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A Method for Controlling Strip Threading Stability of Hot Rolling Laminar Cooling Zone

A laminar flow cooling and stability technology, applied in temperature control, workpiece cooling devices, manufacturing tools, etc., can solve problems such as folding, head floating, and insertion into roller tables

Active Publication Date: 2021-10-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for controlling the strip threading stability of the hot-rolled laminar cooling zone. The present invention can ensure the smooth and stable threading of the strip in the laminar cooling zone. For soft strip steel, sometimes it is difficult for the head of the strip to successfully complete the "threading" action in the laminar flow cooling area, and abnormal conditions such as the head floating, folding, and insertion into the roller table occur, resulting in the strip head being unable to enter the coiling The problem of scrap steel downtime caused by machine

Method used

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  • A Method for Controlling Strip Threading Stability of Hot Rolling Laminar Cooling Zone
  • A Method for Controlling Strip Threading Stability of Hot Rolling Laminar Cooling Zone
  • A Method for Controlling Strip Threading Stability of Hot Rolling Laminar Cooling Zone

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Embodiment 1

[0046] Assuming that there are 12 cooling sections in the main cooling zone of a certain production line, namely BANK1-BANK12, and each cooling section includes 6 cooling headers at the top and bottom respectively. In this embodiment, BANK1-BANK3 are set as the initial cooling sections. Strip steel incoming material: steel type: AP1056E1; target thickness: 1.81mm; strip threading speed: 11.6m / s, according to the incoming material situation, by querying the strip threading control parameter table, the strip steel needs to be controlled for strip threading stability. In this embodiment, 0 indicates that the cooling header is off, and 1 indicates that the cooling header is on.

[0047] The threading control parameter table that present embodiment establishes is as follows:

[0048]

[0049]

[0050] Among them, the hardness group is divided as follows:

[0051] steel type Hardness group AP1056E1 1 AQ1060H5 1 … …

[0052] The division of thic...

Embodiment 2

[0067] Assuming that there are 12 cooling sections in the main cooling zone of a certain production line, namely BANK1-BANK12, and each cooling section includes 6 cooling headers at the top and bottom respectively. In this embodiment, BANK1-BANK3 are set as the initial cooling sections. Strip steel incoming material: steel type: AQ1060H5; target thickness: 2.21mm; strip threading speed: 10.8m / s, according to the incoming material situation, by querying the strip threading control parameter table, the strip steel needs to be controlled for strip threading stability. In this embodiment, use 0 to indicate that the cooling header is closed, and use 1 to indicate that the cooling header is on. The specific control process is as follows:

[0068] (1) In the initial cooling section, B A N K1 is not opened, and BANK2~BANK3 are opened asymmetrically and sparsely.

[0069] The states of the upper cooling headers of BANK1~BANK3 are controlled as follows: BANK1: 0 0 0 0 0 0, BANK2: 1 0 1...

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Abstract

The invention relates to a method for controlling the strip threading stability of a hot-rolled laminar flow cooling zone, which specifically includes: (1) in the initial cooling section, adopt continuous cooling for the upper cooling header and the lower cooling header of each group of cooling headers. Open up and down alternately; (2) After entering the normal cooling zone, the upper cooling header and the lower cooling header are opened symmetrically, and the number of openings gradually increases, and a gradual water spray is performed from sparse to dense; (3) The exit of the laminar cooling zone Delayed opening control of vertical sprinklers. The invention can ensure the smooth threading of the strip steel in the laminar flow cooling zone, and solve the problem that the head of the thinner and soft strip steel sometimes cannot successfully complete the "threading" action in the laminar flow cooling zone, and the head appears Abnormal conditions such as floating, folding, and insertion into the roller table will cause the head of the strip to fail to enter the coiler and cause scrap steel shutdown accidents.

Description

technical field [0001] The invention relates to the field of automatic control of the production process of hot-rolled strip steel, in particular to a method for controlling the strip-threading stability of the hot-rolled laminar flow cooling zone. Background technique [0002] After the strip head is rolled by the finish rolling stand, the "strip threading" in the finish rolling area is completed (smoothly pass through the finish rolling stand according to the set process parameters), and the strip head then enters the layer In the flow cooling area, while being rapidly cooled by the water sprayed from the upper and lower cooling headers of laminar flow cooling, it moves at high speed to the coiler tens of meters or even more than 100 meters away. From this moment until the strip head is successfully coiled on the coiler is the "threading" process of the strip in the laminar cooling zone. [0003] In this process, since the steel strip head has no traction material and nee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/74B21B45/02
CPCB21B37/74B21B45/0233
Inventor 张智勇
Owner BAOSHAN IRON & STEEL CO LTD
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