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Pickling and rolling mill load distribution method

A load distribution and rolling mill technology, applied in the direction of metal rolling, metal rolling, rolling force/roll gap control, etc., can solve problems such as easy occurrence of lace, large influence of exit shape, bad shape sealing rate, etc. Achieve stable rolling and improve the composition rate of acid rolling mill

Active Publication Date: 2013-10-30
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a technical solution aiming at the high intensity of manual intervention in the load distribution mode in the prior art, which has a great influence on the shape of the outlet plate, resulting in a high sealing rate of poor plate shape, and prone to quality problems such as lace and edge waves.

Method used

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  • Pickling and rolling mill load distribution method
  • Pickling and rolling mill load distribution method
  • Pickling and rolling mill load distribution method

Examples

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Effect test

Embodiment 1

[0030] Example 1: figure 2 It is the load distribution result of 100 rolls of T4 material, the entrance is 2.0mm, the width is 800-900mm, and the exit thickness is 0.201mm. sr1-sr5 is the load of 1-5 racks.

[0031] The invention has been applied in the automatic control of Meishan Steel's 1420 five-stand six-roller UCM acid rolling mill, and can also be applied to other types of rolling mills on the basis of adjusting the reduction ratio coefficient.

[0032] Table 1 Equipment parameters of Meishan Iron and Steel 1420 acid rolling mill

[0033] serial number device name parameter 1 Work roll size mm φ435 / φ385X1420 2 Intermediate roll size mm φ490 / φ440X1400 3 Support roller size mm φ1300 / φ1150×1420 4 Motor power kw 4600 5 Motor speed rpm 400 / 1200 6 Roll shifting amount of intermediate roll mm 0 / 380 7 Work roll bending kn -180 / 400 8 Intermediate roll bending kn 10 / 500

[0034] In pickling production,...

Embodiment 2

[0058] Example 2: image 3 It is the load distribution result of 100 rolls of T5 material, the entrance is 2.0mm, the width is 800-900mm, and the exit thickness is 0.183mm. sr1-sr5 is the load of 1-5 racks.

[0059] Table 5 T5 Material 1-5 Frame Reduction Ratio Coefficient

[0060]

[0061] Taking T5 material, specifications: the inlet thickness is 2.0mm, the outlet thickness is 0.183mm, and the width is 836mm for illustration. The calculation steps are as follows:

[0062] The first step is to determine the entrance thickness 2.0 and exit thickness 0.183 of the continuous rolling mill with n stands;

[0063] The second step is to calculate the average reduction rate

[0064] =0.38015;

[0065] The third step, according to the outlet width of strip steel 836mm, query Table 2, obtain the width grade as 2, according to the outlet thickness of strip steel 0.183mm, query Table 3, obtain the thickness grade as 3, obtain the width grade according to the previous, Thicknes...

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Abstract

The invention relates to a pickling and rolling mill load distribution method. The pickling and rolling mill load distribution method is characterized in that when the thickness of an outlet is more than 0.35mm, a roughed-roll rolling mode is adopted, when the thickness of the outlet is less than 0.35mm, a reduction rate distribution ratio mode is adopted, a reduction rate distribution ratio based mode is adopted, relative reduction ratios of one to five frames are adopted to substitute for original power balance coefficients of the one to five frames, the thickness of the outlets of the frames identical in specifications are not changed, loads of the frames identical in the specifications are ensured to be unchanged, a manual intervening rate is lowered from original 36.4% to current 2.1%, a thickness hit rate of + / -0.5% is increased by 2.4% as compared with the original, and the thickness hit rate of + / -1% is increased by 0.7% as compared with the original. By the aid of the pickling and rolling mill load distribution method, stable rolling in the process of pickling and rolling thin standard strip steel is realized, and yield of a pickling and rolling unit is increased.

Description

technical field [0001] The invention relates to the field of automatic control of tandem cold rolling mills. A reasonable load distribution method is adopted to ensure that the reduction amount of a rolling mill frame, that is, the load remains stable, and in particular relates to a load distribution method of an acid rolling mill. Background technique [0002] In the load distribution method in the prior art, the rolling force balance method is adopted between the 1-2 stands, and the power balance method is adopted for the 2-5 stands. Due to the influence of the friction coefficient or the self-adaptation of the rolling force, the load fluctuates greatly , especially before and after the 1# or 2# rack is changed separately, the load of the 1# rack exceeds 50% or is lower than 35%. According to the calculation result, it is impossible to roll steel at all, and only manual intervention is required. The labor intensity of the operator is high, and the load The manual intervent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/58B21B38/04
Inventor 汤红生郑向东曹德亮贾银芳冯蕊王宏学
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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