A dynamic adjustment method for batch rolling points in heavy plate rolling

Abstract

The present invention relates to the field of plate rolling, and specifically discloses a method for dynamically adjusting the batch rolling point in heavy plate rolling; the present invention adjusts the traditional batch rolling process by obtaining the total length L of the roller table between rough rolling and finish rolling 总 , the length L where the roller table accesses the entrance of finish rolling 接入 , the casting distance L 抛钢 and the preset safety distance L 安全 , the length L of the slab 板坯 , the spacing L between adjacent slabs 间距 and the preset slab swing distance L 摆动 and other various production data, and flexibly adjusts the batch splitting point and batch forming point of batch rolling through two sets of calculation formulas. Even when the length of the slabs in the batch to be processed is short or the number of slab blocks is small, the batch forming point of this batch rolling can be as close as possible to the finish rolling area, thereby reducing the batch splitting distance. As the number of slabs in the whole group increases, the position of the batch forming point will gradually move away from the finish rolling area to obtain a larger batch rolling space, which can not only effectively reduce the ineffective moving distance of the slabs, but also effectively reduce the wear of the roller table.

Description

Technical Field

[0001] The present invention belongs to the technical field of plate rolling, and particularly relates to a method for dynamically adjusting the batch rolling point in heavy plate rolling. Background Art

[0002] In the production line of heavy plates with double stands, the batch rolling process between the roughing mill and the finishing mill is frequently used. The so-called batch rolling process means that multiple slabs form a group of slabs between the roughing mill and the finishing mill and swing together to wait for temperature equalization, which is simply called batch rolling. The process of adding the slabs rolled by the roughing mill to the existing whole group of slabs is called batch formation. When the finishing mill area is empty, the first slab in the batch rolling will be split from the whole group of slabs and sent to the finishing area for rolling. The process of splitting the batch rolling for slab finishing is called batch splitting.

[0003] When implementing the current batch rolling process, it is necessary to manually or automatically add the slabs rolled by the roughing mill to the whole group of slabs at a specific position to form batch rolling. When the finishing mill area is empty, the whole group of slabs is conveyed forward together to a specific position, and then the first slab in the whole group of slabs is split and sent to the finishing area for rolling.

[0004] When implementing this process, it can be found that this process has relatively large application defects. Because in the mode of fixed batch formation point, if we want to make full use of the space of the roughing and finishing mill roller tables, such as designing the batch formation point close to the roughing mill, we need to ensure that the roller table between the roughing mill and the finishing mill is long enough to have enough space to accommodate the preset maximum number of batch rolling slabs. Therefore, the direct distance between the specific batch formation point and the specific batch splitting point on the existing roller table is relatively long. At this time, when the whole group of slabs to be finished rolling, that is, the length of the slabs in the batch rolling is short or the number of slabs is small, the whole group of slabs will be close to the roughing mill direction on the long roller table between the specific batch formation point and the specific batch splitting point. When splitting the batch, it is necessary to convey the whole group of slabs forward for a relatively long distance for the splitting operation, and then convey it backward for a relatively long distance for batch formation. During this process, the conveying distance of the slabs in the batch rolling is relatively long, which will not only cause waste of production time, but also cause more wear to the roller table. If the fixed batch formation point is designed close to the finishing mill, it will cause too small batch formation space, waste the production line space, and even the slabs for finishing cannot normally use the batch formation function when the length exceeds a certain range. Generally speaking, the traditional process has relatively large application defects. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a method for dynamically adjusting the batch rolling point in heavy plate rolling, so as to solve the problems in the traditional batch rolling process that the conveying distance of the slabs is relatively long, which will not only cause waste of production time, but also cause more wear to the roller table, and there are relatively large application defects.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A dynamic adjustment method for batch rolling points in heavy plate rolling, comprising:

[0008] Obtain the total length L of the roller table between rough rolling and finish rolling 总 , and determine the length L of the roller table accessing the finish rolling entrance 接入 , the throwing distance L of the roller table 抛钢 and the preset safety distance L 安全 ;

[0009] Obtain the length L of the slab 板坯 , the spacing L between adjacent slabs 间距 and the preset slab swing distance L 摆动 ;

[0010] Taking the end of the roller table close to the finish rolling entrance as the starting point, according to the formula Q 拆批点 =L 接入 +L 抛钢 +L 安全 Calculate the length from the batch splitting point to the starting point, and then determine the position of the batch splitting point on the roller table;

[0011] According to the formula Q 组批点 =L 接入 +L 抛钢 +L 安全 +nL 板坯 + (n - 1)L 间距 +L 摆动 Calculate the length from the batch forming point to the starting point, where n is the number of slabs in batch rolling, and then determine the position of the batch forming point on the roller table.

[0012] Preferably, the L 抛钢 is adjusted according to the speed of the roller table, the L 抛钢 gradually extends as the speed of the roller table increases, and the L 抛钢 gradually shortens as the speed of the roller table decreases.

[0013] Preferably, the number n of slabs satisfies the formula [L 接入 +L 抛钢 +L 安全 +nL 板坯 + (n - 1)L 间距 +L 摆动 <L 总 , and n is an integer.

[0014] Preferably, in the calculation formula of Q 组批点 , L 中间冷却 is increased according to whether an intermediate cooling step is required. If there is no intermediate cooling step in the production process, then Q 组批点 =L 接入+L 抛钢 +L 安全 +nL 板坯 + (n - 1)L 间距 +L 摆动 , if an intermediate cooling step is added in the production process, then Q 组批点 =L 中间冷却 +L 接入 +L 抛钢 +L 安全 +nL 板坯 + (n - 1)L 间距 +L 摆动 .

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] The present invention adjusts the traditional batch rolling process. By obtaining various production data such as the total length L of the roller table between rough rolling and finish rolling 总 , the length L where the roller table accesses the finish rolling inlet 接入 , the throwing distance L 抛钢 and the preset safety distance L 安全 , the length L of the slab 板坯 , the spacing L between adjacent slabs 间距 and the preset slab swing distance L 摆动 etc., the splitting point and grouping point of batch rolling are flexibly adjusted through two groups of calculation formulas. Even when the length of the slabs in the batch to be processed is short or the number of slab blocks is small, the grouping point of this batch rolling can be as close as possible to the finish rolling area, thereby reducing the splitting distance. As the number of slabs in the whole group increases, the position of the grouping point will gradually move away from the finish rolling area to obtain a larger batch rolling space, which can not only effectively reduce the ineffective moving distance of the slabs on the roller table during batch rolling, but also effectively reduce the wear of the roller table. At the same time, it is ensured that when the length of the slabs produced by finish rolling is long and more L 接入 is required, the grouping position is dynamically adjusted, and the grouping position will not be covered by L 接入 , enabling the grouping function to proceed smoothly and realizing the optimization of the batch rolling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the block diagram of the dynamic adjustment method of the present invention;

[0018] Figure 2 is the diagram for determining the grouping point when batch rolling with a total of 3 slabs processed by this method;

[0019] Figure 3 is the diagram for determining the grouping point when batch rolling with a total of 4 slabs processed by this method;

[0020] Figure 4Grouping point determination diagram for batch rolling of a total of 6 slab blanks processed using this method. Detailed implementation mode

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0022] Embodiment:

[0023] Please refer to Figure 1 As shown, a method for dynamically adjusting the batch rolling point in heavy plate rolling includes:

[0024] Obtain the total length L of the roller path between rough rolling and finish rolling 总 , determine the length L where the roller path accesses the finish rolling inlet 接入 , the casting distance L of the roller path 抛钢 and the preset safety distance L 安全 , the L 抛钢 is adjusted according to the speed of the roller path, and the L 抛钢 gradually extends as the speed of the roller path increases, and the L 抛钢 gradually shortens as the speed of the roller path decreases;

[0025] Obtain the length L of the slab blank 板坯 , the spacing L between adjacent slab blanks 间距 and the preset slab blank swing distance L 摆动 ;

[0026] Taking the end of the roller path close to the finish rolling inlet as the starting point, according to the formula Q 拆批点 = L 接入 + L 抛钢 + L 安全 Calculate the length from the splitting point to the starting point, and then determine the position of the splitting point on the roller path;

[0027] According to the formula Q 组批点 = L 接入 + L 抛钢 + L 安全 + nL 板坯 + (n - 1)L 间距 + L 摆动 Calculate the length from the grouping point to the splitting point, where n is the number of slab blanks in batch rolling, and then determine the position of the grouping point on the roller path. The number n of the slab blanks satisfies the formula [L 接入 + L 抛钢 + L 安全 + nL板坯 +(n - 1)L 间距 +L 摆动 <L 总 , and n is an integer, in the calculation formula of Q 组批点 L is increased according to whether an intermediate cooling step is required 中间冷却 , if no intermediate cooling step is added in the production process, then Q 组批点 =L 接入 +L 抛钢 +L 安全 +nL 板坯 +(n - 1)L 间距 +L 摆动 , if an intermediate cooling step is added in the production process, then Q 组批点 =L 中间冷却 +L 接入 +L 抛钢 +L 安全 +nL 板坯 +(n - 1)L 间距 +L 摆动 .

[0028] As can be seen from the above, by obtaining various production data such as the total length L of the roller table between rough rolling and finish rolling 总 , the length L of the roller table accessing the finish rolling inlet 接入 , the casting distance L 抛钢 and the preset safety distance L 安全 , the length L of the slab 板坯 , the spacing L between adjacent slabs 间距 and the preset slab swing distance L 摆动 etc., the splitting point and grouping point of batch rolling can be flexibly adjusted through two sets of calculation formulas. Even when the length of the slabs in the batch to be processed is short or the number of slab blocks is small, the grouping point of this batch rolling can be as close as possible to the finish rolling area, thereby reducing the splitting distance. As the number of the whole group of slabs increases, the position of the grouping point will gradually move away from the finish rolling area to obtain a larger batch rolling space, which can not only effectively reduce the ineffective moving distance of the slabs on the roller table during batch rolling, but also effectively reduce the wear of the roller table. At the same time, it is ensured that when the length of the slabs produced by finish rolling is long and more L 接入 is required, the grouping position is dynamically adjusted, and the grouping position will not be covered by L 接入 , so that the grouping function can proceed smoothly, realizing the optimization of the grouping rolling process.

[0029] Refer to Figure 2, after determining multiple production data such as the length of the roller table between the roughing mill and the finishing mill, the splitting point of the roller table is determined to be the 20th hot inspection position among multiple hot inspection position points, that is, the batch splitting position is the 20th hot inspection position. That is, the entire group of slabs needs to be conveyed to the 20th hot inspection position for splitting. In the figure, IMC is the intermediate cooling position. When the number of slabs in the entire group is small, as shown in the figure, there are already 2 slabs on the current roller table. When forming the 3rd slab, grouping can be carried out at the 15th hot inspection position, which means taking the 15th as the dynamic swing point for batch rolling. This can ensure that, under the condition of meeting production requirements, the distance between the 3rd slab and the 20th hot inspection position is minimized as much as possible, reducing the slab movement distance, shortening the process consumption time, and reducing the wear of the slab on the roller table.

[0030] Refer to Figure 3 , after determining multiple production data such as the length of the roller table between the roughing mill and the finishing mill, the splitting point of the roller table is determined to be the 20th hot inspection position among multiple hot inspection position points, that is, the batch splitting position is the 20th hot inspection position. That is, the entire group of slabs needs to be conveyed to the 20th hot inspection position for splitting. In the figure, IMC is the intermediate cooling position. When the number of slabs in the entire group is small, as shown in the figure, there are already 3 slabs on the current roller table. When forming the 4th slab, grouping can be carried out at the 14th hot inspection position, which means taking the 14th as the dynamic swing point for batch rolling. This can ensure that, under the condition of meeting production requirements, the distance between the 4th slab and the 20th hot inspection position is minimized as much as possible, reducing the slab movement distance, shortening the process consumption time, and reducing the wear of the slab on the roller table.

[0031] Refer to Figure 4 , after determining multiple production data such as the length of the roller table between the roughing mill and the finishing mill, the splitting point of the roller table is determined to be the 20th hot inspection position among multiple hot inspection position points, that is, the batch splitting position is the 20th hot inspection position. That is, the entire group of slabs needs to be conveyed to the 20th hot inspection position for splitting. In the figure, IMC is the intermediate cooling position. When the number of slabs in the entire group is small, as shown in the figure, there are already 5 slabs on the current roller table. When forming the 6th slab, grouping can be carried out at the 11th hot inspection position, which means taking the 11th as the dynamic swing point for batch rolling. This can ensure that, under the condition of meeting production requirements, the distance between the 6th slab and the 20th hot inspection position is minimized as much as possible, reducing the slab movement distance, shortening the process consumption time, and reducing the wear of the slab on the roller table.

[0032] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0033] In the accompanying drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved, and other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

Claims

1. A method for dynamically adjusting batch rolling points in wide and thick plate rolling, characterized in that: include: Get the total length L of the roller table between rough rolling and finishing rolling 总 , determine the length L of the roller table where it enters the finishing entrance 接入 , the steel throwing distance L of the roller 抛钢 and preset safety distance L 安全 ; Get the length L of the slab 板坯 , the distance between adjacent slabs L 间距 And preset slab swing distance L 摆动 ; Taking the end of the roller table near the finishing entrance as the starting point, according to the formula Q 拆批点 =L 接入 +L 抛钢 +L 安全 Calculate the length from the batch splitting point to the starting point, and then determine the position of the batch splitting point on the roller table; According to the formula Q 组批点 =L 接入 +L 抛钢 +L 安全 +nL 板坯 +(n-1)L 间距 +L 摆动 The length from the batch point to the starting point is calculated, where n is the number of slabs in the batch rolling, and the position of the batch point is then determined on the roller table.

2. The method for dynamically adjusting batch rolling points in wide and thick plate rolling according to claim 1, characterized in that: The L 抛钢 According to the speed of the roller table, the L 抛钢 As the speed of the roller increases, the L 抛钢 It gradually shortens as the speed of the roller table decreases.

3. The method for dynamically adjusting batch rolling points in wide and thick plate rolling according to claim 1, characterized in that: The number n of slabs satisfies the formula [L 接入 +L 抛钢 +L 安全 +nL 板坯 +(n-1)L 间距 +L 摆动 ] <L 总 , and n is an integer.

4. The method for dynamically adjusting batch rolling points in wide and thick plate rolling according to claim 1, characterized in that: The Q 组批点 In the calculation formula, L is increased according to whether an intermediate cooling step is required. 中间冷却 If no intermediate cooling step is added in the production process, Q 组批点 =L 接入 +L 抛钢 +L 安全 +nL 板坯 +(n-1)L 间距 +L 摆动 If an intermediate cooling step is added to the production process, Q 组批点 =L 中间冷却 +L 接入 +L 抛钢 +L 安全 +nL 板坯 +(n-1)L 间距 +L 摆动 .

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