A method for detecting the consistency of the lateral bending trend of the intermediate billet during the rough rolling of hot-rolled strip

Abstract

The present invention relates to a method for detecting the consistency of the lateral bending trend of the intermediate billet in rough rolling of hot-rolled plates and strips, comprising: a secondary system analyzing and judging the lateral bending value of the head of the intermediate billet in rough rolling of each heating furnace, outputting the judgment result to the primary heating human-machine screen to display the difference furnace result, adjusting the difference furnace condition, and adjusting the trend of the lateral bending value of the head of the rough rolling intermediate billet to be consistent; the present invention statistically analyzes the lateral bending value of the head of the rough rolling intermediate billet through the secondary system, judges the lateral bending trend of the head of the intermediate billet after rough rolling of the steel billet in the heating furnace, and displays the lateral bending trend difference result on the heating terminal human-machine screen at the same time; the heating operator quickly adjusts the lateral bending trend difference furnace of the head of the intermediate billet according to the lateral bending trend difference result, ensures that the shape trend of the rough rolling intermediate billet of each heating furnace is consistent, improves the stability of the finishing rolling head strip threading, improves the rolling efficiency, and reduces the waste and defective products caused by the head folding and steel jamming, thereby improving the rolling line yield and product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of steel rolling technology, and in particular to a method for detecting the consistency of the lateral bending trend of a hot-rolled plate and strip rough-rolled intermediate billet. Background Art

[0002] After the hot-rolled strip billets are heated to the rolling temperature in the heating furnace, the heated billets are rolled through the roughing mill. Whether the head lateral bending trend of the roughing intermediate billet is consistent directly affects the stability of the strip passing through the finishing mill in the next process, especially for steel grades with high rolling hardness and small thickness. At present, a certain hot rolling production line has billets of different furnace numbers undergoing rough rolling. When the roll gap deviation value on both sides of the roughing mill remains unchanged, the head lateral bending of the roughing intermediate billet changes frequently, and the head lateral bending trend is inconsistent. As a result, the direction of the strip head changes during the finishing rolling process, resulting in accidents such as folding and steel jamming. The problem of inconsistent head lateral bending trend of the roughing intermediate billet can only be improved by timely adjusting the heating furnace conditions. However, the heating screen cannot display the lateral bending value of the roughing area. Therefore, the inconsistent lateral bending trend of the roughing is not adjusted in time, affecting the stability of the finishing rolling. Therefore, it is necessary to develop a method to present the consistency of the side bending trend of the intermediate billets of different furnace numbers during rough rolling on the human-machine screen of the heating furnace. This information can be used to adjust the furnace conditions in time to ensure that the shape trends of the intermediate billets of all the billets in the heating furnace are consistent after rough rolling, thereby improving the rolling stability. Summary of the Invention

[0003] The present invention provides a method for detecting the consistency of the lateral bending trend of the rough-rolled intermediate billet of hot-rolled plates and strips, thereby ensuring the consistency of the shape trend of the rough-rolled intermediate billet of each heating furnace billet, improving the stability of the finishing rolling head strip threading, and improving the rolling efficiency. At the same time, it reduces the waste and defective products caused by the head bending and steel jamming, and improves the rolling line yield and product quality.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for detecting the consistency of the lateral bending trend of a hot-rolled strip rough rolling intermediate billet comprises the following steps:

[0006] S1. The secondary system analyzes and determines the head camber value of the intermediate billet during rough rolling of each heating furnace;

[0007] S1.1. Slabs are circulated and tapped in order of heating furnace numbers. The corresponding rough rolling intermediate slab head camber values ​​are calculated to determine whether the cambers of the intermediate slabs of each furnace number are in the same direction.

[0008] S1.2. When the lateral curvature of the intermediate billets of each furnace number is in the same direction, and the absolute value of each lateral curvature value does not exceed 30 mm, it is determined that the material shape trend of the head of the rough-rolled intermediate billets rolled by all the heating furnaces is consistent. If the absolute value of each lateral curvature value is greater than 30 mm, it is determined that the material shape trend of the head of the rough-rolled intermediate billets rolled by all the heating furnaces is different, and the difference value is calculated;

[0009] S1.3. When the sides of the intermediate billets of each heat are in different directions, the number of positive and negative side bending values ​​shall be counted;

[0010] S1.4 When the number of positive camber values ​​is not less than the number of negative camber values, it is determined that the shape trend of the head of the intermediate billet after rough rolling of the heating furnace billet with negative camber values ​​is different, and the difference value corresponds to the camber value;

[0011] For positive camber values ​​greater than 30 mm, there is a difference in the shape trend of the head of the rough-rolled intermediate billet produced by heating furnace billet rolling, and the difference value is calculated;

[0012] S1.5. When the number of positive camber values ​​is less than the number of negative camber values, it is determined that there is a difference in the shape trend of the head of the intermediate billet after rough rolling of the heating furnace billet with positive camber values, and the difference is the corresponding camber value;

[0013] For negative camber values ​​greater than 30 mm, there is a difference in the shape trend of the head of the rough-rolled intermediate billet produced by heating furnace billet rolling, and the difference value is calculated.

[0014] S2. The judgment result is output to the first-level heating human-machine interface to display the difference furnace result;

[0015] S3. Adjust the furnace conditions of the differential furnace and adjust the head bending value trend of the rough rolling intermediate billet to be consistent.

[0016] Furthermore, in step S1.1, whether the side bending of the intermediate billets of each heat number is in the same direction is determined as follows: when the head side bending values ​​of the rough rolling intermediate billets of each heat number are all positive or negative, it is determined that the side bending of the intermediate billets of each heat number is in the same direction.

[0017] Furthermore, in step S1.2, the difference value is calculated as follows: difference value = absolute value of the head camber value of the rough rolling intermediate billet whose absolute value of the camber value is greater than 30 mm - 30 mm.

[0018] Furthermore, in step S1.4, the difference value is calculated as follows: difference value = the head camber value of the rough rolling intermediate billet which is a positive camber value and is greater than 30 mm - 30 mm.

[0019] Furthermore, in step S1.5, the difference value is calculated as follows: difference value = absolute value of the head camber value of the rough rolling intermediate billet which is a negative camber value and whose absolute value of the camber value is greater than 30 mm - 30 mm.

[0020] Furthermore, the determination result of step S2 includes the furnace number, difference direction, difference value, and difference direction.

[0021] Furthermore, the difference direction includes a bias towards the working side and a bias towards the transmission side. When the side bending value is a positive number, the head of the intermediate billet for rough rolling of the heating furnace billet is biased towards the working side. When the side bending value is a negative number, the head of the intermediate billet for rough rolling of the heating furnace billet is biased towards the transmission side.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The secondary system statistically analyzes the head camber value of the rough rolling intermediate billet to determine the head camber trend of the intermediate billet after rough rolling in the heating furnace. At the same time, the camber trend difference results are displayed on the heating terminal human-machine screen. The heating operator quickly adjusts the head camber trend difference furnace based on the camber trend difference results to ensure that the rough rolling intermediate billet shape trend of each heating furnace is consistent;

[0024] 2) It improves the stability of the shape trend of the rough rolling intermediate billet, reduces the problems of head side bending, large folding, and steel jamming caused by inconsistent material shape of the head of the rough rolling intermediate billet, ensures the stability of the head of the finished strip, improves the rolling efficiency of the rolling line, reduces waste and defective products caused by folding and steel jamming, improves the rolling line yield rate and product quality, and contributes to the development of intelligent and green production lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a flow chart of the method of the present invention.

[0026] Figure 2 The present invention provides a flow chart for judging the lateral bending tendency of the head of an intermediate billet during rough rolling of a steel billet in a heating furnace.

[0027] Figure 3 It is a schematic diagram of the intermediate billet side bending value curve of the present invention. DETAILED DESCRIPTION

[0028] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0029] See Figure 1 , is a flow chart of the method of the present invention. The present invention provides a method for detecting the consistency of the lateral bending trend of the intermediate billet of the hot-rolled strip rough rolling, comprising the following steps:

[0030] S1. The secondary system analyzes and determines the head camber value of the intermediate billet during rough rolling of each heating furnace billet;

[0031] See Figure 2-3, sort all the billets of the heating furnace by sequence number, statistically analyze the head bending value of the rough rolling intermediate billet, determine the head bending trend of the billet discharged from the heating furnace after rough rolling, set the heating furnace number as 1#, 2#, 3#...n#, and slabs are circulated in sequence according to the furnace number. Take the head bending value of the rough rolling intermediate billet of a circulating heating furnace sequence number as B1, B2, B3...Bn, and compare and analyze the head bending value of the rough rolling intermediate billet, where 1#, 2#, 3#...n# are the heating furnace numbers and B1, B2, B3...Bn are the head bending values ​​of the intermediate billet;

[0032] S1.1. Slabs are circulated and tapped in order of heating furnace numbers. The corresponding roughing intermediate billet head camber values ​​are calculated to determine whether the cambers of the intermediate billets of each furnace number are in the same direction. If the camber values ​​of the roughing intermediate billets of each furnace number are all positive or negative, the cambers of the intermediate billets of each furnace number are determined to be in the same direction.

[0033] S1.2. When the head camber values ​​B1, B2, B3...Bn of the rough rolling intermediate billet are all in the same direction:

[0034] (1) When the camber values ​​|B1|, |B2|, |B3|, ..., |Bn| are all ≤30 mm, the result is that the shape trend of the head of the rough rolling intermediate billet rolled by all the heating furnace billets is consistent;

[0035] (2) When the camber values ​​|B1|, |B2|, |B3|, ..., |Bn| are greater than 30 mm, it is determined that there is a difference in the material shape trend of the head of the rough rolling intermediate billet during the rolling of the billet in the heating furnace; that is, when the absolute value of the camber value of the head of the rough rolling intermediate billet is greater than 30 mm, there is a difference in the material shape trend of the head of the intermediate billet after rough rolling in the heating furnace, that is, when the absolute value of the camber value of the head of the rough rolling intermediate billet is greater than 30 mm, there is a difference in the material shape trend of the head of the intermediate billet after rough rolling in the heating furnace, and the difference is calculated:

[0036] Bcn=|Bn|-30mm (1)

[0037] S1.3. When the sides of the intermediate billets of each heat are in different directions, the number of positive and negative side bending values ​​shall be counted;

[0038] When the head camber values ​​B1, B2, B3, ..., Bn of the roughing intermediate billet are in different directions, that is, the head camber values ​​of the roughing intermediate billet are positive or negative, in this case, the head camber values ​​of the roughing intermediate billet are sorted from large to small, and the positive camber values ​​are grouped together, and the number of groups is Σbz; the negative camber values ​​are grouped together, and the number of groups is Σbf. The numbers of Σbz and Σbf are compared;

[0039] S1.4. When Σbz ≥ Σbf, the positive lateral bending value is used as the basis;

[0040] (1) The shape trend of the head of the intermediate billet after rough rolling of the heating furnace billet with negative lateral bending value is different, and the difference value is Bfn;

[0041] (2) The shapes of the heads of the intermediate billets of the heating furnace steel billets with positive camber values ​​after rough rolling are compared again. In Σbz, it is judged that the furnace numbers with camber values ​​of the heads of the intermediate billets greater than 30 mm have trend differences, and the difference value is Bzn.

[0042] Difference value Bzn=Bn-30mm(2)

[0043] S1.5. When Σbz<Σbf, the negative lateral bending value is used as the basis;

[0044] (1) The shape trend of the head of the intermediate billet after rough rolling of the heating furnace billet with positive camber value is different, and the difference value is Bzn;

[0045] (2) The shapes of the heads of the intermediate billets of the heating furnace steel billets with negative lateral curvature are compared again after rough rolling. In Σbf, it is judged that the furnace numbers with the absolute values ​​of the lateral curvature values ​​of the heads of the intermediate billets of rough rolling greater than 30 mm have trend differences, and the difference value is Bfn.

[0046] Difference value Bfn=|Bn|-30mm(3)

[0047] Among them, Σbz is the number of intermediate billet side bending values ​​in the positive array; Σbf is the number of intermediate billet side bending values ​​in the negative array.

[0048] S2, the secondary system outputs the judgment result to the primary heating human-machine interface and displays the difference furnace result;

[0049] The secondary system transmits the judgment result of inconsistent material shape trend of the head of the intermediate billet after rough rolling of the heating furnace steel billet to the human-machine screen of the corresponding heating furnace number, and it will not be displayed when the material shape trend of the head of the intermediate billet is consistent. The judgment result includes the furnace number, difference direction, difference value, and difference direction. The difference direction includes the working side and the transmission side. When the side bending value is positive, it corresponds to the working side of the head of the intermediate billet after rough rolling of the heating furnace steel billet. When the side bending value is negative, it corresponds to the transmission side of the head of the intermediate billet after rough rolling of the heating furnace steel billet.

[0050] S3. The heating operator quickly adjusts the differential furnace conditions based on the judgment results displayed on the heating furnace human-machine interface, and adjusts the trend of the head lateral bending value of the rough rolling intermediate billet to be consistent.

[0051] The following examples are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operating processes, but the scope of protection of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0052] [Example 1]

[0053] S1. The secondary system analyzes and determines the head camber value of the intermediate billet during rough rolling of each heating furnace billet;

[0054] The heating furnaces are set to 1#, 2#, and 3#, and the slabs are circulated and tapped in order of the furnace numbers. The head camber values ​​of the roughing intermediate slabs of the cyclic heating furnace sequence number are taken as B1=20mm, B2=25mm, and B3=15mm, respectively. The head camber values ​​of the roughing intermediate slabs are compared and analyzed.

[0055] The side bending values ​​B1, B2, and B3 of the rough rolling intermediate billet head are all positive numbers, that is, they are in the same direction, and the side bending values ​​|B1|≤30mm, |B2|≤30mm, and |B3|≤30mm. The judgment result is that the material shape trend of the rough rolling intermediate billet head of the steel billets rolled by the three heating furnaces is consistent.

[0056] S2. The secondary system outputs the judgment result to the heating human-machine interface; the judgment result in step S1 is that the material shape trend of the head of the rough-rolled intermediate billet rolled by the three heating furnaces is consistent, and when the material shape trend of the head of the intermediate billet is consistent, it is not displayed on the heating human-machine interface.

[0057] S3. The heating operator does not need to adjust the heating furnace.

[0058] [Example 2]

[0059] S1. The secondary system analyzes and determines the head camber value of the intermediate billet during rough rolling of each heating furnace billet;

[0060] The heating furnaces are set to 1#, 2#, and 3#, and the slabs are circulated and tapped in order of the furnace numbers. The head camber values ​​of the roughing intermediate slabs of the cyclic heating furnace sequence number are B1=50mm, B2=23mm, and B3=11mm, respectively. The head camber values ​​of the roughing intermediate slabs are compared and analyzed.

[0061] The camber values ​​B1, B2, and B3 of the roughing intermediate billet head are all positive, that is, in the same direction. The camber values ​​|B1|>30mm, |B2|≤30mm, and |B3|≤30mm. It is determined that there is a difference in the shape trend of the roughing intermediate billet head during billet rolling in the No. 1 heating furnace. The difference value Bc1=|B1|-30mm=50mm-30mm=20mm.

[0062] Judgment result: "Furnace No. 1 is 20mm off to the working side."

[0063] S2. The secondary system outputs the judgment result to the heating human-machine screen. The secondary system transmits the judgment result of the inconsistent material shape trend of the head of the intermediate billet after rough rolling in the heating furnace, "No. 1 furnace deviates from the working side by 20mm", to the human-machine screen of the 1# heating furnace.

[0064] S3. The heating operator adjusts the furnace condition of No. 1 heating furnace based on the judgment result displayed on the human-machine interface of No. 1 heating furnace, and adjusts the lateral bending trend of the head of the rough-rolled intermediate billet to be consistent with the lateral bending trend of the two other heating furnaces.

[0065] [Example 3]

[0066] S1. The secondary system analyzes and determines the head camber value of the intermediate billet during rough rolling of each heating furnace;

[0067] The heating furnace numbers are set as 1#, 2#, and 3#, and the slabs are circulated and discharged in sequence according to the furnace numbers. The head side bending values ​​of the rough-rolled intermediate slabs with a circulating heating furnace sequence number are taken as B1=30mm, B2=20mm, and B3=-25mm, respectively. The head side bending values ​​of the rough-rolled intermediate slabs are compared and analyzed.

[0068] In this case, the head camber values ​​of the rough rolling intermediate billets are sorted from large to small. The number of groups with positive camber values ​​is 2, and the number of groups with negative camber values ​​is 1. Based on the positive camber values, the head shape trend of the intermediate billets of the heating furnace with negative camber values ​​after rough rolling is different, that is, the camber trend of the intermediate billets of the 3# heating furnace is different, and the difference is -25mm.

[0069] Judgment result: "Furnace No. 3 is 25mm off to the transmission side."

[0070] S2. The secondary system outputs the judgment result to the heating human-machine screen. The secondary system transmits the judgment result of the inconsistent material shape trend of the head of the intermediate billet after rough rolling of the heating furnace billet "No. 3 furnace deviates 25mm from the transmission side" to the human-machine screen of the 3# heating furnace.

[0071] S3. The heating operator adjusts the furnace condition of the 3# heating furnace based on the judgment result displayed on the human-machine interface of the 3# heating furnace, and adjusts the lateral bending trend of the head of the rough-rolled intermediate billet to be consistent with the lateral bending trend of the two other heating furnaces.

Claims

1. A method for detecting the consistency of the lateral bending trend of the intermediate billet of the hot-rolled strip rough rolling, characterized in that: The steps include: S1. The secondary system analyzes and determines the head camber value of the intermediate billet during rough rolling of each heating furnace billet; S1.

1. Slabs are circulated and tapped in order of heating furnace numbers. The corresponding rough rolling intermediate slab head camber values ​​are calculated to determine whether the cambers of the intermediate slabs of each furnace number are in the same direction. S1.

2. When the lateral curvature of the intermediate billets of each furnace number is in the same direction, and the absolute value of each lateral curvature value does not exceed 30 mm, it is determined that the material shape trend of the head of the rough-rolled intermediate billets rolled by all the heating furnaces is consistent. If the absolute value of each lateral curvature value is greater than 30 mm, it is determined that the material shape trend of the head of the rough-rolled intermediate billets rolled by all the heating furnaces is different, and the difference value is calculated; S1.

3. When the sides of the intermediate billets of each heat are in different directions, the number of positive and negative side bending values ​​shall be counted; S1.

4. When the number of positive camber values ​​is not less than the number of negative camber values, it is determined that there is a difference in the shape trend of the head of the intermediate billet after rough rolling of the heating furnace billet with negative camber values, and the difference is the corresponding camber value; For positive camber values ​​greater than 30 mm, there is a difference in the shape trend of the head of the rough-rolled intermediate billet produced by heating furnace billet rolling, and the difference value is calculated; S1.

5. When the number of positive camber values ​​is less than the number of negative camber values, it is determined that there is a difference in the shape trend of the head of the intermediate billet after rough rolling of the heating furnace billet with positive camber values, and the difference is the corresponding camber value; For negative camber values ​​greater than 30 mm, there is a difference in the shape trend of the head of the rough-rolled intermediate billet produced by heating furnace billet rolling, and the difference value is calculated; S2. The judgment result is output to the first-level heating human-machine interface to display the difference furnace result; S3. Adjust the furnace conditions of the differential furnace and adjust the head bending value trend of the rough rolling intermediate billet to be consistent.

2. The method for detecting the consistency of the lateral bending trend of the intermediate billet of the hot-rolled strip rough rolling according to claim 1, characterized in that: In the step S1.1, whether the side bending of the intermediate billets of each heat number is in the same direction is determined as follows: when the head side bending values ​​of the rough rolling intermediate billets of each heat number are all positive or negative, it is determined that the side bending of the intermediate billets of each heat number is in the same direction.

3. The method for detecting the consistency of the lateral bending trend of the intermediate billet of the hot-rolled strip rough rolling according to claim 1, characterized in that: In the step S1.2, the difference value is calculated as follows: difference value = absolute value of the head camber value of the rough rolling intermediate billet whose absolute value of the camber value is greater than 30 mm - 30 mm.

4. The method for detecting the consistency of the lateral bending trend of the intermediate billet of the hot-rolled strip rough rolling according to claim 1 is characterized in that: In the step S1.4, the difference value is calculated as follows: difference value = the head camber value of the rough rolling intermediate billet which is a positive camber value and is greater than 30 mm - 30 mm.

5. The method for detecting the consistency of the lateral bending trend of the intermediate billet of the hot-rolled strip rough rolling according to claim 1, characterized in that: In the step S1.5, the difference value is calculated as follows: difference value = absolute value of the head camber value of the rough rolling intermediate billet which is a negative camber value and whose absolute value is greater than 30 mm - 30 mm.

6. The method for detecting the consistency of the lateral bending trend of the intermediate billet of the hot-rolled strip rough rolling according to claim 1, characterized in that: The determination result of step S2 includes the furnace number, difference direction, difference value, and difference direction.

7. The method for detecting the consistency of the lateral bending trend of the intermediate billet of the hot-rolled strip rough rolling according to claim 6, characterized in that: The difference direction includes the working side and the transmission side. When the side bending value is positive, the head of the intermediate billet during rough rolling of the heating furnace billet is biased towards the working side. When the side bending value is negative, the head of the intermediate billet during rough rolling of the heating furnace billet is biased towards the transmission side.

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