Load distribution method improving rolling stability of hot-rolled thin strip

A technology of load distribution and stability, applied in the direction of metal rolling, metal rolling, metal rolling racks, etc., can solve problems such as economic losses, affecting rolling stability, fluctuations, etc., to improve stability and avoid large-scale Fluctuation and the effect of reducing rolling accidents

Active Publication Date: 2017-01-11
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] When rolling hot-rolled thin strips, due to fluctuations in the temperature at the entrance of the finish rolling, the load of the rolling mill fluctuates greatly, and steel stacking accidents and tailing accidents frequently occur during production, which greatly affects the stability of rolling and reduces production operations. rate and success rate, resulting in huge economic losses for the company

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The present invention improves the load distribution method of hot strip rolling stability and comprises the following steps:

[0041] Step S1: When rolling the first strip of hot-rolled thin strip SPA-H 1.55mm, distribute it according to the general load distribution method; In the secondary control system, the reduction rates of F1, F2, and F7 rolling mills are respectively 50%, 52%, and 10%.

[0042] Step S2: Correcting the rolling force ratio of the F3-F6 rolling mill so that the reduction rate of the F3-F6 rolling mill remains relatively stable. The reduction rate of the F3 mill is 40% (1+ / -5%), the reduction rate of the F4 mill is 32% (1+ / -5%), and the reduction rate of the F5 mill is 26% (1+ / - 5%), the reduction rate of the F6 mill was 21% (1+ / -5%).

[0043] The reduction rate of the above-mentioned F3 rolling mill is 40% (1+ / -5%) refers to the value range of the reduction rate, that is, the range of the reduction rate of the F3 rolling mill is 40% (1-5%) ~ 40 ...

Embodiment 2

[0046] The present invention improves the load distribution method of hot strip rolling stability and comprises the following steps:

[0047]Step S1: When rolling the first piece of hot-rolled thin strip SDC031.58mm, distribute it according to the general load distribution method; In the control system, the reduction ratios of F1, F2, and F7 rolling mills are respectively 47%, 49%, and 15%.

[0048] Step S2: Correcting the rolling force ratio of the F3-F6 rolling mill so that the reduction rate of the F3-F6 rolling mill remains relatively stable. The reduction ratio of F3 mill is 41% (1+ / -5%), the reduction ratio of F4 mill is 35% (1+ / -5%), and the reduction ratio of F5 mill is 28% (1+ / - 5%), the reduction ratio of F6 mill is 23% (1+ / -5%).

[0049] The reduction rate of the above-mentioned F3 rolling mill is 41% (1+ / -5%) refers to the value range of the reduction rate, that is, the range of the reduction rate of the F3 rolling mill is 41% (1-5%) ~ 41 %(1+5%), where 41%(1-5%...

Embodiment 3

[0052] The present invention improves the load distribution method of hot strip rolling stability and comprises the following steps:

[0053] Step S1: When rolling the first piece of hot-rolled thin strip SAE10052.0mm, distribute it according to the general load distribution method; In the control system, the reduction ratios of F1, F2, and F7 rolling mills are respectively 46%, 48%, and 13%.

[0054] Step S2: Correcting the rolling force ratio of the F3-F6 rolling mill so that the reduction rate of the F3-F6 rolling mill remains relatively stable. The reduction ratio of F3 mill is 41% (1+ / -5%), the reduction ratio of F4 mill is 34% (1+ / -5%), and the reduction ratio of F5 mill is 25% (1+ / - 5%), the reduction rate of F6 mill is 22% (1+ / -5%).

[0055] The reduction rate of the above-mentioned F3 rolling mill is 41% (1+ / -5%) refers to the value range of the reduction rate, that is, the range of the reduction rate of the F3 rolling mill is 41% (1-5%) ~ 41 %(1+5%), where 41%(1-5...

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Abstract

The invention provides a load distribution method improving rolling stability of a hot-rolled thin strip, relates to a control method suitable for rolling the hot-rolled thin strip and aims at providing the load distribution method improving the rolling stability of the hot-rolled thin strip. By means of the method, wide-range fluctuation of the load of a rolling mill caused by temperature fluctuation of a finish rolling inlet can be avoided, the rolling accidents are obviously reduced, and the rolling stability is greatly improved. The load distribution method improving the rolling stability of the hot-rolled thin strip includes the following steps that when the hot-rolled thin strip is rolled and a first piece of thin strip steel is rolled, distribution is performed according to a universal load distribution method; and when a second piece of strip steel and later same-steel-grade and same-specification strip steel are rolled, the downward-pressing rates of an F1 rolling mill, an F2 rolling mill and an F7 rolling mill are immobilized, the rolling force rates of rolling mills ranging from F3 to F6 are corrected, and the downward-pressing rates of the rolling mills ranging from F3 to F6 are made to be kept relatively stabilized.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a control method suitable for hot strip rolling. Background technique [0002] In the metallurgical industry, the hot-rolled sheet process generally includes a finishing mill, which is the most critical equipment and affects various control indicators of the finished product. The finishing mill generally includes work rolls, backup rolls, roll adjustment devices, guide devices, loopers, etc. [0003] The principle of distributing the reduction of each stand in the hot continuous rolling mill is: generally, it is to make full use of the favorable conditions of high temperature, and concentrate the reduction in the first few rolling mills as much as possible. For thin-gauge products, in order to ensure the plate shape, thickness accuracy and surface quality in the last few rolling mills, the reduction is gradually reduced. The specific distribution is as follows: [0004] (1) Consideri...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B21B37/58B21B1/38
CPCB21B1/38B21B37/58B21B2001/386B21B2201/06B21B2265/12B21B2271/02
Inventor荣彦明陈永平
OwnerSHOUGANG JINGTANG IRON & STEEL CO LTD