Rolling control device, rolling control method and procedure

Abstract

This invention relates to a rolling control device, a rolling control method, and a procedure. The rolling control device (10) is based on timing (t). a ~t b The actual value of the operation is used to update the preset load value (P). set The rolling control device (10) is based on timing (t). b ~t c The plasticity coefficient (Q) is derived from the actual value of the work. chk The rolling control device (10) operates based on the plasticity coefficient (Q). chk The result is determined to be that the updated preset load value (P) needs to be updated. set In the case of a further update, based on a timer (t) b ~t c The actual value of the operation is used to update the preset load value (P) again. set ).

Description

Technical Field

[0001] This invention relates to rolling control devices, rolling control methods, and procedures, and is particularly suitable for controlling the operation of tempering rolling mills. This application claims priority to Japanese Patent Application No. 2020-184290, filed on November 4, 2020, the entire contents of which are incorporated herein by reference. Background Technology

[0002] In a continuous cold-rolled steel sheet production line, the tail end of a preceding steel sheet is welded to the front end of a subsequent steel sheet. Multiple steel sheets joined by welding undergo continuous annealing and continuous quenching and tempering rolling. During this process, the elongation of the steel sheet is controlled based on the rolling load in the quenching and tempering mill. In this control, after the steel sheet passes through the quenching and tempering mill at the welded section, the rolling process is either interrupted (mill open) or the quenching and tempering mill is lightly pressed down, and after the welded section of the steel sheet passes through the quenching and tempering mill, control based on the aforementioned rolling load is restarted. In this case, it is desirable that after the elongation control based on the rolling load is restarted, the elongation of the steel sheet reaches the target value within a short period of time.

[0003] Patent Document 1 discloses the following technique. First, when the actual value of the elongation of the steel plate deviates significantly from the target value, a correction amount for the rolling load used to correct the preset rolling load is derived. Based on the plasticity coefficient at a time before the actual value of the rolling load of the quenching and tempering mill becomes the preset rolling load and the entry plate thickness, the correction amount for the rolling load is derived. Then, the quenching and tempering mill presses down the steel plate so that the rolling load of the quenching and tempering mill becomes the rolling load obtained by adding the correction amount to the preset rolling load.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2002-282922

[0007] Non-patent literature

[0008] Non-Patent Literature 1: Takeaki Kubo and Akiyoshi Kosaka, "Computer Control Systems for Steel Plants", Hitachi Review, Vol. 58, No. 6, June 1976. Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] However, in the technology described in Patent Document 1, the plasticity coefficient of the steel plate is estimated based on the actual value of the rolling load of the tempering mill before it becomes the preset rolling load. Therefore, if the plasticity coefficient of the steel plate at the time when the tempering mill reduces the steel plate to become the corrected rolling load deviates from the estimated plasticity coefficient, the desired elongation cannot be achieved even if the tempering mill reduces the steel plate to become the corrected rolling load. In particular, if the estimated plasticity coefficient of the steel plate is too large compared to the actual plasticity coefficient, the reduction becomes excessive when the tempering mill reduces the steel plate to become the corrected rolling load. Consequently, the elongation of the steel plate becomes excessive relative to the target value. Therefore, the elongation of the steel plate may not converge to or near the target value in a short time. Furthermore, in steel plates where the plasticity coefficient varies significantly with the reduction rate (elongation), the aforementioned deviation of the plasticity coefficient becomes larger. Therefore, when the technology described in Patent Document 1 is applied to such a steel plate, the time required for the elongation of the steel plate to converge to or near the target value may actually become longer.

[0011] The present invention was made in view of the above-mentioned problems, and its purpose is to shorten the time required for the elongation of the steel plate to converge to or near the target value.

[0012] Methods for solving problems

[0013] The rolling control device of the present invention is designed to derive a preset load value and output a pressing command based on the preset load value so that the elongation of the metal sheet at the welded part after passing through a tempering mill in a state of interrupted rolling or under light pressure is at a target value or within a target range. The device is characterized by comprising: a first preset load update unit that derives an update value of the preset load based on the actual working value during a first period from a first timing to a second timing; an evaluation index export unit that exports an evaluation index representing the difference between the plasticity coefficient of the metal sheet during the first period and the plasticity coefficient of the metal sheet during a second period from the second timing to a third timing; and a determination unit that determines, based on the evaluation index exported by the evaluation index export unit, whether it is necessary to update the preset load value again. The load update unit outputs the preset load update value; and the second preset load update unit, when the determination unit determines that the preset load update value output by the first preset load update unit needs to be updated again, outputs the preset load update value again based on the actual operation value during the second period. The preset load is the rolling load preset as the target rolling load of the quenching and tempering mill. The first timing is a timing earlier than the timing when the measured value of the rolling load of the quenching and tempering mill becomes the preset load. The second timing is the timing when the measured value of the rolling load of the quenching and tempering mill becomes the preset load. The third timing is the timing before the measured value of the rolling load of the quenching and tempering mill becomes the preset load update value output by the first preset load update unit.

[0014] The rolling control method of the present invention is characterized by comprising: a first preset load update step, which derives an updated value of the preset load based on the actual working value during a first period from a first time to a second time; an evaluation index derives an evaluation index that is the difference between the plasticity coefficient of the metal plate during the first period and the plasticity coefficient of the metal plate during the second period from the second time to the third time; and a determination step, which determines whether it is necessary to update the preset load again based on the evaluation index derived by the evaluation index derived by the first preset load update step. The load update process derives the aforementioned preset load update value; and the second preset load update process, when the determination process determines that the preset load update value derived from the first preset load update process needs to be updated again, derives the preset load update value again based on the actual operation value in the second period, wherein the preset load is the rolling load preset as the target rolling load of the quenching and tempering mill, the first timing is a timing earlier than the timing when the measured value of the rolling load of the quenching and tempering mill becomes the preset load, the second timing is the timing when the measured value of the rolling load of the quenching and tempering mill becomes the preset load, and the third timing is the timing before the measured value of the rolling load of the quenching and tempering mill becomes the preset load update value derived from the first preset load update process.

[0015] The program of the present invention is used to cause a computer to perform the following processing: in order to ensure that the elongation of the metal sheet at the welded part of the metal sheet is within a target value or target range after passing through a tempering mill in a state of interrupted rolling or light pressure, a preset load value is derived, and a pressing command based on the preset load value is output. The program is characterized by causing the computer to execute the following steps: a first preset load update step, which derives an updated value of the preset load based on the actual working value during a first period from a first timing to a second timing; an evaluation index derives an evaluation index of the difference between the plasticity coefficient of the metal sheet during the first period and the plasticity coefficient of the metal sheet during a second period from the second timing to a third timing; and a determination step, which determines whether further adjustments are needed based on the evaluation index derived by the evaluation index derived ... The updated value of the preset load derived from the first preset load update process; and the second preset load update process, when the determination process determines that the updated value of the preset load derived from the first preset load update process needs to be updated again, derives a new updated value of the preset load based on the actual operation value in the second period, wherein the preset load is a rolling load preset as the target rolling load of the quenching and tempering mill, the first timing is a timing earlier than the timing when the measured value of the rolling load of the quenching and tempering mill becomes the preset load, the second timing is the timing when the measured value of the rolling load of the quenching and tempering mill becomes the preset load, and the third timing is the timing before the measured value of the rolling load of the quenching and tempering mill becomes the updated value of the preset load derived from the first preset load update process. Attached Figure Description

[0016] Figure 1 This is a diagram showing an example of a heat treatment rolling mill.

[0017] Figure 2 This is a diagram illustrating an example of a heat-rolling process.

[0018] Figure 3 This is a diagram illustrating the technical problem described in Patent Document 1.

[0019] Figure 4 This is the first example of a diagram illustrating the functional configuration of a rolling control device.

[0020] Figure 5A This is a flowchart illustrating an example of a rolling control method.

[0021] Figure 5B It means to continue Figure 5A The first example of the flowchart.

[0022] Figure 6 This is a diagram illustrating a conceptual example of the processing of a rolling control device.

[0023] Figure 7 This is the second example of a diagram illustrating the functional configuration of a rolling control device.

[0024] Figure 8 It means to continue Figure 5A The second example of the flowchart.

[0025] Figure 9 This is a graph showing the results of a numerical simulation of rolling load and elongation.

[0026] Figure 10 This is a diagram illustrating an example of the hardware configuration of a rolling control device. Detailed Implementation

[0027] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0028] In addition, when the comparison objects are the same in terms of length, position, size, and spacing, in addition to the case of strict sameness, it also includes the case of differences within the scope of the invention (for example, the case of differences within the tolerance range determined at the time of design).

[0029] (First Embodiment)

[0030] First, the first embodiment will be described.

[0031] <Composition of Tempering and Heat Rolling Equipment>

[0032] Figure 1 This is a diagram showing an example of a heat treatment rolling equipment (rolling system).

[0033] The quenching and tempering mill 1 performs quenching and tempering rolling on a steel plate M, which is an example of a metal plate. The quenching and tempering mill 1 has, for example, a pair of work rolls and a pair of support rolls.

[0034] The pressing position control device 2 controls the pressing position of the tempering mill 1 based on the pressing command from the rolling control device 10.

[0035] Force sensor 3 measures the load (so-called rolling load) on the tempering mill 1.

[0036] The inlet tension gauge 4a measures the inlet tension of steel plate M. The inlet tension of steel plate M is the tension of steel plate M on the inlet side of the quenching and tempering mill 1.

[0037] The exit tension gauge 4b ​​measures the exit tension of the quenching and tempering mill 1. The exit tension of steel plate M is the tension of steel plate M on the exit side of the quenching and tempering mill 1.

[0038] The inlet tension roll 5a is a roll used to convey the steel plate M towards the quenching and tempering mill 1 by restricting the conveying direction of the steel plate M conveyed from the upstream side.

[0039] The exit tension roll 5b is a roll used to convey the steel plate M downstream by restricting the conveying direction of the steel plate M after it has been tempered and rolled by the tempering mill 1.

[0040] Motors 6a to 6d are motors used to rotate the inlet tension roll 5a. Reducers 7a, 7b, 7c, and 7d are arranged between motors 6a, 6b, 6c, and 6d and each roll of the inlet tension roll 5a. A pulse generator is installed on motors 6a to 6d. The pulse generator generates pulse signals based on the rotation of motors 6a to 6d. In this embodiment, the case of measuring the inlet speed V1 of the steel plate M based on the pulse signal generated by this pulse generator is illustrated. The inlet speed V1 of the steel plate M is the speed of the steel plate M entering the tempering mill 1. However, the inlet speed V1 of the steel plate M can also be measured by a plate speed gauge.

[0041] Electric motor 6e is used to rotate the work rolls of the quenching and tempering mill 1. A speed reducer 7e is disposed between electric motor 6e and the work rolls of the quenching and tempering mill 1. A pulse generator is installed in electric motor 6e.

[0042] Motors 6f to 6i are motors used to rotate the exit-side tension roll 5b. Reducers 7f, 7g, 7h, and 7i are arranged between motors 6f, 6g, 6h, and 6i and each roll of the exit-side tension roll 5b. A pulse generator is installed in motors 6f to 6i. In this embodiment, the exit-side speed V2 of the steel plate M is measured based on the pulse signal generated by this pulse generator. The exit-side speed V2 of the steel plate M is the speed of the steel plate M exiting from the tempering mill 1. However, the exit-side speed V2 of the steel plate M can also be measured by a plate speed gauge.

[0043] Speed ​​control devices 8a, 8b, 8c, and 8d control the rotational speeds of motors 6a, 6b, 6c, and 6d, respectively. For example, speed control devices 8a, 8b, 8c, and 8d control the rotational speeds of motors 6a, 6b, 6c, and 6d so that the rotational speeds of motors 6a, 6b, 6c, and 6d correspond to the set speed of the steel plate M's entry speed V1.

[0044] The speed control device 8e controls the rotational speed of the motor 6e based on the speed command output from the tension control device 9a.

[0045] Speed ​​control devices 8f, 8g, 8h, and 8i control the rotational speeds of motors 6f, 6g, 6h, and 6i respectively based on speed commands output from tension control device 9b.

[0046] In addition, the speed control devices 8a to 8i are called ASR (Automatic Speed ​​Regulator).

[0047] The tension control device 9a outputs a speed command for the work rolls of the quenching and tempering mill 1 based on the inlet tension of the steel plate M measured by the inlet tension meter 4a. For example, the tension control device 9a performs feedback control to make the inlet tension of the steel plate M measured by the inlet tension meter 4a the target tension, thereby deriving and outputting a speed command for the work rolls of the quenching and tempering mill 1.

[0048] The tension control device 9b outputs a speed command for the exit-side tension roller 5b based on the exit-side tension of the steel plate M measured by the exit-side tension meter 4b. For example, the tension control device 9b performs feedback control to make the exit-side tension of the steel plate M measured by the exit-side tension meter 4b the target tension, thereby deriving and outputting a speed command for the exit-side tension roller 5b. Furthermore, in Figure 1 For ease of labeling, only the arrow line from the tension control device 9b to the speed control device 8i is shown. However, the tension control device 9b also outputs speed commands for the outward tension roller 5b to the speed control devices 8f-8h. For example, the tension control device 9b outputs the same speed commands to the speed control devices 8f-8i. The same speed commands are commands to rotate the motors 6f-6i at the same speed.

[0049] The tension control devices 9a to 9b are called ATR (Automatic Tension Regulator).

[0050] The rolling control device 10 performs feedback control based on the infeed speed V1 and the exit speed V2 of the steel plate M to achieve the target elongation of the steel plate M, thereby generating and outputting a reduction command. Furthermore, when the weld area WP of the steel plate M is near the tempering mill 1, the rolling control device 10 generates and outputs a reduction command based on the rolling load measured by the force sensor 3. The reduction command includes the command value of the rolling load. Additionally, in... Figure 1 For ease of labeling, only arrow lines from motors 6a and 6i toward the rolling control device 10 are shown. However, information about pulse signals generated by the pulse generators installed on motors 6b to 6d and 6f to 6h is also output to the rolling control device 10.

[0051] The control performed by the rolling control device 10 is called AEC (Auto Elongation Control). AEC itself is a known technology as described in Non-Patent Document 1. However, the specific process used to perform AEC differs from the process described in Non-Patent Document 1.

[0052] Furthermore, as described in Patent Document 1, the quenching and tempering rolling equipment itself is implemented using known technologies. Therefore, the quenching and tempering rolling equipment itself is not limited to... Figure 1 As shown.

[0053] <Overview of Quenching and Tempering Rolling>

[0054] Figure 2 This is a diagram illustrating an example of a heat-rolling process.

[0055] Figure 2 The topmost diagram shows the position of the welded section WP of steel plate M at various times. That is, at... Figure 2 The topmost image shows the movement of a welded part WP over time. Figure 2 The multiple welded areas WP shown in the topmost diagram are the same welded areas. Figure 2 The middle curve is a graph showing the relationship between rolling load and time. Figure 2 The bottommost graph shows the relationship between the elongation of steel plate M and time. The dashed lines marked for time points t1 to t5 represent the rolling load and elongation at the position of the welded part WP in the topmost graph at these time points t1 to t5. These values ​​are the points where the middle and bottommost graphs intersect with the dashed lines.

[0056] In a quenching and tempering rolling mill, to continuously quench and temper roll multiple coils (coiled steel sheets), the tail end of the preceding coil is welded to the front end of the following coil. This welded area is called the welded area WP. The area including the welded area WP is not used as a product. Furthermore, when the quenching and tempering mill 1 performs quenching and tempering rolling on the welded area WP in the same way as other areas of the steel sheet M, there is a risk of damage to the rolling rolls or breakage of the coil at the welded area WP.

[0057] Therefore, as Figure 2 As shown, at a time t1 when the welded section WP reaches the predetermined position on the inlet side of the tempering mill 1, the rolling control device 10 stops the feedback control based on the inlet speed V1 and outlet speed V2 of the steel plate M. Therefore, before the welded section WP reaches the tempering mill 1, the rolling load is reduced to a predetermined value. Consequently, the tempering mill 1 is in a state of light pressure (in... Figure 2In this process, the timing for the rolling load to reach a specified value is set to t2. Furthermore, the lightly compressed state refers to a state where the rolling load of the tempering mill 1 exceeds 0 (zero) and is lower than the rolling load used to control the elongation of the steel plate M. Preferably, the lightly compressed state is a state where the work rolls of the tempering mill 1 contact the weld area WP and the area near the weld area WP while the elongation of the steel plate M remains constant. Alternatively, instead of setting the tempering mill 1 to a lightly compressed state, the rolling process performed by the tempering mill 1 can be interrupted (the so-called mill open state). Interrupting the rolling process performed by the tempering mill 1 means setting the rolling load of the tempering mill 1 to 0 (zero). In this way, the weld area WP passes through the tempering mill 1 with a rolling load lower than the rolling load used to control the elongation of the steel plate M.

[0058] Then, when the welded portion WP reaches the designated position on the exit side of the tempering mill 1, the rolling control device 10 controls the pressing position of the tempering mill 1 to make the rolling load of the steel plate M reach a preset load value. That is, the rolling control device 10 controls the pressing position of the tempering mill 1 using the preset load value as the target rolling load. At this time, for example, the tempering mill 1 performs an operation including pressing the steel plate M with the maximum load and pressing the steel plate M in a certain manner with a rolling load per unit time. In the following description, the preset load value will be referred to as the preset load value as needed. In addition, the initial value of the preset load value is preset before the tempering rolling of the steel plate M is started based on the result of the setting calculation. In the following description, the initial value of the preset load value will be referred to as the initial preset load value as needed. In the setting calculation, the calculation required to make various settings for the tempering rolling equipment to make the elongation of the steel plate M reach the target value is performed. In addition, the setting calculation itself is implemented by the existing tempering rolling equipment. Therefore, a detailed description of the setting calculation is omitted here.

[0059] exist Figure 2 In this process, the time when the welded part WP reaches the specified position on the exit side of the tempering mill 1 is set as t3. After time t4, at time t5, the elongation e of the steel plate M becomes the target value e. ref When the elongation e of steel plate M becomes the target value e ref At this time, the rolling control device 10 restarts the aforementioned feedback control based on the infeed speed V1 and outfeed speed V2 of the steel plate M. Here, the elongation e of the steel plate M can also be used as the target value e. ref The elongation e of the steel plate M relative to the target value e ref The error is within the specified target range.

[0060] Furthermore, the position of the weldment WP is determined, for example, by tracking the steel plate M. For instance, the position of the weldment WP is determined based on the position of the welding apparatus, the entry velocity V1 of the steel plate M, and the exit velocity V2, thereby achieving the tracking of the steel plate M. The tracking of the steel plate M itself is achieved using known techniques. Therefore, a detailed description of the tracking of the steel plate M is omitted here.

[0061] <Insight>

[0062] The inventor's insights will be explained.

[0063] One of the objectives of the rolling control device 10 in this embodiment is to achieve a target value e for the elongation e of the steel plate M from the predetermined position from the welded part WP to the exit side of the tempering mill 1. ref This relates to the technical problem described in Patent Document 1 concerning the control of the pressing position of the quenching and tempering mill 1 during the specified period (time period t3 to t5). Furthermore, this period (time period t3 to t5) can also be the period from the welded position WP to the predetermined position on the exit side of the quenching and tempering mill 1 until the elongation e of the steel plate M is relative to the target value e. ref The period until the error falls within the specified target range. Here, refer to... Figure 3 One of the technical issues described in Patent Document 1 will be explained. Furthermore, the control of the pressing position of the tempering mill 1 during periods other than this period (periods other than timing t3 to t5) can be achieved using known techniques. Therefore, a detailed description of this control is omitted in this embodiment.

[0064] Figure 3 This is a diagram illustrating the technical problem described in Patent Document 1.

[0065] In the technology described in Patent Document 1, the rolling load based on the steel plate M becomes the initial preset load value P. init The previous timer t a The pressing position S a Rolling load P a and elongation e a The rolling load of steel plate M becomes the initial preset load value P. init The timing t b The pressing position S b Rolling load P b and elongation e b And the target value of elongation e. refThe entry-side thickness H1 of steel plate M and the plasticity coefficient Q of steel plate M are derived. Here, the plasticity coefficient Q of steel plate M is the plasticity coefficient of steel plate M at the pressing position S (this is also the case in the following explanation). Furthermore, the entry-side thickness H1 of steel plate M is the thickness of steel plate M at the entry-side position of the quenching and tempering mill 1 (this is also the case in the following explanation). Then, based on the entry-side thickness H1 of steel plate M and the plasticity coefficient Q, the initial preset load value P is derived. init Correction amount P for rolling load adj1 (=ΔP1). Then, derive the initial preset load value P. init With correction amount P adj1 The sum of the values ​​is used as the new preset load value P. set When exporting a new preset load value P set At the same time, the pressing position of the steel plate M is controlled so that the rolling load of the steel plate M becomes the preset load value P. set .

[0066] exist Figure 3 In, by using a timer t a t b Information (press position S) a S b Rolling load P a P b elongation e a e b The new preset load value P is derived from the plasticity coefficient Q. set Therefore, the new preset load value P set Depends on time t a When timer t b The plasticity coefficient Q during the period. The inventors discovered that, as Figure 3 As shown, there exists a plasticity coefficient Q at the initial preset load value P. init The nearby steel plate M experiences a significant reduction in strength. The plasticity coefficient Q of steel plate M is within the initial preset load value P. init The significant decrease in the surrounding area can be attributed to the following: when the initial preset load value P is used... init When the nearby rolling load is subjected to quenching and tempering rolling, the deformation of steel plate M changes from elastic deformation to plastic deformation. Here, in Figure 3 In the bottommost graph, the period representing the elastic deformation region conceptually represents the period during which elastic deformation dominates as the deformation of the steel plate M. The period representing the plastic deformation region conceptually represents the period during which plastic deformation dominates as the deformation of the steel plate M. The closer to the boundary between the periods representing the elastic deformation region and the periods representing the plastic deformation region, the less clear it becomes which deformation, plastic or plastic, is dominant.

[0067] In such a steel plate M, such as Figure 3 The bottom graph shows the curve from time t. a When timer t b The plasticity coefficient Q during the period and the time t b The subsequent plasticity coefficient Q varies considerably. Therefore, based on the time t... a When timer t b The new preset load value P is derived from the plasticity coefficient Q during the period. set It becomes a value that does not correspond to the actual plasticity coefficient Q (refer to...). Figure 3 (The topmost curve). Therefore, when the pressing position of the steel plate M is controlled so that the rolling load of the steel plate M is the preset load value P. set At times, such as Figure 3 As shown in the middle curve, the elongation e of steel plate M significantly exceeds the target value e. ref Therefore, the goal is to make the elongation e of the steel plate M approach the target value e. ref The time until (i.e., until timer t5) becomes longer (see reference). Figure 3 (The middle curve). Therefore, the inventors discovered that when the plasticity coefficient Q of the steel plate M changes significantly, if the preset load value P is updated again... set This shortens the elongation e of the steel plate M, causing it to converge to the target value e. ref Or the time required to approach the target value. The various embodiments of the present invention are based on this understanding.

[0068] In addition, Figure 3 For ease of explanation, an example is given showing only one instance of the preset load value P. set The update status. However, the preset load value P can also be repeatedly applied. set Update. Repeatedly perform preset load value P. set In the case of an update, the initial preset load value P will be adjusted as described above. init The preset load value is updated by replacing it with a new preset load value.

[0069] <Rolling Control Device 10>

[0070] Figure 4 This is a diagram illustrating an example of the functional configuration of the rolling control device 10. Figure 5A , Figure 5B This is a flowchart illustrating an example of a rolling control method performed using the rolling control device 10. Figure 6 This diagram is a conceptual illustration of an example of the processing of the rolling control device 10. Furthermore, as described above, in this embodiment, the elongation e of the steel plate M from the welded portion WP to a predetermined position on the exit side of the tempering mill 1 is set as the target value e. refThe control during the period up to t3 to t5 will be explained. Furthermore, as mentioned above, this period (the period from t3 to t5) can also be from the time the welded part WP reaches the specified position on the exit side of the tempering mill 1 until the elongation e of the steel plate M is relative to the target value e. ref The period until the error falls within the specified target range.

[0071] Reference Figure 5A , Figure 5B as well as Figure 6 right Figure 4 An example of the processing of each functional block of the rolling control device 10 shown will be explained.

[0072] exist Figure 5A In step S501, the initial preset load setting unit 401 determines, based on the tracking results of the steel plate M, whether the welded portion WP of the steel plate M has passed the predetermined position on the exit side of the tempering mill 1. The determination in step S501 is equivalent to whether it has become... Figure 6 The determination of timing t3. As the determination result of step S501, if the welded part WP of steel plate M does not pass the specified position on the exit side of the tempering mill 1, Figure 5A as well as Figure 5B The processing is complete. In this case, start again. Figure 5A The flowchart determines whether the next welding position WP has passed the specified position on the exit side of the tempering mill 1.

[0073] On the other hand, in step S501, when it is determined that the welded portion WP of the steel plate M has passed the predetermined position on the exit side of the tempering mill 1, the processing in step S502 is executed. In step S502, the initial preset load setting unit 401 sets the preset load value P of the steel plate M. set Set to the initial preset load value P init Then, the initial preset load setting unit 401 sets the preset load value P, which includes the steel plate M. set The pressing command is output to the pressing position control device 2. Therefore, in Figure 6 In the middle, the pressing position control device 2 changes the pressing position of the tempering mill 1 so that the rolling load of the steel plate M is close to the initial preset load value P. init .

[0074] Next, in step S503, the actual load determination unit 402 determines the measured value P of the rolling load of the steel plate M. res Is it from the preset load value P? set The value obtained by subtracting the constant α (=P) set -α) and above. The measured value P of the rolling load on steel plate M. res Not from the preset load value P set The value obtained by subtracting the constant α (=P)set In cases where -α) or higher, step S503 is executed again. The actual load determination unit 402 repeatedly acquires the measured value P of the rolling load of the steel plate M according to the control cycle of the rolling control device 10. res The latest measured value P of the rolling load of the steel plate M is used in the determination in step S503. res The determination in step S503 is equivalent to whether, after the welded part WP reaches the specified position on the exit side of the tempering mill 1, it becomes [a certain position] at the current moment. Figure 6 The timing t a The determination. When from time t a When timer t b When the timing period is too short, the calculation accuracy may decrease due to various errors in the sensor. These errors include noise-induced errors, quantization errors, and measurement biases. A constant α is preset to prevent such a decrease in calculation accuracy. For example, the constant α is set such that the timing t... a Rolling load and timing t b The absolute value of the difference in rolling loads becomes more than 50 tons.

[0075] As the determination result of step S503, when the measured value P of the rolling load of the steel plate M is... res Become from the preset load value P set The value obtained by subtracting the constant α (=P) set When -α) or higher, the process in step S504 is executed. In step S504, the first actual setting unit 403 sets the timing t. a The pressing position S a Rolling load P a and elongation e a In this embodiment, the timing t a This is an example of the first timing. As described in Patent Document 1, the elongation e is derived from the following equations (1) and (2).

[0076] e = {(V 2_ref -V1) / V1}-ΔV2 / V1……(1)

[0077] ΔV2=V 2_ref -V2……(2)

[0078] Here, V 2_ref This is the target value of the exit velocity V2 of steel plate M. V is preset based on the properties of steel plate M, etc. 2_ref In this embodiment, the infeed velocity V1 and outfeed velocity V2 of the steel plate M are derived based on the pulse signals generated by the pulse generators installed on the motors 6a-6d and 6f-6i.

[0079] Furthermore, the pressing position S is the pressing position being adjusted by the pressing position control device 2. Therefore, the first actual setting unit 403 obtains this pressing position from the pressing position control device 2. The rolling load P is the measured value of the rolling load being measured by the force sensor 3. Therefore, the first actual setting unit 403 obtains this rolling load from the force sensor 3.

[0080] Next, in step S505, the elongation deviation determination unit 404 determines the measured value P of the rolling load of the steel plate M. res Is it the preset load value P? set The measured value P of the rolling load on steel plate M. res Not the preset load value P set In this case, step S505 is executed again. If these processes are performed consecutively in the order of steps S502, S503, S504, and S505, the preset load value P is... set The initial preset load value P init (Refer to step S502). In this case, the determination in step S505 is equivalent to whether it becomes Figure 6 The timing t b The determination.

[0081] As the determination result of step S505, the measured value P of the rolling load of steel plate M is... res Become the preset load value P set Then, the processing in step S506 is executed. In step S506, the elongation deviation determination unit 404 derives the measured value P of the rolling load of the steel plate M according to equations (1) and (2). res Become the preset load value P set The elongation e of the timed steel plate M b Then, the elongation deviation determination unit 404 derives the measured value P of the rolling load of the steel plate M. res Become the preset load value P set The elongation deviation Δe is the elongation e of the steel plate M at a given time. b With the target value e ref The deviation is then determined. The elongation deviation determination unit 404 then determines whether the absolute value of the elongation deviation Δe is less than or equal to a constant β. The constant β indicates the level of error allowed for the elongation deviation Δe. The constant β is preset based on the properties of the steel plate M, etc.

[0082] For reference Figure 2 As explained, the measured value P of the rolling load on steel plate M... res Become the preset load value P set The elongation e of the timed steel plate M b For the target value e refIn this case, feedback control based on the infeed speed V1 and outfeed speed V2 of the steel plate M is restarted. Therefore, as the determination result of step S506, if the absolute value of the elongation deviation Δe is less than or equal to a constant β, based on... Figure 5A as well as Figure 5B The flowchart processing ends, and the feedback control restarts. Alternatively, the rolling load P of the steel plate M can also be measured. res Become the preset load value P set The elongation e of the timed steel plate M b Relative to the target value e ref If the error is within the target range, feedback control based on the inlet speed V1 and outlet speed V2 of the steel plate M is restarted.

[0083] On the other hand, as a result of step S506, if the absolute value of the elongation deviation Δe is not less than a constant β, then step S507 is executed. If these processes are performed sequentially in the order of steps S502, S503, S504, S505, and S506, the preset load value P... set The initial preset load value P init (Refer to step S502). In Figure 6 The example shown in the middle of the graph illustrates the case where the absolute value of the elongation deviation Δe, |Δe|, is not below a constant β.

[0084] In step S507, the second actual setting unit 405 sets the timing t. b The pressing position S b Rolling load P b and elongation e b Furthermore, the methods for setting the pressing position S, rolling load P, and elongation e are as described in the process of step S504. Additionally, the timing t... b elongation e b Alternatively, it can be the elongation e derived in step S506. b .

[0085] Next, in step S508, the first plasticity coefficient derivation unit 406, based on the timing t set in step S504, a The pressing position S a and rolling load P a and the timing t set in step S507 b The pressing position S b and rolling load P b Derive the plasticity coefficient Q a-b Plasticity coefficient Q a-b Corresponding to time t a When timer t bThe comprehensive value of the plasticity coefficient Q during the period. The comprehensive value is the overall value during the period, typically the average or median value during that period. Furthermore, the side plate thickness acquisition unit 407 is based on the timing t set in step S504. a The pressing position S a Rolling load P a and elongation e a and the timing t set in step S507 b The pressing position S b Rolling load P b and elongation e b Export timer t b The thickness H of the steel plate M on the inlet side 1_b .

[0086] In this embodiment, from time t a When timer t b The period is an example of the first period. Furthermore, in this embodiment, the timing t... a The pressing position S a The value and rolling load P a The value is derived from the plasticity coefficient Q. a-b This is an example of the actual value of the first timing used in the operation. Furthermore, in this embodiment, the timing t... b The pressing position S b The value and rolling load P b The value is derived from the plasticity coefficient Q. a-b This is an example of the actual working value used in the second timing. Furthermore, in this embodiment, the first plasticity coefficient derivation unit 406 is an example of the first plasticity coefficient derivation unit. Here, the actual working value is the actual value obtained by actually performing quenching and tempering rolling on the steel plate M in the quenching and tempering mill 1. The actual working value includes, for example, values ​​representing the properties of the steel plate M (e.g., characteristics of the steel plate M) and values ​​representing the operating result of the quenching and tempering mill 1. Furthermore, the actual working value includes at least one of measured values ​​and calculated values. Additionally, the values ​​representing the operating result of the quenching and tempering mill 1 included in the actual working value are not limited to the value of the pressing position S and the rolling load P. For example, the values ​​representing the operating result of the quenching and tempering mill 1 included in the actual working value may include, in addition to or replacing, at least one of the following (a1) to (a7).

[0087] (a1) Actual value of the rotational speed of the working rolls of the tempering mill 1

[0088] (a2) Actual value of the rotational speed of the inlet tensioning roller 5a

[0089] (a3) Actual value of tension of the steel plate M on the inlet side of the quenching and tempering mill 1, as measured by the inlet tension meter 4a.

[0090] (a4) Actual value of tension of the steel plate M on the exit side of the quenching and tempering mill 1, as measured by the exit side tension meter 4b.

[0091] (a5) Actual value of elongation e of steel plate M

[0092] (a6) Actual value of the thickness of steel plate M at the outlet side (thickness of steel plate M at the outlet side of the tempering mill 1).

[0093] (a7) Actual value of the rotational speed of the output tension roller 5b

[0094] As described in Patent Document 1, the plasticity coefficient Q and the thickness H1 of the inlet plate are derived through the following equations (3) and (4). That is, the plasticity coefficient Q is derived through equation (3). Based on this plasticity coefficient Q and equation (4), the thickness H1 of the inlet plate is derived. 1_b .

[0095] Q = (P) j -P i ) / {1 / M×(P j -P i )+(S j -S i )}……(3)

[0096] H1=(P j -P i ) / Q{1 / (e j +1)-1 / (e i +1)}……(4)

[0097] Here, subscripts i and j indicate the values ​​of timings i and j, respectively, with j representing a timing point after i. In step S508, i is a, and j is b. M is the mill constant.

[0098] In addition, as described in Patent Document 1, the value of the inlet side thickness H1 of the steel plate M can also be the measured value of the plate thickness gauge.

[0099] Next, in step S509, the first correction amount derivation unit 408a (first preset load update unit 408) based on the timing t set in step S507. b elongation e b The timing t exported in step S508 b The thickness H of the inlet side plate 1_b and plasticity coefficient Q a-b And the target value of elongation e. ref Derive the correction amount P for the rolling load. adj1 .

[0100] In this embodiment, the first preset load update unit 408, including the first correction amount derivation unit 408a, is an example of a first preset load update unit. Furthermore, in this embodiment, the first correction amount derivation unit 408a is an example of a first correction amount derivation unit. Additionally, in this embodiment, the elongation e... b Value, side plate thickness H 1_b The value and plasticity coefficient Q a-b The value is the correction amount P derived from the rolling load. adj1 This is an example of the actual values ​​used in the first period. Furthermore, the values ​​representing the properties of the steel plate M included in the actual values ​​are not limited to the values ​​of elongation e, thickness H1, and plasticity coefficient Q. For example, the values ​​representing the properties of the steel plate M included in the actual values ​​may include, in addition to or in place of the values ​​of elongation e, thickness H1, and plasticity coefficient Q, at least one of the following (b1) to (b3).

[0101] (b1) The yield point (YP) value of steel plate M.

[0102] (b2) Value of the inlet width of steel plate M (the width of steel plate M at the inlet position of the quenching and tempering mill 1).

[0103] (b3) Mill constant (rigidity coefficient) of tempering mill 1

[0104] Here, the yield point value of steel plate M can also be a value identified from any one of multiple intervals that define the range of the yield point of steel plate M. A lower limit and an upper limit value for the yield point of steel plate M are set for each of the multiple intervals. In this case, it is determined which of the multiple intervals the yield point value of steel plate M belongs to. The value identified for this determined interval is a value identified from any one of the multiple intervals that define the range of the yield point of steel plate M.

[0105] As described in Patent Document 1, the correction amount P is derived by the following equation (5). adj .

[0106] P adj =Q×H1×{1 / (e ref +1)-1 / (e+1)}……(5)

[0107] Next, in step S510, the first correction amount derivation unit 408a determines the correction amount P derived in step S509. adj1 absolute value | P adj1 Is it below the constant γ? The constant γ is used to suppress the correction factor P. adj1 absolute value | P adj1|It becomes too large, and it is pre-set from this point of view.

[0108] As the determination result of step S510, the correction amount P derived in step S509 adj1 absolute value | P adj1 If | is a constant γ or less, step S511 is omitted and step S512, described later, is executed. On the other hand, as the determination result of step S510, the correction amount P derived in step S509... adj1 absolute value | P adj1 If the value is not less than a constant γ, proceed with the processing in step S511.

[0109] In step S511, the first correction amount derivation unit 408a changes the correction amount P derived in step S509. adj1 So that the correction amount P derived in step S509 is... adj1 absolute value | P adj1 | Becomes a constant γ. At this time, the first correction quantity derivation unit 408a makes the changed correction quantity P adj1 The sign and the correction amount P before the change adj1 The symbols are the same.

[0110] Next, in step S512, the first update value export unit 408b (first preset load update unit 408) exports the preset load value P. set The current value is added to the correction amount P derived in step S509 or S511. adj1 The obtained value is used as the new preset load value P. set Then, the first update value derivation unit 408b will contain the new preset load value P. set The pressing command is output to the pressing position control device 2. Therefore, in Figure 6 In the middle, the pressing position control device 2 changes the pressing position of the tempering mill 1 so that the rolling load of the steel plate M is close to the new preset load value P. set (exist Figure 6 In the example shown, the new preset load value P set For P set1 When these processes are performed sequentially in the order of steps S502, S503, S504, S505, S506, S507, S508, S509, S510, and S512, the new preset load value P is obtained. set Become the initial preset load value P init The correction amount P derived in step S509 adj1 The sum of (P) set =P init +P adj1 As mentioned above, in Figure 6In the example shown, the new preset load value P is thus derived. set For P set1 .

[0111] In addition, the first update value derivation unit 408b will update the preset load value P before the update. set Set to the preset load value P before the update set Set the preset load value P before the update. set The reason is that, in Figure 5B The pre-set load value P before the update must be used in the processing (steps S521 and S530). set If these processes are performed sequentially in the order of steps S502, S503, S504, S505, S506, S507, S508, S509, S510, and S512, the preset load value P before the update will be updated. set The initial preset load value P init .

[0112] In this embodiment, the new preset load value P set (P set1 This is an example of an updated value for a preset load. Furthermore, in this embodiment, the first preset load update unit 408, which includes the first update value derivation unit 408b, is an example of a first preset load update unit. Furthermore, in this embodiment, the first update value derivation unit 408b is an example of a first update value derivation unit.

[0113] When the processing of step S512 is completed, execute Figure 5B The processing in step S521. In step S521, the actual load determination unit 409 determines the measured value P of the rolling load of the steel plate M. res Is it the preset load value P before the update? set 'With constant ε and correction quantity P adj1 The sum of the products (=P) set '+εP adj1 The above refers to the measured value P of the rolling load on steel plate M. res The load value P is not preset before the update. set 'With constant ε and correction quantity P adj1 The sum of the products (=P) set '+εP adj1 In the above cases, the process of step S521 is executed again. The correction amount P is derived in step 509 or S511. adj1 The actual load determination unit 409 repeatedly obtains the measured value P of the rolling load of the steel plate M according to the control cycle of the rolling control device 10. res In the determination of step S521, the latest measured value P of the rolling load of the steel plate M is used. resThe determination in step 521 is equivalent to whether it becomes timer t. c The determination. At time t b Subsequently, the rolling load P of steel plate M was measured. res This becomes the new preset load value P derived in step S512. set1 Previously, exporting timer t c plasticity coefficient Q chk (Refer to Figure 6 (The topmost curve). Therefore, the constant ε is a value greater than 0 and less than 1 (0 < ε < 1). When from time t b When timer t c When the timing period is too short, the calculation accuracy may decrease due to various errors in the sensor. These errors include noise-induced errors, quantization errors, and measurement biases. A constant ε is preset to prevent such a decrease in calculation accuracy. For example, the constant ε is set such that the timing t... b Rolling load P b With timer t c Rolling load P c The absolute value of the difference is over 50 tons.

[0114] In step S521, when the measured value P of the rolling load of the steel plate M is determined... res Become the preset load value P before the update set 'With constant ε and correction quantity P adj1 The sum of the products (=P) set '+εP adj1 When the above occurs, the processing in step S522 is executed. In step S522, the third actual setting unit 410 sets the timing t. c The pressing position S c Rolling load P c and elongation e c Furthermore, the method for setting the pressing position S, rolling load P, and elongation e is as described in the process of step S504.

[0115] Next, in step S523, the second plasticity coefficient derivation unit 411, based on the timing t set in step S507, b The pressing position S b and rolling load P b and the timing t set in step S522 c The pressing position S c and rolling load P c The plasticity coefficient Q is derived through equation (3). chk In equation (3) at this point, i is b and j is c. The plasticity coefficient Q chk Corresponding to time t bWhen timer t c The comprehensive value of the plasticity coefficient Q during the period.

[0116] In this embodiment, the timing t c This is an example of the third timing. Furthermore, from timing t... b When timer t c The period is an example of the second period. Furthermore, in this embodiment, the timing t... b The pressing position S b The value and rolling load P b The value is derived from the plasticity coefficient Q. b-c This is an example of the actual value of the second timing used in the operation. Furthermore, in this embodiment, the timing t... c The pressing position S c The value and rolling load P c The value is derived from the plasticity coefficient Q. b-c This is an example of the actual value of the third timing operation used. Furthermore, in this embodiment, the second plasticity coefficient derivation unit 411 is an example of a second plasticity coefficient derivation unit.

[0117] Next, in step S524, the evaluation index derivation unit 412 derives the plasticity coefficient Q. chk Relative to the plasticity coefficient Q a-b The ratio (=Q) chk / Q a-b ).

[0118] In this embodiment, the evaluation index derivation unit 412 is an example of an evaluation index derivation unit. Furthermore, in this embodiment, the plasticity coefficient Q... chk Relative to the plasticity coefficient Q a-b The ratio (=Q) chk / Q a-b ) is an example of an evaluation indicator.

[0119] Next, in step S525, the evaluation index determination unit 413 determines the plasticity coefficient Q. chk Relative to the plasticity coefficient Q a-b The ratio (=Q) chk / Q a-b Is it lower than the constant ζ? Additionally, the plasticity coefficient Q is derived in step S508. a-b In step S523, the plasticity coefficient Q is derived. chk .

[0120] In this embodiment, the evaluation index determination unit 413 is an example of a determination unit. Furthermore, as described above, in this embodiment, the plasticity coefficient Q... chk Relative to the plasticity coefficient Q a-b The ratio (=Q) chk / Qa-b ) is an example of an evaluation indicator.

[0121] The constant ζ is a value greater than 0 and less than 1 (0 < ζ < 1). Therefore, in step S525, the plasticity coefficient Q is determined. a-b With plasticity coefficient Q chk Is it too large? That is, in step S525, if... Figure 6 As shown in the bottom graph, it is determined at time t. b Does the plasticity coefficient Q decrease significantly afterward? For example... Figure 6 As shown in the bottom curve, when the plasticity coefficient Q is at a time t b When the plasticity decreases significantly in the vicinity, based on the plasticity coefficient Q a-b The correction amount P derived in step S509 adj1 It becomes too large (refer to equation (5)). In this case, the new preset load value P derived in step S512 set The rolling load P of steel plate M needs to be measured. res This becomes the new preset load value P set The previous update was performed again. Therefore, the determination in step S525 is equivalent to whether to update the new preset load value P derived in step S512 again. set (The correction amount P derived in step S509) adj1 The determination of ).

[0122] For example, a constant ζ is predetermined as follows. First, the process is derived to make the elongation e of the steel plate M converge to the target value e. ref Or the time required to approach the target value. For multiple preset load values ​​P set The derivation is performed separately. Furthermore, the derivation is conducted through numerical simulations and experimental simulations. Then, based on the results of this derivation, the following is determined: when the plasticity coefficient Q... a-b With plasticity coefficient Q chk Compared to what extent the elongation e of steel plate M converges to the target value e, the optimal value is determined. ref Or, the time required to approach the target value exceeds the target time. Based on this determined result, a constant ζ is set.

[0123] As the determination result of step S525, the plasticity coefficient Q chk Relative to the plasticity coefficient Q a-b The ratio (=Q) chk / Q a-b If the load is not lower than the constant ζ, the new preset load value P derived in step S512 is not required. set (The correction amount P derived in step S509) adj1 This requires another update. Therefore, it needs to be executed again. Figure 5AThe processing in step S503. In this case, the preset load value P in step S503. set This becomes the new preset load value P derived in step S512. set .

[0124] On the other hand, as a result of step S525, the plasticity coefficient Q... chk Relative to the plasticity coefficient Q a-b The ratio (=Q) chk / Q a-b If the value is lower than the constant ζ, the processing in step S526 is executed. In step S526, the board information export unit 414 performs processing based on the timing t set in step S507. b The pressing position S b and rolling load P b and the timing t set in step S522 c The pressing position S c and rolling load P c Derive the plasticity coefficient Q b-c Plasticity coefficient Q b-c Corresponding to time t b When timer t c The comprehensive value of the plasticity coefficient Q during the period. Plasticity coefficient Q b-c The plasticity coefficient Q derived in step S523 chk The same. Therefore, the plasticity coefficient Q b-c Alternatively, it can be the plasticity coefficient Q derived in step S523. chk Furthermore, the board information export unit 414 is based on timing t. b The pressing position S b Rolling load P b and elongation e b and the timing t set in step S522 c The pressing position S c Rolling load P c and elongation e c Export timer t c The thickness H of the steel plate M on the inlet side 1_c Furthermore, the methods for deriving the plasticity coefficient Q and the thickness H1 of the inlet plate are as described in the processing of step S508. In this case, i in equations (3) and (4) is b and j is c.

[0125] Next, in step S527, the second correction amount derivation unit 415a (the second preset load update unit 415) calculates the time t set in step S522 based on the time t. c elongation e c The plasticity coefficient Q derived in step S526 b-cThe timing t exported in step S526 c The thickness H of the inlet side plate 1_c And the target value of elongation e. ref Derive the correction amount P for the rolling load. adj2 Correction amount P for rolling load adj The method for deriving the value is as described in step S509. As shown in equation (5), the correction amount P adj It is proportional to the plasticity coefficient Q. In step S527, the plasticity coefficient Q derived in step S508 is not used. a-b The plasticity coefficient Q derived in step S523 is used. b-c (Refer to Figure 6 (The bottom curve). Therefore, as Figure 6 As shown in the topmost graph, the correction amount P derived in step S527 adj2 Less than the correction amount P derived in step S509 adj1 .

[0126] In this embodiment, the second preset load update unit 415, including the second correction amount derivation unit 415a, is an example of a second preset load update unit. Furthermore, in this embodiment, the second correction amount derivation unit 415a is an example of a second correction amount derivation unit. Additionally, in this embodiment, the elongation e... c Value, side plate thickness H 1_c The value and plasticity coefficient Q b-c The value is the correction amount P derived from the rolling load. adj2 An example of the actual value of the operation used in the second period.

[0127] Next, in step S528, the second correction amount derivation unit 415a determines the correction amount P derived in step S527. adj2 absolute value | P adj2 | Is it a constant γ or less? The constant γ can be set to be the same as the constant γ used in the process of step S511.

[0128] As the determination result of step S528, the correction amount P derived in step S527 is... adj2 absolute value | P adj2 If | is a constant γ or less, step S529 is omitted and step S530, described later, is executed. On the other hand, as the determination result of step S528, the correction amount P derived in step S527... adj2 absolute value | P adj2 If the value is not less than a constant γ, proceed with the processing in step S529.

[0129] In step S529, the second correction amount derivation unit 415a changes the correction amount P derived in step S527. adj2 So that the correction amount P derived in step S527 is... adj2 absolute value | P adj2 | Becomes a constant γ. At this time, the first correction quantity derivation unit 415a makes the changed correction quantity P adj2 The sign and the correction amount P before the change adj2 The symbols are the same.

[0130] Next, in step S530, the second update value derivation unit 415b (the second preset load update unit 415) exports the preset load value P before the update. set Add the correction amount P derived in step S527 or S529 adj2 The obtained value is used as the new preset load value P. set Then, the second update value derivation section 415b will contain the new preset load value P. set The pressing command is output to the pressing position control device 2. Therefore, in Figure 6 In the middle, the pressing position control device 2 changes the pressing position of the quenching and tempering mill 1 so that the rolling load of the steel plate M becomes the new preset load value P. set (exist Figure 6 In the example shown, the new preset load value P set It is P set2 When these processes are performed sequentially in the order of steps S502, S503, S504, S505, S506, S507, S508, S509, S510, S512, S521, S522, S523, S524, S525, S526, S527, S528, and S530, the new preset load value P is obtained. set Become the initial preset load value P init The correction amount P derived in step S527 adj2 The sum of (P) set =P init +P adj2 As mentioned above, in Figure 6 In the example shown, the new preset load value P is thus derived. set It is P set2 Then, execute again. Figure 5A The processing in step S503. In this case, the preset load value P in step S503. set This becomes the new preset load value P derived in step S530. set .

[0131] In this embodiment, the new preset load value P set (P set2This is an example of a preset load update value. Furthermore, in this embodiment, the second preset load update unit 415, which includes the second update value derivation unit 415b, is an example of a second preset load update unit. Furthermore, in this embodiment, the second update value derivation unit 415b is an example of a second update value derivation unit.

[0132] Summary

[0133] As described above, in this embodiment, the rolling control device 10 is based on the rolling load of the steel plate M becoming a preset load value P. set The timing t b Early timing t a When timer t b The actual values ​​of the operation during the period are used to derive the preset load value P. set Correction amount P adj1 Then, the rolling control device 10 uses the correction amount P adj1 To update the preset load value P set Subsequently, the rolling control device 10, based on timing t... b The measured value P of the rolling load on steel plate M res Become the updated preset load value P set The previous timer t c The actual values ​​of the work during the period were used to derive the plasticity coefficient Q. chk Then, the rolling control device 10 is based on the plasticity coefficient Q. chk Determine whether the updated preset load value P needs to be adjusted. set An update is then performed. As a result of this determination, the updated preset load value P needs to be adjusted. set In the event of a further update, the rolling control device 10 is based on the time t b When timer t c The actual values ​​of the operations during the period are used to derive the preset load value P before the update. set Correction amount P adj2 Then, the rolling control device 10 uses the correction amount P adj2 Update the preset load value P again. set Therefore, the rolling load P of steel plate M can be measured. res The preset load value P was updated based on an excessively large plasticity coefficient Q. set Previously, the plasticity coefficient Q was based on making the plasticity coefficient Q close to the actual plasticity coefficient Q at the current moment. b-c Update the preset load value P again. set Therefore, the elongation e of the steel plate M converges to the target value e. ref Or the target value e ref The time required for nearby areas has been reduced.

[0134] (Second Implementation)

[0135] Next, the second embodiment will be described. In the first embodiment, a rolling control device 10 based on the plasticity coefficient Q was illustrated. chk To determine whether the updated preset load value P needs to be adjusted. set The situation involves updating the load value again. However, the determination of whether the plasticity coefficient Q of the steel plate M has changed significantly can also be based on a physical quantity that is related to the plasticity coefficient Q, rather than on the plasticity coefficient Q itself. Therefore, in this embodiment, the case where the infeed thickness H1 of the steel plate M is used as such a physical quantity will be explained. Thus, the main difference between this embodiment and the first embodiment is that the determination of whether the updated preset load value P needs to be updated is different. set The method for performing another update. Therefore, in the description of this embodiment, the parts that are the same as in the first embodiment are labeled and... Figures 1-6 Symbols that are identical to those marked in the text are omitted with detailed descriptions.

[0136] <Rolling Control Device 10>

[0137] Figure 7 This is a diagram illustrating an example of the functional configuration of the rolling control device 10. Figure 8 This is a flowchart illustrating an example of the processing of the rolling control device 10. Figure 8 This will be described in the first embodiment. Figure 5B The graph undergoing the permutation. After execution... Figure 5A Following the flowchart (processing step S512), execute based on Figure 8 The flowchart processing (the rolling control device 10 in this embodiment also performs based on...) Figure 5A (Processing of the flowchart).

[0138] Reference Figure 8 right Figure 7 An example of the processing of each functional block of the rolling control device 10 shown will be described. The initial preset load setting unit 401, the actual load determination unit 402, the first actual setting unit 403, the elongation deviation determination unit 404, the second actual setting unit 405, the first plasticity coefficient derivation unit 406, the entry-side plate thickness acquisition unit 407, and the first preset load update unit 408 (the first correction amount derivation unit 408a and the first update value derivation unit 408b) are the same as those described in the first embodiment. Therefore, detailed descriptions of these functional blocks will be omitted.

[0139] when Figure 5A When step S512 is completed, execute Figure 8The processing in step S801. In step S801, the actual load determination unit 409 determines the measured value P of the rolling load of the steel plate M. res Is it the preset load value P before the update? set 'With constant ε and correction quantity P adj1 The sum of the products (=P) set '+εP adj1 The above refers to the measured value P of the rolling load on steel plate M. res The load value P is not preset before the update. set 'With constant ε and correction quantity P adj1 The sum of the products (=P) set '+εP adj1 In the above cases, step S801 is executed again. The process of step S801 is similar to... Figure 5B The process of step S521 is the same.

[0140] In step S801, when the measured value P of the rolling load of the steel plate M is determined... res Become the preset load value P before the update set 'With constant ε and correction quantity P adj1 The sum of the products (=P) set '+εP adj1 When the above occurs, the process in step S802 is executed. In step S802, the third actual setting unit 410 sets the timing t. c The pressing position S c Rolling load P c and elongation e c The processing in step S802 and Figure 5B The process of step S522 is the same.

[0141] Next, in step S803, the inlet plate thickness guide section 701 is based on... Figure 5A The timer t set in step S507 b Rolling load P b and elongation e b The timing t set in step S802 c Rolling load P c and elongation e c and in Figure 5A The plasticity coefficient Q derived in step S508 a-b Deriving the thickness H of the steel plate M on the side plate 1_chk .

[0142] In processes other than step S803 (S508, S526, S806), by... i When timer t j The overall plasticity coefficient Q during the period i-jSubstituting into equation (4) to derive the timing t j The thickness H of the inlet side plate 1_j Based on each timing t i t j Rolling load P i P j and the pressing positions Si and S j To export from time t i When timer t j The overall plasticity coefficient Q during the period i-j On the other hand, in step S803, the inlet plate thickness outlet 701 is formed by... Figure 5A The plasticity coefficient Q derived in step S508 a-b , timer t b Rolling load P b and elongation e b and the timing t set in step S802 c Rolling load P c and elongation e c Substituting into equation (4), we can derive the thickness H of the side plate. 1_chk The reason is that, in step S805 below, the plasticity coefficient Q is evaluated in the same way as in step S525. a-b Is it too large?

[0143] In this embodiment, the timing t c This is an example of the third timing. Furthermore, in this embodiment, the rolling load P... b P c Value and elongation e b e c The value is the thickness H of the steel plate M on the input side. 1_chk This is an example of the actual value of the operation during the second period. Furthermore, in this embodiment, the inlet plate thickness export section 701 is an example of an inlet plate thickness export unit.

[0144] Next, in step S804, the evaluation index export unit 702 exports the side plate thickness H. 1_chk The set value H relative to the thickness of the inlet side plate 1_set The ratio (=H) 1_chk / H 1_set ).

[0145] In this embodiment, the evaluation index derivation unit 702 is an example of an evaluation index derivation unit. Furthermore, in this embodiment, the thickness H of the inlet side plate... 1_chk The set value H relative to the thickness of the inlet side plate 1_set The ratio (=H) 1_chk / H 1_set ) is an example of an evaluation indicator.

[0146] Next, in step S805, the evaluation index determination unit 703 determines the thickness H of the input side plate. 1_chk The set value H relative to the thickness of the inlet side plate 1_set The ratio (=H) 1_chk / H 1_set Is it lower than the constant η? Additionally, the thickness H of the inlet plate is predetermined based on the specifications of the steel plate M. 1_set The set value. The side plate thickness H is exported in step S803. 1_chk .

[0147] In this embodiment, the evaluation index determination unit 703 is an example of a determination unit. Furthermore, as described above, in this embodiment, the thickness H of the inlet plate... 1_chk The set value H relative to the thickness of the inlet side plate 1_set The ratio (=H) 1_chk / H 1_set ) is an example of an evaluation indicator.

[0148] The constant η is a value greater than 0 and less than 1 (0 < η < 1). Therefore, in step S805, the plasticity coefficient Q is determined. a-b With time t b When timer t c Is the plastic coefficient Q too large during the period? As shown in equation (4), the thickness H1 of the inlet plate is inversely proportional to the plastic coefficient Q. In addition, the actual thickness H1 of the inlet plate is different from the set value H of the inlet plate thickness. 1_set The difference is not significant. Therefore, if the set value H of the side plate thickness is... 1_set Compared with the plasticity coefficient Q a-b The exported side plate thickness H 1_chk If the value is too large, it is considered that the plasticity coefficient Q is within a certain time t. b The thickness of the surrounding area is significantly reduced. Therefore, in this embodiment, the evaluation index determination unit 703 determines the thickness H of the ingress plate. 1_chk The set value H relative to the thickness of the inlet side plate 1_set Is the ratio lower than the constant η?

[0149] For example, a constant η is predetermined as follows. First, derive the formula that makes the elongation e of the steel plate M converge to the target value e. ref Or the time required to approach the target value. For multiple preset load values ​​P set The derivation is performed separately. Furthermore, the derivation is conducted through numerical simulation and experimental simulations. Then, based on the results of this derivation, it is determined to determine the extent to which the thickness H1 of the inner side plate will cause the elongation e of the steel plate M to converge to the target value e. ref Or, the time required to approach the target value exceeds the target time. Based on this determined result, a constant η is set.

[0150] As the determination result of step S805, the thickness H of the inlet plate is...1_chk The set value H relative to the thickness of the inlet side plate 1_set The ratio (=H) 1_chk / H 1_set If the load value P is not lower than the constant η, the new preset load value P derived in step S512 is... set (The correction amount P derived in step S509) adj1 No further updates are needed. Therefore, execute again. Figure 5A The processing in step S503. In this case, the preset load value P in step S503. set This becomes the new preset load value P derived in step S512. set .

[0151] On the other hand, as the determination result of step S805, the thickness H of the inlet plate is... 1_chk The set value H relative to the thickness of the inlet side plate 1_set The ratio (=H) 1_chk / H 1_set If the value is lower than the constant η, the process in step S806 is executed. In step S806, the board information export unit 704 performs processing based on the timing t set in step S507. b The pressing position S b and rolling load P b and the timing t set in step S802 c The pressing position S c and rolling load P c Derive the plasticity coefficient Q b-c Furthermore, the board information export unit 704 is based on timing t. b The pressing position S b Rolling load P b and elongation e b and the timing t set in step S802 c The pressing position S c Rolling load P c and elongation e c Export timer t c The thickness H of the steel plate M on the inlet side 1_c Furthermore, the methods for deriving the plasticity coefficient Q and the thickness H1 of the inlet plate are as described in the processing of step S508. In this case, i in equations (3) and (4) is b and j is c.

[0152] In this embodiment, the board information export unit 704 is an example of a board information export unit. Furthermore, in this embodiment, the pressed position S... b S c Value, rolling load P b P c Value and elongation e be c The value is the thickness H of the steel plate M on the input side. 1_c An example of the actual value of the operation used in the second period.

[0153] Additionally, in step S806, based on timing t b t c Rolling load P b P c and the pressing position S b S c To export from time t b When timer t c The overall plasticity coefficient Q during the period b-c Based on this plasticity coefficient Q b-c And derive timing t from equation (4). c The thickness H of the steel plate M on the inlet side 1_c Therefore, the thickness H of the inlet plate derived in step S806... 1_c The thickness H of the inlet plate derived in step S803 1_chk different.

[0154] The subsequent steps S807 to S810 are processed and Figure 5B The processing of steps S528 to S530 is the same. That is, in step S807, the second correction quantity deriving unit 415a is based on the timing t set in step S802. c elongation e c The plasticity coefficient Q derived in step S806 b-c The timing t exported in step S806 c The thickness H of the inlet side plate 1_c And the target value of elongation e. ref Derive the correction amount P for the rolling load. adj2 .

[0155] In this embodiment, the second preset load update unit 415, which includes the second correction amount derivation unit 415a, is an example of a second preset load update unit. Furthermore, in this embodiment, the second correction amount derivation unit 415a is an example of a second correction amount derivation unit.

[0156] Next, in step S808, the second correction amount derivation unit 415a determines the correction amount P derived in step S807. adj2 absolute value | P adj2 |Is it a constant below γ?

[0157] As the determination result of step S808, the correction amount P derived in step S807 is... adj2 absolute value | P adj2If | is a constant γ or less, step S809 is omitted and step S810 is executed. On the other hand, as the determination result of step S808, the correction amount P derived in step S807... adj2 absolute value | P adj2 If the value is not less than a constant γ, proceed with the processing in step S809.

[0158] In step S809, the second correction amount derivation unit 415a changes the correction amount P derived in step S807. adj2 So that the correction amount P derived in step S807 is... adj2 The absolute value of γ becomes a constant.

[0159] Next, in step S810, the second update value derivation unit 415b exports the preset load value P before the update. set Add the correction amount P derived in step S807 or S809 adj2 The obtained value is used as the new preset load value P. set Then, execute again. Figure 5A The processing in step S503. In this case, the preset load value P in step S503. set This becomes the new preset load value P derived in step S810. set .

[0160] In this embodiment, the new preset load value P set (P set2 This is an example of a preset load update value. Furthermore, in this embodiment, the second preset load update unit 415, which includes the second update value derivation unit 415b, is an example of a second preset load update unit. Furthermore, in this embodiment, the second update value derivation unit 415b is an example of a second update value derivation unit.

[0161] Summary

[0162] As described above, in this embodiment, the rolling control device 10 is based on timing t b The measured value P of the rolling load on steel plate M res Become the updated preset load value P set The previous timer t c The actual values ​​of the operation during the period are used to derive the thickness H of the steel plate M on the inlet side. 1_chk However, the plasticity coefficient Q is based on the rolling load of the steel plate M becoming a preset load value P. set The timing t b Early timing t a When timer t b The plasticity coefficient Q derived from the actual values ​​of the work done during the period a-bSubsequently, the rolling control device 10, based on the entry-side plate thickness H of the steel plate M,... 1_chk Determine whether the updated preset load value P needs to be adjusted. set An update is performed again. In this embodiment, the preset load value P is updated again to determine whether it needs to be updated again. set The indicator used for judgment is that the thickness H1 of the incoming plate is easily and intuitively grasped by the on-site operators. Therefore, for example, the thickness H1 of the incoming plate of the steel plate M is output (e.g., displayed) by the rolling control device 10. 1_chk This information allows on-site operators to utilize it as a work guide.

[0163] <Variation Example>

[0164] In this embodiment, the thickness H of the steel plate M on the inlet side is illustrated. 1_chk The set value H of the side plate thickness 1_set This is a comparison scenario. However, it is not always necessary. For example, the infeed plate thickness H of the steel plate M derived in step S806 can also be used. 1_c To replace the set value H of the side plate thickness 1_set In this case, the processing of step S806 is performed before step S804.

[0165] Furthermore, the physical quantities that are related to the plasticity coefficient Q are not limited to the thickness H1 of the steel plate M. For example, according to equation (3), the difference between two timed rolling loads and the difference between two timed pressing positions are related to the plasticity coefficient Q. Therefore, the physical quantities that are related to the plasticity coefficient Q can also be the rolling load or the pressing position.

[0166] In addition, in this embodiment, in processes other than step S803, the value of the inlet side thickness H1 of the steel plate M can also be the measured value of the plate thickness gauge.

[0167] (Example)

[0168] Next, the embodiments will be described. In this embodiment, the rolling load and elongation of the steel plate M during quenching and tempering rolling are derived through numerical simulation. Figure 9 This is a diagram illustrating one example of the result. Additionally, in Figure 9 In this context, the units for the rolling load and elongation values ​​are arbitrary.

[0169] exist Figure 9In the figures, graph 911 shows the relationship between rolling load and time when steel plate M is subjected to quenching and tempering rolling using the method of the second embodiment. Graph 912 shows the relationship between rolling load and time when steel plate M is subjected to quenching and tempering rolling using the method described in Patent Document 1. Graph 921 shows the relationship between elongation and time when steel plate M is subjected to quenching and tempering rolling using the method of the second embodiment. Graph 922 shows the relationship between elongation and time when steel plate M is subjected to quenching and tempering rolling using the method described in Patent Document 1.

[0170] like Figure 9 As shown, in the method of the second embodiment, compared with the method described in Patent Document 1, it is possible to shorten the time required to bring the elongation e of the steel plate M to the target value e. ref The time required.

[0171] (Hardware of rolling control device 10)

[0172] An example of the hardware of the rolling control device 10 will be described. Figure 10 In the rolling control device 10, there are a CPU 1001, a main storage device 1002, an auxiliary storage device 1003, a communication circuit 1004, a signal processing circuit 1005, an image processing circuit 1006, an I / F circuit 1007, a user interface 1008, a display 1009, and a bus 1010.

[0173] CPU 1001 oversees the entire rolling control device 10. CPU 1001 uses main storage device 1002 as its working area to execute programs stored in auxiliary storage device 1003. Main storage device 1002 temporarily stores data. Auxiliary storage device 1003 stores various data in addition to the programs executed by CPU 1001.

[0174] The communication circuit 1004 is used for communication with the outside of the rolling control device 10. The communication circuit 1004 can communicate with the outside of the rolling control device 10 wirelessly or via wired means.

[0175] The signal processing circuit 1005 performs various signal processing operations on the signals received from the communication circuit 1004 and the signals input according to the control of the CPU 1001.

[0176] The image processing circuit 1006 performs various image processing operations on the signals input according to the control of the CPU 1001. The processed signals are output to the display 1009, for example.

[0177] User interface 1008 is a part for operators to instruct the rolling control device 10. User interface 1008 includes, for example, buttons, switches, and dials. In addition, user interface 1008 may also have a graphical user interface using display 1009.

[0178] Display 1009 displays an image based on the signal output from image processing circuit 1006. I / F circuit 1007 exchanges data between devices connected to I / F circuit 1007. Figure 10 The user interface 1008 and display 1009 are shown as devices connected to the I / F circuit 1007. However, the devices connected to the I / F circuit 1007 are not limited to this. For example, a portable storage medium may also be connected to the I / F circuit 1007. Furthermore, at least a portion of the user interface 1008 and the display 1009 may be located outside the rolling control device 10.

[0179] Furthermore, the CPU 1001, main storage device 1002, auxiliary storage device 1003, signal processing circuit 1005, image processing circuit 1006, and I / F circuit 1007 are connected to the bus 1010. Communication between these components is performed via the bus 1010. Moreover, the hardware of the rolling control device 10 is not limited to any specific type, as long as it can implement the functions of the rolling control device 10 described above. Figure 10 The hardware shown. For example, the hardware of the rolling control device 10 can also be known hardware used to implement AEC.

[0180] (Other implementation methods)

[0181] Furthermore, the embodiments of the present invention described above can be implemented by executing a program on a computer. In addition, computer-readable recording media containing the above-described program, as well as computer program products containing the above-described program, can also be used as embodiments of the present invention. Examples of recording media include floppy disks, hard disks, optical disks, optical discs, CD-ROMs, magnetic tapes, non-volatile memory cards, and ROMs.

[0182] Furthermore, the embodiments of the present invention described above are merely specific examples of implementing the present invention, and the technical scope of the present invention is not to be interpreted as limited by these descriptions. That is, the present invention can be implemented in various ways without departing from its technical concept or its main features.

[0183] (Relationship with technical solutions)

[0184] The following illustrates an example of the relationship between the technical solution and the implementation method. Furthermore, as mentioned above, the description of the technical solution is not limited to the description of the implementation method.

[0185] <Technical Solution 1>

[0186] The first timing, for example, is achieved through timing t. a To achieve this.

[0187] The second timing, for example, is achieved through timing t. b To achieve this.

[0188] The first preset load update unit is implemented, for example, by using a first preset load update unit 408 (a first correction amount derivation unit 408a and a first update value derivation unit 408b).

[0189] The updated value of the preset load is, for example, through a new preset load value P. set (P set1 To achieve this.

[0190] The third timing, for example, is achieved through timing t. c To achieve this.

[0191] The evaluation index derivation unit can be implemented, for example, by using the evaluation index derivation unit 412 or the evaluation index derivation unit 702.

[0192] Evaluation indicators, for example, are obtained by using the plasticity coefficient Q. chk Relative to the plasticity coefficient Q a-b The ratio (=Q) chk / Q a-b Or the thickness H of the side plate 1_chk The set value H relative to the thickness of the inlet side plate 1_set The ratio (=H) 1_chk / H 1_set To achieve this.

[0193] The determination unit is implemented, for example, by using an evaluation index determination unit 413 or an evaluation index determination unit 703.

[0194] The second preset load update unit is implemented, for example, by using the second preset load update unit 415 (the second correction amount derivation unit 415a and the second update value derivation unit 415b).

[0195] The preset load is updated again, for example, by using a new preset load value P. set (P set2 To achieve this.

[0196] <Technical Solution 2>

[0197] The first correction value derivation unit is implemented, for example, by using the first correction value derivation section 408a.

[0198] The first correction amount is, for example, through the correction amount P. adj1 To achieve this.

[0199] The first update value derivation unit is implemented, for example, by using the first update value derivation section 408b.

[0200] The second correction quantity derivation unit is implemented, for example, by using the second correction quantity derivation section 415a.

[0201] The second correction amount is, for example, through the correction amount P. adj2 To achieve this.

[0202] The second update value derivation unit is implemented, for example, by using the second update value derivation section 415b.

[0203] <Technical Solution 3>

[0204] The first plasticity coefficient derivation unit is implemented, for example, by using the first plasticity coefficient derivation section 406.

[0205] The second plasticity coefficient derivation unit is implemented, for example, by using the second plasticity coefficient derivation section 411.

[0206] The plasticity coefficient of the metal plate derived from the first plasticity coefficient derivation unit is, for example, obtained by using the plasticity coefficient Q. a-b To achieve this.

[0207] The plasticity coefficient of the metal plate derived from the second plasticity coefficient derivation unit described above is, for example, obtained by using the plasticity coefficient Q. chk To achieve this.

[0208] <Technical Solutions 4 and 5>

[0209] Physical quantities that are related to the plasticity coefficient of a metal sheet can be obtained, for example, by using the entry thickness H1 of the steel sheet, the rolling load P, or the pressing position S.

[0210] <Technical Solution 6>

[0211] The first plasticity coefficient derivation unit is implemented, for example, by using the first plasticity coefficient derivation section 406.

[0212] The side plate thickness export unit is implemented, for example, by using the side plate thickness export section 701.

[0213] The plasticity coefficient of the metal plate derived from the first plasticity coefficient derivation unit is, for example, obtained by using the plasticity coefficient Q. a-b To achieve this.

[0214] The inlet plate thickness of the metal plate derived by the aforementioned inlet plate thickness derivation unit is, for example, the inlet plate thickness H of the steel plate M. 1_chk To achieve this.

[0215] Based on the specifications of the aforementioned metal sheet, the set value of the inlet thickness of the aforementioned metal sheet, for example, the set value H of the inlet thickness of steel sheet M.1_set To achieve this.

[0216] The thickness of the metal plate at the third timing point mentioned above, for example, is determined by timing t. c The thickness H of the steel plate M on the inlet side 1_c To achieve this.

[0217] <Technical Solution 7>

[0218] The board information export unit is implemented, for example, by using the board information export section 414.

[0219] Industrial availability

[0220] This invention can be used, for example, for temper rolling of metal sheets.

Claims

1. A rolling control device, which, in order to ensure that the elongation of a metal sheet at the welded portion reaches a target value or within a target range after passing through a tempering mill in a state of interrupted rolling or under light pressure, derives a preset load value and outputs a pressing command based on the preset load value, characterized in that, have: The first preset load update unit derives the updated value of the preset load based on the actual value of the operation during the first period from the first timing to the second timing. The evaluation index derivation unit derives an evaluation index that is the difference between the plasticity coefficient of the metal plate in the first period and the plasticity coefficient of the metal plate in the second period from the second time to the third time. The determination unit determines, based on the evaluation index derived by the evaluation index derivation unit, whether it is necessary to update the preset load value derived by the first preset load update unit again. as well as The second preset load update unit, when the determination unit determines that the updated value of the preset load derived by the first preset load update unit needs to be updated again, derives the updated value of the preset load again based on the actual operation value in the second period. The aforementioned preset load is a rolling load preset as the target rolling load of the aforementioned quenching and tempering rolling mill. The aforementioned first timing is a timing that precedes the timing at which the measured value of the rolling load of the aforementioned quenching and tempering mill becomes the aforementioned preset load. The second timing mentioned above refers to the timing at which the measured value of the rolling load of the aforementioned quenching and tempering mill becomes the aforementioned preset load. The third timing mentioned above is the timing before the measured value of the rolling load of the quenching and tempering mill becomes the updated value of the preset load derived from the first preset load update unit. The above-mentioned rolling control device also has: The first plasticity coefficient derivation unit derives the plasticity coefficient of the metal plate based on the actual working value of the first timing and the actual working value of the second timing. as well as The second plasticity coefficient derivation unit derives the plasticity coefficient of the metal plate based on the actual working values ​​obtained during the second and third timing cycles. The above evaluation index is determined based on the plasticity coefficient of the metal plate derived by the first plasticity coefficient derivation unit and the plasticity coefficient of the metal plate derived by the second plasticity coefficient derivation unit.

2. The rolling control device according to claim 1, characterized in that, The aforementioned first preset load update unit also has: The first correction quantity derivation unit derives a first correction quantity for the preset load before it is updated by the first preset load update unit, based on the actual operation value in the first period. as well as The first update value derivation unit derives the updated value of the preset load based on the preset load before the update and the first correction value derived by the first correction value derivation unit. The aforementioned second preset load update unit also has: The second correction quantity derivation unit, based on the actual operation value during the second period, derives a second correction quantity for the preset load before it was updated by the first preset load update unit; and The second update value exporting unit exports a new update value for the preset load based on the preset load before the update and the second correction value exported by the second correction value exporting unit.

3. The rolling control device according to claim 1 or 2, characterized in that, The above evaluation indicators are determined based on physical quantities that are related to the plasticity coefficient of the metal plate.

4. The rolling control device according to claim 3, characterized in that, The physical quantity that is related to the plasticity coefficient of the aforementioned metal plate includes the thickness of the inlet side of the aforementioned metal plate.

5. The rolling control device according to claim 4, characterized in that, It also has: The first plasticity coefficient derivation unit derives the plasticity coefficient of the metal plate based on the actual working value of the first timing and the actual working value of the second timing. as well as The inlet plate thickness derivation unit derives the inlet plate thickness of the metal plate based on the plasticity coefficient of the metal plate derived by the first plasticity coefficient derivation unit and the actual value of the operation during the second period. The evaluation index derivation unit derives the evaluation index based on the inlet plate thickness of the metal plate derived by the inlet plate thickness derivation unit, and the set value of the inlet plate thickness of the metal plate based on the specifications of the metal plate or the inlet plate thickness of the metal plate at the third timing.

6. The rolling control device according to claim 5, characterized in that, It also has: The plate information export unit exports the entry-side plate thickness of the metal plate at the third time point based on the plasticity coefficient of the metal plate during the second period and the actual operation value during the second period.

7. A rolling control method, in order to ensure that the elongation of a metal sheet at the welded portion reaches a target value or within a target range after passing through a tempering mill in a state of interrupted rolling or under light pressure, derives a preset load value and outputs a pressing command based on the preset load value, characterized in that... have: The first preset load update process derives the updated value of the preset load based on the actual operation value during the first period from the first timing to the second timing. The evaluation index derivation process derives an evaluation index that is the difference between the plasticity coefficient of the metal plate in the first period and the plasticity coefficient of the metal plate in the second period from the second time to the third time. The determination process, based on the evaluation index derived from the evaluation index derivation process, determines whether it is necessary to update the update value of the preset load derived from the first preset load update process again. as well as In the second preset load update step, when the determination step determines that the preset load update value derived from the first preset load update step needs to be updated again, a new update value for the preset load is derived based on the actual operation value during the second period. The aforementioned preset load is a rolling load preset as the target rolling load of the aforementioned quenching and tempering rolling mill. The aforementioned first timing is a timing that precedes the timing at which the measured value of the rolling load of the aforementioned quenching and tempering mill becomes the aforementioned preset load. The second timing mentioned above refers to the timing at which the measured value of the rolling load of the aforementioned quenching and tempering mill becomes the aforementioned preset load. The third timing mentioned above is the timing before the measured value of the rolling load of the quenching and tempering mill becomes the updated value of the preset load derived from the first preset load update process. The above rolling control method also has the following characteristics: The first plasticity coefficient derivation process derives the plasticity coefficient of the metal plate based on the actual working values ​​of the first timing and the second timing. as well as The second plasticity coefficient derivation process derives the plasticity coefficient of the metal plate based on the actual values ​​obtained during the second and third timing operations mentioned above. The above evaluation index is determined based on the plasticity coefficient of the metal plate derived from the first plasticity coefficient derivation process and the plasticity coefficient of the metal plate derived from the second plasticity coefficient derivation process.

8. A recording medium storing a program for causing a computer to perform the following processing: in order to ensure that the elongation of a metal sheet at a welded portion, after passing through a tempering mill in an interrupted rolling state or under light pressure, reaches a target value or within a target range, deriving a preset load value and outputting a pressing command based on the preset load value, characterized in that... To make the computer perform: The first preset load update process derives the updated value of the preset load based on the actual operation value during the first period from the first timing to the second timing. The evaluation index derivation process derives an evaluation index that is the difference between the plasticity coefficient of the metal plate in the first period and the plasticity coefficient of the metal plate in the second period from the second time to the third time. The determination process, based on the evaluation index derived from the evaluation index derivation process, determines whether it is necessary to update the update value of the preset load derived from the first preset load update process again. as well as In the second preset load update step, when the determination step determines that the preset load update value derived from the first preset load update step needs to be updated again, a new update value for the preset load is derived based on the actual operation value during the second period. The aforementioned preset load is a rolling load preset as the target rolling load of the aforementioned quenching and tempering rolling mill. The aforementioned first timing is a timing that precedes the timing at which the measured value of the rolling load of the aforementioned quenching and tempering mill becomes the aforementioned preset load. The second timing mentioned above refers to the timing at which the measured value of the rolling load of the aforementioned quenching and tempering mill becomes the aforementioned preset load. The third timing mentioned above is the timing before the measured value of the rolling load of the quenching and tempering mill becomes the updated value of the preset load derived from the first preset load update process. The above procedure causes the computer to perform the following further actions: The first plasticity coefficient derivation process derives the plasticity coefficient of the metal plate based on the actual working values ​​of the first timing and the second timing. as well as The second plasticity coefficient derivation process derives the plasticity coefficient of the metal plate based on the actual values ​​obtained during the second and third timing operations mentioned above. The above evaluation index is determined based on the plasticity coefficient of the metal plate derived from the first plasticity coefficient derivation process and the plasticity coefficient of the metal plate derived from the second plasticity coefficient derivation process.

Images