Optimizing setting method for speed of vertical roll in hot continuous rolling and rough rolling forward pass rolling process
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A rolling process, optimized setting technology, applied in metal rolling, roll speed control, metal rolling and other directions, can solve the problems of slab edge cracks, vertical roll mill power outages, etc., to prevent power outages and improve initial performance. Effects of speed matching, improved stability and product quality
Active Publication Date: 2018-12-07
BAOSHAN IRON & STEEL CO LTD
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It is used to solve the problem that in the existing steel plate hot rolling process, due to the impact of the impact speed drop after the horizontal rol...
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Embodiment 1
[0076] Such as Figure 5a As shown, when E1-R1 is rolling for the first pass, the learning function of horizontal roll back slip is not put into use. It can be seen from the figure that after the horizontal roll bites the steel, the torque of the vertical roll increases gradually, with a maximum increase of 67.46kNm. According to the above steps, the learning of the backslip coefficient of the horizontal roller is carried out, and the specific implementation is as follows:
[0077] (1) Collect the actual data of rolling in this pass.
[0078] (2) T1 is taken as 1.4, and the average value F of E1 rolling force between E1 biting steel T1 second and R1 biting steel is calculated AVE1 3102kN, average rolling torque G AVE1 is 87.4kNm; T2 is taken as 1.2, and the average rolling force F of E1 within T2 seconds after R1 bites the steel is calculated AVE2 3095kN, average rolling torque G AVE2 It is 125.8kNm.
[0079] (3) due to G AVE2 >G AVE1 , then calculate the maximum value...
Embodiment 2
[0086] Such as Figure 6a As shown, during the third rolling pass of E1-R1, the learning function of backslip of the horizontal roll was not put into use. It can be seen from the figure that after the horizontal roll bites the steel, the torque of the vertical roll decreases gradually, the maximum reduction is 121kNm, and the minimum torque of the vertical roll is -70kNm, that is, the horizontal roll is dragging the vertical roll. According to the above steps, the corrected value of the backslip coefficient of the horizontal roller is calculated to be 0.026, and the new backslip coefficient value is 0.859.
[0087] The backsliding coefficient value is used for the initial speed setting of the next slab, and the actual rolling data is as follows Figure 6b As shown, after the horizontal roll bites the steel, the maximum torque of the vertical roll is only reduced by 55kNm, and the minimum torque of the vertical roll is 9kNm, which is no longer a negative value, and the steel p...
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Abstract
The invention relates to an optimizing setting method for the speed of a vertical roll in the hot continuous rolling and rough rolling forward pass rolling process. The method comprises the steps that(1) actual data are collected; (2) the rolling force average value and the rolling torque average value of the vertical roll before and after steel biting of a horizontal roll are calculated; (3) thecomprehensive torque of the vertical roll before and after steel biting of the horizontal roll is calculated; (4) the backward slip coefficient correction of the horizontal roll is calculated; (5) optimizing study of the backward slip coefficient correction is carried out; and (6) the backward slip coefficient correction of a horizontal roll of a next plate blank is calculated and is used for setting the initial speed of the next plate blank. According to the method, the initial speed matching degree of the vertical roll and the horizontal roll is improved during steel biting, the failures such as tripping of a vertical roll rolling mill or the phenomenon of plate blank edge cracking caused by steel pulling is avoided, and the production stability or product quality is improved. The problem that in the existing steel plate hot rolling process, due to the fact that the influence of impact quick decrease exists after steel biting of the horizontal roll, the failures such as tripping ofthe vertical roll rolling mill or the phenomenon of plate blank edge cracking caused by steel pulling is prone to being caused is solved.
Description
technical field [0001] The invention relates to the technical field of hot rolling, in particular to a method for optimally setting the speed of vertical rolls in the forward pass rolling process of hot continuous rough rolling. Background technique [0002] The schematic diagram of the traditional hot continuous rolling rough rolling area is as follows: figure 1 As shown, after the slab 1 passes through the large pressure measurement SP, it enters the area composed of the middle roller table 2, the vertical roller mill E1+horizontal roller mill R1, the middle roller table 3, the vertical roller mill E2+horizontal roller mill R2, and the middle roller table 4 , reciprocating multi-pass rolling, such as 3-3 passes or 1-5 passes, up to 3-7 passes. In the forward pass (that is, the odd pass), the E1 and E2 rolling mills control the slab width, and the R1 and R2 rolling mills control the slab thickness; The R2 mill controls the slab thickness. Both the pressing stroke and the...
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