Method for detecting side bending trend consistency of rough rolling intermediate billet of hot rolled strip

Abstract

The invention relates to a hot-rolled strip rough rolling intermediate billet lateral bending trend consistency detection method, which comprises the following steps that a secondary system analyzes and judges the head lateral bending value of an intermediate billet rolled by billet rough rolling of each heating furnace, the judgment result is output to a primary heating man-machine picture to display the result of a differential furnace, and the furnace condition of the differential furnace is adjusted; the tendency of the side bending value of the head of the rough-rolled intermediate billet is adjusted to be consistent; according to the method, a secondary system is used for carrying out statistical analysis on the lateral bending value of the head of the rough-rolled intermediate billet, the lateral bending tendency of the head of the intermediate billet after the billet in the heating furnace is rough-rolled is judged, meanwhile, a lateral bending tendency difference result is displayed on a heating terminal man-machine picture, and a heating operator can heat the intermediate billet according to the lateral bending tendency difference result. The middle billet head lateral bending trend difference furnace is rapidly adjusted, it is guaranteed that rough rolling middle billets of billets of each heating furnace are consistent in shape trend, the threading stability of finish rolling heads is improved, the rolling efficiency is improved, meanwhile, waste and defective products caused by head smooth folding and steel clamping are reduced, and the rolling line yield and the product quality are improved.

Description

Technical Field

[0001] The 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 steel billet is heated to the rolling temperature by the heating furnace, the heated steel billet is rolled by the rough rolling mill. Whether the head bending trend of the rough rolling intermediate billet is consistent directly affects the stability of the strip rolling in the next process of the finishing mill, especially for steels with high rolling hardness and small thickness. At present, when a hot rolling production line has billets of different furnace numbers undergoing rough rolling, when the roll gap deviation value on both sides of the rough rolling mill remains unchanged, the head bending of the rough rolling intermediate billet changes frequently, and the head bending trend is inconsistent, causing the change of the direction of the strip head during the next process of finishing rolling, resulting in accidents such as folding and steel jamming. The problem of inconsistent head bending trend of the rough rolling intermediate billet can only be improved by timely adjusting the heating furnace condition, but the heating screen cannot display the bending value of the rough rolling area, so the inconsistent rough rolling bending trend 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 during heating to ensure that the shape trends of the intermediate billets of all the billets in the furnace after rough rolling are consistent, 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 a hot-rolled plate and strip, 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 head strip threading, and improving the rolling efficiency, while reducing waste and defective products caused by head folding and steel jamming, and improving the rolling line yield rate 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-rolled 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 billet;

[0007] S1.1. The slabs are circulated and discharged in sequence according to the heating furnace numbers, and the corresponding rough rolling intermediate slab head bending values ​​are calculated to determine whether the bending of the intermediate slabs of each furnace number is in the same direction;

[0008] S1.2. When the lateral bending of the intermediate billets of each furnace number is in the same direction, and the absolute value of each lateral bending 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 heating furnaces is consistent. When the absolute value of each lateral bending 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 heating furnaces is different, and the difference value is calculated;

[0009] S1.3. When the sides of the intermediate billets of each furnace number 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 of the billet rolled in the heating furnace, and the difference value is calculated;

[0012] S1.5. When the positive bending value is less than the negative value, it is determined that the head shape trend of the intermediate billet of the heating furnace billet with a positive bending value after rough rolling is different, and the difference value corresponds to the bending 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 of the corresponding heating furnace billet, and the difference value is calculated.

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

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

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

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

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

[0019] Furthermore, in the step S1.5, the difference value is calculated: the difference value = the absolute value of the head camber value of the rough rolling intermediate billet which is a negative camber value and the 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 working side and a transmission side. When the side bending value is a positive number, it corresponds to the working side of the head of the intermediate billet during rough rolling of the heating furnace billet. When the side bending value is a negative number, it corresponds to the transmission side of the head of the intermediate billet during rough rolling of the heating furnace billet.

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

[0023] 1) Through the secondary system, the lateral bending value of the head of the rough rolling intermediate billet is statistically analyzed to determine the lateral bending trend of the head of the intermediate billet after rough rolling in the heating furnace. At the same time, the lateral bending trend difference results are displayed on the human-machine screen of the heating terminal. 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 results to ensure that the shape trend of the rough rolling intermediate billet 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 head shape of the rough rolling intermediate billet, ensures the stability of the head threading 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 is a flow chart for judging the lateral bending trend of the head of the intermediate billet during the rough rolling of the steel billet in the heating furnace.

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

[0028] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0029] See Figure 1 , is a flow chart of the method of the present invention. A method for detecting the consistency of the lateral bending trend of a hot-rolled plate and strip rough-rolled intermediate billet of the present invention comprises 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, the heating furnace number is set to 1#, 2#, 3#...n#, the slabs are circulated in the order of the furnace number, take the head bending value of the rough rolling intermediate billet of a circulating heating furnace sequence number, which are B1, B2, B3...Bn, respectively, 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. The slabs are circulated and discharged in sequence according to the heating furnace numbers, and the corresponding rough rolling 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. When the camber values ​​of the rough rolling intermediate billets of each furnace number are all positive or negative, it is determined that the cambers of the intermediate billets of each furnace number are in the same direction.

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

[0034] (1) When the side bending values ​​|B1|, |B2|, |B3|, ..., |Bn| are all ≤30 mm, the judgment result is that the head shape trend of the rough rolling intermediate billet rolled by all heating furnaces 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, the billet in the heating furnace with an absolute value of the camber value of the head of the rough rolling intermediate billet greater than 30 mm has a difference in the material shape trend of the head of the intermediate billet after rough rolling, that is, the billet in the heating furnace with an absolute value of the camber value of the head of the rough rolling intermediate billet greater than 30 mm has a difference in the material shape trend of the head of the intermediate billet after rough rolling, and the difference is calculated:

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

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

[0038] When the head bending values ​​B1, B2, B3...Bn of the rough rolling intermediate billet are in different directions, that is, the head bending values ​​of the rough rolling intermediate billet are positive or negative, in this case, the head bending values ​​of the rough rolling intermediate billet are sorted from large to small, and the positive bending values ​​are grouped as a group, and the number in the group is Σbz, and the negative bending values ​​are grouped as a group, and the number in the group is Σbf, and the numbers of Σbz and Σbf are compared;

[0039] S1.4, when Σbz ≥ Σbf, the positive lateral bending value shall be taken 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 side bending value is different, and the difference value is Bfn;

[0041] (2) The head shape of the intermediate billet of the heating furnace with positive camber value after rough rolling is compared again. In Σbz, it is judged that the furnace number with the head camber value of the intermediate billet of rough rolling greater than 30 mm has a trend difference, and the difference value is Bzn.

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

[0043] S1.5, when Σbz<Σbf, the negative lateral bending value shall be taken 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 side bending value is different, and the difference value is Bzn;

[0045] (2) The material shapes of the heads of the intermediate billets of the heating furnace with negative camber values ​​after rough rolling are compared again. In Σbf, it is judged that the furnace numbers with the absolute values ​​of the camber 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 screen 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 a positive number, 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 a negative number, 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 furnace conditions of the heating furnace based on the judgment results displayed on the human-machine screen of the heating furnace, and adjusts the head bending value trend of the rough-rolled intermediate billet to be consistent.

[0051] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope 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 furnace number is set as 1#, 2#, and 3#, and the slabs are circulated and discharged in sequence according to the furnace number. The head camber values ​​of the rough rolling intermediate slabs of the sequence number of the circulating heating furnace are taken as B1=20mm, B2=25mm, and B3=15mm, respectively. The head camber values ​​of the rough rolling intermediate slabs are compared and analyzed.

[0055] The lateral bending values ​​B1, B2, and B3 of the head of the rough-rolled intermediate billet are all positive numbers, that is, they are in the same direction, and the lateral bending values ​​|B1|≤30mm, |B2|≤30mm, and |B3|≤30mm. The judgment result is that the material shape trend of the head of the rough-rolled intermediate billet 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 in 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 furnace number is set as 1#, 2#, and 3#, and the slabs are circulated and discharged in the order of the furnace numbers. The head camber values ​​of the rough rolling intermediate slabs of the order number of the circulating heating furnace are taken as B1=50mm, B2=23mm, and B3=11mm, respectively. The head camber values ​​of the rough rolling intermediate slabs are compared and analyzed.

[0061] The camber values ​​B1, B2, and B3 of the head of the rough rolling intermediate billet are all positive numbers, 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 material shape trend of the head of the rough rolling intermediate billet when the billet is rolled in the 1# heating furnace, and the difference value Bc1=|B1|-30mm=50mm-30mm=20mm;

[0062] Judgment result: "Furnace No. 1 is 20mm off 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 of the heating furnace billet "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 the No. 1 heating furnace based on the judgment result displayed on the human-machine screen of the 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 outer 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 billet;

[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 bending values ​​of the rough-rolled intermediate slabs with a circulating heating furnace sequence number are taken, which are B1=30mm, B2=20mm, and B3=-25mm, respectively. The head 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 billets 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 from the transmission side by 25mm" 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 screen 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 outer 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. The slabs are circulated and discharged in sequence according to the heating furnace numbers, and the corresponding rough rolling intermediate slab head bending values ​​are calculated to determine whether the bending of the intermediate slabs of each furnace number is in the same direction; S1.

2. When the lateral bending of the intermediate billets of each furnace number is in the same direction, and the absolute value of each lateral bending 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 heating furnaces is consistent. When the absolute value of each lateral bending 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 heating furnaces is different, and the difference value is calculated; S1.

3. When the sides of the intermediate billets of each furnace number 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 the material 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; 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 of the billet rolled in the heating furnace, and the difference value is calculated; S1.

5. When the positive bending value is less than the negative value, it is determined that the head shape trend of the intermediate billet of the heating furnace billet with a positive bending value after rough rolling is different, and the difference value corresponds to the bending 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 of the corresponding heating furnace billet, and the difference value is calculated. S2. The judgment result is output to the primary heating human-machine screen to display the difference furnace result; S3. Adjust the furnace conditions of the difference 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 hot-rolled strip rough rolling intermediate billet according to claim 1 is characterized in that: In the step S1.1, whether the side bending of the intermediate billets of each furnace number is in the same direction is determined as follows: when the head side bending values ​​of the rough-rolled intermediate billets of each furnace number are all positive or negative, it is determined that the side bending of the intermediate billets of each furnace number is in the same direction.

3. The method for detecting the consistency of the lateral bending trend of the hot-rolled strip rough rolling intermediate billet according to claim 1 is characterized in that: In the step S1.2, the difference value is calculated: 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 hot-rolled strip rough rolling intermediate billet according to claim 1 is characterized in that: In the step S1.4, the difference value is calculated: difference value = the head camber value of the rough rolling intermediate billet which is a positive camber value and has a camber value greater than 30 mm - 30 mm.

5. The method for detecting the consistency of the lateral bending trend of the hot-rolled strip rough rolling intermediate billet according to claim 1 is characterized in that: In the step S1.5, the difference value is calculated: 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 hot-rolled strip rough rolling intermediate billet according to claim 1, characterized in that: The determination result of step S2 includes furnace number, difference direction, difference value, and difference direction.

7. A 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.

Images