JP4285154B2 - Rolling method setting method - Google Patents

Description

  The present invention relates to a method for setting a steel material rolling method, and is particularly suitable for selecting either a high-stop rolling method or a high-efficiency rolling method.

  Generally, a rolling method is determined based on a slab size, a rolling dimension, a rolling direction, and the like, and a rolling material is calculated and set in accordance with the rolling method. On the other hand, in the yield calculation, using the rolled material, the standard yield obtained from the size of the slab necessary for manufacturing the product, and the rolling yield obtained from the size of the slab determined from the restrictions on rolling ( Usually the same as the standard yield). Usually, since the rolling material is calculated and set for one rolled material to be rolled by one rolling method, the calculated yield is one by one. For example, Patent Document 1 manufactures steel plates having different thicknesses by performing different thickness rolling in a single rolling process to improve efficiency. However, the rolling material is assumed to be rolled by a high-stop rolling method. Calculated.

  However, conventionally, in order to achieve as high a yield as possible, the rolling material is calculated in advance as rolling with a high-stop rolling method. As a result, there was a problem that efficiency was lowered.

  The technique disclosed in Patent Document 2 calculates a rolling material in each of the case of rolling with a high-stop rolling method and the case of rolling with a high-efficiency rolling method, calculates parameters based on each rolling material, The above problems are solved by evaluating each of the rolling yield, the risk of downgrade risk, and the efficiency based on the rolling method, and setting which rolling method is used for the rolling in the overall evaluation.

  In addition to the above-described standard yield and rolling yield, the above parameters can include overall accuracy and risk factor set values set by the standard yield method.

  Hereinafter, the prior art disclosed in Patent Document 2 will be described.

  FIG. 4 shows the logic of a conventional rolling method setting method. In this logic, first, the rolling material is calculated on the assumption that rolling is performed by the high-stop rolling method. Next, a rolling raw material is calculated on the assumption that rolling is performed by a high-efficiency rolling method. Next, based on the rolling material obtained by each rolling method, the standard yield KY, the rolling yield AY, the overall accuracy D2, and the risk factor set value K are obtained, and further for determination from the following formulas (1) and (2) Each parameter for evaluation of rolling yield HAY and downgrade risk JK is calculated.

HAY = AY + α (1)
However, α is a yield correction rate, and is set according to the required high efficiency.

  Note that the rolling yield for judgment HAY is set only by the rolling yield AY calculated as rolling by the high-efficiency rolling method, and rolling by the high-stop rolling method. The rolling yield AY calculated as follows is used as it is as the rolling yield HAY for determination. In other words, since the high yield rolling method is originally intended to achieve a high yield, the yield is naturally higher than that of the high efficiency rolling method.

  Therefore, the efficiency required by the line, that is, the yield correction rate α is set in accordance with the requested operation state, and this is added to the rolling yield AY of the high efficiency rolling method with a low yield to increase the required efficiency. The higher the value, the greater the opportunity for selecting a high-efficiency rolling method.

YSA = KY-AY
JK = (D2 × K + YSA) / 2 (2)
By the way, the crash risk factor JK is a risk factor that considers whether the target plate width and plate thickness accuracy can be obtained, for example, and is set so that the higher the risk that accuracy cannot be obtained, the smaller the value It is.

  Next, according to the control table shown in FIG. 5, for the two rolling methods, ranking of rolling yield, ranking of the risk of downgrade, ranking of efficiency, evaluation of each of the above evaluation items, These rolling methods are comprehensively evaluated to determine which rolling method is selected. Of course, at this time, the rolling material is calculated in advance.

  In the control table of FIG. 5, the determination rolling yield HAY is first used, and the rolling yield rank AYRUNK of the higher (larger) rolling yield HAY of the reflecting rolling yield HAY of the two rolling methods is reduced to 1 ( The smaller rolling yield rank AYRUNK is set to 2. Next, using the above-described risk of risk JK, for each of the two rolling methods, if the risk of risk JK is greater than the threshold, the risk of risk rank KRUNK is set to 1, and the risk of risk JK If the numerical value is smaller than the threshold value and the numerical value is large, the risk factor rank KRUNK is set to 2, and if the critical risk factor JK is smaller than the threshold value and the numerical value is small, the risk factor rank KRUNK is set to 3. . Next, the efficiency rank NRUNK is set to 1 for the high-efficiency rolling method, and the efficiency rank NRUNK is set to 2 for the high-stop rolling method.

  Then, the overall rank GRUNK is calculated according to the following formula (3), and the smaller rolling method is selected from the overall rank GRUNK of the high-efficiency rolling method and the overall rank GRUNK of the high-stop rolling method.

GRUNK = AYRUNK × 100 + KRUNK × 10 + NRUNK ……… (3)
Note that the above evaluation parameters are not limited to the above, and other parameters or combinations with other parameters can be set as necessary.
JP 59-232606 JP 2001-179315 A

  However, in the prior art disclosed in Patent Document 2, evaluation is performed when rolling is performed by a high-stop rolling method and when rolling is performed by a high-efficiency rolling method before the rolling material is manufactured, and rolling is performed by any of the above-described rolling methods. If the actual dimensions of the rolled material change with respect to the planned dimensions, it will not be possible to respond immediately, resulting in a decrease in efficiency or an increase in disqualification. There was a problem.

  The present invention has been developed to solve this problem, and can respond immediately to changes in the actual dimensions of the rolled material, thereby avoiding a reduction in efficiency and an increase in downgrades and further improving them. A rolling method setting method that can be performed is provided.

  The present invention calculates the rolling material in each of the case of rolling by the high yield rolling method and the case of rolling by the high efficiency rolling method, calculates the parameter based on each rolling material, and the rolling yield based on each parameter. In the rolling method setting method in which evaluation is performed with respect to each of the risk rate of downgrade and efficiency, and in which rolling method is used to set the rolling method in the overall evaluation, the weight measured after the production of the rolling material and / or Or, based on the parameters calculated based on the measurement results of the actual dimensions, re-evaluate each of the downgrade risk rate and efficiency, and finally set which rolling method to use for rolling based on their comprehensive judgment The above problems have been solved by a rolling method setting method characterized by reworking.

  According to the present invention, it is possible to suppress a decrease in yield and efficiency and further improve them.

  Hereinafter, the best mode for carrying out the present invention will be described. FIG. 1 shows the logic of a rolling method setting method applied to the present invention.

  In this logic, first, the rolling method set in the rolling method setting method given in Patent Document 2 is set as “current command A”, and the rolling method not set is set as “backup command B”.

  Next, the actual dimensions of the manufactured rolled material are measured (for example, weight, width, length, thickness), the actual rolling yield YAY is calculated, and the “current command A” and “backup command B” rolling methods are calculated. Calculate the actual risk of degrading JJK using Equation (4). Here, KY and D2 are the reference yield and the overall accuracy obtained when the rolling method of “current command A” and “backup command B” is set previously.

JYSA = KY-JAY
JJK = (D2 × K + JYSA) / 2 (4)
By the way, the actual failure risk factor JJK is a risk factor that considers whether the target plate radiation and plate thickness accuracy can be obtained, for example, and is set so that the numerical value becomes smaller as the risk that accuracy cannot be obtained is higher It is.

  Next, according to the control table of FIG. 2, the evaluation items of the actual risk rating ranking and the efficiency ranking are re-evaluated for the rolling methods of “current command A” and “backup command B”. Then, they are comprehensively evaluated to finally determine which rolling method is selected.

  In the control table of FIG. 2, first, the actual downgrade risk rate JJK is used. For each rolling method of “current command A” and “backup command B”, if the real downgrade risk rate JJK is greater than the threshold value, the real downgrade risk is reached. If the rate rank JKRUNK is set to 1 and the actual bad risk rate JJK is smaller than the threshold and the numerical value is large, the real bad risk rate rank JKRUNK is set to 2, and the real bad risk rate JJK is less than the threshold. If the value is small and the numerical value is small, the actual risk rating rank JKRUNK is set to 3. Next, the efficiency rank NRUNK is set to 1 for the high-efficiency rolling method, and the efficiency rank NRUNK is set to 2 for the high-stop rolling method.

  Then, the actual overall rank JGRUNK is calculated according to the following equation (5), and the smaller rolling method is selected from the actual overall rank JGRUNK of “current command A” and “backup command B”.

JGRUNK = JKRUNK × 10 + NRUNK ……… (5)
The evaluation parameters are not limited to those described above, and other parameters, or combinations with other parameters, can be set as necessary, according to the conventional rolling method. This is the same as the setting method.

  FIG. 3 is a graph showing an example of the present invention implemented by the rolling method setting method of the present invention described above in comparison with a conventional example by a conventional rolling method setting method, where (a) is a rolling efficiency, b) shows the risk rate of downgrade, and (c) shows the backup command usage rate.

  As shown in FIG. 3, in the example of the present invention, the risk of downgrade risk and the rolling efficiency are re-evaluated based on the actual dimensions of the rolled material, and the rolling method effective for improving the efficiency or reducing the downgrade is reset. The use of the backup instruction according to the method of the present invention has resulted in better results than the conventional example in terms of efficiency improvement and prevention of degradation.

  As described above, in the method of the present invention, based on the actual dimensions of the rolled material, parameters are calculated for each of the case of rolling by the high-stop rolling method and the case of rolling by the high-efficiency rolling method, and based on each parameter. Re-evaluation was conducted for each of the risk of downgrade risk and efficiency, and a final decision was made by reviewing whether or not to perform rolling by any one of the rolling methods in their overall evaluation. As a result, compared to the conventional method, the rolling method has a higher efficiency at a constant downgrade, or the rolling method has a lower downgrade risk rate at a constant efficiency, or has a higher efficiency and a downgrade risk rate. In addition, a low rolling method and the above rolling method can be selected as appropriate, and efficiency can be improved and downgrades can be reduced.

It is a logic flowchart which shows the best form for implementing the rolling method setting method of this invention. It is a control table which shows the detail of the logic of FIG. It is a graph which compares the effect of an example of the present invention and a conventional example, (a) shows rolling efficiency, (b) shows a downgrade risk rate, and (c) shows a backup command usage rate. It is a logic flowchart which shows one Embodiment of the conventional rolling method setting method. 5 is a control table showing details of the logic of FIG.

Claims (1)

Calculate the rolling material for rolling with the high-stop rolling method and rolling with the high-efficiency rolling method, calculate the parameters based on each rolling material, and reduce the rolling yield and downgrade risk based on each parameter. In the rolling method setting method for setting the rolling method in which the rolling method is performed in the overall evaluation, the evaluation is performed in each of the efficiency and the efficiency.
Further, based on the parameters calculated based on the measurement results of the weight and / or dimensions measured after the production of the rolled material, re-evaluation is performed with respect to each of the risk of degradation and efficiency, and any of the above in the overall determination. A rolling method setting method, characterized by finally setting whether to perform rolling by any of the rolling methods.

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