JP2011161470A - Method of controlling plate thickness and rolling apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize the plate thickness of a strip by suppressing the tension variation which is generated on the strip accompanying the rotation of a reel when rolling the strip while winding it with the reel. <P>SOLUTION: A rolling apparatus 1 includes: a rolling stand 10 for rolling the strip 15; a left reel 11 for winding the strip 15 while giving tension to the strip 15 and a left deflector roll 13 which is arranged between the rolling rolls of the rolling stand 10 and the left reel 11 and with which the route of the strip 15 is changed. In the rolling apparatus 1, the left deflector roll 13 is moved to a position where the tension variation of the strip 15 is reduced. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sheet thickness control method for controlling the sheet thickness of a material to be rolled in a rolling apparatus and a rolling apparatus for executing the sheet thickness control method.

  In cold rolling, a strip (rolled material) such as a hot-dip steel strip is rolled by a rolling mill while being wound around a reel. At the time of winding, the strip can be fixed by inserting the end of the strip into a groove-like grip formed on the outer peripheral curved surface of the reel along the rotation axis direction. However, when the strip is fixed using the grip, the strip is bent suddenly in the vicinity of the grip, so that the strip slightly floats from the surface of the reel to cause bulging. Further, when the strip is wound around the bulge portion, the bulge is transferred over several layers.

  Patent Document 1 discloses a method of suppressing the generation of a step near the end of the strip and the transfer of the step by aligning the end of the strip with the step of the stepped sleeve fitted on the reel surface. Furthermore, Patent Document 1 discloses a method of controlling the rotation speed of a reel to improve the alignment accuracy of the stepped portion of the stepped sleeve and the tip of the strip, and suppress the generation of the step near the strip tip and the transfer of the step. Is disclosed.

JP 2002-263733 A

  However, even if the method of Patent Document 1 is used, it is not possible to completely eliminate the step in the vicinity of the strip tip. In the first place, the bulge of the strip tip that occurs when the strip is fixed using a grip is used. It cannot be lost. Further, since Patent Document 1 only performs alignment of the leading end of the strip, once the bulge is generated in the strip, the bulge transfer cannot be suppressed in the middle.

  According to the study by the present inventors, when a bulge occurs in the strip, a periodic pulse-like tension fluctuation is periodically applied to the strip as the reel rotates. Thickness variation occurs. In order to satisfy stringent accuracy requirements, it is necessary to keep the tension applied to the strip constant during rolling to suppress fluctuations in the thickness of the strip, so strip bulge can be avoided as in the case of fixing the strip tip using a grip. In other situations, a new means of keeping the tension on the strip constant is needed.

  The present invention relates to a plate thickness control method and a plate thickness control method capable of stabilizing the plate thickness of the strip by suppressing a variation in tension generated in the strip when the strip is wound on the reel. It aims at providing the rolling device which performs.

  A first sheet thickness control method of the present invention includes a rolling roll that rolls a material to be rolled, a reel that winds the material to be rolled, and a path of the material to be rolled that is disposed between the rolling roll and the reel. A sheet thickness control method for controlling a sheet thickness of a material to be rolled in a rolling apparatus having a deflector roll to be changed, wherein the deflector roll is moved to a position where the amount of tension fluctuation of the material to be rolled decreases.

  A first rolling device of the present invention is disposed between a rolling roll that rolls a material to be rolled, a reel that winds up the material to be rolled, and a roll and the reel, and changes the path of the material to be rolled. A deflector roll, a moving means for moving the deflector roll, and a plate thickness control means for controlling the moving means so as to move the deflector roll to a position where the amount of fluctuation in tension of the material to be rolled decreases.

  According to the first sheet thickness control method and the first rolling apparatus, it is possible to suppress the tension variation and the sheet thickness variation that occur in the material to be rolled as the reel rotates. In particular, it is possible to suppress fluctuations in tension and plate thickness that cannot be eliminated depending on the configuration of the reel, such as when swelling occurs at the tip of the material to be rolled fixed to the grip of the reel.

  Furthermore, according to the first sheet thickness control method and the first rolling device, the tension fluctuation accompanying the rotation of the reel is improved in response as compared with the case of controlling the reel drive motor having a large inertial force and a slow response. Can be suppressed. According to the first sheet thickness control method and the first rolling apparatus, it is possible to suppress the fluctuation in tension due to the rotation of the reel with high responsiveness as compared with the case where the sheet thickness is controlled by the control of the rolling apparatus having a slow response. Can do. Since the tension fluctuation accompanying the rotation of the reel can be suppressed with high responsiveness, the tension fluctuation that rapidly changes periodically with the rotation of the reel can be effectively suppressed.

  In addition, it is preferable that the rolling apparatus and 1st rolling apparatus which perform a 1st sheet | seat thickness control method are cold rolling apparatuses by which high quality is calculated | required by the to-be-rolled material after a process. The rolling device may be a reverse type or a non-reverse type. The rolling device may control the plate thickness in a reciprocating manner, or may execute only one way. The reel may be dedicated for winding or may be used for both winding and paying out.

  The deflector roll moves in a direction to weaken the force pressing the rolled material when the tension of the rolled material increases, and moves in a direction to increase the force pressing the rolled material when the tension of the rolled material decreases. Is preferred. The moving direction of the deflector roll may be the vertical direction, the horizontal direction, or another direction as long as the tension of the material to be rolled can be increased or decreased. As a method of moving the deflector roll, a method of servo-controlling a hydraulic cylinder is exemplified.

  The second plate thickness control method of the present invention is based on the plate thickness of the material to be rolled when the reel rotation amount is the first rotation amount in the first plate thickness control method. The position of the deflector roll in the second rotation amount after n cycles (n is an integer of 1 or more) is controlled.

  The second rolling apparatus of the present invention further comprises a rotation amount detecting means for detecting the amount of rotation of the reel and a plate thickness measuring means for measuring the plate thickness in the first rolling apparatus. Further, the sheet thickness control means is based on the sheet thickness of the material to be rolled when the rotation amount is the first rotation amount, and after n cycles from the first rotation amount (n is an integer of 1 or more). The position of the deflector roll at the second rotation amount is controlled.

  According to the second plate thickness control method and the second rolling device, it is possible to stably suppress tension fluctuations periodically generated as the reel rotates. In particular, by controlling the tension fluctuation by the movement of the deflector roll, it is possible to suppress the tension fluctuation that occurs periodically and rapidly with high responsiveness. As a cause of the periodic fluctuation of the tension, a bulge formed and transferred to the strip in the vicinity of the grip portion of the reel that locks the tip of the material to be rolled is exemplified. It should be noted that the plate thickness used for controlling the position of the deflector roll may be the size of the plate thickness itself or a variation amount of the plate thickness. When measuring the sheet thickness after rolling, it is preferable to correct the measurement timing and the actual rolling timing. The control of the deflector roll is preferably started before the second rotation amount is reached. As the second rotation amount, one rotation amount after the first rotation amount may be selected, or a plurality of rotation amounts may be selected.

  The third plate thickness control method of the present invention is a method of controlling the position of the deflector roll based on the amount of rolled material to be rolled on the reel in the second plate thickness control method.

  In the third rolling apparatus of the present invention, the plate thickness control means of the second rolling apparatus is configured to control the position of the deflector roll based on the amount of rolled material to be rolled on the reel.

  According to the third plate thickness control method and the third rolling device, it is possible to suppress fluctuations in tension that are constantly generated in the material to be rolled as the reel rotates. Examples of the tension fluctuations that occur constantly include tension fluctuations due to an increase in the thickness of the material to be rolled wound around the reel.

  The fourth plate thickness control method of the present invention is the same as the third plate thickness control method in that the radius at the second rotation amount is based on the correspondence between the rotation amount and the radius change amount of the reel as the winding amount increases. A change amount is calculated, a radius variation amount of the reel at the second rotation amount is calculated based on a plate thickness at the first rotation amount, and a radius change amount at the second rotation amount and a radius variation at the second rotation amount are calculated. A total amount of change in the radius of the reel in the second amount of rotation is calculated by adding the amount, and a control amount indicating the position of the deflector roll in the second amount of rotation is calculated based on the total amount of change in radius. The deflector roll is moved based on the control amount.

  According to a fourth rolling apparatus of the present invention, the third rolling apparatus further includes storage means for storing a correspondence relationship between the amount of rotation and the amount of change in the radius of the reel accompanying an increase in the amount of winding. Further, the plate thickness control means calculates the reel radius fluctuation amount at the second rotation amount based on the plate thickness at the first rotation amount, and the second thickness obtained by referring to the storage means. Radius change calculation for calculating the total radius change amount of the reel in the second rotation amount by adding the radius change amount in the rotation amount and the radius fluctuation amount in the second rotation amount calculated by the plate thickness reflecting means. And a control amount calculating means for calculating a control amount indicating the position of the deflector roll at the second rotation amount based on the total radius variation. Further, the moving means moves the deflector roll based on the control amount.

  According to the fourth sheet thickness control method and the fourth rolling apparatus, both the tension fluctuation amount detected by the fluctuation of the sheet thickness and the tension fluctuation amount caused by the increase in the number of windings of the material to be rolled on the reel The calculation of the control amount can be simplified by replacing the calculation with the amount of change in the radius of the calculation. As a reference source of the correspondence relationship between the rotation amount and the radius change amount, a table storing the correspondence relationship in advance, a calculation formula for calculating the correspondence relationship, and a measuring instrument for measuring the radius of the reel are exemplified. Examples of the calculation method of the radius variation amount include a calculation formula for calculating the correspondence and a table storing the correspondence in advance. The control amount may indicate the position of the deflector roll directly by a numerical value, may indicate the amount of movement of the deflector roll, or may indirectly indicate the position of the deflector roll. Good.

  ADVANTAGE OF THE INVENTION According to this invention, when winding a to-be-rolled material on a reel, the plate | board thickness of a to-be-rolled material can be stabilized by suppressing the tension | tensile_strength fluctuation | variation which arises in a to-be-rolled material with rotation of a reel.

FIG. 1 is a diagram showing a schematic configuration and a part of functional blocks of the rolling apparatus of the present embodiment.

  FIG. 1 is a schematic configuration diagram of a rolling device 1 of the present embodiment. The rolling device 1 includes a rolling stand 10, a left reel 11, a right reel 12, a left deflector roll 13, and a right deflector roll 14 as main components. In the present specification, the left-right direction only indicates a relative positional relationship.

  In this embodiment, a sheet thickness control method when the rolling apparatus 1 is a cold reverse rolling apparatus will be described. However, the rolling apparatus that executes the sheet thickness control method of the present invention is limited to the rolling apparatus 1 of the present embodiment. Is not something For example, the rolling device 1 may be a rolling device that performs rolling only in one direction.

  Although the rolling stand 10 of this embodiment rolls while rolling down the work roll which contacts the strip 15 directly with a backup roll and an intermediate roll, the rolling stand 10 may be a rolling apparatus having another structure. The rolling stand 10 may be a single stand or may be rolled in a dandem manner.

  The left reel 11 is disposed on the left side of the rolling stand 10, and the right reel 12 is disposed on the right side of the rolling stand 10. Each of the left reel 11 and the right reel 12 functions as a payoff reel for paying out the strip 15 and also functions as a tension reel for winding the strip 15. When one of the left reel 11 and the right reel 12 functions as a payoff reel, the other functions as a tension reel.

  Between the left reel 11 and the rolling stand 10, a left deflector roll 13 for changing the path of the strip 15 is disposed. Between the right reel 12 and the rolling stand 10, a right deflector roll 14 for changing the path of the strip 15 is disposed.

  When the left reel 11 and the right reel 12 rotate clockwise, the strip 15 is sent from the right reel 12 near the lower left of the right reel 12 in the upper left direction, and the path is changed along the horizontal plane by the right deflector roll 14. It is sent to the rolling stand 10. The strip 15 rolled by the rolling stand 10 is routed in the lower left direction by the left deflector roll 13, contacts the strip 15 on the left reel 11 at the winding start position 16 near the lower right of the left reel 11, and the left reel 11 is wound up. When the left reel 11 and the right reel 12 rotate counterclockwise, the strip 15 is rolled while moving from the left reel 11 to the right reel 12 through a path reverse to that in the clockwise direction. By reciprocating the strip 15 a plurality of times between the left reel 11 and the right reel 12, the strip 15 is rolled to a desired thickness. Although the strip 15 of this embodiment is finally rolled from about 0.8 mm to about 0.3 mm, the thickness of the strip 15 is not limited to these.

  The tip of the strip 15 is fixed by the grip portion 17 of the left reel 11. The grip portion 17 holds the tip of the strip 15 inserted inside from the slit on the surface of the left reel 11. Since the strip 15 bends when it comes out of the grip portion 17, a bulge 18 that slightly floats from the surface of the left reel 11 is generated. When the winding progresses and the strip 15 is wound up so as to overlap the bulge 18 at the tip of the strip 15, the bulge 18 of the inner strip 15 is transferred to the outer strip 15. The tension applied to the strip 15 during rolling depends on the winding radius of the entire left reel 11 including the strip 15, and particularly greatly depends on the winding radius at the winding start position 16.

  The left reel 11 is not limited to the one having the grip portion 17 for inserting the front end of the strip 15 inside. In the present embodiment, even when the bulge 18 generated by the grip portion 17 causes the plate thickness variation, the plate thickness variation caused in this way can be suppressed, but the occurrence of the bulge 18 should be suppressed from the beginning. Thus, the plate thickness fluctuation can be further suppressed. For example, the left reel 11 may be one that winds the strip 15 while pressing the tip of the strip 15 flatly against the surface of the left reel 11, mounts a stepped sleeve on the surface, and forms a step at the tip of the strip 15. It may be suppressed.

  In a state where the left deflector roll 13 is fixed, when the left reel 11 rotates clockwise, the winding radius is substantially constant or smooth as long as the bulge 18 does not reach the winding start position 16. Increase. When the bulge 18 reaches the winding start position 16, the winding radius rapidly increases, so that the tension applied to the strip 15 increases rapidly. When the tension applied to the strip 15 is increased, the thickness of the strip 15 being rolled by the rolling stand 10 is rapidly reduced. Accordingly, as the left reel 11 rotates, the bulges 18 periodically reach the winding start position 16 and the tension applied to the strip 15 shows a sharp abrupt increase periodically. At the same time, the thickness of the strip 15 being rolled is increased. Periodically thins rapidly.

  In order to execute a plate thickness control method that suppresses tension fluctuations associated with the rotation of the left reel 11, the rolling device 1 further includes a hydraulic cylinder 20, a servo valve 21, a plate thickness gauge 22, an angle detector 23, and a host computer 24. The input unit 25 and the plate thickness control unit 26 are provided. Hereinafter, a delta indicating the difference is denoted by Δ.

  The hydraulic cylinder 20 moves the left deflector roll 13 up and down. When the movement amount Δd is input, the servo valve 21 controls the oil amount of the hydraulic cylinder 20 and moves the left deflector roll 13 in the vertical direction by the movement amount Δd. The position of the left deflector roll 13 is fed back from the hydraulic cylinder 20 to the servo valve 21. When the negative movement amount Δd is inputted, the servo valve 21 relaxes the tension of the strip 15 by moving the left deflector roll 13 downward. When the positive movement amount Δd is input, the servo valve 21 moves the left deflector roll 13 upward to increase the tension of the strip 15.

  The thickness gauge 22 measures the thickness deviation Δh of the strip 15 near the left exit of the rolling stand 10. The plate thickness deviation Δh represents a deviation from the plate thickness of the rolling target in the rolling stand 10. When there is no influence of the bulge 18, the plate thickness deviation Δh is 0, and when there is an influence of the bulge 18, the plate thickness is thin, so the plate thickness deviation Δh is a negative value. An example of the plate thickness gauge 22 is an X-ray thickness gauge.

  The angle detector 23 is a pulse generator (PLG) attached to the drive motor of the left reel 11, and outputs a predetermined number T of pulses while the left reel 11 makes one rotation.

  The host computer 24 controls the entire rolling device 1 and includes a predicted value storage unit 27. The predicted value storage unit 27 indicates a function f1 that represents the correspondence between the number of pulses indicating the rotation angle from the initial position of the left reel 11 and the steady change amount of the winding radius of the left reel 11. The amount of change in the winding radius is represented by the thickness in the radial direction from the state where the winding amount is zero. As the number of pulses increases, the amount of change in the winding radius increases stepwise or continuously by gradually winding the strip 15. The function f1 of the present embodiment is stored in the form of a table, but may be stored in the form of a mathematical expression. The function f1 is prepared for each rolling condition specified by a plurality of parameters of the strip 15. Examples of the parameters include the type of material to be rolled, the target plate thickness, the plate width, the number of rolling operations, and the moving direction of the strip 15. The function f1 may be predicted by simulation or may be predicted based on past results. The input unit 25 is an interface for an operator to change the function f1, and is configured by a general-purpose PC, for example.

  As shown in FIG. 1, the plate thickness control unit 26 is based on the pulse input from the angle detector 23, the plate thickness deviation Δh input from the plate thickness meter 22, and the function f <b> 1 read from the predicted value storage unit 27. The control amount Δd is output to the servo valve 21. The plate thickness control unit 26 relaxes the tension variation accompanying the increase in the winding radius of the left reel 11 based on the function f1, and also relaxes the tension variation periodically generated by the bulge 18 based on the plate thickness deviation Δh. . If a plate thickness deviation Δh occurs when the number of pulses indicating the rotation angle of the left reel 11 is p, the left deflector roll 13 is moved when the number of pulses reaches p + T when the left reel 11 further rotates once.

  Actually, the plate thickness variation measured by the plate thickness meter 22 when the number of pulses is p is generated in the rolling stand 10 before the number of pulses p. Furthermore, if the control amount Δd is output when the number of pulses is p + T, the control of the hydraulic cylinder 20 by the servo valve 21 is delayed. Accordingly, the plate thickness control unit 26 allows for the left deflector roll after one rotation of the left reel 11 from the occurrence of the plate thickness deviation in anticipation of the occurrence of the plate thickness deviation and the measurement timing shift and the delay in the control of the hydraulic cylinder 20. Control 13 is moved to the target position.

  Hereinafter, a specific configuration and operation of the plate thickness control unit 26 of the present embodiment will be described. The plate thickness control unit 26 includes a predicted value reading unit 30, a predicted value correction unit 31, a shift buffer 32, a plate thickness reflection unit 33, a radius change amount calculation unit 34, and a control amount calculation unit 35. The plate thickness control unit 26 of the present embodiment is realized by a programmable logic controller (PLC), but is not limited to the PLC as long as the same function is realized. Each component of the plate thickness control unit 26 according to the present embodiment describes the function of the plate thickness control unit 26 as a functional block, and the components need not be separated if a similar function can be realized.

  The predicted value reading unit 30 reads the function f1 that matches the rolling conditions from the predicted value storage unit 27 of the host computer 24. The rolling condition may be requested from the predicted value reading unit 30 to the higher order computer 24 or may be transmitted to the predicted value reading unit 30 according to the control of the higher order computer 24. The predicted value correcting unit 31 corrects the function f1 read by the predicted value reading unit 30 according to the information input by the worker through the input unit 25, and creates a corrected function f2. By providing the predicted value correcting unit 31, it is possible to create a more accurate function f2 reflecting the experience of the worker and the rolling environment.

  The shift buffer 32 reads the plate thickness deviation Δh m times at regular intervals in accordance with the pulse output from the angle detector 23 while the left reel 11 makes one rotation (m is a positive integer). For example, when the angle detector 23 outputs 320 pulses per rotation, the shift buffer 32 reads the plate thickness deviation Δh for each pulse if m = 320, and the plate thickness every 10 pulses if m = 32. Read the deviation Δh. The m plate thickness deviations Δh are held while being shifted in a ring shape. The newly read plate thickness deviation Δh (θ) updates the plate thickness deviation Δh (θ−T) before one rotation. However, if the newly read thickness deviation Δh is 0, Δh (θ−T) is maintained. For example, the thickness deviation Δh detected in the first round is maintained after the second round. The plate thickness deviation Δh (θ) is output from the shift buffer 32 when the kth plate thickness deviation Δh (θ + k) is read. After the sheet thickness deviation Δh (θ) is actually generated at the rolling stand 10, the left deflector roll 13 is synchronized with the timing at which the left reel 11 rotates once and the sheet thickness deviation Δh (θ + T) is predicted to occur next. K is set so that moves to the target position.

  When the plate thickness deviation Δh (θ) is input from the shift buffer 32, the plate thickness reflecting unit 33 calculates the amount of variation f3 (θ + T) of the winding radius from the pulse number θ to the pulse number (θ + T) after one rotation. calculate. A control gain corresponding to the function f3 is set in advance based on simulations and actual measurement values. When the plate thickness is reduced due to the influence of the bulge 18, the plate thickness deviation Δh becomes a negative value. The larger the absolute value of the plate thickness deviation Δh, the larger the fluctuation amount of the winding radius.

  The radius change amount calculation unit 34 reads, from the predicted value correction unit 31, a radius change amount f2 (θ + T) that accompanies an increase in the winding amount that is predicted to occur in the number of pulses (θ + T). Further, the radius change amount calculation unit 34 inputs the radius variation amount f3 (θ + T) due to the bulge 18 that is predicted to occur at the number of pulses (θ + T) from the plate thickness reflection unit 33. Further, the radius change amount calculation unit 34 adds the winding radius change amount f2 (θ + T) and the radius variation amount f3 (θ + T) to detect the plate thickness deviation Δh (θ) after one rotation. A total winding radius change amount f4 (θ + T) of the left reel 11 is calculated.

  The control amount calculator 35 calculates the control amount Δd (θ + T) so that the tension applied to the strip 15 is constant based on the total winding radius change amount f4 (θ + T). The control gain of the control amount calculation unit 35 is set based on simulations and actual measurement values. The control amount calculation unit 35 outputs the calculated control amount Δd (θ + T) to the servo valve 21.

  The servo valve 21 controls the hydraulic cylinder 20 according to the input control amount Δd (θ + T) and moves the left deflector roll 13. By the movement of the left deflector roll 13, both fluctuations in tension due to an increase in the winding amount of the strip 15 and fluctuations in tension applied to the strip 15 when the bulge 18 reaches the winding start position 16 are suppressed. The The timing at which the control amount Δd is output to the servo valve 21 may be further adjusted by components other than the shift buffer 32.

  As described above, since the rolling device 1 can keep the tension of the strip 15 constant by the movement of the left deflector roll 13, it controls the rotational speed and rotational torque of the left reel 11, and rotates the rotational axis of the left reel 11. As compared with the case of moving the roll or controlling the rolling force in the rolling stand 10, it is possible to suppress fluctuations in the plate thickness with high responsiveness. When the plate thickness variation Δh (θ) occurs in the strip 15 rolled at the timing of the pulse number θ, the rolling device 1 performs rolling at the timing of the pulse number (θ + T) based on the plate thickness variation Δh (θ). By keeping the tension applied to the strip 15 constant, the occurrence of the plate thickness variation Δh (θ + T) can be suppressed. That is, periodic fluctuations in plate thickness can be suppressed with good responsiveness. According to the rolling device 1, it is possible to suppress fluctuations in tension that are constantly generated in the strip 15 as the left reel 11 rotates.

  The plate thickness variation is not limited to that generated by the bulge 18. Factors that periodically generate fluctuations in tension, such as the bulge 18, do not have to be constantly generated over the entire length of the strip 15, and may be reduced as the winding of the strip 15 progresses. The factor that periodically generates the tension fluctuation may be generated in the middle of winding of the strip 15 or may be eliminated in the middle of winding. According to the rolling device 1, even if the generation cycle of the factor that periodically generates the tension fluctuation deviates from T, the tension fluctuation can be suppressed after one cycle when the deviation occurs.

  The rolling device 1 of the present embodiment controls the plate thickness by moving the left deflector roll 13 when winding the strip 15 with the left reel 11, but when winding the strip 15 with the right reel 12. The plate thickness may be controlled by moving the right deflector roll 14 to the right, or the plate thickness may be controlled on both the left and right sides. The rolling device 1 of the present embodiment moves the left deflector roll 13 in the vertical direction, but may move the left deflector roll 13 in other directions such as the horizontal direction. The left deflector roll 13 may be moved by equipment other than the hydraulic cylinder 20.

  INDUSTRIAL APPLICABILITY The present invention can be applied to sheet thickness control of various rolling apparatuses that roll while winding a strip with a reel, and the sheet thickness varies depending on the tension variation applied to the strip by the reel.

DESCRIPTION OF SYMBOLS 1 Rolling apparatus 10 Rolling stand 11 Left reel 12 Right reel 13 Left deflector roll 14 Right deflector roll 15 Strip 16 Winding start position 17 Grip part 18 Swelling 20 Hydraulic cylinder 21 Servo valve 22 Thickness gauge 23 Angle detector 24 Host computer 25 Input unit 26 Thickness control unit 27 Predicted value storage unit 30 Predicted value read unit 31 Predicted value correction unit 32 Shift buffer 33 Thickness reflection unit 34 Radius change amount calculation unit 35 Control amount calculation unit

Claims (8)

A rolling roll for rolling the material to be rolled, a reel for winding the material to be rolled, and a deflector roll disposed between the rolling roll and the reel to change the path of the material to be rolled. In a rolling apparatus, a sheet thickness control method for controlling the sheet thickness of the material to be rolled,
Moving the deflector roll to a position where the amount of fluctuation in tension of the material to be rolled decreases.
Plate thickness control method. Based on the plate thickness of the material to be rolled that is rolled when the amount of rotation of the reel is the first amount of rotation, the nth after n cycles (n is an integer of 1 or more) from the first amount of rotation Controlling the position of the deflector roll at a rotation amount of 2;
The thickness control method of Claim 1. Controlling the position of the deflector roll based on the amount of winding of the material to be rolled in the reel;
The plate thickness control method according to claim 2. Calculating the amount of radius change in the second amount of rotation based on the correspondence between the amount of rotation and the amount of change in radius of the reel accompanying the increase in the amount of winding;
Calculating a radius variation amount of the reel in the second rotation amount based on the plate thickness in the first rotation amount;
Calculating a total radius change amount of the reel in the second rotation amount by adding the radius change amount in the second rotation amount and the radius variation amount in the second rotation amount;
Calculating a control amount indicating a position of the deflector roll in the second rotation amount based on the total radius change amount;
The plate thickness control method according to claim 3, wherein the deflector roll is moved based on the control amount. A rolling roll for rolling the material to be rolled;
A reel for winding the material to be rolled;
A deflector roll disposed between the rolling roll and the reel to change the path of the material to be rolled;
Moving means for moving the deflector roll;
A sheet thickness control means for controlling the moving means so as to move the deflector roll to a position where the amount of fluctuation in tension of the material to be rolled decreases. A rotation amount detecting means for detecting a rotation amount of the reel;
A plate thickness measuring means for measuring the plate thickness, and
The sheet thickness control means is based on the sheet thickness of the material to be rolled that is rolled when the rotation amount is the first rotation amount, and after n cycles (n is 1 or more) from the first rotation amount. Controlling the position of the deflector roll at a second rotation amount).
The rolling device according to claim 5. The plate thickness control means controls the position of the deflector roll based on a winding amount of the material to be rolled on the reel.
The rolling device according to claim 6. Storage means for storing a correspondence relationship between the amount of rotation and the amount of change in radius of the reel accompanying an increase in the amount of winding;
The plate thickness control means is
A plate thickness reflecting means for calculating a radius variation amount of the reel in the second rotation amount based on the plate thickness in the first rotation amount;
By adding the radius change amount in the second rotation amount obtained by referring to the storage means and the radius variation amount in the second rotation amount calculated by the plate thickness reflecting means, the second change amount is obtained. A radius change amount calculating means for calculating a total radius change amount of the reel at a rotation amount of
Control amount calculation means for calculating a control amount indicating a position of the deflector roll in the second rotation amount based on the total radius change amount;
The moving means moves the deflector roll based on the control amount.
The rolling device according to claim 7.