JP6493315B2 - Reduction leveling control device and reduction leveling control method - Google Patents

Reduction leveling control device and reduction leveling control method Download PDF

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JP6493315B2
JP6493315B2 JP2016122390A JP2016122390A JP6493315B2 JP 6493315 B2 JP6493315 B2 JP 6493315B2 JP 2016122390 A JP2016122390 A JP 2016122390A JP 2016122390 A JP2016122390 A JP 2016122390A JP 6493315 B2 JP6493315 B2 JP 6493315B2
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amount
rolling
camber
value
rolled
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JP2017225989A (en
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慎也 山口
慎也 山口
三宅 勝
勝 三宅
洸介 日当
洸介 日当
拓哉 松崎
拓哉 松崎
恭平 上山
恭平 上山
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Jfeスチール株式会社
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  The present invention relates to a reduction leveling control device and a reduction leveling control method for controlling a reduction leveling amount of a rolling mill.
  Conventionally, it is known that a camber is generated in a material to be rolled in a hot rolling line in which a rolling process such as rough rolling is performed on the material to be rolled such as a slab. Camber is a phenomenon of bending in the width direction with respect to the longitudinal direction of the material to be rolled (bending in the horizontal direction).
  For example, in the rolling process of the material to be rolled, camber of the material to be rolled is generated due to various causes such as the temperature deviation in the width direction of the material to be rolled and the unevenness in the width direction of the roll opening of the rolling roll. In particular, the cause of the occurrence of camber of the material to be rolled in the rough rolling process is mainly due to insufficient setting of the temperature deviation in the width direction of the material to be rolled and the reduction leveling amount of the rough rolling apparatus.
  When a temperature deviation in the width direction occurs in the material to be rolled, the deformation resistance is small on the high temperature side in the width direction of the material to be rolled compared to the low temperature side. For this reason, the rolling load distribution of the width direction arises in the to-be-rolled material in rough rolling, and the roll gap of the high temperature side rolling roll becomes small compared with the low temperature side in the width direction of the to-be-rolled material. Due to this, on the high temperature side in the width direction of the material to be rolled, the amount of reduction is larger than on the low temperature side, and as a result, the high temperature side in the width direction of the material to be rolled is stretched compared to the low temperature side, A camber that bends from the high temperature side to the low temperature side occurs in the material to be rolled.
  When the reduction leveling amount of the rough rolling apparatus is in an insufficient setting state, a rolling load distribution due to an excessive reduction amount in the width direction occurs in the material to be rolled during rough rolling. As a result, a camber that bends from the side with the large reduction amount to the small side is generated in the material to be rolled. The amount of reduction leveling is the difference in the amount of reduction (reduction level) at both ends in the roll axis direction of a rolling roll constituting a rolling mill such as a rough rolling apparatus.
  In a hot rolling line, when the amount of camber of the material to be rolled (the amount of bending in the width direction with respect to the longitudinal direction of the material to be rolled) is excessively large compared to the allowable range, Trouble of passing the plate that prevents the rolling of the material to be rolled (passing plate) due to unintended contact occurs. This plate-feeding trouble leads to equipment damage in hot rolling lines such as rolling rolls and side guides. Furthermore, when the tail end portion of the material to be rolled comes off from the rolling mill (disengages from the bottom), the edge portion (width direction end portion) of the material to be rolled is folded due to the collision between the material to be rolled and the side guide. A rolling trouble called “squeezing” occurs in which the material to be rolled is rolled.
  As a conventional technique for suppressing the occurrence of the camber of the material to be rolled as described above, for example, in Patent Document 1, a temperature difference at both ends in the width direction of the material to be rolled is measured in advance before rolling. A hot rough rolling method has been proposed in which the reduction leveling amount of the rolling mill (the difference in roll opening between both ends in the width direction of the rolling roll) is set in accordance with the measured temperature difference. In Patent Document 2, a camber of a material to be rolled is detected by a camber meter disposed on one side across a reversible rolling mill, and the material of the material to be rolled in the next pass is detected based on the detection result of the camber. A camber control method has been proposed in which the bending state of the camber is predicted, and when rolling is performed in the next pass, the reduction leveling is controlled based on the predicted bending state of the camber.
JP 60-133904 A Japanese Patent No. 3584661
  Generally, in a rolling mill such as a rough rolling apparatus for rolling a material to be rolled, in order to suppress the occurrence of camber due to the temperature direction temperature deviation of the material to be rolled, the temperature direction temperature deviation occurring in the material to be rolled before rolling is started. The reduction leveling amount is manipulated in response to. In order to perform the operation of the reduction leveling amount corresponding to the temperature deviation in the width direction of the material to be rolled (that is, the reduction leveling operation), conventionally, it is necessary to measure the surface temperature of the material to be rolled on the entrance side of the rolling mill. Has been.
  However, in the hot rolling line, the material to be rolled is preliminarily heated by a heating furnace installed on the upstream side of the rolling mill. Therefore, an oxide scale layer exists on the surface of the material to be rolled. This oxide scale layer hinders highly accurate measurement of the surface temperature of the material to be rolled. Even if descaling using high-pressure water is performed on the material to be rolled on the upstream side of the rolling mill, the surface temperature of the material to be rolled is in the reheat process immediately after descaling. Is not stable. Furthermore, an oxide scale layer starts to be formed again on the surface of the material to be rolled after reheating. Therefore, it is difficult to accurately and stably measure the surface temperature of the material to be rolled on the entrance side of the rolling mill. Even if the rolling leveling operation according to the temperature deviation in the width direction of the material to be rolled is performed based on the measurement result of the surface temperature of the material to be rolled, the camber due to the temperature deviation in the width direction of the material to be rolled can be corrected accurately. It is difficult.
  Furthermore, the cause of the camber due to the temperature deviation in the width direction of the material to be rolled includes a deviation in deformation resistance in the width direction of the material to be rolled (hereinafter referred to as “width direction deformation resistance deviation of the material to be rolled”). The deformation resistance of the material to be rolled varies depending not only on the surface temperature of the material to be rolled but also on the internal temperature. For this reason, even if the surface temperature of the material to be rolled is measured and the rolling leveling operation is performed in accordance with the width direction deviation, it is difficult to accurately correct the camber due to the width direction deformation resistance deviation of the material to be rolled. .
  The present invention has been made in view of the above circumstances, and can reliably suppress the occurrence of camber on the rolling mill exit side of the material to be rolled without measuring the temperature deviation in the width direction of the material to be rolled. An object of the present invention is to provide a reduction leveling control device and a reduction leveling control method.
  The present inventors diligently studied to suppress the occurrence of camber in a material to be rolled that has been rolled by a rolling mill (that is, the occurrence of camber on the exit side of the material to be rolled). As a result, “the tendency of the occurrence of camber due to the temperature deviation in the width direction of the material to be rolled is the strand cast by the casting machine to obtain the material to be rolled (hereinafter referred to as“ casting strand ”) and the material to be rolled in the hot rolling line. The knowledge that it can classify | categorize according to the heating furnace which heated the material, and the space | interval (henceforth "the distance between materials in a furnace") of the to-be-rolled material adjacent in this heating furnace was acquired. Based on the above findings, the inventors of the present invention are similar in the width direction temperature deviation between the materials to be rolled that can be considered to have the same distance between the casting strand, the heating furnace, and the in-furnace material. The rolling leveling amount during rolling of this material is controlled in consideration of the results of rolling leveling and camber amount of the rolled material (preceding material) that has been rolled with similar temperature deviation in the width direction. By doing so, it was found that the occurrence of camber on the exit side of the rolling mill of this material can be suppressed, and the present invention has been achieved.
  That is, in order to solve the above-described problems and achieve the object, the reduction leveling control device according to the present invention is a current rolling material among a plurality of rolled materials to be rolled by a rolling mill of a hot rolling line. An inlet camber amount measuring unit for measuring an inlet camber amount on an inlet side of the rolling mill, and a plurality of members on an outlet side of the rolling mill, for a material and a plurality of preceding materials rolled prior to the material. An exit-side camber amount measuring unit that measures the exit-side camber amount of the preceding material, and a measured strand of each of the plurality of preceding-material entrance-side camber amounts and exit-side camber amounts, at least a cast strand that cuts out the material to be rolled A storage unit that stores the strand identification information to be identified and the distance between the in-furnace materials, which is the distance in the width direction between the materials to be rolled adjacent to each other in the heating furnace that heats the material to be rolled; Based on the strand identification information and the inter-furnace material distance, a similar preceding material, which is a preceding material having a width direction temperature deviation similar to the present material, is selected from the plurality of preceding materials, and the memory Based on the measured values of the input side camber amount and the output side camber amount of the similar preceding material accumulated in the part, and the actual value of the reduction leveling amount at the time of rolling the similar preceding material, A camber influence coefficient indicating the degree to which the amount of reduction leveling during rolling affects the change in the camber amount before and after rolling of the similar preceding material is calculated, and the camber influence coefficient and the measured value of the inlet camber amount of the material are obtained. And an arithmetic processing unit that calculates a set value of a reduction leveling amount when assuming a predicted value of the delivery camber amount of the material on the delivery side of the rolling mill as a target value of the delivery camber amount, and the reduction Revelin Based on the amount of the set value, characterized by comprising a control unit for controlling the reduction leveling amount during rolling of the person wood.
  Further, in the above-described invention, the reduction leveling control device according to the present invention is characterized in that the arithmetic processing unit is configured to measure each measured value of the entrance-side camber amount and the exit-side camber amount of the similar preceding material and the rolling of the similar preceding material. Using the actual value of the leveling amount of the roll, the camber influence coefficient is calculated based on the following formula (1), and the camber influence coefficient and the measured value of the entrance camber amount of the material are used to calculate the following formula: Based on (2), a set value of the reduction leveling amount corresponding to the material is calculated.
Where Inf is the camber influence coefficient, CamA in is an actual measured value of the input side camber amount of the similar preceding material, CamA out is an actual measured value of the output side camber amount of the similar preceding material, and CamB in is The measured value of the entry side camber amount of the material, Lva is the actual value of the reduction leveling amount during rolling of the similar preceding material, and Lvb is the set value of the reduction leveling amount corresponding to the material. .
  Further, the reduction leveling control device according to the present invention, in the above invention, the control unit compares the set value of the reduction leveling amount with an upper limit value and a lower limit value of the reduction leveling amount of the rolling mill, When the setting value of the leveling amount is within the range between the upper limit value and the lower limit value of the rolling leveling amount, the rolling leveling amount during rolling of the material is controlled to the setting value of the rolling leveling amount, and the rolling leveling amount When the set value exceeds the upper limit value of the reduction leveling amount, the reduction leveling amount during rolling of the material is controlled to the upper limit value of the reduction leveling amount, and the set value of the reduction leveling amount is equal to the reduction leveling amount. When the value is below the lower limit value, the reduction leveling amount during rolling of the material is controlled to the lower limit value of the reduction leveling amount.
  Further, the reduction leveling control device according to the present invention is the above-described invention, wherein, in the above-described invention, when the plurality of heating furnaces are installed in the hot rolling line, the storage side camber amount of the plurality of preceding materials And the actual measured values of the exit-side camber amount are stored in association with the heating furnace specifying information for specifying each of the plurality of heating furnaces, the strand specifying information, and the distance between the in-furnace materials, and the arithmetic processing The section selects the similar preceding material from the plurality of preceding materials based on the heating furnace specifying information, the strand specifying information, and the distance between the in-furnace materials.
  Moreover, the reduction leveling control method according to the present invention is a plurality of preceding materials rolled prior to this material to be rolled this time among a plurality of rolled materials that are rolling targets of a rolling mill of a hot rolling line, Each measured value of the inlet camber amount on the inlet side and the outlet camber amount on the outlet side of the rolling mill, at least, strand specifying information for specifying a cast strand for cutting the material to be rolled, and a heating furnace for heating the material to be rolled A data accumulation step of accumulating in the storage unit in association with the distance between the in-furnace materials, which is the interval in the width direction between the materials to be rolled adjacent to each other, and the entry side camber of the material at the entry side of the rolling mill Based on the entrance camber amount measuring step for measuring the amount, and at least the strand identification information and the distance between the in-furnace materials, the width direction similar to the present material from among the plurality of preceding materials Select a similar preceding material that is a preceding material having a degree deviation, each measured value of the entrance side camber amount and the exit side camber amount of the similar preceding material accumulated in the storage unit, and at the time of rolling the similar preceding material Based on the actual value of the reduction leveling amount, a camber influence coefficient indicating the degree to which the reduction leveling amount during rolling of the similar preceding material affects the change in the camber amount before and after the rolling of the similar preceding material is calculated, and the camber When assuming the predicted value of the exit camber amount of the material on the exit side of the rolling mill as the target value of the exit camber amount based on the influence coefficient and the actual value of the entrance camber amount of the material A calculation processing step for calculating a set value of the reduction leveling amount, and a control step for controlling the reduction leveling amount during rolling of the material based on the set value of the reduction leveling amount. And butterflies.
  Further, the reduction leveling control method according to the present invention is the above-described invention, wherein the calculation processing step includes measuring each measured value of the input-side camber amount and the output-side camber amount of the similar preceding material, and rolling the similar preceding material. Using the actual value of the leveling amount of the rolling, based on the following formula (3), to calculate the camber influence coefficient, using the camber influence coefficient and the actual measured value of the inlet camber amount of the material, Based on (4), a set value of the reduction leveling amount corresponding to the material is calculated.
Where Inf is the camber influence coefficient, CamA in is an actual measured value of the input side camber amount of the similar preceding material, CamA out is an actual measured value of the output side camber amount of the similar preceding material, and CamB in is The measured value of the entry side camber amount of the material, Lva is the actual value of the reduction leveling amount during rolling of the similar preceding material, and Lvb is the set value of the reduction leveling amount corresponding to the material. .
  Further, the reduction leveling control method according to the present invention is the above invention, wherein the control step compares the set value of the reduction leveling amount with an upper limit value and a lower limit value of the reduction leveling amount of the rolling mill, When the setting value of the leveling amount is within the range between the upper limit value and the lower limit value of the rolling leveling amount, the rolling leveling amount during rolling of the material is controlled to the setting value of the rolling leveling amount, and the rolling leveling amount When the set value exceeds the upper limit value of the reduction leveling amount, the reduction leveling amount during rolling of the material is controlled to the upper limit value of the reduction leveling amount, and the set value of the reduction leveling amount is equal to the reduction leveling amount. When the value is below the lower limit value, the reduction leveling amount during rolling of the material is controlled to the lower limit value of the reduction leveling amount.
  Further, the reduction leveling control method according to the present invention is the above-described invention, wherein the data accumulation step is performed when the plurality of heating furnaces are installed in the hot rolling line, and the plurality of preceding material entry-side cambers. The actual measured values of the amount and the exit camber amount are stored in the storage unit in association with the heating furnace specifying information for specifying each of the plurality of heating furnaces, the strand specifying information, and the inter-furnace material distance. The calculation processing step selects the similar preceding material from the plurality of preceding materials based on the heating furnace specifying information, the strand specifying information, and the distance between the materials in the furnace. To do.
  According to the present invention, it is possible to reliably suppress the occurrence of camber on the exit side of the rolling material without measuring the temperature deviation in the width direction of the rolling material.
FIG. 1 is a diagram illustrating a configuration example of a reduction leveling control device according to an embodiment of the present invention. FIG. 2 is a diagram for explaining the reduction leveling amount of the rolling mill. FIG. 3 is a diagram for explaining the camber amount of the material to be rolled in the embodiment of the present invention. FIG. 4 is a diagram for explaining the similarity of the temperature deviation in the width direction between the rolled materials with respect to the heating furnace. FIG. 5 is a flowchart showing an example of the reduction leveling control method according to the embodiment of the present invention. FIG. 6 is a diagram illustrating a specific example of processing for selecting a similar preceding material similar to the current material from a plurality of the preceding materials according to the embodiment of the present invention. FIG. 7 is a diagram for explaining the control of the reduction leveling amount during rolling of this material in the embodiment of the present invention. FIG. 8 is a diagram showing the investigation results of Example 1 of the present invention in Example 1. FIG. 9 is a diagram illustrating the investigation result of Comparative Example 1 in Example 1. FIG. 10 is a diagram showing the investigation result of Example 2 of the present invention in Example 2. FIG. 11 is a diagram illustrating the investigation result of Comparative Example 2 in Example 2.
  Hereinafter, preferred embodiments of a rolling leveling control device and a rolling leveling control method according to the present invention will be described in detail with reference to the accompanying drawings. In the present embodiment, as an example of a rolling mill to which the present invention is applied, a rolling mill of a rough rolling apparatus in a hot rolling line is illustrated, but the present invention is not limited to the present embodiment. . Moreover, the drawings are schematic, and it should be noted that the relationship between the dimensions of each element, the ratio of each element, and the like may differ from the actual ones. Even between the drawings, there are cases in which portions having different dimensional relationships and ratios are included. Moreover, in each drawing, the same code | symbol is attached | subjected to the same component.
(Reduction leveling control device)
First, the configuration of the reduction leveling control device according to the embodiment of the present invention will be described. FIG. 1 is a diagram illustrating a configuration example of a reduction leveling control device according to an embodiment of the present invention. The rolling leveling control device 1 according to the present embodiment controls the rolling leveling amount of a rolling mill 11 that sequentially rolls a plurality of rolled materials in a hot rolling line, for example, as shown in FIG. A side camber amount measuring unit 2, an exit side camber amount measuring unit 3, a storage unit 4, an arithmetic processing unit 5, and a control unit 6 are provided.
  The entry-side camber amount measuring unit 2 measures the camber amount (hereinafter referred to as “entrance-side camber amount”) of the material to be rolled on the entry side of the rolling mill. In this Embodiment, the entrance side camber amount measurement part 2 is comprised using an imaging device etc., and as shown in FIG. 1, it arrange | positions at the entrance side of the rolling mill 11 which is a reduction leveling control object. The entry-side camber amount measuring unit 2 measures the entry-side camber amount on the entry side of the rolling mill 11 for the material 19 and the plurality of preceding materials 18 among the plurality of rolled materials that are rolling targets of the rolling mill 11. .
  Specifically, the entry-side camber amount measuring unit 2 optically detects the amount and direction of the camber of the material to be rolled conveyed to the entry side of the rolling mill 11 with an imaging device or the like, and the obtained material to be rolled. A predetermined image processing or the like is performed on the detection result of the camber. Thereby, the entry side camber amount measuring unit 2 measures the entry side camber amount of the material to be rolled on the entry side of the rolling mill 11. At this time, the entry-side camber amount measuring unit 2 distinguishes the direction of the camber of the material to be rolled on the entry side of the rolling mill 11 based on the positive and negative signs attached to the actually measured value of the entry-side camber amount. The entry-side camber amount measuring unit 2 sequentially performs the entry-side camber amount measurement process on the material to be rolled as described above for each of the plurality of preceding materials 18, thereby a plurality of preceding materials on the entry side of the rolling mill 11. Each 18 entrance side camber amount is measured in the rolling order (conveyance order). The entry-side camber amount measuring unit 2 performs the entry-side camber amount measurement process for the material to be rolled as described above on the material 19, thereby the entry-side camber of the material 19 on the entry side of the rolling mill 11. The amount is measured in the rolling order (the rolling order following the preceding preceding material among the plurality of preceding materials 18). As described above, the entrance-side camber amount measurement unit 2 controls the measured value of the obtained entrance-side camber amount each time the entry-side camber amounts of the material 19 and the plurality of preceding materials 18 are measured in the rolling order. 6 to send.
  The exit camber amount measuring unit 3 measures a camber amount (hereinafter referred to as “exit camber amount”) of the material to be rolled on the exit side of the rolling mill. In the present embodiment, the delivery-side camber amount measuring unit 3 is configured using an imaging device or the like, and is disposed on the delivery side of the rolling mill 11 that is a reduction leveling control target, as shown in FIG. The delivery-side camber amount measuring unit 3 is provided on the delivery side of the rolling mill 11 with respect to the material 19 after rolling by the rolling mill 11 and the plurality of preceding materials 18 among the plurality of rolled materials to be rolled by the rolling mill 11. Measure the exit camber amount at.
  Specifically, the exit-side camber amount measuring unit 3 sequentially performs the same measurement process as the above-described entrance-side camber amount measuring unit 2 for each of the plurality of preceding materials 18, thereby the exit side of the rolling mill 11. Are measured in the rolling order. Further, the exit-side camber amount measuring unit 3 performs the same measurement process as the above-described entry-side camber amount measuring unit 2 on the material 19 after rolling by the rolling mill 11, and thereby the material 19 after the rolling. The amount of camber is measured in the rolling order. Here, the material 19 after the rolling corresponds to the preceding material for the subsequent material to be rolled which is subsequently rolled by the rolling mill 11. Therefore, the exit camber amount measuring unit 3 measures the camber amount of the material 19 after the rolling as the exit camber amount of one preceding material on the exit side of the rolling mill 11. When the exit camber amount measuring unit 3 measures the exit camber amount as described above, the direction of the camber of the material to be rolled on the exit side of the rolling mill 11 is added to the measured value of the exit camber amount. It is distinguished by the sign of. The delivery-side camber amount measuring unit 3 obtains the delivery side obtained each time the exit-side camber amounts of the material 19 after rolling as one preceding material and the plurality of preceding materials 18 are measured in the rolling order as described above. The actual measured value of the camber amount is transmitted to the control unit 6.
  In the present embodiment, the material 19 is a material to be rolled at this time by the rolling mill 11 among a plurality of rolled materials that are sequentially conveyed along the conveying path 16 of the hot rolling line as a rolling object of the rolling mill 11. Rolled material. Each of the plurality of preceding materials 18 is a material to be rolled by the rolling mill 11 prior to the material 19 among the plurality of materials to be rolled. Such a plurality of preceding materials 18 include not only the immediately preceding preceding material that immediately precedes the current material 19 but also each preceding material that precedes the preceding preceding material immediately before (for example, all the preceding materials). Is also included. Examples of the plurality of materials to be rolled (the material 19 and the plurality of preceding materials 18) include steel materials such as slabs after being heated by a heating furnace (not shown) of a hot rolling line.
  The storage unit 4 stores various types of information necessary for controlling the reduction leveling amount of the rolling mill 11. For example, as shown in FIG. 1, the storage unit 4 stores a preceding material data table 4a. The preceding material data table 4a includes an incoming camber amount (actual value) of a plurality of preceding materials 18 measured by the entry-side camber amount measuring unit 2 and a plurality of preceding materials 18 measured by the exit-side camber amount measuring unit 3. This is a data table in which the output side camber amount (actually measured value) is associated with at least the strand identification information and the inter-furnace material distance of the plurality of preceding materials 18.
  In the preceding material data table 4a in the present embodiment, the actually measured values of the entrance side camber amount and the exit side camber amount of the plurality of preceding materials 18 are the rolling order and strands of the plurality of preceding materials 18 in the rolling mill 11. It is matched with specific information, heating furnace specific information, and the distance between materials in a furnace. Here, the rolling order of the plurality of preceding materials 18 is information for specifying each of the plurality of preceding materials 18. In the preceding material data table 4a, each of the plurality of preceding materials 18 is indicated by the rolling order. The strand identification information is information for identifying a cast strand from which the material to be rolled is cut. The heating furnace specifying information is information for specifying each of the plurality of heating furnaces when a plurality of heating furnaces for heating the material to be rolled are installed in the hot rolling line. The distance between the in-furnace materials is an interval in the width direction between the materials to be rolled adjacent in the heating furnace for heating the materials to be rolled. In the present embodiment, the storage unit 4 uses the measured values of the inlet camber amount and the outlet camber amount of the plurality of preceding materials 18 as described above, the rolling order, the strand specifying information, the heating furnace specifying information, and the in-furnace material. In association with the inter-distance, the preceding material data table 4a is stored and accumulated.
  The arithmetic processing unit 5 executes various arithmetic processes necessary for the rolling leveling control of the rolling mill 11 that rolls the material to be rolled. Specifically, the arithmetic processing unit 5 includes a plurality of preceding materials based on at least the strand identification information and the distance between the in-furnace materials (for example, the strand identification information, the in-furnace material distance, and the heating furnace identification information). A similar preceding material for the material 19 is selected from 18. In other words, the arithmetic processing unit 5 selects between the heating material used in the original casting strand and the furnace material in the heating furnace from the plurality of preceding materials 18 indicated by the rolling order in the preceding material data table 4a. The preceding material that is regarded as having the same distance as the current material 19 is selected as the similar preceding material. The similar preceding material is a preceding material having a temperature deviation in the width direction similar to that of the present material 19 among the plurality of preceding materials 18. In the present embodiment, “the width direction temperature deviation is similar” means that the width direction temperature deviation is the same between the rolled materials of interest (the same), and of course, the width direction temperature deviation is different in size and direction. Is included within a predetermined range.
  In addition, the arithmetic processing unit 5 includes the actual measured values of the entrance-side camber amount and the exit-side camber amount of the similar preceding material accumulated in the storage unit 4 and the actual value of the reduction leveling amount during rolling of the similar preceding material. Then, the camber influence coefficient Inf is calculated based on the following equation (5). The camber influence coefficient Inf is an influence coefficient indicating the degree to which the reduction leveling amount during rolling of the similar preceding material affects the change in the camber amount before and after the rolling of the similar preceding material.
In equation (5), the measured input camber amount CamA in is an actual measured value of the input camber amount of the similar preceding material measured by the input camber amount measuring unit 2. The actual output camber amount CamA out is an actual measured value of the output camber amount of the similar preceding material measured by the output camber amount measurement unit 3. The actual measured input camber amount CamA in and the actual measured output camber amount CamA out are stored in the storage unit 4 as part of the preceding material data table 4a. The reduction leveling actual amount Lva is an actual value of the reduction leveling amount during rolling of the similar preceding material, and is data known to the control unit 6. The arithmetic processing unit 5 reads the input side camber measured amount CamA in and the output side camber measured amount CamA out from the storage unit 4, and acquires the reduction leveling actual amount Lva from the control unit 6.
  Further, the arithmetic processing unit 5 predicts the exit camber amount of the material 19 on the exit side of the rolling mill 11 based on the above-described camber influence coefficient Inf and the actual value of the entrance camber amount of the material 19. Is set as the target value of the output camber amount, and the set value of the reduction leveling amount is calculated.
Here, since the similar preceding material and the material 19 described above have similar width direction temperature deviations, the width direction deformation resistance deviations are the same. For this reason, the degree of influence of the rolling leveling operation on the change in the camber amount before and after the rolling of the similar preceding material is the same as that of the material 19. Therefore, the predicted value of the exit camber amount of the material 19, that is, the predicted output camber amount CamB out corresponds to the measured value of the entrance camber amount of the material 19 on the entry side of the rolling mill 11 and the material 19. It can be calculated based on the following equation (6) on the basis of the set value of the reduction leveling amount and the camber influence coefficient Inf described above.
In equation (6), the actual measured value of the incoming camber CamB in is an actual measured value of the incoming camber amount of the material 19 measured by the incoming camber amount measuring unit 2. This incoming camber actual measurement amount CamB in is transmitted from the incoming camber amount measuring unit 2 to the control unit 6. The arithmetic processing unit 5 acquires the incoming camber measured amount CamB in from the control unit 6. The reduction leveling setting amount Lvb is a setting value of the reduction leveling amount corresponding to the material 19. The arithmetic processing unit 5 uses the reduction leveling set amount Lvb for the purpose of calculation.
In the present embodiment, the target is to set the exit camber amount of the material 19 on the exit side of the rolling mill 11 to zero. That is, the arithmetic processing unit 5 assumes that the target value of the exit camber amount of the material 19 is zero. In this case, the following equation (7) is obtained by rearranging the equation (6) by setting the exit side camber predicted amount CamB out of the material 19 that is the left side of the equation (6) to zero (CamB out = 0).
Based on the above-described camber influence coefficient Inf and the actual measured input camber camB in of the material 19, the arithmetic processing unit 5 outputs the material 19 on the exit side of the rolling mill 11 based on the equation (7). A reduction leveling setting amount Lvb for setting the side camber amount to the target value (= 0) is calculated. The arithmetic processing unit 5 transmits the obtained reduction leveling setting amount Lvb to the control unit 6 every time the reduction leveling setting amount Lvb is calculated corresponding to the material 19.
  The control unit 6 executes reduction leveling control of the rolling mill 11 that rolls the material to be rolled. In the present embodiment, the control unit 6 controls the reduction device 11a of the rolling mill 11 based on the set value of the reduction leveling amount calculated by the arithmetic processing unit 5 (the reduction leveling setting amount Lvb). The control unit 6 controls the amount of reduction leveled when the material 19 is rolled by the rolling mill 11 through the control of the reduction device 11a.
At this time, the control unit 6 compares the reduction leveling set amount Lvb with the reduction leveling upper limit Lv max and the reduction leveling lower limit Lv min of the rolling mill 11. The reduction leveling upper limit amount Lv max is an upper limit value of the operable reduction leveling amount determined from the structure of the rolling mill 11. The reduction leveling lower limit amount Lv min is a lower limit value of the operable reduction leveling amount determined from the structure of the rolling mill 11. Control unit 6, when reduction leveling set amount Lvb is within the range of the reduction leveling limit amount Lv max and reduction leveling lower amount Lv min, the reduction leveling amount during rolling of this wood 19, the reduction leveling set amount Lvb To control. Control unit 6, when the reduction leveling set amount Lvb exceeds the reduction leveling limit amount Lv max, controls the reduction leveling amount during rolling of those wood 19 to the pressing leveling Maximum amount Lv max. Control unit 6, when the reduction leveling set amount Lvb is below the reduction leveling limit amount Lv min, controls the reduction leveling amount during rolling of those wood 19 to the pressing leveling limit amount Lv min. In this manner, the control unit 6 has the absolute value of the output camber amount of the material 19 within the range between the rolling leveling upper limit Lv max and the rolling leveling lower limit Lv min of the rolling mill 11 (preferably zero value). ) To control the leveling level during rolling of the material 19.
  Further, the control unit 6 controls the storage unit 4 to store various data related to the plurality of preceding materials 18. Specifically, the control unit 6 acquires the actual values of the input camber amounts of the plurality of preceding materials 18 from the input camber amount measuring unit 2, and outputs the plurality of preceding materials 18 from the output camber amount measuring unit 3. Acquires the actual measured value of the side camber amount. Further, the control unit 6 acquires the rolling order, the strand identification information, the heating furnace identification information, and the inter-furnace material distance from the process computer 20. The control unit 6 determines the actual measured values of the entrance camber amount and the exit camber amount of the plurality of preceding materials 18, the strand specifying information from the process computer 20, the heating furnace specifying information, and the inter-furnace material distance, The plurality of preceding materials 18 are associated with each other in the rolling order. The control unit 6 thus determines the actual measured values of the entry-side camber amount and the exit-side camber amount associated with the rolling order of the plurality of preceding materials 18, the strand identification information, the heating furnace identification information, and the inter-furnace material distance. The storage unit 4 is controlled so as to be accumulated as the preceding material data table 4a.
  Furthermore, the control unit 6 provides various data regarding the material 19 to the arithmetic processing unit 5. Specifically, the control unit 6 obtains an actual value of the entry-side camber amount of the material 19 from the entry-side camber amount measurement unit 2, and from the process computer 20 the rolling order, strand identification information, and heating furnace of the material 19. Acquire specific information and distance between materials in the furnace. The control unit 6 associates the acquired actual measured value of the entry-side camber amount of the material 19, the strand identification information, the heating furnace identification information, and the inter-furnace material distance in the rolling order of the material 19, and performs an arithmetic process. Send to part 5.
  On the other hand, the conveyance path | route 16 is for conveying a some to-be-rolled material sequentially in a hot rolling line. The transport path 16 is configured using a plurality of transport rolls (not shown). The rolling mill 11 is an example of a rolling mill to be controlled in the present invention, and sequentially rolls a plurality of rolled materials exemplified by the plurality of preceding materials 18 and the current material 19 in the conveying order. For example, the rolling mill 11 is a rolling mill that constitutes a rough rolling apparatus that sequentially performs rough rolling on the plurality of materials to be rolled. Although not shown in particular in FIG. 1, this rough rolling apparatus is configured by arranging a plurality of rolling mills including a rolling mill 11 in parallel in the conveyance direction of the material to be rolled along the conveyance path 16.
  The rolling mill 11 has a pair of rolling rolls facing the thickness direction D1 of the material to be rolled with the conveyance path 16 in between. FIG. 1 illustrates a four-stage rolling mill 11 having a pair of rolling rolls and a pair of backup rolls, but in the present invention, the number of roll stages of the rolling mill 11 is not limited to four stages, Any desired number of stages may be used. Moreover, as shown in FIG. 1, the rolling mill 11 has a reduction device 11a. The reduction device 11 a adjusts the reduction leveling amount of the rolling mill 11. FIG. 2 is a diagram for explaining the reduction leveling amount of the rolling mill. In the present embodiment, the reduction leveling amount is defined as a difference in reduction amount (reduction level) between both ends in the roll axis direction of the rolling rolls 11b and 11c for rolling the material to be rolled 17, as shown in FIG. Is done.
  The process computer 20 is a computer that manages the hot rolling line. The process computer 20 determines and manages the rolling order, rolling conditions, properties, and the like of the material to be rolled in the hot rolling line. For example, the process computer 20 determines a cast strand from which a material to be rolled is cut out from a plurality of cast strands, and inputs information (strand specifying information) for specifying the determined cast strand to the control unit 6. Further, the process computer 20 determines a heating furnace for performing the heat treatment of the material to be rolled from among a plurality of heating furnaces in the hot rolling line, and specifies information (heating furnace specifying information) for specifying the determined heating furnace as a control unit. 6 Furthermore, the process computer 20 determines the heating conditions of the material to be rolled by the heating furnace (the heating temperature of the material to be rolled, the conveyance speed, the charging timing, the extraction timing, etc.), and the furnace determined based on the heating conditions of the material to be rolled. The distance between the inner materials is input to the control unit 6.
  Although not particularly shown in FIG. 1, a plurality of equipment such as a heating furnace is arranged on the upstream side of the conveying path 16 from the rough rolling apparatus including the rolling mill 11, and is transported more than the rough rolling apparatus. Equipment such as a finish rolling device is disposed downstream of the path 16. That is, a material to be rolled such as a slab cut out from a cast strand is charged into a heating furnace, heated to a desired temperature, and then extracted from the heating furnace. Thereafter, the material to be rolled is sequentially conveyed along the conveyance path 16 and is roughly rolled by the rolling mill 11 or the like of the rough rolling apparatus. The material to be rolled after rough rolling passes through various facilities of a hot rolling line such as a finish rolling device, and is then wound in a coil shape by a coiler.
(Camber amount of material to be rolled)
Next, the camber amount of the material to be rolled in the embodiment of the present invention will be described. FIG. 3 is a diagram for explaining the camber amount of the material to be rolled in the embodiment of the present invention. As shown in FIG. 3, the camber amount of the material to be rolled 17 (the plurality of preceding materials 18 and the material 19 described above) is the positive side or the negative side of the width direction D3 with respect to the longitudinal direction D2 of the material to be rolled 17 (see FIG. 3 is defined as the amount of bending on the positive side). Specifically, in the present embodiment, the camber amount is defined as the maximum value of the distance between the center position S1 in the width direction of the material 17 to be rolled and the reference position S2 of the material 17 to be rolled.
  As shown in FIG. 3, the reference position S2 is represented by a straight line (reference line) passing through the width direction center position Wa at the tip end portion 17a of the material to be rolled 17 and the width direction center position Wb at the tail end portion 17b. The In the example shown in FIG. 3, the camber amount is the distance between the center position S1 in the width direction at the center position in the longitudinal direction D2 of the material 17 to be rolled and the reference position S2.
  Further, the sign of the camber amount (the camber direction) is determined by the relationship between the direction of displacement of the center position S1 in the width direction with respect to the reference position S2 of the material to be rolled 17 and the width direction D3. In the example shown in FIG. 3, the center position S1 in the width direction is shifted to the positive side in the width direction D3 with respect to the reference position S2, so the camber amount becomes a positive value. Although not particularly illustrated, when the center position S1 in the width direction is shifted to the negative side in the width direction D3 with respect to the reference position S2, the camber amount becomes a negative value. The definition of the camber amount described above is the same for both the entrance-side camber amount and the exit-side camber amount of the plurality of preceding materials 18 and the present material 19 in the present embodiment.
  In the present embodiment, the thickness direction D1 is the thickness direction of the material to be rolled 17 exemplified by the plurality of preceding materials 18 and the material 19. The longitudinal direction D2 is the longitudinal direction of the material 17 to be rolled, and is the same as the transport direction of the plurality of preceding materials 18 and the current material 19 along the transport path 16. In the longitudinal direction D2, the tip side of the material to be rolled 17 is positive (forward direction), and the tail end side is negative (reverse direction). The width direction D <b> 3 is the width direction of the material to be rolled 17, and is the same as the roll axis direction of the transport rolls constituting the transport path 16 and the roll axis direction of each rolling roll of the rolling mill 11. In the width direction D3, for example, as shown in FIG. 3, the left side (working side) is positive and the right side (driving side) is negative toward the positive side in the longitudinal direction D2. These thickness direction D1, longitudinal direction D2, and width direction D3 are directions perpendicular to each other.
(Similarity of temperature deviation in the width direction between rolled materials)
Below, the similarity of the width direction temperature deviation of the to-be-rolled materials in this Embodiment is demonstrated. The similarity of the temperature deviation in the width direction between the rolled materials in the present embodiment is the viewpoint of the cast strand cut out from the rolled material, the viewpoint of the heating furnace that heated the rolled material, and the rolled material adjacent in the heating furnace. It is determined from the viewpoint of the interval in the width direction between the materials (distance between the materials in the furnace).
  In a plurality of cast strands sequentially manufactured by a continuous casting machine or the like, a cooling process by jetting cooling water is performed for solidification thereof. In the cooling treatment of the cast strand, when there is a distribution in the width direction of the cast strand in the amount or water pressure of the injected cooling water, a temperature deviation in the width direction occurs in the cast strand after the cooling treatment. The temperature deviation in the width direction of the cast strand is inherited by a material to be rolled such as a slab cut out from the cast strand. The temperature deviation in the width direction of the material to be rolled taken over from the casting strand remains even after being heated by the heating furnace of the hot rolling line, and becomes a cause of camber generation in the subsequent rolling process (particularly rough rolling process). . Although the temperature deviation in the width direction inherited from such a cast strand to the material to be rolled is different among a plurality of materials to be rolled each cut from different cast strands, a plurality of materials to be cut sequentially from the same cast strand are used. It can be considered the same between rolled materials.
  Moreover, the similarity of the temperature deviation in the width direction between the materials to be rolled is affected by the relative positional relationship between the materials to be rolled adjacent to each other in the heating furnace for heating the materials to be rolled. FIG. 4 is a diagram for explaining the similarity of the temperature deviation in the width direction between the rolled materials with respect to the heating furnace. In FIG. 4, heating furnaces 21 to 23 are an example of a plurality of heating furnaces installed in the hot rolling line in the present embodiment. FIG. 4 illustrates the relative positional relationship between the materials to be rolled 17 adjacent in the heating furnace 22.
  As shown in FIG. 4, the material to be rolled 17 that has been transported by the charging-side transport table is charged into the heating furnace 22 from a charging door (not shown) of the heating furnace 22. The respective rolled materials 17 charged in the heating furnace 22 are arranged so as to be adjacent to each other in the width direction D3, and are heated in the direction from the charging side to the extraction side (in the width direction D3 in FIG. 4). Conveyed in the negative direction). The material to be rolled 17 heated to a desired temperature by the heating furnace 22 is extracted from an extraction door (not shown) of the heating furnace 22, and then, for example, the rolling mill 11 shown in FIG. It is conveyed in the longitudinal direction D2 toward the side.
  In such a heating furnace 22, the end on the extraction side among the both ends in the width direction of the material to be rolled 17 is exposed to the atmosphere outside the heating furnace 22 by opening and closing the extraction door of the heating furnace 22. For this reason, among the width direction both ends of the to-be-rolled material 17 which exists in the heating furnace 22, the edge part by the side of extraction becomes low temperature compared with the edge part (namely, edge part by the side of charging) on the opposite side. . Due to this, the temperature deviation in the width direction generated in the material to be rolled 17 varies depending on the equipment specifications of the heating furnace 22, such as the furnace length, the temperature in the furnace, the material conveyance speed in the furnace, and the like. . This becomes a factor in which the temperature deviation in the width direction of each material to be rolled 17 is different between different heating furnaces (for example, between the three heating furnaces 21 to 23 shown in FIG. 4).
  On the other hand, each material to be rolled 17 charged in the same heating furnace 22 has a width direction temperature depending on the distance in the width direction D3 between the materials to be rolled adjacent in the furnace, that is, the distance between the materials in the furnace. Deviation occurs. For example, as shown in FIG. 4, when focusing on the material to be rolled 17-1 among the materials to be rolled 17-1 to 17-3 adjacent in the width direction D <b> 3 in the heating furnace 22, On the extraction side in the width direction D3, an inter-furnace material distance LA occurs. The in-furnace material distance LA is the distance between the material to be rolled 17-1 to be noticed and the material to be rolled 17-2 adjacent to the material to be rolled 17-1 on the extraction side in the width direction D3. Moreover, the distance LB between furnace materials has arisen in the insertion side of the width direction D3 of the to-be-rolled material 17-1. The in-furnace material distance LB is the distance between the material to be rolled 17-1 and the material to be rolled 17-3 adjacent to the material to be rolled 17-1 in the width direction D 3.
  Of the distances LA and LB between the in-furnace materials on both sides in the width direction of the material to be rolled 17-1, the distance between the in-furnace materials LA on the extraction side is the distance between the material to be rolled 17-1 and 17-2 into the heating furnace 22. It depends on each charging timing. The in-furnace material distance LB on the charging side is determined by the respective charging timings of the materials to be rolled 17-1 and 17-3 into the heating furnace 22. The respective charging timings of the rolled materials 17-1 to 17-3 into the heating furnace 22 are determined by the process computer 20 (see FIG. 1) described above. That is, the above-mentioned furnace material distances LA and LB are determined by the process computer 20. Moreover, all the to-be-rolled material 17 which exists in the heating furnace 22 is conveyed only the same distance toward the extraction side from the charging side of the heating furnace 22 simultaneously. Accordingly, the distances LA and LB between the in-furnace materials of each material to be rolled 17 are constant during a period from when the material is inserted into the heating furnace 22 until the material is extracted out of the heating furnace 22.
  Here, the end temperature on the extraction side of the material to be rolled 17-1 becomes higher as the distance between the material to be rolled 17-2 adjacent to the extraction side (distance LA in the furnace on the extraction side) increases. The smaller the temperature, the lower the temperature. Similarly, the end portion temperature on the charging side of the material to be rolled 17-1 is large in the interval between the materials to be rolled 17-3 adjacent to the charging side (in-furnace material distance LB on the charging side). The lower the temperature, the lower the temperature. Due to the temperature difference at both ends in the width direction of the material to be rolled 17-1 according to the distances LA and LB between the in-furnace materials, a temperature deviation in the width direction occurs in the material to be rolled 17-1. For example, in the material to be rolled 17-1 shown in FIG. 4, the distance LA in the furnace on the extraction side is larger than the distance LB in the furnace on the charging side. In this case, in the material to be rolled 17-1, the end temperature on the extraction side is higher than the end temperature on the charging side, and as a result, from the end on the extraction side to the end on the charging side. As a result, a temperature deviation in the width direction in which the temperature decreases and changes occurs.
  The temperature deviation in the width direction of each rolled material 17 due to the distances LA and LB between the in-furnace materials is such that both the in-furnace material distances LA and LB are between the respective rolled materials 17 in the same heating furnace 22. If it is the same level, it can be considered the same. On the other hand, even if it is each rolling material 17 which exists in the same heating furnace 22, if at least one of the distances LA and LB between furnace materials is not comparable, it originates in the distances LA and LB between furnace materials mentioned above. The temperature deviation in the width direction is different between the rolled materials 17. Therefore, the extraction-side inter-furnace material distance LA and the charging-side inter-furnace material distance LB are classified for each distance range in which the temperature deviation in the width direction is the same between the rolled materials 17.
  For example, if the end side temperature on the extraction side of the material to be rolled 17 is stabilized at a temperature T1 [° C.] within a predetermined error range when the distance LA in the furnace on the extraction side is less than 1 [m], the extraction side As the distance range of the inter-furnace material distance LA, “less than 1 [m]” is set. When the distance LA between the in-furnace materials on the extraction side is 1 [m] or more and less than 2 [m], the end temperature on the extraction side of the material to be rolled 17 is within a predetermined error range within the temperature T2 (≠ T1) [° C.]. If it is stable, the distance range of the inter-furnace material distance LA on the extraction side is set to “1 [m] or more and less than 2 [m]”. When the distance LA between the in-furnace materials on the extraction side is 2 [m] or more and less than 3 [m], the end temperature on the extraction side of the material to be rolled 17 is a predetermined temperature T3 (≠ T1, T2) [° C.]. If stable within the error range, “2 [m] or more and less than 3 [m]” is set as the distance range of the inter-furnace material distance LA on the extraction side. When the distance LA between the in-furnace materials on the extraction side is 3 [m] or more, the end temperature on the extraction side of the material to be rolled 17 is within a predetermined error range at a temperature T4 (≠ T1, T2, T3) [° C.]. If stabilized, “3 [m] or more” is set as the distance range of the distance LA between the in-furnace materials on the extraction side. In addition, the distance range of the charging-side inter-furnace material distance LB is also set in the same manner as the extraction-side inter-furnace material distance LA.
  As described above, the in-furnace material distance LA on the extraction side and the in-furnace material distance LB on the charging side are less than 1 [m], 1 [m] or more and less than 2 [m], 2 [ m] and less than 3 [m], and 3 [m] or more. The in-furnace material distance LA on the extraction side is classified into the same distance range (for example, 3 [m] or more) between the rolled materials 17, and the in-furnace material distance LB on the charging side is equal to each rolled material 17. Are classified into the same distance range (for example, less than 1 [m]), the temperature deviation in the width direction due to the distances LA and LB between the in-furnace materials is the same among the rolled materials 17.
  In the present embodiment, the similarity of the temperature deviation in the width direction between the rolled materials is the above-described three viewpoints, that is, whether the cast strands for cutting the rolled material are the same, heating for heating the rolled material. It is determined based on whether or not the furnaces are the same, and whether or not the distances LA and LB between the in-furnace materials in the heating furnace are classified into the same distance range. Specifically, between the material 19 and the plurality of preceding materials 18, the raw cast strand, the heating furnace used, and the distance ranges of the in-furnace distances LA and LB are all the same. It is determined that the materials (that is, the material 19 and the similar preceding material) have similar width direction temperature deviations.
(Driving leveling control method)
Next, a reduction leveling control method according to the embodiment of the present invention will be described. FIG. 5 is a flowchart showing an example of the reduction leveling control method according to the embodiment of the present invention. In the rolling-down leveling control method according to the embodiment of the present invention, the rolling-down leveling control device 1 (see FIG. 1) sequentially executes steps S101 to S104 shown in FIG.
  That is, as shown in FIG. 5, the reduction leveling control device 1 first rolls prior to the current material 19 to be rolled this time among a plurality of materials to be rolled that are rolling targets of the rolling mill 11 of the hot rolling line. The preceding material data for the plurality of preceding materials 18 that have been processed is accumulated (step S101).
  In step S <b> 101, the entry-side camber amount measuring unit 2 measures the entry-side camber amount of the preceding material immediately preceding the present material 19 among the plurality of preceding materials 18, and calculates an actual value of the entry-side camber amount. Transmit to the control unit 6. Next, the delivery-side camber amount measuring unit 3 measures the delivery-side camber amount of the immediately preceding preceding material (the camber amount after rolling by the rolling mill 11), and transmits the actual measured value of the delivery-side camber amount to the control unit 6. To do. The control unit 6 determines the actual measured values of the input side camber amount and the output side camber amount of the preceding material acquired from the input side camber amount measurement unit 2 and the output side camber amount measurement unit 3 respectively, and the process computer 20. The acquired strand specific information of the immediately preceding preceding material, heating furnace specific information, and the distances LA and LB between the furnace internal materials are associated with each other. In this way, the control unit 6 determines the measured values of the entry-side camber amount and the exit-side camber amount associated with the immediately preceding preceding material, the strand specification information, the heating furnace specification information, and the in-furnace material distances LA and LB. Are stored in the rolling order of the plurality of preceding materials 18.
  At the time of step S101, the storage unit 4 stores the preceding material data of each preceding material (each preceding material preceding the preceding preceding material) excluding the immediately preceding preceding material among the plurality of preceding materials 18. These have been already accumulated in the preceding material data table 4a along the rolling order of each preceding material. The preceding material data includes actual measured values of the incoming camber amount and the outgoing camber amount of the preceding material, strand specifying information, heating furnace specifying information, and distances LA and LB between the furnace materials. Based on the control of the control unit 6, the storage unit 4 newly accumulates the preceding material data of the immediately preceding preceding material in the preceding material data table 4 a along the rolling order of the plurality of preceding materials 18. In this way, the control unit 6 associates the actual measured values of the entrance-side camber amount and the exit-side camber amount with respect to the plurality of preceding materials 18 at least in the strand identification information and the distances LA and LB between the in-furnace materials in the rolling order. To be stored in the storage unit 4. For example, in the present embodiment in which a plurality of heating furnaces are installed in the hot rolling line, the control unit 6 obtains the actual measured values of the entrance camber amount and the exit camber amount of the plurality of preceding materials 18. Are stored in the storage unit 4 in association with the strand identification information, the heating furnace identification information, and the inter-furnace material distances LA and LB along the rolling order of the preceding material 18.
  After executing Step S101, the reduction leveling control device 1 measures the entry-side camber amount of the material 19 on the entry side of the rolling mill 11 (Step S102). In step S <b> 102, the entry-side camber amount measuring unit 2 measures the entry-side camber amount of the material 19 that has been conveyed to the entry side of the rolling mill 11 to be rolled this time by the rolling mill 11. The incoming camber amount measuring unit 2 transmits the obtained actual measured value of the incoming camber amount of the material 19 to the control unit 6.
  After executing step S102, the reduction leveling control device 1 calculates a set value of the reduction leveling amount corresponding to the material 19 (step S103). In step S103, the control unit 6 determines the actual value of the entry-side camber amount of the material 19 by the entry-side camber amount measurement unit 2 in step S102, at least the strand specifying information and the furnace of the material 19 obtained from the process computer 20. The distance between the inner materials LA and LB (in this embodiment, the rolling order of the material 19, the strand specifying information, the heating furnace specifying information, and the distance between the inner materials LA and LB) are associated with the arithmetic processing unit 5. Send. Then, the control unit 6 instructs the calculation processing unit 5 to calculate the reduction leveling amount corresponding to the material 19.
  Based on the instruction from the control unit 6 described above, the calculation processing unit 5 executes a calculation process of a reduction leveling amount corresponding to the material 19 in step S103. Specifically, the arithmetic processing unit 5 has a temperature deviation in the width direction similar to that of the material 19 out of the plurality of preceding materials 18 based on at least the strand identification information and the distances LA and LB between the materials in the furnace. Select a similar preceding material that is the preceding material. For example, in the present embodiment in which a plurality of heating furnaces are installed in the hot rolling line, the arithmetic processing unit 5 includes the preceding material data table 4 a read from the storage unit 4 and the current material 19 acquired from the control unit 6. While referring to various data, based on the strand identification information, the heating furnace identification information, and the distances LA and LB between the furnace materials, a similar preceding material similar to the material 19 is selected from the plurality of preceding materials 18. select.
  FIG. 6 is a diagram illustrating a specific example of processing for selecting a similar preceding material similar to the current material from a plurality of the preceding materials according to the embodiment of the present invention. In FIG. 6, the measured values of the entrance camber amount and the exit camber amount of the plurality of preceding materials 18 are associated with the strand specifying information, the heating furnace specifying information, the distances LA and LB between the in-furnace materials, and the rolling order. A specific example of the accumulated preceding material data table 4a is shown. FIG. 6 shows a specific example of the measured value of the entry side camber amount of the material 19, the strand identification information, the heating furnace identification information, the inter-furnace material distances LA and LB, and the rolling order.
  The arithmetic processing unit 5 refers to, for example, the preceding material data table 4a shown in FIG. 6 and various data of the material 19, and includes a plurality of strand specifying information, heating furnace specifying information, and in-furnace material distances LA and LB. The preceding material 18 and the present material 19 are compared. Thereby, the arithmetic processing unit 5 has the strand identification information coincides with the material 19 (cast strand coincides) from among the plurality of preceding materials 18, and the heating furnace identification information coincides with the material 19 (used heating furnace). ), And the preceding materials whose distances LA and LB between the furnace materials are classified in the same distance range as the current material 19 are selected as similar preceding materials.
  For example, the in-furnace material distances LA and LB in the present embodiment are less than 1 [m], 1 [m] or more and less than 2 [m], 2 [m] or more and less than 3 [m], 3 [m]. ] It is divided into the above four distance ranges. In this case, as a result of the comparison process between the plurality of preceding materials 18 and the material 19 illustrated in FIG. 6, the arithmetic processing unit 5 matches the strand identification information with “1” for the material 19, and the heating furnace The specific information matches with “2”, the extraction side inter-furnace material distance LA matches with “distance range of 3 [m] or more”, and the charging-side inter-furnace material distance LB is “1 [ The preceding material in the rolling order i that matches in the “distance range less than m]” is selected as the similar preceding material. Although not shown in particular in FIG. 6, among the plurality of preceding materials 18, the preceding material in which the strand specifying information, the heating furnace specifying information, and the distance ranges of the in-furnace material distances LA and LB coincide with the current material 19. When there are a plurality of candidates, the arithmetic processing unit 5 selects the preceding material in the rolling order closest to the rolling order N of the material 19 among the preceding materials as the plurality of candidates as the similar preceding material.
After selecting the similar preceding material as described above, the arithmetic processing unit 5 determines each measured value of the entry-side camber amount and the exit-side camber amount of the similar preceding material accumulated in the storage unit 4 and the rolling of the similar preceding material. The camber influence coefficient Inf is calculated based on the actual value of the amount of reduction leveling. At this time, the arithmetic processing unit 5 selects the input side camber measured amount CamA in and the output side camber measured amount CamA out of the similar preceding material from the preceding material data table 4a in the storage unit 4 (in FIG. 6, in the rolling order i). Each measured value of the preceding material entrance side camber amount and the exit side camber amount) is read out. In addition, the arithmetic processing unit 5 acquires the reduction leveling actual amount Lva of the similar preceding material from the control unit 6. The arithmetic processing unit 5 uses these input side camber measured amount CamA in , output side camber measured amount CamA out , and reduction leveling actual amount Lva, and based on the above-described equation (5), the camber corresponding to the similar preceding material The influence coefficient Inf is calculated.
After calculating the camber influence coefficient Inf as described above, the arithmetic processing unit 5 performs the calculation on the outlet side of the rolling mill 11 based on the camber influence coefficient Inf and the actual measured value of the inlet camber amount of the material 19. A set value of the reduction leveling amount when the predicted value of the exit camber amount of the material 19 is assumed as the target value of the exit camber amount is calculated. At this time, the arithmetic processing unit 5 assumes, for example, that the target value is zero, and the camber influence coefficient Inf and the measured input camber CamB in of the material 19 (the input side of the material 19 illustrated in FIG. 6). Based on the above-described equation (7), the reduction leveling setting amount Lvb corresponding to the material 19 is calculated using the measured value of the camber amount. The arithmetic processing unit 5 transmits the calculated reduction leveling setting amount Lvb to the control unit 6.
  After executing step S103 as described above, the reduction leveling control device 1 performs reduction leveling during rolling of the material 19 based on the set value of the reduction leveling amount calculated by the arithmetic processing unit 5 in step S103. The amount is controlled (step S104), and this process ends.
In step S <b> 104, the control unit 6 acquires the set value of the reduction leveling amount calculated by the arithmetic processing unit 5, that is, the reduction leveling setting amount Lvb corresponding to the material 19 from the arithmetic processing unit 5. The control unit 6 compares the acquired reduction leveling setting amount Lvb with the upper limit value (the reduction leveling upper limit amount Lv max ) and the lower limit value (the reduction leveling lower limit amount Lv min ) of the rolling mill 11. Control unit 6, based on the the reduction leveling set amount Lvb and reduction leveling limit amount Lv max and reduction leveling lower amount Lv min on a result of comparison process, the reduction leveling amount during rolling of those wood 19 in the rolling mill 11 Control.
FIG. 7 is a diagram for explaining the control of the reduction leveling amount during rolling of this material in the embodiment of the present invention. In FIG. 7, an orthogonal two-axis xy coordinate system takes the reduction leveling amount of the rolling mill 11 on the x axis and the exit camber amount of the material to be rolled on the exit side of the rolling mill 11 on the y axis. The straight lines F1 to F3 are lines shown in the xy coordinate system based on the above-described equation (6), that is, a straight line indicating a correlation between the reduction leveling set amount Lvb and the outgoing camber predicted amount CamB out for the material 19. It is. The inclinations of these straight lines F1 to F3 are each a camber influence coefficient Inf.
Within the reduction leveling set amount Lvb is the reduction leveling limit amount Lv max and reduction leveling lower amount Lv min, i.e., if it is within the lower limit range R LV on the reduction leveling amount, the straight line F1 is illustrated in FIG. 7, This is expressed in the xy coordinate system based on the above-described equation (6). In this case, reduction leveling set amount Lvb to the exit side camber predictor CamB out the zero value of this wood 19 (y = 0), as shown in FIG. 7, upper and lower limits of reduction leveling weight range values in R LV It becomes. That is, the reduction leveling set amount Lvb is a reduction leveling amount that can be operated in the reduction device 11 a of the rolling mill 11. Accordingly, the control unit 6, based on the reduction leveling set amount Lvb within lower range R LV on the reduction leveling amount, and controls the screw down device 11a, through this control, during the rolling of those wood 19 by the rolling mill 11 The reduction leveling amount is controlled to this reduction leveling set amount Lvb.
On the other hand, if the reduction leveling set amount Lvb exceeds the reduction leveling limit amount Lv max, linear F2 illustrated in FIG. 7, represented in the xy coordinate system on the basis of the equation (6) described above. In this case, reduction leveling set amount Lvb to the exit side camber predictor CamB out the zero value of this wood 19 (y = 0), as shown in FIG. 7, upper and lower limits of reduction leveling weight range R LV value outside Specifically, the value is larger than the rolling leveling upper limit Lv max . That is, the reduction leveling set amount Lvb is a reduction leveling amount that cannot be operated in the reduction device 11 a of the rolling mill 11. Under such circumstances, as illustrated in the straight line F2 in FIG. 7, the absolute value of the exit side camber predictors CamB out of those wood 19 in the lower limit range R LV on the reduction leveling amount (value of y-axis) reduction leveling amount to minimize will reduction leveling Maximum amount Lv max. Accordingly, the control unit 6 controls the screw down device 11a by replacing the reduction leveling set amount Lvb described above to the pressing leveling limit amount Lv max, through this control, the reduction leveling amount during rolling of this timber 19 by the rolling mill 11 The reduction leveling upper limit Lv max is controlled.
On the other hand, if the reduction leveling set amount Lvb is below the reduction leveling limit amount Lv min, linear F3 illustrated in FIG. 7, represented in the xy coordinate system on the basis of the equation (6) described above. In this case, reduction leveling set amount Lvb to the exit side camber predictor CamB out the zero value of this wood 19 (y = 0), as shown in FIG. 7, upper and lower limits of reduction leveling weight range R LV value outside Specifically, the value is smaller than the lowering leveling lower limit Lv min . That is, the reduction leveling set amount Lvb is a reduction leveling amount that cannot be operated in the reduction device 11 a of the rolling mill 11. Under such circumstances, as illustrated in a straight line F3 in FIG. 7, the absolute value of the exit side camber predictors CamB out of those wood 19 in the lower limit range R LV on the reduction leveling amount (value of y-axis) The reduction leveling amount that minimizes the reduction becomes the reduction leveling lower limit Lv min . Accordingly, the control unit 6 controls the screw down device 11a by replacing the reduction leveling set amount Lvb described above to the pressing leveling limit amount Lv min, through this control, the reduction leveling amount during rolling of this timber 19 by the rolling mill 11 The reduction leveling lower limit Lv min is controlled.
In step S104, as described above, the control unit 6, the absolute value of the output side camber amount of reduction leveling of the upper and lower limit range R LV within those wood 19 of the mill 11 is minimum (desirably zero value) Thus, the amount of reduction leveling during rolling of the material 19 in the rolling mill 11 is controlled.
  Note that the material 19 that has been rolled by the rolling mill 11 corresponds to the preceding material for the subsequent material to be rolled by the rolling mill 11 from now on. Such a material 19 is rolled by the rolling mill 11 while being sequentially transported along the transport path 16, and the exit camber amount on the exit side of the rolling mill 11 is measured by the exit camber amount measuring unit 3. Then, necessary processing in a hot rolling line such as rough rolling and finish rolling by various rolling mills in the subsequent stage is performed. The reduction leveling control device 1 repeatedly performs the processes of steps S101 to S104 described above every time the rolling of the material to be rolled by the rolling mill 11 is completed.
Example 1
Next, Example 1 of the present invention will be described. In Example 1, Inventive Example 1 was performed in order to verify the effect of the present invention. As conditions of Example 1 of the present invention, the material to be investigated has a material length (length in the longitudinal direction D2) of 8000 to 10000 [mm] and a material thickness (length in the thickness direction D1) of 235 [ mm], and a slab of mild steel having a material width (length in the width direction D3) of 1200 to 1400 [mm].
  The rolling mill to be controlled is a hot rolling having five four-stage rolling mills (configured similarly to the rolling mill 11 shown in FIG. 1) having a pair of rolling rolls and a pair of backup rolls. Among the rough rolling apparatuses of the line, the most upstream (first stand) rolling mill was used. The target plate thickness (set value) when rolling the material to be rolled by the rolling mill of the first stand was set to 200 to 210 [mm].
  Further, in Example 1 of the present invention, the reduction leveling control device had the same configuration as the reduction leveling control device 1 shown in FIG. 1 and was applied to the rolling mill of the first stand described above. Two cast strands were cut out from the material to be investigated, and three heating furnaces were installed in the hot rolling line. That is, from the plurality of preceding materials 18, the preceding material having the same distance range as the material 19 is selected as the strand specific information, the heating furnace specifying information, and the distances LA and LB between the in-furnace materials. . At this time, each distance range of the distances LA and LB in the furnace is less than 1 [m], 1 [m] or more and less than 2 [m], 2 [m] or more and less than 3 [m], 3 [m]. It was as above. The reduction leveling control device of Example 1 of the present invention repeatedly executes steps S101 to S104 shown in FIG. 5 each time the rolling mill of the first stand to be controlled rolls the material to be rolled, and the rolling of the first stand The reduction leveling amount when the machine rolled the material 19 was controlled.
  On the other hand, in Example 1, the comparative example 1 compared with the invention example 1 mentioned above was performed. In Comparative Example 1, a conventional reduction leveling control device was applied to the above-described first stand rolling mill. This conventional reduction leveling control device uses the reduction leveling amount set so that the roll gap of the rolling roll at the time of no load is equal in the roll axis direction before starting rolling, and is described above during rolling of the material to be rolled. The reduction leveling amount of the rolling mill of the first stand was controlled to be constant (that is, the initial value). In Comparative Example 1, other conditions were the same as those of Example 1 of the present invention.
  In each of Invention Example 1 and Comparative Example 1 described above, the rolling mill of the first stand as the control target sequentially rolls the material to be investigated (slab), and the rolling mill exit side of each slab after rolling The camber meter installed on the exit side of the rolling mill of the first stand was sequentially measured. In Example 1, for each of Invention Example 1 and Comparative Example 1, the frequency distribution of the camber amount of the slab to be examined on the rolling mill exit side of the first stand was examined.
  FIG. 8 is a diagram showing the investigation results of Example 1 of the present invention in Example 1. FIG. 8 shows the slab camber amount after rolling by the first stand rolling mill in Example 1 of the present invention, that is, the frequency distribution of the slab camber amount on the exit side of the first stand rolling mill. Has been. As shown in FIG. 8, in Example 1 of the present invention, the frequency distribution of the camber amount by rolling the slab was within the range of −60 [mm] to 60 [mm]. The standard deviation σ of the frequency distribution was 23 [mm].
  On the other hand, FIG. 9 is a diagram showing the investigation result of Comparative Example 1 in Example 1. FIG. 9 shows the frequency distribution of the slab camber amount on the exit side of the rolling mill of the first stand in Comparative Example 1. As shown in FIG. 9, in Comparative Example 1, the frequency distribution of the camber amount by rolling the slab has a range of −60 [mm] or more and 60 [mm] or less (the camber amount range in the present invention example 1). It was over and scattered. The standard deviation σ indicating this variation was 58 [mm].
  As can be seen by comparing FIGS. 8 and 9, in Example 1 of the present invention, the camber amount due to rolling of the slab can be reduced as compared with Comparative Example 1, and further, the variation in the camber amount is compared with that of Comparative Example 1. The variation of about 60 [%] could be greatly reduced. From this comparison result, it was found that Example 1 of the present invention was more effective than Example 1 in reducing the camber amount (camber suppression) on the slab exit side.
(Example 2)
Next, a second embodiment of the present invention will be described. In Example 2, Inventive Example 2 was performed in order to verify the effect of the present invention. As conditions of Example 2 of the present invention, the material to be investigated is a mild steel having a material length of 6000 to 9000 [mm], a material thickness of 250 [mm], and a material width of 800 to 1000 [mm]. The slab.
  The rolling mill to be controlled is a hot rolling having five four-stage rolling mills (configured similarly to the rolling mill 11 shown in FIG. 1) having a pair of rolling rolls and a pair of backup rolls. A line rough rolling machine was used. That is, five rolling mills from the first stand (uppermost stream) to the fifth stand (lowermost stream) constituting the rough rolling apparatus are controlled objects. The target plate thickness (set value) on the rolling mill exit side of the fifth stand when rolling the material to be rolled by this rough rolling apparatus was set to 30 to 35 [mm].
  Further, in Example 2 of the present invention, the reduction leveling control device has the same configuration as the reduction leveling control device 1 shown in FIG. 1, and the first stand, the second stand, the third stand, and the fourth that are the control targets. It was applied to each rolling mill of the stand and the fifth stand. Four cast strands were cut out from the material to be investigated, and three heating furnaces were installed in the hot rolling line. That is, from the plurality of preceding materials 18, the preceding material having the same distance range as the material 19 is selected as the strand specific information, the heating furnace specifying information, and the distances LA and LB between the in-furnace materials. . In addition, each distance range of the distances LA and LB between the in-furnace materials in the present invention example 2 was the same as that of the above-described invention example 1. Each reduction leveling control device of Example 2 of the present invention repeatedly executes steps S101 to S104 shown in FIG. 5 each time each rolling mill of the first to fifth stands to be controlled rolls the material to be rolled. Thus, the rolling leveling amounts when the rolling mills of the first stand to the fifth stand sequentially roll the material 19 were controlled.
  On the other hand, in Example 2, the comparative example 2 compared with the invention example 2 mentioned above was performed. In Comparative Example 2, each conventional rolling leveling control device was applied to each rolling mill of the first stand to the fifth stand described above. The control of the reduction leveling amount for each rolling mill of the first stand to the fifth stand by each conventional reduction leveling control device was made the same as in Comparative Example 1 described above. In Comparative Example 2, the other conditions were the same as in Invention Example 2.
  In each of Invention Example 2 and Comparative Example 2 described above, each rolling mill of the first to fifth stands as the control target sequentially rolls the material to be investigated (slab), and each slab after rolling. Each camber meter installed in the exit side of each rolling mill of the 1st stand-the 5th stand measured sequentially the amount of camber in the rolling mill exit side. In Example 2, for each of Invention Example 2 and Comparative Example 2, the frequency distribution of the camber amount of the slab to be investigated on the rolling mill exit side of these first to fifth stands was investigated.
  FIG. 10 is a diagram showing the investigation result of Example 2 of the present invention in Example 2. FIG. 10 shows the camber amount of the slab after the rolling by the rolling mills of the first stand to the fifth stand in Example 2 of the present invention, that is, the fifth stand for rolling the final rolling pass on the slab. The frequency distribution of the slab camber amount on the exit side of the rolling mill is shown. As shown in FIG. 10, in Example 2 of the present invention, the frequency distribution of the camber amount by rolling the slab was within the range of −60 [mm] to 80 [mm]. The standard deviation σ of the frequency distribution was 23 [mm].
  On the other hand, FIG. 11 is a diagram illustrating a result of investigation in Comparative Example 2 in Example 2. FIG. 11 illustrates the frequency distribution of the slab camber amount on the exit side of the fifth stand rolling mill in Comparative Example 2. As shown in FIG. 11, in Comparative Example 2, the frequency distribution of the camber amount by rolling the slab has a range of −60 [mm] or more and 80 [mm] or less (the camber amount range in the present invention example 2). It was over and scattered. The standard deviation σ indicating this variation was 56 [mm].
  As can be seen by comparing FIGS. 10 and 11, in Example 2 of the present invention, the camber amount due to rolling of the slab can be reduced as compared with Comparative Example 2, and further, the variation in the camber amount is compared with that of Comparative Example 2. The variation of about 59% was greatly reduced. Although not shown in FIGS. 10 and 11, in Example 2 of the present invention, the slab camber amount and its standard deviation σ (variation) on the delivery side of each rolling mill of the first stand to the fourth stand are the fifth. As in the case of the stand rolling mill, the amount could be reduced as compared with Comparative Example 2. From the above comparison results, in Example 2 of the present invention, the rolling leveling control device 1 described above is applied to each of a plurality of rolling mills arranged in the conveyance direction of the material to be rolled, so that each rolling of the slab is performed more than in Comparative Example 2. It was found that the camber amount on the exit side (camber suppression) is effective.
  As described above, in the embodiment of the present invention, among a plurality of rolled materials that are rolling targets of a controlled rolling mill, a plurality of preceding materials rolled prior to the current material that is about to be rolled. For each of the measured values of the entrance side camber amount and the exit side camber amount in the controlled rolling mill, the above-described strand identification information, heating furnace identification information, and the distance between the in-furnace materials are accumulated in the storage unit, Measure the entry-side camber amount of this material on the entry side of the rolling mill to be controlled, and based on the above-mentioned strand identification information, heating furnace identification information, the distance between the furnace inner materials, etc., from among these multiple preceding materials , Select a similar preceding material with a similar temperature deviation in the width direction to this material, each measured value of the entrance camber amount and the exit camber amount of the similar preceding material accumulated in the storage unit, and the rolling reduction of the similar preceding material during rolling Leveling amount Based on the value, the camber influence coefficient indicating the degree to which the amount of reduction leveling during rolling of the similar preceding material affects the change in the camber amount before and after rolling of the similar preceding material is calculated. Setting the amount of reduction level when the predicted value of the exit camber amount of the material on the exit side of the controlled rolling mill is assumed to be the target value of the exit camber amount based on the actual measured value of the entrance camber amount The value is calculated, and the reduction leveling amount during the rolling of the material by the controlled rolling mill is controlled based on the set value of the calculated reduction leveling amount.
  Therefore, without measuring the width direction temperature deviation of this material or the preceding material, the influence of the operation results of the reduction leveling amount on the actual change in the camber amount before and after rolling of the similar preceding material whose width direction temperature deviation is similar to this material Based on the degree, the rolling leveling operation according to the temperature deviation in the width direction of the material can be correctly performed when the material is rolled. As a result, the amount of camber during rolling due to the temperature deviation in the width direction of the material can be accurately reduced, and the amount of camber during rolling due to the deviation in the deformation resistance in the width direction of the material can be accurately reduced. In addition to this, by controlling the reduction leveling amount during rolling of this material based on the camber influence coefficient for the similar preceding material described above, the occurrence of camber during rolling of this material due to poor setting of the reduction leveling amount. It can be avoided. As a result, it is possible to reliably suppress the occurrence of camber on the rolling mill exit side of the material to be rolled without measuring the temperature deviation in the width direction of the material to be rolled.
  Further, in the embodiment of the present invention, the set value of the reduction leveling amount described above is compared with the upper limit value and the lower limit value of the reduction leveling amount of the controlled rolling mill, and the set value of the reduction leveling amount is set in the rolling mill to be controlled. When the rolling leveling amount is within the upper and lower limits, the rolling leveling amount during rolling of this material is controlled to the setting value of the rolling leveling amount, and the setting value of the rolling leveling amount is the upper limit of the rolling leveling amount of the controlled rolling mill. If this value is exceeded, the rolling leveling amount during rolling of this material is controlled to the upper limit value of this rolling leveling amount, and if the set value of the rolling leveling amount is below the lower limit value of the rolling leveling amount of the controlled rolling mill, this material The rolling leveling amount during rolling is controlled to the lower limit value of the rolling leveling amount.
  Thereby, the reduction leveling amount at the time of rolling of this material can be controlled so that the absolute value of the exit camber amount of this material is minimized within the upper and lower limits of the reduction leveling amount of the rolling mill to be controlled. As a result, the camber amount on the delivery side of the rolling material can be reduced as much as possible in consideration of the operation limit of the reduction leveling amount according to the equipment specifications of the rolling mill to be controlled.
  In the embodiment described above, based on the strand identification information, the heating furnace identification information, and the inter-furnace material distance between the rolled materials, the material 19 and the width direction temperature deviation among the plurality of preceding materials 18 are used. However, the present invention is not limited to this. In a hot rolling line equipped with a controlled rolling mill, when the number of heating furnaces for heating the material to be rolled is one, the heating furnace used for heating each of the plurality of preceding materials 18 and the material 19 is unambiguous. Is determined. In this case, the heating furnace specifying information may not be used when selecting the similar preceding material described above. Moreover, it is not necessary to associate the heating furnace specifying information with each measured value of the entrance side camber amount and the exit side camber amount of the plurality of preceding materials 18 accumulated in the storage unit 4, or the entrance side camber amount of the material 19. It is not necessary to associate the heating furnace specifying information with the actually measured value.
  That is, in the present invention, the arithmetic processing unit 5 may select a similar preceding material from among the plurality of preceding materials 18 based on at least the strand identification information and the distance between the in-furnace materials between the rolled materials. . The storage unit 4 stores and accumulates the measured values of the entrance-side camber amount and the exit-side camber amount of the plurality of preceding materials 18 in association with at least the strand identification information and the inter-furnace material distance between the rolled materials. May be. The control unit 6 may associate the measured value of the entry-side camber amount of the material 19 provided to the arithmetic processing unit 5 with at least the strand identification information and the distance between the in-furnace materials between the rolled materials.
  Moreover, in embodiment mentioned above, when the arithmetic processing part 5 calculates the setting value of the reduction leveling amount corresponding to this material 19, prediction of the exit side camber amount of this material 19 in the exit side of a controlled rolling mill. The value is assumed to be a zero value as the target value of the output camber amount, but the present invention is not limited to this. When calculating the set value of the rolling leveling amount corresponding to the material 19, the arithmetic processing unit 5 calculates the output side camber amount assumed as the predicted value of the output side camber amount of the material 19 on the output side of the controlled rolling mill. The target value may be a desired value other than zero.
  Furthermore, in the above-described embodiment, the distance range for classifying the distance between the materials in the furnace between the rolled materials is less than 1 [m], 1 [m] or more and less than 2 [m], 2 [m] or more and Although the four distance ranges of less than 3 [m] and 3 [m] or more are illustrated, the present invention is not limited to this. The distance between the materials in the furnace between the rolled materials may be divided into two or more (plural) distance ranges, and the upper limit value, lower limit value, and boundary value of each distance range are in the width direction of the rolled material. It may be set to a desired value in consideration of the correlation between the temperature deviation and the distance between the materials in the furnace between the rolled materials.
  Moreover, in embodiment mentioned above, although the rolling mill of the rough rolling apparatus was illustrated as a control object rolling mill, this invention is not limited to this. The controlled rolling mill may be a rolling mill other than the rough rolling apparatus, such as a finish rolling apparatus.
  Furthermore, in embodiment mentioned above, although the four-stage type rolling mill 11 provided with a pair of rolling roll and a pair of backup roll was illustrated as a control object rolling mill, this invention is limited to this. is not. The number of roll stages of the rolling mill to be controlled may be other than 4 and is not particularly limited in the present invention.
  In the embodiment described above, the camber amount of the material to be rolled that bends to the work side is a positive value, and the camber amount of the material to be rolled that bends to the drive side is a negative value, but the present invention is limited to this. Is not to be done. In the present invention, the positive / negative definition of the camber amount (that is, the definition of the camber direction) may be opposite to that described above (the working side is negative and the driving side is positive).
  Furthermore, in embodiment mentioned above, although the strand specific information and the heating furnace specific information were represented by the number, this invention is not limited to this. Each of the strand identification information and the furnace identification information may be expressed in a desired form, such as a character such as a number, an alphabetic character, or a symbol, or a character string combining at least two of these.
  Further, the present invention is not limited by the above-described embodiment, and the present invention includes a configuration in which the above-described constituent elements are appropriately combined. In addition, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on the above-described embodiments are all included in the scope of the present invention.
DESCRIPTION OF SYMBOLS 1 Rolling down leveling control apparatus 2 Input side camber amount measurement part 3 Outlet side camber amount measurement part 4 Memory | storage part 4a Prior material data table 5 Arithmetic processing part 6 Control part 11 Rolling mill 11a Rolling apparatus 11b, 11c Rolling roll 16 Conveyance path 17, 17-1 to 17-3 Rolled material 17a Tip portion 17b Tail end portion 18 Multiple preceding materials 19 Current material 20 Process computer 21-23 Heating furnace D1 Thickness direction D2 Longitudinal direction D3 Width direction S1 Width direction center position S2 Reference Position Wa Center position in the width direction (tip of rolled material)
Wb Center position in the width direction (tail end of the material to be rolled)

Claims (8)

  1. Among the plurality of materials to be rolled in the rolling mill of the hot rolling line, the present material to be rolled this time and the plurality of preceding materials to be rolled prior to the material, the entry side of the rolling mill An input camber amount measuring unit for measuring the input camber amount;
    An exit camber amount measuring unit for measuring an exit camber amount of the plurality of preceding materials on the exit side of the rolling mill;
    The measured values of the input side camber amount and the output side camber amount of the plurality of preceding materials are adjacent to each other at least inside the heating furnace that heats the material to be rolled, and strand specifying information for specifying a cast strand from which the material to be rolled is cut. A storage unit that accumulates in correspondence with the distance between the in-furnace materials, which is the interval in the width direction between the matching rolled materials,
    Based on at least the strand identification information and the inter-furnace material distance, from among the plurality of preceding materials, select a similar preceding material that is a preceding material having a width direction temperature deviation similar to the present material, Based on the actually measured values of the entrance-side camber amount and the exit-side camber amount of the similar preceding material accumulated in the storage unit, and the actual value of the reduction leveling amount at the time of rolling of the similar preceding material, the similar preceding material Calculate a camber influence coefficient indicating the degree to which the reduction leveling amount during rolling of the material affects the camber amount change before and after the rolling of the similar preceding material, and the measured value of the camber influence coefficient and the entrance camber amount of the material Based on the calculation processing unit to calculate the set value of the reduction leveling amount when assuming the predicted value of the exit camber amount of the material on the exit side of the rolling mill as a target value of the exit camber amount;
    Based on the set value of the rolling leveling amount, a control unit for controlling the rolling leveling amount during rolling of the material,
    A reduction leveling control device comprising:
  2. The arithmetic processing unit uses each measured value of the entry-side camber amount and the exit-side camber amount of the similar preceding material and the actual value of the reduction leveling amount during rolling of the similar preceding material, and uses the following formula (1): Based on the following equation (2), the reduction leveling amount corresponding to the material is calculated based on the camber influence coefficient and the measured value of the input camber amount of the material. The reduction leveling control device according to claim 1, wherein the set value is calculated.
    Where Inf is the camber influence coefficient, CamA in is an actual measured value of the input side camber amount of the similar preceding material, CamA out is an actual measured value of the output side camber amount of the similar preceding material, and CamB in is The measured value of the entry side camber amount of the material, Lva is the actual value of the reduction leveling amount during rolling of the similar preceding material, and Lvb is the set value of the reduction leveling amount corresponding to the material. .
  3.   The control unit compares a set value of the reduction leveling amount with an upper limit value and a lower limit value of the reduction leveling amount of the rolling mill, and the set value of the reduction leveling amount is an upper limit value and a lower limit value of the reduction leveling amount. The rolling leveling amount during rolling of the material is controlled to the set value of the rolling leveling amount, and when the setting value of the rolling leveling amount exceeds the upper limit value of the rolling leveling amount, When the rolling leveling amount during rolling of the material is controlled to the upper limit value of the rolling leveling amount, and the set value of the rolling leveling amount is less than the lower limit value of the rolling leveling amount, the rolling leveling amount during rolling of the material is set to The reduction leveling control device according to claim 1, wherein the reduction leveling control device is controlled to a lower limit value of the reduction leveling amount.
  4. In the case where a plurality of the heating furnaces are installed in the hot rolling line, the storage unit stores the measured values of the inlet camber amount and the outlet camber amount of the plurality of preceding materials. Accumulated in association with the heating furnace identification information for identifying each, the strand identification information, and the distance between the materials in the furnace,
    The arithmetic processing unit selects the similar preceding material from the plurality of preceding materials based on the heating furnace specifying information, the strand specifying information, and the inter-furnace material distance. Item 4. The reduction leveling control device according to any one of Items 1 to 3.
  5. Of a plurality of rolled materials to be rolled by a rolling mill of a hot rolling line, for a plurality of preceding materials rolled prior to the current material to be rolled this time, an entry-side camber amount on the entry side of the rolling mill and Each measured value of the exit-side camber amount on the exit side is at least the strand specifying information that identifies the cast strand from which the material to be rolled is cut, and the width direction of the materials to be rolled adjacent in the heating furnace that heats the material to be rolled A data accumulating step for accumulating in the storage unit in association with the distance between the in-furnace materials, which is
    Entry side camber amount measuring step for measuring the entry side camber amount of the material on the entry side of the rolling mill;
    Based on at least the strand identification information and the inter-furnace material distance, from among the plurality of preceding materials, select a similar preceding material that is a preceding material having a width direction temperature deviation similar to the present material, Based on the actually measured values of the entrance-side camber amount and the exit-side camber amount of the similar preceding material accumulated in the storage unit, and the actual value of the reduction leveling amount at the time of rolling of the similar preceding material, the similar preceding material Calculate a camber influence coefficient indicating the degree to which the reduction leveling amount during rolling of the material affects the camber amount change before and after the rolling of the similar preceding material, and the measured value of the camber influence coefficient and the entrance camber amount of the material Based on the calculation processing step of calculating the set value of the reduction leveling amount when the predicted value of the delivery camber amount of the material on the delivery side of the rolling mill is assumed as the target value of the delivery camber amount;
    Based on the set value of the rolling leveling amount, a control step for controlling the rolling leveling amount during rolling of the material,
    A reduction leveling control method comprising:
  6. The calculation processing step uses each measured value of the entrance-side camber amount and the exit-side camber amount of the similar preceding material and the actual value of the reduction leveling amount at the time of rolling of the similar preceding material. Based on the following equation (4), the reduction leveling amount corresponding to the material is calculated based on the camber influence coefficient and the measured value of the entry side camber amount of the material. The rolling reduction leveling control method according to claim 5, wherein the set value is calculated.
    Where Inf is the camber influence coefficient, CamA in is an actual measured value of the input side camber amount of the similar preceding material, CamA out is an actual measured value of the output side camber amount of the similar preceding material, and CamB in is The measured value of the entry side camber amount of the material, Lva is the actual value of the reduction leveling amount during rolling of the similar preceding material, and Lvb is the set value of the reduction leveling amount corresponding to the material. .
  7.   The control step compares a set value of the rolling leveling amount with an upper limit value and a lower limit value of the rolling leveling amount of the rolling mill, and the setting value of the rolling leveling amount is an upper limit value and a lower limit value of the rolling leveling amount. The rolling leveling amount during rolling of the material is controlled to the set value of the rolling leveling amount, and when the setting value of the rolling leveling amount exceeds the upper limit value of the rolling leveling amount, When the rolling leveling amount during rolling of the material is controlled to the upper limit value of the rolling leveling amount, and the set value of the rolling leveling amount is less than the lower limit value of the rolling leveling amount, the rolling leveling amount during rolling of the material is set to The reduction leveling control method according to claim 5 or 6, wherein the lowering leveling amount is controlled to a lower limit value.
  8. In the data accumulation step, when a plurality of the heating furnaces are installed in the hot rolling line, the measured values of the inlet camber amount and the outlet camber amount of the plurality of preceding materials are obtained as the plurality of heating furnaces. Each of the heating furnace specifying information, the strand specifying information, and the distance between the in-furnace materials is stored in the storage unit,
    The calculation processing step selects the similar preceding material from the plurality of preceding materials based on the heating furnace specifying information, the strand specifying information, and the distance between the in-furnace materials. Item 8. The reduction leveling control method according to any one of Items 5 to 7.
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