JP4284800B2 - Rolling method setting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
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.
[0002]
[Prior art]
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, in Japanese Patent Application Laid-Open No. 59-232606, steel sheets having different thicknesses are manufactured in a single rolling process by carrying out different thickness rolling, and the efficiency is improved. The rolling material is calculated as
[0003]
[Problems to be solved by the invention]
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. There is a problem that the efficiency is lowered as a result.
The present invention has been developed to solve the above-mentioned problems, and can respond immediately to changes in the required operating state, so that it is possible to avoid a decrease in yield and efficiency, and to further improve them. An object of the present invention is to provide a rolling method setting method for setting a rolling method.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the rolling method setting method of the present invention calculates the rolling material in the case of rolling by the high yield rolling method and in the case of rolling by the high efficiency rolling method, and based on each rolling material. To calculate the predetermined parameters, to evaluate each of the rolling yield, the risk of downgrade risk, and the efficiency based on each parameter, and to set which rolling method to perform the rolling in their overall evaluation It is a feature.
[0005]
In addition to the above-described standard yield and rolling yield, the predetermined parameter includes the total accuracy and risk factor set value set by the standard yield method.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. FIG. 1 shows the logic of the rolling method setting method of this embodiment. 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, from the rolling materials obtained by the respective rolling methods, the standard yield KY, the rolling yield AY, the overall accuracy D2, and the risk factor set value K are obtained, and the rolling yield HAY for judgment is further calculated from the following formulas 1 and 2. Then, each evaluation parameter of the downgrade risk rate JK is calculated.
[0007]
HAY = AY + α (1)
However, α is a yield correction rate, and is set according to the required efficiency according to FIG. 2 described later. Note that the rolling yield for determination HAY is set only in the above-mentioned one set only for the rolling yield AY calculated as rolling by the high-efficiency rolling method, and is calculated as rolling by the high-stop rolling method. The rolled yield AY 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, as described later, 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 obtain the required The higher the efficiency that is achieved, the greater the chance that a high efficiency rolling process will be selected.
[0008]
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.
[0009]
Next, according to the control table of FIG. 3 to be described later, for each of the two rolling methods, evaluation of each evaluation item of the ranking of the rolling yield, the ranking of the danger rate of the downgrade, the ranking of the efficiency, Is evaluated as an overall rank to determine which rolling method is to be selected. Of course, at this time, the rolling material is calculated in advance.
[0010]
In the control table of FIG. 3 described above, first, the determination rolling yield HAY is used, and of the two rolling methods, the higher (larger) rolling yield rank AYRUNK of the reflecting rolling yield HAY is set to 1. The lower (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.
[0011]
Then, the overall rank GRUNK is calculated according to the following three formulas, 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)
Next, a description will be given of the yield correction value α selected on the map of FIG. This control map represents, for example, the rolling influence rate when the yield correction value α is operated in one month of operation, here the relationship between efficiency and yield. As described above, the larger the yield correction value α is, the larger the rolling yield for determination HAY calculated by the above equation 1 is, so the rolling yield rank AYRUNK is set to 1 in the control table of FIG. Since the possibility of being set increases and as a result, the overall rank GRUNK becomes smaller, the possibility of selecting a high-efficiency rolling method increases. Therefore, as the yield correction value α increases, the efficiency improves and the yield decreases. However, the rate of decrease in yield is much smaller than the efficiency improvement fee. Specifically, when the yield correction value α is set to 1.5%, the efficiency improvement margin is 1.5%, but the yield reduction rate is 0.04%. Therefore, although a slight decrease in yield occurs when the required efficiency is high, an improvement in efficiency that can compensate for the decrease in yield can be expected by appropriately setting the retention correction value α. On the contrary, although not shown in FIG. 2, there is a step correction value α that greatly improves the yield even if the efficiency is slightly reduced. In such a case, the step correction value α By setting appropriately, it is possible to improve the yield to such an extent that the reduction in the efficiency can be guaranteed.
[0012]
The evaluation parameters are not limited to those described above, and other parameters or combinations with other parameters can be set as necessary.
[0013]
【The invention's effect】
As described above, according to the rolling method setting method of the present invention, the rolling material is calculated in 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 rolling material. Calculating a predetermined parameter, and evaluating each of the rolling yield, the risk of downgrade risk, and the efficiency based on each parameter, and setting which rolling method to perform the rolling in their comprehensive evaluation; Therefore, even if the yield drops slightly, the efficiency is greatly improved to compensate for the decrease in yield, and conversely the efficiency is improved by significantly improving the yield against a slight decrease in efficiency. Since the amount of decrease can be compensated for, it is possible to suppress the decrease in yield and efficiency and further improve them.
[Brief description of the drawings]
FIG. 1 is a logic flowchart showing an embodiment of a rolling method setting method of the present invention.
FIG. 2 is a control map used in the logic of FIG.
FIG. 3 is a control table showing details of the logic of FIG. 1;

Claims (1)

The rolling material is calculated for each of the rolling with the high yield rolling method and the rolling with the high efficiency rolling method, and predetermined parameters are calculated based on each rolling material. A rolling method setting method characterized in that evaluation is performed by each of a drop risk rate and an efficiency, and the rolling method is set by the above-described comprehensive evaluation.

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