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Dynamic control method for loop lifting angle of finishing mill

A technology of dynamic control and finishing mill, applied in metal rolling, metal rolling, tension/pressure control, etc. Improved rolling stability and reduced scrap

Pending Publication Date: 2022-05-13
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiencies described in the background technology section, and solve technical problems such as rolling instability and plate shape defects caused by the mismatch of second flow rates between stands. The dynamic control method dynamically adjusts the angle of the looper through the method of self-adaptive speed, so as to improve the stability of the angle of the looper and the stability of the strip when the strip steel bites the steel, and achieves the purpose of stable rolling.

Method used

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  • Dynamic control method for loop lifting angle of finishing mill
  • Dynamic control method for loop lifting angle of finishing mill
  • Dynamic control method for loop lifting angle of finishing mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] In Example 1, plain carbon steel Q195-W was produced, with a target thickness of 2.75 mm and a target width of 1235 mm.

[0119] This piece of steel is the first piece of steel in this batch. The steel coil number is 919059401. The rough rolling exit thickness is 42.709mm, the finish rolling entrance width is 1270.03mm, the rough rolling exit temperature is 1085.2°C, and the finish rolling target temperature is 880°C. The specific composition ( wt.%) is as follows: C: 0.04%, Si: 0.0159%, Mn: 0.2214%, P: 0.007%, S: 0.0132%, Al: 0.000%, Cr: 0.0209%, Ni: 0.0095%, Cu: 0.016% , Mo: 0.0067%, Ti: 0.0010%, V: 0.0017%, Nb: 0.0010%, N: 0.0032%, B: 0%.

[0120] The speed adaptation method of each rack is calculated according to the following steps:

[0121] (1) The exit thickness of rough rolling is 42.709mm, and the reduction rate (%) of each stand F0-F6 of finish rolling is 46.7%, 47.5%, 35.9%, 26.2%, 25.5%, 21.4%, 16.0%. According to formula (4), the outlet thickness (mm) of ...

Embodiment 2

[0175] In Example 2, plain carbon steel Q195-W was produced, with a target thickness of 2.75 mm and a target width of 1235 mm.

[0176] This piece of steel is the second piece of steel in this batch. The coil number is 919059402. The rough rolling exit thickness is 42.707mm, the finish rolling entrance width is 1271.83mm, the rough rolling exit temperature is 1082.5°C, and the finish rolling target temperature is 880°C. The specific composition ( wt.%) is as follows: C: 0.04%, Si: 0.0159%, Mn: 0.2214%, P: 0.007%, S: 0.0132%, Al: 0.000%, Cr: 0.0209%, Ni: 0.0095%, Cu: 0.016% , Mo: 0.0067%, Ti: 0.0010%, V: 0.0017%, Nb: 0.0010%, N: 0.0032%, B: 0%.

[0177] The speed adaptation method of each rack is calculated according to the following steps:

[0178] (1) The exit thickness of rough rolling is 42.707mm, and the reduction rate (%) of each stand F0-F6 of finish rolling is 44.6%, 46.6%, 36.9%, 26.7%, 27.6%, 21.8%, 15.8%. According to formula (4), the outlet thickness (mm) of each ...

Embodiment 3

[0232] In Example 3, common carbon steel DV19A was produced, with a target thickness of 2.45 mm and a target width of 1250 mm.

[0233] This piece of steel is a new steel type, the first piece of steel in this batch, the coil number is 919412801, the rough rolling exit thickness is 40.779mm, the finish rolling entrance width is 1286.04mm, the rough rolling exit temperature is 944.0°C, and the finish rolling target temperature is 830°C. Its specific composition (wt.%) is as follows: C: 0.0029%, Si: 3.0921%, Mn: 0.3138%, P: 0.009%, S: 0.0015%, Al: 0.231%, Cr: 0.0136%, Ni: 0.0047%, Cu: 0.0056%, Mo: 0.0107%, Ti: 0.0022%, V: 0.0022%, Nb: 0.0021%, N: 0.0017%, B: 0%.

[0234] The speed adaptation method of each rack is calculated according to the following steps:

[0235] (1) The exit thickness of rough rolling is 40.779mm, and the reduction rate (%) of each stand F0-F6 of finish rolling is 55.0%, 47.5%, 38.0%, 28.7%, 22.8%, 16.8%, 9.5%. According to formula (4), the outlet thickne...

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Abstract

A dynamic control method for a loop rising angle of a finishing mill belongs to the technical field of hot continuous rolling, solves the technical problems of rolling instability, plate shape defects and the like caused by mismatching of second flow between racks, and comprises the following steps: S1, respectively determining speed correction coefficients kvuk (i) according to long genetic conditions and short genetic conditions; s2, speed correction between the racks is carried out; and S3, the speed correction coefficient kvuk1 (i) of the rolled steel billet is determined. According to the dynamic control method for the loop rising angle of the finishing mill, the accuracy of speed calculation is obviously improved, the loop angle is dynamically adjusted, the method plays a very key role in rolling stability, plate shape control and the like, and the on-site waste rate is greatly reduced. And particularly, the method plays a key role in the rolling stability of high-hardness, high-strength and thin-specification varieties, promotes the thinning of various specifications, and has wide popularization and application values.

Description

technical field [0001] The invention belongs to the technical field of hot continuous rolling, and in particular relates to a method for dynamically controlling the angle of opening of a looper of a finishing mill. Background technique [0002] The main production process of the hot continuous rolling production line is: firstly, the slab is heated in the heating furnace according to the temperature specified by the process; secondly, after being heated to the target temperature, it enters the rough rolling mill for rolling, in which the vertical roll of the rough rolling controls the width, and the flat roll controls the width. Thickness, after the rolling of the rough rolling unit, the strip steel reaches the preset target thickness, width and temperature; again, it enters the finishing rolling unit for seven-stand continuous rolling, so that the strip steel reaches the preset target Thickness, temperature; finally, the strip is formed into coils by a coiler. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/50B21B41/00
CPCB21B37/50B21B41/00
Inventor 邱华东和雷利陈欣
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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