JP4419567B2 - Cross roll rolling machine work roll cross angle adjusting method and rolling method using the same - Google Patents

Description

  The present invention relates to a method for adjusting a cross angle of a work roll of a cross roll rolling mill that rolls a sheet or strip-shaped rolled metal material (hereinafter, the rolled material) by crossing the upper and lower work rolls, and a cross using the same The present invention relates to a rolling method using a roll mill.

  Responding to the recent demands for tighter tolerances on the thickness of metal plates such as steel, cross-roll type rolling in which the upper and lower work rolls are rolled in order to control the thickness (plate crown) in the plate width direction. Machines (hereinafter referred to as cross roll mills) have been put into practical use.

  This cross roll mill is characterized in that the material to be rolled is rolled in a state where the rolls are crossed. FIG. 5 shows an arrangement relationship between the upper and lower work rolls 8 (when distinguishing between upper and lower, o is attached on the top and u on the bottom) and the material to be rolled 50. 5 (a) is a plan view and FIG. 5 (b) is a side view, but the upper and lower work rolls 8 are rolled with the central portion in the width direction of the material 50 to be rolled as a cross center C (virtual point called a cross point). They are arranged so as to cross at a cross angle θ (variable) set for each condition.

  As a result, as shown in FIG. 5B, there is a difference in the opening of the upper and lower work rolls 8 near the cross point C (b) and the roll end (b). The distribution in the width direction of 50 is curved as shown in FIG. If the cross angle θ is increased, the slope of this curve becomes steep, and if the cross angle θ is set to 0, the slope of the curve becomes gentle. In the figure, 6 (6o, 6u) is a backup roll.

  Conventionally, the rolling mill before the appearance of the cross-roll rolling mill has a thickness distribution at the central portion in the width direction due to the deflection of the roll due to the rolling load as shown in FIG. However, in the cross roll rolling mill, the above-mentioned cross angle θ is optimally set and the opening degree of the upper and lower work rolls 8 is made into an optimal curved shape as shown in FIG. 6 (b). By doing so, it is possible to compensate for the amount of deflection of the roll, to bring the width direction plate thickness distribution of the material 50 to be rolled closer to a uniform one, and to flatten the plate thickness distribution in the width direction of the material 50 to be rolled. . For this reason, in recent years, many have been installed regardless of hot rolling or cold rolling.

  The difference in structure of the cross roll rolling mill whose main part is shown in the perspective view shown in FIG. 7 from the previous rolling mill is that the backup roll chock 10 and the work roll chock 12 are conveyed in the conveying direction of the material to be rolled 50 as shown in FIG. The crosshead 20 is arranged so as to be held in the opposite direction (when the operator side and the drive side, which will be described later, are distinguished, the operator side is denoted by o and the drive side is denoted by d). The cross angle θ of the upper and lower backup rolls 6 and 8 is adjusted by driving in the conveying direction of the material 50.

  The method of driving the upper work roll 8o and the upper backup roll 6o, the lower work roll 8u and the lower backup roll 6u as a pair between the upper work and the lower work as shown in FIG. 7 is called a pair cross method, and a method of crossing only the work rolls. Is called the work roll single cross method.

  Further, the cross head 20 is arranged on either the side where the motor for driving the work roll 8 is arranged (referred to as the drive side) or the side where the operator operation panel on the opposite side is arranged (referred to as the operator side). The side on which the cross head 20 is arranged is rotated around the cross point C so that the upper and lower work rolls 8 cross by moving the upper and lower cross heads 20 in the conveying direction of the material to be rolled 50 or in the opposite direction. One cross system with the opposite side where the crosshead 20 is not disposed as a pivot (one with a crosshead on the drive side of the upper roll, the crosshead on the operator side of the lower roll), operator side and drive side The cross head 20 is arranged on both of them, and both of them are crossed by turning around the cross point C, and no pivot is provided. That the cross method. Hereinafter, although the case of the pair cross method and the single cross method will be described, since the basic function is the same for both the work roll single cross method and the both cross methods, the cross roll rolling mill referred to in the present invention includes these. I mean.

  FIG. 8A shows a schematic view seen from the operator side of a pair cross type cross roll rolling mill. There is a crosshead 20 on the operator side of the lower roll. The cross head 20 is rotated by rotating a screw 22 disposed on a side surface of the cross head 20 and moving it forward and backward by screwing with a nut 24. FIG. 8B shows a plan cross-sectional view of the AA view in FIG. 8A, that is, a state in which the work roll chock 12 is restrained as viewed from above. As shown in this figure, a crosshead liner 4 having a semi-cylindrical shape is arranged between the crosshead 20 and the backup roll chock 10 and between the work roll chock 12 and the crosshead 20 (FIG. Only the relationship with the cross head 20 is shown). When the cross head 20 is moved, the cross head 20 and the cross head liner 4 slide each other on the semi-cylindrical sliding surfaces, thereby smoothly changing the cross angle θ. It has a structure that can be done.

  In the figure, 2 is a rolling mill housing, 13 is a chock liner, 16 is a backup roll pivot block, and 18 is a work roll pivot block.

  By the way, in general, during rolling of the material to be rolled 50 by a rolling mill, as also in Patent Document 1, by shifting the work roll 8 in the conveying direction of the material to be rolled 50 both up and down (this is called offset), A horizontal component force (also referred to as offset component force) is generated in a direction indicated by a black arrow B in FIG. A horizontal component force D is generated in the backup roll 6 in the direction opposite to the conveying direction of the material to be rolled 50. Then, the work roll chock 12 is pushed in the conveying direction of the material to be rolled 50 and the backup roll chock 10 is pushed in the opposite direction, and each roll chock is directed to the rolling mill housing 2 on the exit side and the entry side in the conveying direction of the material to be rolled 50, respectively. Pressed and stabilized.

  However, since there is a clearance d between each roll chock and the rolling mill housing 2 as shown in FIG. 8, the rolling load is small, that is, due to an offset unless the roll chock is positioned in the conveying direction of the material 50 to be rolled. During rolling with a small pressing force, when the cross angle is changed, the work roll chock 12 or the backup roll chock 10 is displaced in the conveying direction of the material 50 or in the opposite direction in the rolling mill housing 2. If it is uneven on the left and right (the drive side and the opposite operator side), a difference in opening between the upper and lower work rolls 8 occurs on the left and right in the width direction of the material 50. In the case of fifty meanders, bends, and severe cases, there was a problem of breaking.

  In order to prevent this, for example, as in Patent Document 2 and Patent Document 3, a device that presses a bearing box (chock) with a hydraulic cylinder in the conveying direction of the material to be rolled or a work roll chock is crossed as in Patent Document 4 A crosshead having a pressing means for pressing in a direction, a method of predicting a rolling mill housing shrinkage due to a rolling load and minimizing a gap between a chock and a rolling mill housing, as in Patent Document 5, etc. has been proposed. Yes.

  Here, as shown in FIG. 9, the shrinkage of the housing is a deformation in the conveying direction of the material to be rolled that occurs in the central portion in the vertical direction of the housing due to the rolling load acting in the vertical direction of the rolling mill housing 2 during rolling, that is, Refers to the contraction of the distance between the entrance side and the exit side of the housing. In order to cause this housing contraction, a clearance d is provided between each roll chock and the rolling mill housing 2. When the rolling load is applied, the housing shrinks, so if the roll chock is pinched by both the housing 2 on the entry side and the exit side in the transport direction, the bearing in the roll chock rotates in an elliptical shape. It will burn out. In this sense, 1 to 5 mm inside / outside is provided as a clearance d between each roll chock and the rolling mill housing 2. When a rolling load is applied, it is desirable that the clearance d is 1 mm or less and the roll chocks are close to 0 mm as long as the roll chock is not clamped by the housing 2 due to contraction of the housing.

JP-A-8-197110 JP-A-9-285806 JP 2001-113308 A JP-A-5-38504 Japanese Patent Laid-Open No. 7-3018 Japanese Patent Laid-Open No. 58-2224015

  However, although the work roll chock is pressed in the conveyance direction (coincidence with the offset direction) or the cross direction as in Patent Documents 2 to 4, the hydraulic cylinder required for the pressing is small enough to be pushed into a narrow space. The actual situation is that sufficient results are not obtained due to reasons such as feasibility and difficulty in securing the installation space for the hydraulic oil piping supplied to it.

  Moreover, the problem is not only during the rolling of the material to be rolled. In particular, in the case of hot rolling, a series of operations in which the work roll 8 bites into each rolled material, rolls for a while, and the tail ends are intermittently repeated. If the setting of the cross angle when the work roll 8 bites the tip of the roll is poor (the cross point is shifted from the center of the width of the material to be rolled), the moment the tip of the material to be rolled bites into the work roll 8 The material to be rolled suddenly meanders to one side of its width, and in the worst case, it collides with a side guide (not shown) and clogs up, and there is a problem that rolling cannot be continued any more and stopped.

  Then, as in Patent Document 5, even if a method of predicting the shrinkage amount of the rolling mill housing due to the rolling load and minimizing the distance between the chock and the rolling mill housing is taken, the tip of the material to be rolled becomes the work roll 8. The problem when the setting of the cross angle at the time of biting is poor remains unsolved.

  The reason why the setting of the cross angle becomes poor when the work roll bites the tip of the material to be rolled is because the amount of crossing the upper and lower work rolls 8 (cross angle θ) in the first place. Is set up (set) toward the set value for each condition such as predicted rolling load (roll deflection deformation), command plate thickness, command plate crown, etc. of the material to be rolled 50. When the cross angle θ is to be operated in the same direction as the direction in which the cross angle θ is set when set, the cross head 20 that rotates the work roll chock 12 and the screw 22 that drives the cross head 20 are rolled. Although there is no problem because it is on the same side in the conveyance direction of the material 8, the operation of the current cross angle θ is performed in the direction opposite to the direction in which the operation of the cross angle θ was performed immediately before the cross angle θ was set. When vomiting is that the screw 22 for driving a cross head 20 for rotating the work roll chocks 12, it is of opposite side as viewed in the conveying direction of the rolled material 8.

  That is, the work roll chock 12 is viewed in the conveyance direction with the cross head 20 on the side where the work roll chock 12 is rotated when it is set up (set) immediately before the center between the entry and exit side cross heads 20 of the material 50 to be rolled. Thus, the work roll 8 will bite the tip of the material to be rolled 50 in a state of being close to the position in contact with the cross head 20 on the opposite side.

  This will be described with an example with reference to the drawings. When the direction in which the operation of the cross angle θ (movement of the work roll chock 12) is performed when the cross angle θ is set immediately before is the direction indicated by the arrow E in FIG. Is the same as the direction of the arrow E, but there is no problem as shown by the arrow F in FIG. Then, when the operation of the cross angle θ is performed this time, the work roll chock 12 and thus the work roll 8 will approach the entrance side cross head 20 by the clearance d. In the figure, 20oi is an upper entry side crosshead, and 20ui is a lower entry side crosshead.

  Then, when the cross angle θ is set immediately before, the direction in which the operation of the cross angle θ (the movement of the work roll chock 12) is performed is the direction indicated by the arrow E in FIG. When the direction in which the angle θ is moved toward the set value (the work roll chock 12 is moved) is the same as the direction of the arrow E shown in FIG. 10A when the cross angle θ is set immediately before, The operation of the cross angle θ this time is the same as that shown in FIG. 10A when the cross angle θ is set immediately before, and the operation shown in FIG. 10B is representatively shown for the upper drive side. Although the side crosshead inlet side end position and the work roll chock outlet side end position coincide with each other (is in contact with the outlet crosshead), there is no problem, but the direction in which the operation of the cross angle θ is performed this time is shown in FIG. When it is reversed as shown by arrow F When the cross angle θ is set this time, the work roll chock 12 and thus the cross head 20 to which the work roll 8 comes close are affected by the existence of the clearance d described above, and the opposite entry side as viewed in the conveying direction of the material 8 to be rolled. It will be a thing. For this reason, as shown in FIG. 11 (b), the upper drive side exit crosshead entry end position and the work roll chock exit end position do not match, and the actual cross angle θ differs from the control target, that is, the set value θa. Therefore, the plate crown of the material to be rolled 50 does not become the target command value, and the control accuracy is not sufficient. The same applies to the relationship between the lower operator side crosshead entry side end position and the work roll chock exit end position.

  In the case of both crosses, as in Patent Document 4, the work roll chock 12 is pressed in the cross direction (if the operator side is the exit side in the transport direction, the drive side is the opposite side on the operator side and the drive side, such as the transport direction entry side). However, as shown in FIGS. 12 and 13, the situation is almost the same as in the case of the single cross shown in FIGS. 10 and 11. In the figure, 12od is the upper drive side work roll chock, 12uo is the lower operator side work roll chock, 12ud is the lower drive side work roll chock, 12oo is the upper operator side work roll chock, 20odi is the upper drive entry side crosshead, 20uoi is the lower operator side entry Side crosshead.

  As a method that seems to be helpful for solving this problem, there is a technique of shifting and adjusting the crosshead 20 and the work roll chock 12 as disclosed in Patent Document 6.

  However, the technique of Patent Document 6 has a problem that sufficient setting accuracy may not be obtained if there is an influence of mechanical system wear or backlash. The cause of mechanical wear and backlash is not limited to one. For example, due to aged wear between the screw 22 and the work roll chock 12, backlash increases when the operation direction of the cross angle θ is reversed immediately before and this time. In addition, there are many things other than those mentioned here, such as an increase in the clearance d due to wear of the work roll chock liner 13 over time, and a change in contact state due to corrosion of the work roll chock 12 and work roll chock liner 13 over time.

  In the present invention, when the cross angle of the work roll of the cross roll mill is adjusted and the cross angle is adjusted to the set value as the control target, the operation of the cross angle θ is performed immediately before the cross angle θ is adjusted. Even when the operation of the cross angle θ is to be performed in the direction opposite to the current direction, the actual cross angle θ matches the control target of the cross angle θ, that is, the set value θa, and the plate crown of the material 50 to be rolled is the target. It is an object of the present invention to enable accurate control so as to match the command value.

  The present invention has been made to solve the problems of the prior art as described above. That is, according to the present invention, when the cross angle of the cross roll rolling mill work roll is adjusted and the cross angle is adjusted to the set value as the control target, the cross angle operation is performed immediately before the cross angle is adjusted. When the cross angle operation is to be performed in the direction opposite to the direction of the current cross angle, the cross angle operation is continued even after the cross angle has reached the control target setting value. When the cross angle exceeds the set value as the control target for the amount corresponding to the clearance between the cross head and the work roll chock on the side where the operation is performed, the cross angle operation is temporarily stopped, and then The cross angle is adjusted such that the cross angle is moved in a direction opposite to the direction in which the cross angle is to be operated this time, and the cross angle is adjusted so as to reach the control target set value. Le is a cross angle adjusting method of a rolling mill work roll.

  The present invention also provides a rolling method using a cross roll mill, wherein the rolling is performed by adjusting the cross angle by the above method.

  According to the present invention, when the cross angle of the cross roll rolling mill work roll is adjusted and the cross angle is adjusted to the set value as the control target, the cross angle θ is adjusted when the cross angle θ is adjusted immediately before. Even when the operation of the current cross angle θ is to be performed in the direction opposite to the direction performed, the actual cross angle θ is made to coincide with the control target, that is, the set value θa, and the plate crown of the material 50 to be rolled is targeted. It is now possible to control with precision so that it matches the command value.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, when the cross angle θ of the cross roll mill work roll is operated to adjust the cross angle to the set value as the control target, the operation of the cross angle θ is adjusted immediately before the cross angle is adjusted. If the cross angle θ is to be operated this time in the direction F opposite to the direction in which the crossing is performed, the operation of the cross angle θ is continued even after the cross angle reaches the set value as the control target, as indicated by the arrow G. The cross angle θ exceeds the set value as the control target by an amount corresponding to the clearance d between the cross head 20 and the work roll chock 12 on the side where the cross roll θ is operated at this time. The cross angle θ is temporarily stopped, and then the cross angle θ is operated in a direction opposite to the direction in which the cross angle θ is to be performed this time so as to reach the control target set value. cross So as to adjust the θ.

  In this way, in the example of FIG. 1, the actual center position of the work roll 8 is on the exit side in the conveyance direction of the material to be rolled 50 by a clearance d or more with respect to the center position of the work roll 8 to be controlled. After moving, the workpiece 50 moves to the entry side in the conveying direction, and the clearance d between the work roll chock 12 and the exit crosshead 20 disappears on both the drive side and the operator side (although it appears on the entry side instead) No), since the adjustment of the cross angle is completed in a state where the work roll chock 12 and the exit cross head 20 are in contact with each other, as a result, the work roll 8 stops at the center position of the work roll 8 as a control target with high accuracy. In addition, since the work roll chock 12 and the exit crosshead are in contact with each other with a certain amount of force and stopped, the influence of the change in the contact state due to wear and corrosion over time is as follows. Almost no need. This is because the adjustment of the cross angle is completed with the work roll chock 12 in contact with the same side of the cross head 20 as when the cross angle was adjusted immediately before. Then, the actual cross angle θr can be accurately controlled so that the actual cross angle θr matches the control target, that is, the set value θa, and the sheet crown of the material 50 to be rolled matches the target command value, and the product quality and the yield can be controlled. Will improve.

In order to determine when the cross angle θ (rad) exceeds the set value as the control target by an amount corresponding to the clearance d, the rotation stop on the pivot side of the work roll 8 and the rotation center on the crossing side are determined. When the interval L is
L / 2 × sin (θ / 2) ≧ d (1)
However, since the crossing angle θ is usually designed as a mechanical equipment specification within 1.5 (deg) at maximum and expressed in deg, it is very small. Is expressed in rad,
Lθ / 4 ≧ d (2)
It is good.

  When the cross angle θ exceeds the set value as the control target by an amount corresponding to the clearance d formed between the cross head 20 and the work roll chock 12, the operation of the cross angle θ is temporarily stopped or the cross angle θ In order to stop the control at the set value as the control target as described above, a function called APC (Automatic Positioning Control) may be used. This is the same as the value obtained by multiplying the absolute value of the deviation from the target by the 1/2 power of the absolute value of the deviation from the target and the sign of the deviation from the target (target-actual value) while capturing the actual value of the rotation angle of the screw 22. Although it can be easily realized by controlling to give the target value of the rotational speed (or angular speed) of the driving actuator of the screw 22, it is of course possible to make appropriate changes such as providing a dead band near zero deviation.

  In the above example, the case of a single cross has been described. However, as shown in FIG. In FIG. 2, the upper operator side work roll chock 12oo and the lower drive side work roll chock 12ud on the left side in the figure are moved in the same direction E as before, and at the same time, the lower operator side work roll chock 12uo and the upper drive side work roll chock 12od on the right side in the figure are moved. In the case of the picture on the left in the figure that was moving in the direction F opposite to the previous time, the present invention is applied, and after the set value that is the control target exceeds the clearance, the work roll chock is shown on the right in the figure. The case where the operation is reversed is shown. At that time, not both of the pair of crossheads 20 on the diagonal line are reversed, that is, operated in the opposite direction, but only one side is reversed. In the case of FIG. 2 in which the cross angle is increased, only the output side is reversed. Here, when the cross angle (not shown) is reduced, only the entry side is reversed. This is because it is necessary to push the work roll chock on the exit side in the transport direction on both the operator side and the drive side.

  In addition, although the above description has all been performed about the work roll, in the case of a pair cross type rolling mill, the work roll and the backup roll are pushed by the cross head 20 and operate in pairs with each other on the upper side and the lower side. Therefore, the same applies to the backup roll at the same time. In this sense, the present invention can be applied regardless of the work roll cross type rolling mill and the pair cross type rolling mill.

  Further, the cross roll rolling mill of the present invention may be either hot rolling or cold rolling. In hot rolling (both thick plate and strip), a series of operations are repeated intermittently for each material to be rolled, the work roll 8 biting the tip, rolling for a while, and the tail end coming out. However, in cold rolling, each material to be rolled is connected by welding its tip and tail. Also in the case of hot rolling, in recent years, there has been a case where continuous hot rolling is performed in which each tip and tail end of each material to be rolled are joined and connected. Even if these are considered comprehensively, the adjustment of the cross angle θ is performed in the case where the initial set adjustment is performed on the tip of each material to be rolled in the case of hot rolling for each material to be rolled, and the continuous heat. There are two types of adjustments in the longitudinal direction of the material to be rolled in the case of cold rolling and cold rolling, and in either case, the cross angle is adjusted immediately before in the present invention. This corresponds to the case where the current cross angle operation is to be performed in the direction opposite to the direction in which the cross angle operation was performed. Therefore, the present invention can be applied to either case.

  The present invention was applied to F7, which is a final rolling mill in a finish rolling mill (in the figure, although it is a stand of F1 to F7, but is not limited to this) 38 in the hot rolling line 100 as shown in FIG. In the figure, command data such as a command plate thickness and a command plate crown is stored and stored in the business computer 90 for each material 50 to be rolled, and at a timing before a finish rolling of a single material 50 to be rolled. When the command data is transmitted to the process computer 70, setting calculation not described in detail in the process computer 70 is activated, the predicted rolling load and the like are calculated, and each finishing rolling is performed together with the upper and lower work roll gaps of each finishing mill. A set value, which is a control target of the cross angle θ of the machine work roll, is calculated and transmitted to the control device 60 to actually set (initial set) the cross angle of each finishing mill work roll. Thereafter, the leading end of the one material to be rolled 50 is caught in the finish rolling mill 38, and such a series of operations is repeated at every timing immediately before each material to be rolled 50 is bitten.

  In the figure, 30 is a heating furnace (three units No. 1 to 3 in the figure, but is not limited to this), 32 is a rough rolling mill (three stands R1 to R3 in the figure, but is not limited thereto). ), 34 is a crop shear, 36 is a descaling device, 40 is a cooling zone, and 42 is a coiler (in the figure, DC1 and DC2 are two, but not limited to this).

  FIG. 4A shows how much the actual sheet crown measured on the exit side of the finishing mill 18 after application of the present invention is applied to the target command value before application of the present invention. It is a figure which shows the control accuracy. FIG. 4 (b) after execution is smaller in FIG. 4 (b) after the implementation than the command value of the target plate crown, and the variation of the actual plate crown is small. It can be seen that the thickness accuracy is improved. Of course, at the moment when the tip of the material to be rolled 50 bites into the work roll 8, the material to be rolled 50 suddenly meanders to one side of the width, and closes against a side guide (not shown) and clogs in a bowl shape. There was no such thing as stopping without being able to continue.

  INDUSTRIAL APPLICABILITY The present invention can improve the control accuracy of a plate crown with respect to the adjustment of the cross angle of a work roll of a cross roll rolling machine that rolls a material to be rolled such as a plate or a strip-shaped steel by crossing the upper and lower work rolls. . In addition, in the case of hot rolling, at the moment when the tip of the material to be rolled is caught in the work roll, the material to be rolled suddenly meanders to one side of the width, and competes with a side guide (not shown) to clog up. Further, it is possible to prevent the trouble that rolling cannot be continued any more and stop, and the quality, yield, operation availability, and overall effect are brought about.

The figure which showed the case of the single cross about the operation | movement of each component of the cross roll rolling mill at the time of applying this invention as an example Similarly, a diagram showing the case of both crosses as an example The figure which showed the whole layout of the hot rolling line of the strip which is one of the application objects of this invention, and its component equipment The figure which compared the relation between the command value and the actual value of the plate crown before and after the application of the present invention The figure for demonstrating the relationship between the to-be-rolled material width direction position and the up-and-down work roll opening degree in a cross roll rolling mill The figure which compares the rolling state by the rolling mill before the appearance of the cross roll rolling mill and the cross roll rolling mill Perspective view for explaining the principle of a single cross rolling mill Side view for explaining the structure of a single cross rolling mill Side view showing housing contraction The figure for demonstrating the case where the last cross angle adjustment operation direction and this operation direction are the same with the single cross of a prior art The figure for explaining the problem when the previous cross angle adjustment operation direction and the current operation direction are opposite in the same cross The figure for demonstrating the case where the previous cross angle adjustment operation direction and this operation direction are the same in both crosses of the prior art Similarly, for both crosses, a diagram for explaining the problem when the previous cross angle adjustment operation direction and the current operation direction are opposite

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Rolling machine housing 4 ... Cross head liner 6 ... Backup roll 8 ... Work roll 10 ... Backup roll chock 12 ... Work roll chock 13 ... Chock liner 16 ... Baakup roll pivot block 18 ... Work roll pivot block 20 ... Cross head 22 ... Screw 24 ... Nuts 30 ... Heating furnace 32 ... Rough rolling mill 34 ... Crop shear 36 ... Descaling device 38 ... Finishing mill 40 ... Cooling zone 42 ... Coiler 50 ... Rolled material 60 ... Control device 70 ... Process computer 90 ... Business Computer 100 ... Hot rolling line

Claims (2)

When adjusting the cross angle to the set value that is the control target by operating the cross roll of the cross roll mill work roll,
If you want to perform a cross angle operation this time in the direction opposite to the direction in which the cross angle operation was performed when the cross angle was adjusted immediately before,
Even after the cross angle reaches the set value as the control target, the cross angle operation continues.
When the cross angle exceeds the set value as the control target for the clearance equivalent to the clearance between the cross head and the work roll chock, which is on the side where the cross roll operation is performed at this time, the cross angle is exceeded. Stop the operation of
Thereafter, the cross roll rolling mill work roll is characterized in that the cross angle is moved in the direction opposite to the direction of the cross angle operation this time, and the cross angle is adjusted so as to reach the control target set value. Cross angle adjustment method.   A rolling method using a cross roll rolling machine, wherein rolling is performed by adjusting the cross angle by the method according to claim 1.

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