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A Method for Improving Rolling Stability of Continuous Cold Rolling Process Through Thickness Monitoring

A stable, continuous cold rolling technology, applied in metal rolling, metal rolling, rolling mill control devices, etc., can solve problems such as rolling stability problems, improve production efficiency and yield, reduce rolling The effect of controlling instability and broad application prospects

Active Publication Date: 2020-07-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patent provides a method and device for measuring the thickness of a continuous rolling mill, that is, the AGC thickness control method commonly used in the industry at present. system stability issues

Method used

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  • A Method for Improving Rolling Stability of Continuous Cold Rolling Process Through Thickness Monitoring
  • A Method for Improving Rolling Stability of Continuous Cold Rolling Process Through Thickness Monitoring
  • A Method for Improving Rolling Stability of Continuous Cold Rolling Process Through Thickness Monitoring

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: A method for improving the rolling stability of the cold tandem rolling process through thickness monitoring:

[0037] The data of the inlet thickness gauge and the outlet thickness gauge are transmitted to the rolling mill through the original AGC system for normal thickness feedback control (the value of δ1 corresponds to h i with h i-1 The difference threshold is 3.75%, corresponding to h i with h i-2 The difference threshold δ2 is 5%, corresponding to h i with h i-5 The difference threshold δ3 is 7.5%, the deceleration interval constant α takes a value of 50%, and the time interval constant β takes a value of 20ms).

[0038] While performing normal AGC control, a rolling mill stability monitoring system is added to the process machine system. For the thickness data measured by the entrance thickness gauge, the current measured thickness value is marked as h6 (the target thickness value of hot-rolled coil H 入口 ), when the following situations occur...

Embodiment 2

[0039] Embodiment 2: A calibration method of a rolling mill thickness control system is as follows:

[0040] The data of the entrance thickness gauge and the exit thickness gauge are transmitted to the rolling mill through the original AGC system for normal thickness feedback control (the value of δ4 corresponds to H j with H j-5 The difference threshold is 3%, corresponding to H j with H j-10 The difference threshold δ5 is 5%, the deceleration interval constant α takes a value of 50%, and the time interval constant β takes a value of 20ms).

[0041] While performing normal AGC control, mark the current measured thickness value as H for the thickness data measured by the exit thickness gauge j (Export target thickness value H 出口 ), when the following situations occur, the stability monitoring system takes effect: (1) set H j and the penultimate measuring point H j-5 For comparison, H j with H j-5 The difference is 0, less than 3%H 出口 and greater than -3%H 出口 , then t...

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Abstract

The invention provides a method for improving rolling stability of the cold continuous rolling process through thickness monitoring, and relates to the technical field of metallurgy / acid pickling rolling. For related material characters and rolling characters of the non-oriented silicon steel product high grade series, a method for achieving the stable cold continuous rolling process of non-oriented high grade silicon steel through a thickness monitoring system is provided. The phenomenon of unstable rolling due to incoming material thickness fluctuation or thickness fluctuation in the rollingprocess is reduced, normal and stable production of non-oriented silicon steel high grade products with the silicon content level being 1.8%-3.2% is achieved, and the production efficiency and the yield level of the non-oriented high grade silicon steel products are obviously improved; and popularization can be achieved for other cold continuous rolling machines and single-rack rolling machines,and wide application prospects are achieved.

Description

technical field [0001] The invention relates to the field of metallurgical technology / pickling and rolling technology, in particular to a method for improving rolling stability in a continuous cold rolling process through thickness monitoring. Background technique [0002] In recent years, with the rapid development of the household appliance industry and the motor industry, the demand for silicon steel products is also increasing, and cold-rolled non-oriented silicon steel products are more and more popular in the market due to their high magnetic induction and low iron loss. It has replaced hot-rolled silicon steel sheets as the main raw material for the motor industry. Cold-rolled non-oriented low-grade silicon steel products are generally rolled by continuous rolling mills at present, while non-oriented high-grade silicon steel products are extremely brittle due to their material properties, resulting in poor rolling stability, and prone to strip breakage and stacked ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/00B21B37/20B21B38/00B21B1/28
CPCB21B1/28B21B37/00B21B37/165B21B37/20B21B38/00B21B2038/004
Inventor 李红梅曾建峰周毅卢勇高时庄
Owner BAOSHAN IRON & STEEL CO LTD