviation of the wall thickness of an incoming raw material. Background technique [0002] At present, most of the bars in the hot rolling process of seamless steel pipes are cut by flame, and the deviation of incoming materials for tube blanks is relatively large. If the continuous rolling mill adopts full-floating mandrel rolling, its process conditions determine the tension and subtraction of incoming materials, that is, the wall thickness deviation of the continuous rolling barren tube is large, which is mainly reflected in the large difference in wall thickness of adjacent steel tubes. At present, in the stretching and reducing machine process, the production operator manually ...

Claims

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Application Information

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IPC IPC(8): B21B37/78B21B37/18
Inventor 薛建国郑坚敏刘山
Owner BAOSHAN IRON & STEEL CO LTD
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