WO2000058039A1 - Method of winding strips - Google Patents

Abstract

A method of winding strips wherein in order to prevent a preceding strip from lingering at the outlet side of winding pinch rolls and prevent the front end of a following material from lingering at the inlet side of the winding pinch rolls, a strip fed out of a rolling mill is cut to a predetermined length by strip shears (102) and the cut strip is wound on the mandrel (107) of a winding device (104) via winding pinch rolls (105) disposed at the outlet side of the strip shears (102), the peripheral speed of the winding pinch rolls (105) after the tailing end of the strip to be wound on the mandrel (107) via the winding pinch rolls (105) has been cut by the strip shears (102) being higher than the speed at which the following material is transferred immediately after the cutting and lower than the winding speed at which the strip is wound on the mandrel (107).

Description

 Description Strip winding method Technical field

 According to the present invention, a strip fed from a hot rolling mill is cut into a predetermined length by a strip shear, and the cut strip is wound on a winding pinch disposed on the exit side of the strip shear. The present invention relates to a method for winding a strip which is wound by a mandrel of a winding device via a roll. Landscape technology

Fig. 16 shows the general outline of a general continuous hot rolling line. Conventionally, when a strip cut to a predetermined length by a strip shear is alternately wound by a preceding material winding device and a following material winding device, switching of the winding device has been performed as follows. As an example, a case where switching from the preceding material take-up device a to the following material take-up device b will be described. A strip d sent from the finishing mill c is transferred to the downstream of the finishing mill c. Rippusha one e prior to cutting to length a strip d, and Kogyosu Bok lips d ₂ and then binary split, leading strip and Kogyosu Bok lip d ₂ respectively preparative preceding material winding apparatus a and the trailing It is wound by the material winding device b.

While the preceding strip is being wound by the preceding material take-up device a, the lower pinch port g of the winding pinch roll f arranged at the outlet side of the strip shear e is moved to the upstream side. By changing the offset angle of the take-up pinch roll f, the transport direction of the strip is switched in advance from the preceding material take-up device a to the succeeding material take-up device b, and the leading strip becomes the take-up pin. Immediately after passing through the chill roll f, the trailing strip d ₂ is invited to the trailing material winding device b And guide and wound by the following material winding device b the rear row string-up d _2. At this time, to prevent the trailing strip d ₂ is gradually penetrate the preceding material winding device a side by a triangular gate j.

 In recent years, a force roselle reel type winding device has been used as a winding device for continuous hot rolling.

 FIG. 20 schematically shows an example of a continuous hot rolling line in which a force-roiling reel type winding facility is arranged.

The power roselle reel type winding device is provided with first and second mandrels 1 and 2, and the first and second mandrels 1 and 2 are arranged such that when one is at the winding start position, the other is at the winding start position. They are arranged on the orbit 3 so as to be pivotally separated from each other in the circumferential direction so as to be located at the winding end position. Then, for example, when the first mandrel 1 is located at the winding start position, after a predetermined amount of the preceding strip sent out from the finishing mill 4 by the first mandrel 1, the preceding strip S! While winding the pivoted first the mandrel Le 1 to卷取end position, prior string Tsu tail edge of the scan Bok Rippusha one 5 in the winding starts to tip of the trailing strip S ₂ is cut in flop in this state The second mandrel 2 located in the position winds. Note that after the winding of the strip at the winding end position is completed, the payout wound up leading strip S, the coil from the mandrel 1, command barrel 1 winding the leading end of the strip following the trailing strip S ₂ It will be in a standby state until it is attached.

In addition, above and below the upstream pass line P, which faces the mandrel (the first mandrel 1 in the figure) at the winding start position, an upstream thread guide that guides the tip of the strip S toward the upstream mandrel. 6 to 13 are arranged, and the winding ends at the upper and lower sides of the downstream pass line P ₂ diverging from the upstream pass line P, and heading to the mandrel at the winding end position (the second mandrel 2 in the figure). Rank There are provided downstream side guides 13 to 15 and guide rollers 20 for guiding the strip S to be wound around the mandrel. Incidentally, the sheet passing guide 1 3 upper guide and the downstream Pasura in P ₂ against the lower guide disposed position of the upstream pass line P, the downstream pass line P ₂ from branches for upstream pass line And also serves as.

 Further, in FIG. 20, reference numeral 16 denotes a pass line P, a pinch roll disposed between the finishing mill 4 and the strip shear 5, and reference numeral 17 denotes a pass line P, at which the strip shear 5 exits. Is a winding pinch roll, 18 is an upstream wrapper roll arranged so as to be able to move closer to and away from the outer peripheral surface of the mandrel at the winding start position, and 19 is a winding end position. These are downstream rolls arranged on the outer peripheral side of the mandrel so as to be able to move close to and away from each other, and the upper and lower wrapper rolls 18 and 19 and the upper guide 14 of the downstream side plate guide. When the first and second mandrels 1 and 2 turn on the orbit 3, they move away from the orbit 3 to allow the turning.

However, in the former conventional method of winding a strip in a hot rolling line, if the strip is cut by a strip shear e, the finishing mill c and the preceding material winding device a As a result, the tension applied to the strip is released, and the tail end of the preceding strip is loosened on the exit side of the winding pinch roll に as shown in Fig. 17, and in the worst case, the tail of the preceding strip is There is a problem that the end is hooked on the triangular gate j and the plate is broken, and furthermore, after the tail end of the preceding strip S i has passed through the winding pinch roll f, the winding is temporarily stopped. circumferential speed of the pinch preparative roll f is will be summer slower than the conveying speed of the rear row strip S _2, Kogyosu Bok lip

There was also a problem that the tip of S 2 was loose on the entry side of the winding pinch roll f.

On the other hand, in a hot rolling line equipped with a car In the conventional strip winding method, the mandrel at the winding end position is also used.

When the strip is cut by the strip sha 5 while the preceding strip S, is being wound by the (second mandrel 2), the strip is applied to the strip by the finishing mill 4 and the mandrel on the downstream side. When the tension was released, the preceding strip S, as shown in FIG. 21, stuck on the exit side of the take-up pinch roll 17 arranged on the exit side of the strip shear, and in the worst case, leading strip S, but there is a problem that the plate is damaged caught by the leading end of the downstream side plate guide 1 3 at the branch position of the upstream pass line P, a downstream side pass line P _2, further, leading strip S the tail is after passed through the winding pinch rolls 1-7, temporarily circumferential speed of the pinch rolls 1 7 preparative take-is will be summer slower than the conveying speed of the trailing scan Bok lip S _2, the trailing string -up S ₂ the tip of the pin for the winding Problem Mau to Dabutsui at entrance side of the roll 1 7 also occurred.

 SUMMARY OF THE INVENTION The present invention has been made to solve such a disadvantage. After the tail end of a strip wound by a mandrel is cut by a strip shear, the strip is moved out of the strip shear. It is possible to prevent looseness on the exit side of the take-up pinch roll arranged at the same time, and to prevent the tip of the following strip from loosening on the entry side of the take-up pinch roll. It is an object of the present invention to provide a method of winding a strip. Disclosure of the invention

In order to achieve the above object, the strip winding method of the present invention cuts a strip fed from a rolling mill into a predetermined length by a strip shear, and cuts the cut strip into the strip shear. In a method of winding a strip, the strip is wound by a mandrel of a winding device via a pinch roll for winding arranged on the exit side of the strip. The peripheral speed of the winding pinch roll after cutting the tail end of the strip wound on the mandrel via the winding pinch roll with the strip shear is the same as that immediately after the cutting. It is characterized in that the speed is higher than the conveying speed of the row material and lower than the winding speed of the strip by the mandrel.

 According to the present invention, the strip after cutting is subjected to a pulling force acting between the strip shear and the winding pinch roll toward the downstream side, and the downstream side between the winding pinch roll and the mandrel. Since the bowing force acts, the leading strip can be prevented from loosening on the exit side of the winding pinch roll, and the peripheral speed of the winding pinch roll can be reduced immediately after the cutting. Since the transport speed of the following material is higher than that of the following material, it is possible to prevent the leading end of the following material from loosening on the entrance side of the winding pinch opening.

In this case, the mandrel is a mandrel of a carousel-type winding device, and after cutting the tail end of a strip wound on the mandrel through the winding pinch roll by the strip shear. The relationship between the set winding speed V _ra of the _mandrel of the above, the target speed V _P of the winding pinch roll at the time of the cutting, and the plate speed V _s of the following material immediately after the cutting is represented by V _m > By setting V p> V s, the leading strip is caught at the end of the thread guide at the branch position between the pass line toward the mandrel at the winding start position and the pass line toward the mandrel at the winding end position. Can be prevented.

Further, the strip cut to a predetermined length by the strip shear is passed through a first winding pinch roll arranged on the exit side of the strip shear and the mandrel of the upstream winding device and the downstream mandrel. In a strip winding method in which the winding is alternately wound by a mandrel of a winding device, the stripping method includes a second winding pinch roll disposed on an inlet side of a downstream mandrel. To the target speed V _{P l} of the second pinch roll卷取after cutting the tail of the scan Bok lip to be wound into the downstream side mandrel the string Ppushiya, the first卷取pinch rolls The relationship between the target speed V _P2 of the following material, the target plate speed V _s of the succeeding material immediately after the cutting, and the set winding speed V _m of the downstream mandrel is defined as V _m > V _PI > V _pZ > Vs. It is possible to prevent the strip from being damaged due to the tail end of the strip catching on the triangular gate.

 In this case, after offsetting the lower pinch roll of the first winding pinch roll, the tail end of the strip wound on the downstream mandrel via the second winding pinch roll. In the state where the speed of the first lower pinch roll is set to be lower than the target plate speed Vs of the succeeding material, the upper pinch roll of the first winding pinch roll before cutting is performed by the strip shear. The strip is pressed until the actual torque value of the first lower pinch roll reaches a predetermined set value, and the upper pinch roll is pressed when the pressing force at this time is offset. By setting the pressing force to the lip, the tail end of the strip wound around the downstream mandrel can be satisfactorily held by the first winding pinch roll.

Further, prior to continuously winding the strip cut by the strip shear by the mandrel through the winding pinch port arranged on the exit side of the strip shear, the winding pinch is used. By setting the pressing force of the roll to be equal to or greater than the P value determined by P = 2F (Au / Ax) + 4 (MB / ΔΧ) {( _1A / RL) + ( _1b / Ru)}, Since the pressing force of the upper pinch roll can be set to the most appropriate value, it is possible to prevent the tail end of a thin strip from being broken or the thick strip from being poorly guided to a winding device.

In this case, after the pressing force is set, the gap of the winding pinch roll is removed. By holding from the stripping of the preceding strip to the penetration of the following strip, it is possible to prevent the following strip from being impregnated into the take-up pinch roll.

 Further, before finishing the winding of the strip by the mandrel, the winding control of the strip by the mandrel is switched from the torque control to the rotation speed control, and thereafter, the strip is wound into a coil. By stopping the rotation of the mandrel by pressing the holding hole, the deceleration of the coil due to the contact of the holding roll is eliminated, so that loose winding of the outer winding of the coil and winding defects such as a telescope can be avoided, and When the rotation of the coil is stopped after the winding of the strip is completed, the rotation of the coil can be stopped in a short time because the pressing roll has a braking force.

 Further, before the winding of the strip by the mandrel is completed, the strip is torque-controlled by the mandrel so as to increase the tension of the strip. By stopping the rotation of the mandrel by pressing the mandrel, the deceleration of the coil due to the contact of the presser roll can be prevented, and the occurrence of loose winding of the outer winding of the coil and the occurrence of poor winding such as a telescope can be avoided, and the strip After stopping the winding of the coil, when the rotation of the coil is stopped, the rotation of the coil can be stopped in a short time because the holding hole has a braking force.

Further, after the strip is cut by the strip shear, when the leading end of the following material enters the winding pinch roll arranged on the exit side of the strip shear, the winding pinch roll is By setting the torque limit on the deceleration side in the drive device of the winding pinch roll so that the peripheral speed is faster than the conveying speed of the following material, the bending rigidity of the thick dog is increased. Even in the case of a trip, the trailing material can be prevented from loosening on the entrance side of the winding pinch roll. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is an explanatory diagram for explaining a strip winding method according to a first embodiment of the present invention.

 FIG. 2 is an explanatory diagram illustrating an example of an operation pattern (speed pattern) of each part at the time of strip cutting and winding.

 FIG. 3 is an explanatory diagram illustrating the state of the leading strip and the trailing strip from the time of cutting the strip to the time after the cutting.

 FIG. 4 is an explanatory diagram for explaining a strip winding method according to a second embodiment of the present invention.

 FIG. 5 is a view for explaining a strip winding method according to a third embodiment of the present invention, and is a schematic perspective view of a driving mechanism of a winding pinch roll on the side of the stripper.

 FIG. 6 is a graph showing the change over time in the rotation speed and load torque of the take-up pinch roll on the exit side of the strip shear when the torque limit on the reduction side is set.

 FIG. 7 is a graph showing the change over time in the rotation speed and load torque of the winding pinch roll on the strip shaft exit side when the torque limit on the reduction side is not set.

 FIG. 8 is a diagram used for describing the fourth embodiment of the present invention, and is a diagram illustrating a dynamic model of a winding coil.

 FIG. 9 is a graph showing the measurement results of the speed and torque of the mandrel at the end of winding.

Figure 10 shows the measurement of mandrel speed and torque at the end of winding. It is a graph showing a result.

 FIG. 11 is a diagram used for describing the fifth embodiment of the present invention, and is a graph showing the relationship between the pushing force of the strip by the upper pinch roll and the pushing amount by the pinch roll for winding.

 Fig. 12 is a time chart of the pressing force of the strip by the upper pinch roll and the cylinder oil injection command.

 Fig. 13 is a time chart of the pressing force of the strip by the upper pinch roll and the cylinder oil injection command.

 FIG. 14 is a side view of the winding pinch roll when it is offset. Fig. 15 is a side view when the strip is pushed down by the upper pinch roll for the winding pinch roll.

 FIG. 16 is an overall schematic view of a general continuous hot rolling line.

 FIG. 17 is an explanatory diagram for explaining the looseness of the tail end of the strip on the exit side of the winding pinch roll.

 FIG. 18 is an explanatory diagram for explaining a problem when the pushing force of the strip by the upper pinch roll is small.

 FIG. 19 is an explanatory diagram for explaining the looseness of the leading end of the following strip on the entry side of the winding pinch roll.

 FIG. 20 is a view schematically showing a power rosell-type winding facility.

 FIG. 21 is an explanatory diagram for explaining the looseness of the tail end of the strip at the exit side of the winding pinch roll. BEST MODE FOR CARRYING OUT THE INVENTION

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

First, a method of winding a strip in a general hot rolling line according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 schematically shows a portion of the continuous hot rolling line on the downstream side of the strip shear. In this embodiment, a finishing mill (not shown) is used.

. ) Is cut into a predetermined length with a strip shear 102, and the preceding strip is wound on a downstream winding pinch roll (a second winding pinch opening). 0 3 with take wind-by mandrel 1 0 7 downstream retractor 1 0 4 via a Kogyosu Bokuri-up S ₂ a string Ppushi yer 1 0 2 outgoing arranged upstream around the side An example will be described in which the winding is performed by the mandrel 107 of the upstream winding device 101 via the pinch opening 101 (first winding pinch opening 105).

 Both the downstream winding device 104 and the upstream winding device 101 rotate the mandrel 107 as a means for pulling the strip wound around the mandrel 107 with a predetermined winding tension. Detect the torque of the motor 1 08 to be driven. The motor 1 108 is filtered so that the detected torque value obtained by the torque detector 1 09 and the torque detector 1 0 9 matches the target torque value. Torque control device 110 to maintain the strip tension at a constant level by performing feedback control, pilot nozzle 1101 (PLG) 111 to detect the rotation status of motor 108, and pilot generator 1 And a speed control device for feedback control of the motor so that the detected speed value obtained by the control unit matches the target speed.

The downstream winding pinch roll 103 has a torque detector 114 for detecting the torque of the motor 113 of the lower pinch roll 103a and a pie for detecting the rotation state of the motor 113. Speed control for feedback control of motor 113 so that the speed detection value obtained by mouth generator (PLG) 115 and pilot generator 115 matches the target speed V _pl Device 1 16.

In addition, the upstream pinch roll 1 Q5 is also the same as the lower pinch roll 1 Q5. 0 5a Motor 1 17 Torque detector 1 18 to detect torque, Pilot generator overnight (PLG) 1 19 to detect rotation status of motor 1 17 and Pilot generator 1 speed detection value obtained by 1 9 and a speed control device 1 2 0 for feedback control of the motor 1 1 7 to match the targets velocity V _{p 2.} The lower pinch roll 105a can be moved along the pass line to the upstream side when changing the offset angle when switching from the downstream winding device 104 to the upstream winding device 101, and the upper pinch roll. The roll 105b is capable of pressing the strip via a hydraulic cylinder 122 to push the strip down. Further, a pressing force detector 122 for detecting a pressing force applied to the upper pinch roll 105b is attached to the upper pinch roll 105b.

 The pressing force applied to the upper pinch roll 1 0 5 b via the hydraulic cylinder 1 2 1 is determined by the detected pressing force obtained by the pressing force detector 1 2 2. Feedback valve 1 2 7 that switches oil supplied from hydraulic pump 1 2 6 to hydraulic cylinder 1 2 1 is fed back by pinch roll pressing force controller 1 2 5 so that it matches the pressing force. It is determined by controlling. Note that the pinch roll pressing force control may be performed by an air.

Next, the case of switching from the downstream winding device 104 to the upstream winding device 1G1 will be described. First, the leading strip S, is changed by the mandrel 107 of the downstream winding device 104. During winding, the lower pinch roll 105a of the upstream winding pinch roll 105 is moved to the upstream side along a pass line by a hydraulic cylinder (not shown) or the like, and the By changing the offset angle of the upstream-side winding pinch roll 105, the transport direction of the strip is switched in advance from the downstream-side winding device 104 to the upstream-side winding device 101, and Immediately after the tape exits the upstream take-up pinch roll 105 Keep to the trailing strip S ₂ can be guided to the upstream side winding device 1 0 1 side. Incidentally, a triangular gate to prevent the code 1 2 8 tip of the trailing strip S ₂ is gradually penetrate the downstream winding device 4 side in FIG.

In the case where the strip is cut by the stripper 102 with the preceding strip S, wound around the mandrel 107 of the downstream winding device 104, the present invention provides: when performing the cutting, winding device 1 0 4 speed control device 1 1 2 according to the prior scan Bok lip S, the set winding speed V _m, pinch rolls preparative upstream winding 1 0 5 side of the speed controller Target speed V _{P 2} for 1 20, downstream pinch roll 1 0 3 Speed controller 1 3 Target speed V _{P 1} for 1 6, and transport speed V _s of succeeding strip S ₂ immediately after cutting the (= switching the conveying speed of the cross-sectional immediately preceding string-up), depending on the host computer (not shown), set such that _{V m> V P l> V} P 2> V s.

 The details will be described below.

 Now, when the leading strip S i is wound around the mandrel 107 of the downstream wind-up device 104 and the cutting of the strip by the strip shears 102 is completed, the cut is completed. The cut-off completion signal is sent from the stripper 102 or the host computer to the speed control device 1 1 2 of the downstream winding device 104, and the speed control device 1 1 of the pinch roll 1 103 for the downstream winding. 6, and the speed control device 120 of the upstream winding pinch roll 105 are notified, respectively.

The disconnection completion signal is time t. At the time t. In the evening, the mandrel 107 of the downstream winding device 104 switches from the tension control by the torque control device 110 to the speed control by the speed control device 112. At the same time t. In the evening, the speed control device 1 1 2 starts accelerating the winding speed of the strip, As such, the acceleration rate Bok final speed V _m after the end of acceleration in X starts the speed control such that the following equation (1).

V _m = V s XA… (1)

Here, V s is the transport speed of the strip immediately before cutting, and A is the lead rate (coefficient for determining the final speed).

The state of the preceding strip S i and the following strip S ₂ at time t 0 is as shown in FIG.

Time t of the start of the acceleration. During the delay time T1 from the time t to the time t, the speed of the downstream winding pinch roll 103 is cut off by the speed control device 116 of the downstream winding pinch roll 103. The previous strip speed V s is maintained. When the time comes, the speed control device 116 starts accelerating the speed of the downstream winding pinch roll 103, and as shown by the curve II in FIG. — Start speed control so that the final speed V _spl after acceleration ends at Y with the following equation (2). The delay time T1 is measured by the timer of the speed control device 116 or a host computer.

V _Pl = V s XB… (2)

Here, B is the lead rate, and the relation between lead rates A and B is A> B. Furthermore, the time t of the start of acceleration. Between the delay time T 2 of the up to time t ₂ is more to the speed control device 1 2 0 pinch rolls 1 0 5 preparative upstream winding, the speed of the upstream-side take-pinch roll 1 0 5 cutting The previous strip speed is maintained at Vs. And power, and, at a time t _2, the speed control device 1 2 0 in together when starting the acceleration of the speed of the upstream winding take-up Vinci roll 1 0 5, as shown by the curve III 2, the When the acceleration rate is Z, speed control is started so that the final speed _VP2 after the end of acceleration becomes the following equation (3). Note that the above delay time T 2 is measured by the timer of the speed control device 120. The delay time T 1 and T 2 are set to T 1 <T 2.

V _P2 = V s XC (3)

Here, C is the lead rate, and the relationship between the lead rates B and C is B> C. Then, at time t _3, as shown in FIG. 3 (B), and after the tail end of the preceding string-up S i between the pinch rolls 1 0 5 and string Ppusha one 1 0 2 preparative upstream winding tip line string-up S ₂ is located respectively, prior scan Bokuri Tsu ing sufficiently distant state with the tip of the flop S i of the tail and the following string-up S _2.

Furthermore, as shown in FIG. 2, at time t ₄ downstream retractor 1 0 4 of the mandrel 1 0 7 winding speed final speed V _m becomes, at time t ₅ when the pinch roll preparative downstream winding 1 0 3 speed final speed V _[rho, next, the speed of the pinch rolls 1 0 5 for upstream winding At time t ₆ is the final velocity V _{P 2.}

Then, at time t _7, FIG. 3 (C), the preceding scan tripping S between the pinch rolls 1 0 5 preparative upstream winding and the pinch rolls 1 0 3 preparative downstream winding, with the tail is located in, the state in which the leading end of the trailing string-up S ₂ reaches the pinch roll 1 0 5 preparative upstream winding.

The speed ratio y of the final speed V _m and the final speed V _pl speed ratio x, and final velocity V _{P l} and the final velocity V _P2 is as follows.

_{x = (A · V m)} / (B · V P 1) = A / B ··· (5)

y = ( _BVpl ) / (C- _VP2 ) = B / C (6)

 Therefore, for example, if the lead rates A, B, and C are A = 1.5, B = 1.1, and C = 1.05, the speed ratios x and y are as follows.

 Speed ratio x = (1.5 / 1.1) = 1.0.45 (7 A)

Speed ratio y = (l. 1 / 1.05) = 1.0.48 "-(7B) It is preferable that the lead rates A, B, and C are large in view of the winding property of the winding device 104 downstream of the strip, but if it is large, deceleration energy during winding is added to the strip. Therefore, over tension occurs in the strip after finish rolling and the width of the strip shrinks, which causes quality problems. Therefore, the winding property is first determined empirically according to the sheet thickness.

 Further, the above-mentioned speed ratio X is secured also in the speed ratio of the downstream winding device 104 and the downstream winding pinch roll 103 in the acceleration process, and the downstream winding pinch roll 10 It is preferable that the above-described speed ratio y is secured also in the speed ratio of the acceleration process between the pinch roll 3 and the upstream winding pinch roll 105.

 In order to ensure the above-mentioned speed ratio X in the speed ratio between the downstream winding device 104 and the downstream winding pinch roll 103 during the acceleration process, the following expression is obtained using the expression (5). Holds.

 (V s + XT 1) / V s = A / B (8)

 Here, X is the acceleration rate of the downstream winding device 104, and T1 is the delay time shown in FIG.

 By transforming this equation (8), the delay time T 1 becomes the following equation, and the delay time T 1 may be set as in the following equation.

 T 1 = (V s / X) (A / B 1) (9)

 Similarly, in order to secure the above-mentioned speed ratio y in the speed ratio of the acceleration process between the downstream winding pinch roll 103 and the upstream winding pinch opening 105, the following equation is required. To establish.

 T 3-(V s / Y) (BZC— 1)-(1 0)

However, Y is the acceleration rate of the winding pinch roll 103, and T3 is the upstream winding pinch from the start of acceleration of the downstream winding pinch roll 103, as shown in FIG. This is the time until the start of roll 105 acceleration. Therefore, the figure The delay time T2 shown in 2 may be set so that T2 = (T1 + T3).

Furthermore, downstream卷取device 1 0 4, downstream take-pinch roll 1 0 3, and acceleration of the upstream winding pinch rolls 1 0 5, the Gyosu Bok Clip S ₂ after being cut It must be completed before the leading end reaches the upstream winding pinch roll 5. That is, it is necessary that the relationship between the times t ₄ , t ₅ , t ₆ , and t ₇ shown in FIG. 2 satisfy the following condition.

t ₇ >, t ₇ > t ₅ , t ₇ >"... (1 1)

 Next, an example of the above conditions will be specifically described below.

For example, the distance between the upstream winding pinch roll 105 and the strip shear 102 is 10 Cm), the speed V s immediately before cutting the strip (= the following strip immediately after cutting). When the conveyance speed V _s) of S ₂ and 9 0 0 [mpm], the time to the line string-up S ₂ after subsequent cutting reaches the pinch roll 1 0 5 preparative upstream winding, 1 0 mZ (900 mp mZ 60 sec) = 0.67 [sec].

Further, the read rate A A = l. 1 when 5 to the final speed V _m of the mandrel 1 0 7 downstream retractor 1 0 _{4, V m = 9 0 0 X} 1. 1 5 = 1 0 3 5 [mpm]. In addition, the acceleration rate X accelerates the speed from 900 Cmp m] to 1035 mpm during 0.67 [sec], so that (1035-900) ) / 0.67 = 2 0 1 [mpm / s].

By performing such a speed setting, the strip S after cutting has a V Vs between the stripper 102 and the winding pinch roll 105 because the V S is equal to V Vs. the pinch roll 1 0 5 pulling force acts to toward the downstream side, take-up for a V _{P l>} V _p2 is between the pinch rolls 1 0 5 and the take-up pinch roll 1 0 3 roll-up A pulling force acts downstream by the pinch roll 103 for winding, and the pinch roll 103 for winding takes Force pulling to the downstream side is applied by the mandrel 1 0 7 for a V _m> V _pl in between the mandrel 1 0 7 downstream卷取device 4.

Therefore, the exit side of the winding pinch roll 105, that is, between the winding device 104 and the downstream winding pinch roll 103 and between the downstream winding pinch roll 103 and the upstream side The trailing end of the preceding strip S, can be prevented from sticking to the winding pinch roll 105, and as a result, the trailing end of the leading strip S, gets caught on the triangular gate 26. breakage of the strip can also be prevented, and further, V _{P 2>} V _S and to feedrate of the winding pinch port Ichiru 1 0 5 becomes faster than the conveying speed of the trailing string-up S ₂ Since the speed is set to, it is possible to prevent the leading end of the trailing strip S _{2 from} loosening on the entrance side of the winding pinch roll 105.

 If the pushing force of the upper pinch roll 105 b when the offset angle of the upstream take-up pinch roll 105 is changed is weak, the take-up pinch roll 1 of the downstream take-up device 4 will not work. Since the tail end of the strip to be wound at 07 cannot be sufficiently held by the upstream winding pinch roll 105, the tail end of the strip is at the upstream winding pinch roll 10 5 causes slippage without being sufficiently suppressed, and as shown in FIG. 18, there is a looseness between the downstream winding device 104 and the upstream winding device 101. Therefore, in this embodiment, a pressing force that can reliably pinch the strip with the upstream winding pinch roll 105 is set, and before the cutting, the upstream winding pinch roll 105 is set. Preceding Strip S! Is securely clamped.

 The details are described below.

As shown in Fig. 1, the pressing force detector of the upstream winding pinch roll 105 is placed in the upper pinch roll 105b side, and the leading strip is located downstream. Wound around the winding pinch roll 107 of the winding device 104 When the offset angle of the upstream take-up pinch roll 105 is changed in the state of being held, the leading strip S, is pushed down from the pass line according to the offset amount of the lower pinch roll 105a. Strip S! Must be sandwiched between the upper and lower pinch rolls 105b and 105a. In the example shown in FIG. 1, the leading strip S, is pressed by the upper pinch opening 105b of the upstream winding pinch roll 105 via the hydraulic cylinder 122. The pressing force at this time is set by the compensating pressing force setting unit 1 2 4 o

The compensating push force setting device 124 has a leading strip S! With the upper pinch roll 105b and the lower pinch roll 105a for the upstream winding pinch opening 105. This is to set a compensating pushing force that securely clamps the upstream stripping pin 105. After the offset angle of the upstream winding pinch roll 105 has been changed, the strip S At an appropriate timing until the tail end is cut, the speed control device 120 is controlled to adjust the speed standard of the lower pinch roll 105a to the preceding strip S! Of slightly slower than the plate speed V _s, the set value is detected torque value T by the torque detector 1 1 8 preset in this state T. The feed-back control of the servo valve 1 26 is performed via the pinch roll pressing force control device 1 15 until the pressure becomes, and the strip S, is kept pressed.

When the speed reference of the lower pinch roll 105 a is slightly lower than the plate speed V _s of the preceding strip S, the leading strip S! When the lower pinch roll 105a is not pressed, the torque of the lower pinch roll 105a is not large because the load is not applied to the lower pinch roll 105a. , Is pressed, leading strip S! Causes a slip between the lower pinch rolls 105a and the load (tornolek) increases. Using this, the compensation set pushing force (in this case, the leading strip S, is sandwiched between the upper pinch roll 105b and the lower pinch roll 105a). Estimate P _s (N).

That is, the force P _s (N) for sandwiching the leading strip S, between the upper pinch roll 105b and the lower pinch opening 105a, is equal to the leading strip and the lower pinch roll 1◦5. the speed difference between a Δ ν (mpm), the coefficient of friction of the preceding string-up and lower pinch rolls 1 0 5 a to change the speed difference Δν ₂ (Δ V), the lower pinch roll 1 0 5 a performance When the torque is T (Nm) and the radius of the lower pintilol 105 a is r (m),

Ps = Ύ / [r · // ₂ (Δ v)]… (1 2)

Therefore, if the value of / _{2 at} a given speed difference Δν is obtained in advance from equation (1 2), then the compensation set pushing force Ps can be obtained by measuring the actual torque の at the lower pinch opening. Can be.

In the pressing force setting method using the compensating pressing force setter 124, the upstream winding is performed to such an extent that the tail end of the preceding strip S is not knocked even if the cutting is performed by the strip shear 102. The compensation setting pushing force P s! That can pinch the strip with the pinch roll 105 The obtained beforehand, when the Shitapi Nchiroru 1 0 5 a speed settings before the cut set slower by a predetermined speed delta [nu than the strip S, the plate speed V _s, wherein the compensation set pushing force P s The torque value T of the lower pinch roll 105 a when Is set in advance in the compensating push force setting device 1 2 4. Then, before the compensation pressing force setter 1 2 4 to perform the disconnect, the speed control device 1 2 0 as the speed of the lower pinch roll 1 0 5 a slow only Δν than the plate speed V _s After sending a signal to the lower pinch roll 105a, measure the actual torque Τ of the lower pinch roll 105a using the torque detector 118, while pressing the strip S, with the upper pinch roll 105b. To the pinch roll pressing force controller 1 2 5 Then, the actual torque T is T. The above value is assumed. Therefore, strip S, The state can be reliably held by the pinch roll 105 for winding on the upstream side. In this state, the preceding strip S! Make a cut at the tail end.

Thus, capturing the case of using the償押to force setter 1 2 4, prior since strip has set up 3 actual force the press into account forces exerted on _1, the upstream side winding preceding strips Pinch roll 105 and the upper pinch roll 105 b and the lower pinch mouth 105 a can be securely pinched to prevent the occurrence of slip, and as a result, the leading strip S ₁ The looseness between the downstream winding device 1 at the tail end and the upstream winding device 6 can be prevented well.

Incidentally, control of the _{V m> V pl> V p} 2> V s by host computer, pressing the leading strip by compensating pressing force setter 2 4 prior strip S, the winding device tail is the downstream side of the 1 The operation is performed until the mandrel 104 of the 04 is wound up.

 Further, in this embodiment, the case where the strip is wound by the mandrel 107 of the downstream winding device 104 has been described, but the strip is wound by the mandrel 107 of the upstream winding device 101. The present invention can be applied to a case in which is wound.

 Next, with reference to FIG. 4, a method of winding a strip in a hot rolling line provided with a force rosell-reel type winding facility according to a second embodiment of the present invention will be described. The basic structure of the carousel-type winding equipment and the continuous hot rolling line are the same as those described in the conventional example (Fig. 20 and Fig. 21). The description is omitted by attaching the reference numerals.

FIG. 4 schematically shows a portion of the continuous hot rolling line on the downstream side of the strip shear. In this embodiment, a finishing mill (not shown) is used. . ) Is cut into a predetermined length with a stripper 15, and the preceding strip S, is taken up by a winding pinch roll 1 disposed on the exit side of the stripper 15. The mandrel at the winding end position (the second mandrel 2 in the figure) at the winding end position via 7 and the trailing strip S ₂ at the winding start position via the winding pinch roll 17. (In the figure, the case of winding by the first mandrel 1) is taken as an example.

 The second mandrel 2 located at the winding end position includes a motor 3 2 for rotating and driving the mandrel 2 as a means for pulling the strip wound around the mandrel 2 with a predetermined winding tension. The torque detector 34 detects the torque of the motor, and the motor 32 is feedback-controlled so that the detected torque value obtained by the torque detector 34 matches the target torque value. The torque detection device 36 that maintains the tension of the motor constant, the pilot generator (PLG) 38 that detects the rotation state of the motor 32, and the speed detection value obtained by the A speed control device 40 that performs feedback control of the motor 32 so as to match the speed.

Similarly, the first mandrel 1 located at the winding start position also serves as a means for pulling the strip wound around the mandrel 1 with a predetermined winding tension. The torque detector 33 that detects the torque of 1 and the motor 31 are fed back and stripped so that the detected torque value obtained by the torque detector 33 matches the target torque value. The torque detection device 35 maintains the tension of the motor constant, the pilot generator (PLG) 37 detects the rotational state of the motor 31 and the speed detection value obtained by the pilot generator 37. A speed control device 39 for performing feedback control of the motor 31 so as to match the target speed. Further, the take-up pinch roll 17 has a speed obtained by a pilot generator 42 and a pilot generator 42 detecting the rotation state of the motor 41 of the lower pinch roll 17a. and a speed controller 4 3 the detected value to Fi one Donoku click control mode Isseki 4 1 so as to coincide with the target speed V _P. Winding pinch roll 17 Upper pinch roll 17b pushes the strip via hydraulic cylinder 44 for pressing the strip toward lower pinch roll 17a It is possible.

Next, the case of switching from the mandrel at the winding end position (the second mandrel 2 in the figure) to the mandrel at the upper winding start position (the first mandrel 1 in the figure) will be described. First, the preceding strip St The upper pinch opening 17 b of the take-up pinch roll 17 is held so that the strip S, is held by the take-up pinch roll 1 間 に while the second mandrel 2 takes up. Press down with hydraulic cylinder 4 4. In this state, the tail end of the strip S, is cut by the strip shear 5, but in this embodiment, the preceding strip by the speed control device 40 of the mandrel 2 after the cut is performed. and setting the winding speed V _m of the S i, and the target speed V _P for the speed control apparatus 4 3 of the winding pinch rolls 1 7 during cutting, leading string-up S immediately before cutting, the plate velocity and V _s the relationship, the host computer (not shown), set so that _{V m> V P> V s} .

By performing such a speed setting, the stripping S after cutting has a winding pinch because V _P > V s between the strip shear 5 and the winding pinch roll 17. force acts to pull the toward the downstream side by the roll 1 7, force acts to pull the downstream side by the mandrel 2 for a V _m> V _P of between the卷取pinch rolls 1 7 and the mandrel 2. Therefore, it is possible to prevent the leading strip from loosening on the exit side of the take-up pinch roll 17, and as a result, the leading strip is It is possible to prevent the plate from being damaged caught by the leading end of the downstream side plate moth I de 1 3 at the branch position between the pass line and the downstream pass line P _2, further, V _P> V _s and a winding since the feed speed V _P of the pinch rolls 1 7 is the speed set to be faster than the conveying speed V _s of the trailing strip S _2, the pinch roll roll-up the tip of Kogyosu Bok lip S ₂ The luggage can be prevented at the entrance of 1 mm. For the sheet speed V s, the actual value can be obtained from the target speed of the mandrel 2 immediately before cutting or the opening speed of the finishing mill, and the above condition is satisfied based on the actual value of the sheet speed V _s. V _m and V _P may be set as described above.

 Here, the strip can be tensioned by the finishing mill and the mandrel 2 until the above cutting is performed, and the winding control by the mandrel 2 controls the winding torque up to that point. Is preferred.

 That is, the feedback control of the motor 32 is performed so that the detected torque value of the motor 32 obtained by the torque detector 34 matches the target torque value, and the tension of the strip is maintained constant. Then, strip S! Shortly after cutting the tail end, the mandrel 2 is decelerated to stop rotation while holding the strip S wound up in a coil shape with the wrapper roll 19. After the rotation stops, remove two coils of strip S, from the mandrel.

Also, strip S! After the cutting, the tension cannot be applied between the finishing mill and the mandrel 2, so if the winding control by the mandrel 2 is switched from the torque control to the speed control after cutting, Until step S is performed, tension is applied to strip S] by torque control, and strip S! Can be wound on a tile, and after cutting, Strip S! The winding speed can be set to V _m> V p> V s as described above in. W

Note that the winding control of the mandrel 2 may be switched from torque control to speed control in advance before the preceding strip S, 5 is cut by the strip shear 5.

 Next, a method of winding a strip according to a third embodiment of the present invention will be described with reference to FIGS. Although this embodiment is applicable to the first and second embodiments, a case where the present embodiment is applied to the first embodiment will be described as an example. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals with reference to FIG. 1 and the description thereof is omitted.

Until string class tap is cut pinch 0 rolls 1 0 5 roll-up of the string Ppusha one delivery side rotates at the same speed as the string-up of the target plate velocity V _s (m / _s). When the strip is cut by the strip shear 102, the target plate speed V _p2 (m / s) of the winding pinch roll 105 is larger than the target plate speed V _{s of the} strip. is set to the preceding string-up S t set winding speed V _{m (m} / s) is set to a value larger than the target plate speed 5 V _p2 of the winding pinch rolls 1 0 5. For this reason, the rotation speed of the winding pinch roll 105 increases after the strip is cut. Then, preceding string-up 3 ₁ of the plate speed is trying to rise to the set winding speed V _m, pinch roll for the winding 1 0 5 preceding scan Bokuri-up S! The rotation speed of the take-up pinch roll 105 is reduced by the preceding strip S! May rise of the plate velocity to zero lured by rising to a value close to the set winding speed V _m.

At this time, the target plate speed V _P2 of the winding pinch roll 105 is set to a value smaller than the set winding speed V _m , that is, the plate speed of the preceding strip S, after cutting. The motor 11 Ί (drive device) of the lower pinch roll 105 a of the winding pinch roll 105 generates torque on the side that reduces the speed of the winding pinch roll 105. Therefore, after cutting, the load torque of the motor 1 17 changes from the forward rotation direction to the reverse rotation direction. And the preceding strike When the tail end of the rip passes through the take-up pinch roll 105, the take-up pinch roll 105 becomes a decelerating force <, and in the case of a strip with a large thickness and high bending rigidity, Since the leading strip S, due to the take-up pinch roll 105 has a large pressing force, the take-up pinch roll 105 is moved forward by the leading strip S! When the motor passes through the motor, the torque to the deceleration side of the motor increases, and the tail end of the preceding strip passes through the winding pinch roll. 0 during 5 of deceleration, V _{P 2>} V _S and also written to have the speed set Warazu, as shown in FIG. 7, string rotation speed is in instantaneous between manner of卷取pinch rolls 1 0 five- It becomes smaller than the target plate speed of up (the speed of the trailing string-up), to stabilize the subsequent mounting plate velocity V _{P 2.}

After the preceding string-up S, the tail has passed through the pinch roll 1 0 5 roll-up, the trailing string Tsu pinch roll 1 0 5 tip of flop S ₂ is the winding in嚙込Muma 0.3 seconds since extremely short as about, as described above, the tip of the trailing strip S ₂ is the winding when the rotational speed of the pinch rolls 1 0 5 roll-up is slower than the trailing string-up S ₂ plate velocity V _s When the pinch roll 105 is inserted into the take-off pinch roll 105, the strip feed speed of the take-up pinch roll 105 becomes slower than the plate speed of the succeeding strip S, as shown in FIG. However, the leading end of the trailing strip S ₂ will be loose on the entry side of the winding pinch roll 5.

Therefore, in this embodiment, the motor 1117, which is the drive device of the winding pinch roll 105, is provided with a torque limit _Tmax (Nm) on the reduction side, and the speed control device 120 the load torque of the motor 1 1 7 is controlling the motor Isseki 1 1 7 so as not to exceed the Bok Rukuri mission-Bok T _max deceleration side. Here, when the expected嚙the Kogyosu Bokuri-up S ₂ of the distal end pinch rolls 1 0 5 for the winding, as shown in FIG. 6, the rotation speed of the pinch rolls 1 0 5 preparative take-is so as not to become smaller than the plate velocity V _s of the trailing string-up S ₂ The value of the torque limit T _max can be determined in advance as follows.

Referring to FIG. 5, taking a case where lower pinch roll 105 a of winding-up pinch roll 105 is driven as an example, set motor 1 17 to drive lower pinch roll 105 a. will be described with the deceleration side should the Torukuri mitt T _Raax value.

The lower pinch roll 105a is rotationally driven by a motor 117 via gears 222 and 222. FIG. 5 shows a state in which the preceding strip S i is pressed by the pinch roll 105. In this state, the plate speed V _s of the preceding strip S, is lower than the lower pinch roll 1 Since the set plate speed V _{P 2 of} 0 5 a is greater than that of the lower pinch roll 1 0 5 a, only the force F (N) is applied from the preceding strip S, and the motor 11 1 1 opposes this. To generate torque TM (N-m).

At time t, the force that the lower pinch roll 105a receives from the preceding strip S i is F (t) (N), and the torque generated by the motor 117 is T _M (t) ( N · m), the lower pinch roll 1 0 5 a and the gear 2 2 1 inertial mode one member Bok the ^{J 2 (N · m 2)} , of the motor 1 1 7 and the gear 2 2 2 practices Seimoichime down bets J, (Ν · m ² ), preceding strip S! Immediately before the tail end passes through the winding pinch roll 105, the lower pinch roll 105 a has an angular velocity of ω 2 (radZ sec), and the motor 1 1 17 has an angular velocity of ω! (ra dZ sec), T (t) (Nm), the reduction ratio between gear 2 2 1 and gear 2 2 2 is i, and the lower pinch roll 1 0 5 a Assuming that the diameter is D (m), the following dynamic equation (13) holds. Here, the sign of T _M is assumed that the torque on the forward rotation side (acceleration side) is ten and the torque on the reverse rotation side (deceleration side) is one. ID d ω ₂

—— T (o -F _(t ) = J ₂ ··· (1 3) i 2 dt Also, between the motor 1 1 Ί and the gear 2 2 2, the following dynamic equation (1 4) D ω i

T _{M (t)} — T _(t ) two J, ··· (1 4) dt

From Equations (13) and (14), if T (t) is eliminated, the following equation (15) holds.

 D d ω,

T _{M (t)} — i ♦ F (. —— = (J i + J ₂ · i ² ) ··· (1 5)

 2 d t

When the equation (15) is integrated, the following equation (16) is obtained. t ₂ D

_{X Μ (t) - i ·} F (t) dt

^II 2

ω ₁ 2

= (J! Ten J ₂ · i ² ) J "d ω,

ω _{ί ί}

Where ω ΐ,, ω t 2 are the lower pinch at time, t 2, respectively. The angular velocity of the roll 105a. (1 6), the prior scan Bok lip S, the嚙tail from leaves the pinch opening Ichiru 1 0 5 for卷取, the pinch roll 1 0 5 tip of the trailing strip S ₂ is the winding Until it is filled, it is F (t) 20.

Here, the preceding scan Bok lip S, the tail is Komu seen嚙to pinch roll 1 0 5 for the winding is trailing strip S ₂ tip from the time it was only disconnect the pinch roll 1 0 5 for the winding (t = 0) when calculating the _{(t = t 2 (sec)} ) under pinch opening up Ichiru 1 0 5 a speed variation Δω (rad / sec). However, the sign of the change amount ωω is deceleration in the case of-, and acceleration in the case of +.

 Then, the expression (16) is expressed by the following expression (16Α).

 t 2 CO t 2

XT _M (t) dt = (J! + J 2 · i ² ) J * d ω]… (16 A)

⁰ ω ₀

T _{M (t)} is changed to the preceding strip S, the tail exit + side from T _max, the variation Δω stricter (large) to evaluate the direction, wherein the single pure to T _{M (t)} = _Assuming T _max , the following equation (17) holds.

 t 2 CO t 2

_{XT max • dt = (J 1} + J 2 - i z) X ά ω, - (1 7)

⁰ ω ₀

Solving equation (17) gives the leading strip S! The change Δω of the lower pinch roll t ₂ hours after the tail end of the pinch roll has pulled out the pinch roll is given by the following equation (18).

 I m a X * t 2

 Δω =, (1 8)

J i + J ^₂ · i ₂ Then, when the trailing string-up S ₂ tip conveying speed V _s of the long so meet the following equation (1-9), rear Gyosu at entrance side of the lower pinch roll 1 0 5 a Bokuri Tsu will not be generated looseness at the tip of the flop S _2.

D

V (ω Δω) (1 9) Here, ωο does not become smaller than the set angular velocity ω _Ρ2 of the lower pinch roll 105 a, so there is no problem even if approximating _ωο ^ ω _Ρ2 , the T _max for not dress generating looseness at the tip of the trailing string-up S ₂ at entrance side of the use pinch rolls 1 0 5 (1 8) and (1 9), the following equation (2 0 — The relationship of 4) should be satisfied.

D

 V: (, ω 0 + Δ ω

Τ, D

= (ω _Ρ20 ) x (2 0 — 1)

 J 1 + J

Vs x 2 T,

 CO p 2 (2 0 — 2)

DJ 1 + J (J, ten J 2 V

 ω P 2) ≤ T, (2 0-3)

D

2 (J! Ten J i ² ) (Vs -ω _ρ2 · D / 2)

 ≤ T,

 D t

... (2 0 4) where, from (2 0 _{4), Vs -ω ρ2 'Ό / 2} = Y S Ri one V _p2 der, since this is a V _P2> V _S, (2 It can be seen from equation 0-4) that _Tmax is greater than or equal to the value of-. That is, the deceleration-side torque limit is calculated.

Trailing strip S ₂ Transport speed V _s at the tip, moment of inertia J between motor 11 1 and gear 22, Moment of inertia between lower pinch roll 105 a and gear 22 1 J _2, the lower pinch roll diameter 0, reduction ratio i, the set angular velocity omega _{[rho] 2} of the lower pinch roll 1 0 5 a are known in advance, also the tail end of the preceding string-up is passed through the pinch roll 1 0 5 for卷取take credit after Gyosu Bokuri Tsu for the time t ₂ until the earlier end of the flop S ₂ is Komu seen嚙to pinch roll 1 0 5 for卷取, preceding the scan and the conveying speed V _s of the trailing string-up S ₂ Since the relationship with the winding speed V _m of the trip S, is known in advance, the value of T _ma that satisfies the above equation (20-4) may be set.

In this way, if the drive-side motor 117 of the winding pinch roll ₁₀₅ is set to the deceleration-side torque limit Traax, the winding pinch roll 105 will be cut after the strip is cut. during There are pressing the leading string-up S, previously row string-up S, the target winding speed V _m (downstream winding device 1 0 4 set winding speed) and卷取pinch rolls 1 0 5 Target plate speed V Based on the speed difference from _p2 As a result, the load torque on the decelerating side of the motor 1 17 does not become excessive, and immediately after the leading end of the preceding strip S, has passed through the winding pinch roll 105, the winding pinch roll 10 rotational speed of 5 does not become smaller than the plate velocity V _s of the trailing strip S _2.

 Next, a strip winding method according to a fourth embodiment of the present invention will be described with reference to FIGS.

 In strip winding in continuous hot rolling, a stable threading and winding is performed by applying tension to the strip between the finishing mill and the mandrel. Here, the means for imparting tension is generally based on the tension standard applied to the strip when winding, that is, according to the winding temperature conditions during winding and the steel type of the strip to be wound. By applying a tension reference that has been set in advance to an optimum value and generating a rotational torque that can apply a tension equal to the tension reference to the mandrel during winding, a tension control is performed. Has been implemented.

 By the way, in continuous hot rolling, the strip sent from the finishing mill is cut and wound around multiple mandrels alternately, so from the end of winding per mandrel to the start of winding of the next material. The coil (strip) after winding must be removed in a very short time, and preparation for the next winding must be completed in a short time. For this reason, it is necessary to stop the rotation of the mandrel after winding in a short time, but before the winding is completed, the wrapper roll (holding roll) is brought into contact with the surface of the strip wound in a coil shape. However, the rubber roll generates torque that hinders rotation of the mandrel during winding, and the mandrel itself is decelerated. As a result, the strip is loosened between the wrapper roll and the pinch roll, causing a phenomenon that the strip is loosened.

This phenomenon is simulated using a general hot-rolling winding model. Therefore, if the coil is considered as a rigid rotating body, a model as shown in Fig. 8 can be considered.

In other words, the inner diameter of the coil is a (m), the outer diameter is b (m), the tension acting on the strip is T (KN), the torque generated by the mandrel is T _MD (KNm), and the inertia of the coil is When the force is I c and the angular velocity is ω (rad / s), the kinetic equation for the coil is expressed as follows.

I c (d ω / dt)

(a / 2) T (b / 2)-4 F --- (2 1) where F is the tension generated by one roll of wrapper, and is used for winding equipment in general hot rolling mills. Is equipped with four wrapper rolls.

 In the above equation (21), before the wrapper roll comes into contact with the strip, the third term in the right equation is zero, and if the mandrel controls the tension constantly, the first term Since the generated torque of the mandrel is controlled so as to balance with the second term, the left equation becomes zero.

 However, in the unsteady state at the moment when the wrapper roll comes into contact with the strip, the left equation becomes negative and a negative angular velocity occurs, that is, the mandrel decelerates. In this case, the tension applied to the strip decreases, and the strip loosens between the wrapper roll and the pinch roll. This looseness results in winding failure such as loose winding of the outer coil and telescope.

 Therefore, in the present embodiment, stable strip winding in continuous hot rolling is realized. Although this embodiment is applicable to the first and second embodiments, a case where the present invention is applied to the second embodiment will be described as an example. Therefore, the same parts as those in the second embodiment are denoted by the same reference numerals with reference to FIG. 4, and the description thereof will be omitted.

In this embodiment, for example, a strip is cut with a strip shear 5. Then, the rotation control of the motor 132 of the mandrel 2 at the winding end position is switched from the torque control to the rotation speed control. Specifically, the operation may be switched to the rotation speed control at the timing of operating the strip shear 5, or when the strip is cut by the shear 5 while the torque control of the mandrel 2 is being performed, Since the tension applied to the strip is released and the rotation speed of the mandrel increases, an upper limit value is set for the rotation speed, and the speed control is automatically performed when the actual rotation speed reaches the above value. May be switched to.

 The wrapper roll 19 is equally spaced along the outer circumference of the coil, and is installed so that it can advance and retreat with respect to the mandrel 2 via a hydraulic cylinder equipped with a hydraulic pump and a servo valve (both not shown). In addition, it can be rotationally driven by a driving source (not shown). In this embodiment, at the time of the cutting, the mandrel 2 is switched to the rotation speed control, and then the wrapper roll 19 is brought into contact with the outer peripheral surface of the coil to control the coil. The wrapper roll 19 also functions as a guide for the strip when the mandrel 2 starts winding the strip. Alternatively, the relative position of the wrapper mouth 19 with respect to the coil may be grasped by a position detector (not shown), and the coil may be contacted with high accuracy.

 Next, the torque control of the mandrel 2 of the coiler is continued as before until the winding of the strip is completed, and the torque control of the mandrel 2 is performed immediately before the winding is completed, in accordance with the cutting of the strip. The actual change of the rotation speed (plate speed: mpm) and torque of the mandrel 2 were measured before and after switching to the control.

The results are shown in Fig. 9 when the torque control is continued and Fig. 10 when the speed is switched to the rotational speed. That is, in FIG. The reduction of the mandrel rotation speed when the parlor 19 comes into contact with the coil is clearly shown, but as shown in Fig. 10, when switching from strip cutting to speed control, the mandrel It can be seen that there is no decrease in the rotation speed and no loosening of the coil occurs.

 Here, it is preferable that the rotation speed of the mandrel 2 be faster than the moving speed of the preceding strip S ,. This is because when the mandrel 2 is switched from torque control to rotational speed control, the target of the speed control value is set somewhat faster than the actual speed at that time, so that the mandrel 2 pulls the strip. Because you can do it.

 In addition, by setting the timing of the contact of the wrapper 19 with the coil 19 between the time the strip is cut and the time the strip passes through the winding pinch roll 17, the mandrel 2 Can make the wrapper roll 19 contact the coil during the speed control, and the wrapper roll 19 can quickly start the braking operation of the rotation of the coil.

 Next, another embodiment will be described.

 As described above, before the strip is cut by the strip shear 5, the mandrel 2 is torque-controlled so that the strip wound around the mandrel 2 is pulled at a predetermined winding tension. Winding up. Thereafter, the strip is cut by the stripper_5. Here, the torque control of the mandrel 2 is continued even after the cut. After the cutting, the winding is continued with the strip being tensioned by the pinch rolls 17 and the mandrel 2.

Next, when the wrapper roll 19 is brought into contact with the coil, if the same tension is applied to the strip and the mandrel is wound up with 2 torques, the wrapper roll 1 At the moment when 9 is brought into contact with the coil, the rotation speed of the mandrel 2 is reduced and the tension is reduced. As a result, winding looseness occurs. Therefore, when the wrapper roll 19 is brought into contact with the outer peripheral surface of the coil, the set value of the tension is changed to a value higher than the previously set value. In the above equation (21), the strip tension is reduced by 4 F by bringing the four wrapper rolls 19 into contact with the outer peripheral surface of the coil, so the wrapper roll 19 is brought into contact with the coil. At this time, the tension set value should be increased by 4 F or more. Next, a strip winding method according to a fifth embodiment of the present invention will be described with reference to FIGS. Although this embodiment is applicable to the first and second embodiments, here, instead of the pressing force setting by the compensating pressing force setting device 124 of the first embodiment, the present embodiment is applied. The case where the embodiment is applied is taken as an example. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals with reference to FIG. 1 and the description thereof is omitted.

If the pressing force of the strip by the upper pinch roll 105 b is not appropriate when the offset angle of the pinch roll 105 for upstream winding is changed, the downstream winding device for thin strips 104 The tail end of the preceding strip S i cannot be sufficiently clamped by the upstream winding pinch roll 105, so that the tail end of the preceding strip S i is wound upstream. There is a danger that the tail strip may be cut off by hitting the triangular gate 1 2 8 when passing through the strip 5, and in the case of a thick strip, the following strip S ₂ is taken up by the upstream winding device 10. In some cases, normal induction to 1 cannot be performed.

In addition, after cutting, the preceding scan Bok after lip was only disconnect the pinch roll 1 0 5 for the winding, trailing strip S ₂ is time is relatively long string between Komu seen嚙to pinch roll 1 0 5 for卷取When winding up the pinch roll, the pressing force of the winding pinch roll 105 is under pressure control and the pushing load becomes zero due to the removal of the leading strip, so the gear gap of the winding pinch roll 105 closes. And there is a danger that the following strip S ₂ will be defectively inserted. Therefore, in this embodiment, the winding pinch roll on the stripper exit side is designed to prevent the tail end of the strip from being torn and to optimize the bending direction of the following strip. Set the appropriate pushing force of. Also, make sure that the leading end of the following strip does not get stuck in the winding pinch roll and cause a failure.

 The details are described below.

 FIG. 14 shows a state in which the lower pinch roll 105a is retracted upstream by an offset amount with respect to the upper pinch opening 105b. FIG. 15 shows a state in which the lower pinch roll 105a is offset, and then the upper pinch roll 105b is pressed down with the pressing force P.

 The product P · Αχ of the pressing force P of the pinch roll 105 and the vertical displacement Δχ of the pinch opening 105 generated by the pressing force P is the amount of work due to the pressing force Ρ.

 Also, assuming that the pressing force applied by the upper pinch roll 105 b when the upper pinch roll 105 b is at the X position is P (X), the upper pinch roll 105 b is moved to the x = 0 position. The work when pushing down from か ら to Δχ is expressed by the following equation (22).

Δ X

 Ρ (X) d X (2 2)

On the other hand, when the upper pinch roll 105 b pushes down the strip by △ X, the strip is displaced in the direction of applying tension, as shown in FIG. Then, the work required to displace the tension F by Δι is F · Διι. Also, in order to press the strip with the upper pinch roll 105 b to the state shown in FIG. 15, at the entrance side of the pinch roll 105, slide along the outer peripheral surface of the lower pinch roll 105 a. Bending deformation is applied to the trip. At the exit side of the pinch roll 105, bending-back deformation corresponding to the bending deformation along the lower pinch roll 105a and the opening of the upper pinch roll 105 are performed. A bending deformation corresponding to the bending deformation along the outer peripheral surface of 5b will be applied.

String tool bending work of when caused to bend the bending length 1 by radius of curvature R bend mode one instrument M _B generated in the flop of being expressed in · M _B (1 / R), the lower pinch roll 1 The radii of the upper pinch roll 105 a and the upper pinch roll 105 b are R _L and Ru, respectively, and the length of the portion of the strip wrapped around the lower pinch roll 105 a along the roll, strips When the length of each 1 _a, 1 _b along the roll on the winding portion of the pinch roll 1 0 5 b of flops, the inlet side of the pinch opening Ichiru 1 0 5, the lower pinch roll 1 0 5 a The work required to perform bending deformation on the strip along the outer peripheral surface is expressed as M _B · (1a / RL), and along the lower pinch roll 105a at the exit side of the pinch roll 105. Bending deformation corresponding to the bending deformation, bending deformation in a strip along the outer peripheral surface of the upper pinch roll 105b, and upper pinch roll 10 The work required to perform the bending back deformation corresponding to the bending deformation along the outer peripheral surface of 5b is MB MB (1a / RL), MB · ( _1b / Ru), MB · (1b / Ru ).

Therefore, the total amount of work required to bend 'unbending deformation takes place at the inlet side and outlet side of the pinch roll 1 0 5, 2 MB - a _{{(/ RL) (1 b} / Ru)}.

From the amount of work required for the upper pinch roll 1 05b to move from the x = = 0 position to the X = mm X position, the amount of work required to displace the strip by Δ u in the direction of tension F The subtracted value causes the strip to bend and unbend Therefore, the following equation (2 3) holds

Δ X X P (x)-d x -F-Δ υ

 0

= 2 MB {(la / R L) + (1 b / Ru)} ··· (2 3) where, M _B can be represented by the following formula (2 4).

_{M B = (1 Z 6)} σ Β · t 2 · w ··· (2 4)

Here, the yield stress of the strip is σ B, the thickness of the strip is t, and the width of the strip is w.

 The present inventors, when the upper pinch roll 105b is in contact with the strip, is further depressed, and as the strip is elastically deformed, the upper pinch roll 1b is pressed down. It was confirmed that the load required to push down 0 5b increased linearly. Fig. 11 shows the relationship between the pushing force of the upper pinch roll and the amount of downward displacement of the upper pinch roll. In this relationship, the inclination is determined according to the size of the pinch roll, the material and dimensions of the strip, and the like. Therefore, let P (X) be P (0) = 0, P (Δχ) = Ρ. Assuming that the temporary function is

Ρ (X) = Ρ. · Since it is expressed as χ / Δχ, equation (2 3) is expressed by the following equation (2 5). From equations (2 5) and (2 4), the following equation (2 6) holds P Δ x— F · Δ u

2 Au

Po = F + ten σ B w

 (26) However,

 P 0: Pinch roll pressing force

 F: Strip tension

 Δ u: Strip displacement caused by tension F

Δ X: Vertical displacement of pinch roll caused by pressing force P

MB: string-up to produce bending moment _{= (1/6) σ Β - tw} σ Β: strips yield stress of

 t: Strip thickness

w: width of the strip

 1: The length along the roll where the strip wraps around the lower pinch roll

 RL Pinch roll radius

1 _b string tool length along the roll of wrapping portion on top pinch roll flop

 Ru: radius of upper pinch roll

The displacement Δχ and Au can be calculated geometrically, and the strip yield stress σ _で is a value determined according to the material, and the strip thickness t The width W is determined by the processing material. Therefore, the rotation speed of the winding device and the pinch opening

The most appropriate pressing force P can be calculated by determining the strip tension F from the rotation speed of the tool. In this embodiment, the pushing force of the winding pinch nozzle is determined by the above equation (26). The value was set to a value or more.

 Fig. 12 and Fig. 13 show the actual force chart and the chart of the oil injection command for the slicing that pushes down the pinch roll.Fig. 12 shows the case where the pressing force is not set in this embodiment. FIG. 13 shows an example of the present embodiment. The pressing force suddenly drops to a quality load state when the preceding strip comes off the pinch roll, and when it drops, as shown in Fig. 12, the cylinder oil injection command changes the direction to maintain the pressing force. To operate the pinch roll in the tightening direction. Therefore, there is a possibility that the subsequent strip will be defectively inserted. Even if there is no misfeeding, if the trailing strip enters the pinch roll, the pressing force rises rapidly and then recovers to the set value, and the cylinder oil injection command activates the pinch roll in the opening direction. Hunting as an overaction.

 On the other hand, Fig. 13 shows that the pinch roll cap is held constant until the leading strip comes off the pinch roll after the pressing force is set and the following strip enters the pinch roll. The one-point valve is closed and the oil injection is held, so the cylinder oil injection command remains constant. Therefore, there is no occurrence of a failure in the following strip. Industrial applicability

As is apparent from the above description, according to the present invention, it is possible to prevent the preceding strip from being loose on the exit side of the winding pinch opening and to prevent the leading end of the following material from being wound. An effect is obtained in which it is possible to prevent looseness on the entrance side of the pinch roll. Further, when the present invention is applied to a hot rolling line equipped with a carousel-type winding device, the tail end of the strip wound on the mandrel via a winding pinch roll is set to the above-mentioned position. and setting the winding speed V _m of the mandrel after cutting with scan Bokuri Ppushiya, and the target speed V _P of the pinch rolls preparative said winding during said cutting, a plate velocity V _S of the next strip after just the cutting V m> V _P > V _s , the leading strip at the branching point between the pass line heading to the mandrel at the winding start position and the pass line heading to the mandrel at the winding end position This has the effect of preventing the guide from being caught on the tip.

Further, when the present invention is applied to a general hot rolling line, a strip wound around the downstream mandrel via a second winding pinch roll disposed on the entrance side of the downstream mandrel. target speed of said second first winding pinch roll preparative disposed to the target speed V _P scan Bok Li Ppusha one exit side of the winding pinch rolls preparative when the tail end of the flop was cut with the string Ppusha one V _{p 2,} by the relationship set winding speed V _m of the target plate velocity V _s and the downstream mandrel row material after just the cutting and _{V m> V pl> V p} 2> V s

However, there is an effect that the strip can be prevented from being damaged due to the tail end of the preceding strip catching on the triangular gate.

In this case, after offsetting the lower pinch roll of the first winding pinch roll, the tail end of the strip wound on the downstream mandrel via the second winding pinch roll is strip sheared. In the state where the speed of the lower pinch roll is lower than the target plate speed V _s of the succeeding material before cutting by the lower pinch roll, the torque of the lower pinch roll is reduced by the upper pinch roll of the first winding pinch roll. Press the strip until the actual value reaches a predetermined set value, and set the pressing force at this time to the set pressing force of the upper pinch roll against the strip when offsetting Is stored on the downstream mandrel. Since the tail end of the rip can be satisfactorily sandwiched by the first winding pinch roll, the slip between the strip tail end and the upstream winding pinch roll can be reliably eliminated. The effect is obtained

Prior to continuously winding the strip cut by the strip shear by the mandrel through the winding pinch roll disposed on the exit side of the strip shear, the press was force of the pinch rolls preparative take-P = F (a u / Δ X) ten _{2 (M B / Δ Χ)} {( tooth _{/ r) + (1 b /} R)} over P values determined by By setting, the pressing force of the upper pinch roll can be set to the most appropriate value, so that the tail end of thin strips or poor guiding of the thick strip to the winding device can be prevented. This has the effect of preventing it.

 In this case, after the pressing force is set, the gap of the winding pinch roll is maintained from the stripping of the preceding strip to the insertion of the succeeding strip, so that the following strip can be removed. An effect is obtained in that it is possible to prevent poor penetration into the winding pinch roll and the like.

Further, before the winding of the strip by the mandrel is completed, the winding control of the strip by the mandrel is switched from the torque control to the rotation speed control. Hold down the mandrel against the lip to stop the rotation of the mandrel, or increase the tension of the strip before finishing the winding of the strip by the mandrel. By controlling the torque of the strip by the press, the pressing roll is pressed against the strip which is then wound into a coil, and the rotation of the mandrel is stopped. Deceleration can be prevented, and winding defects such as loose winding of the outer coil and telescoping can be avoided. Presser mouth when stopping the rotation of the I Le - lifting Le is the braking force Therefore, the effect that the rotation of the coil can be stopped in a short time can be obtained.

 Further, after the strip is cut by the strip shear, when the leading end of the following material is inserted into the winding pinch opening arranged on the exit side of the strip shear, the winding is performed. By setting the torque limit on the decelerating side of the drive device for the winding pinch roll so that the peripheral speed of the pinch roll for winding is faster than the conveying speed of the following material, bending at a large plate thickness is possible. Even in the case of a strip having high rigidity, an effect is obtained in which the trailing material can be prevented from loosening on the entrance side of the winding pinch roll.

Claims

The scope of the claims

1. The strip sent from the rolling mill is cut into a predetermined length by a strip shear, and the cut strip is removed by a winding pinch roll arranged on the exit side of the strip shear. The strip is wound by a mandrel of a winding device via a

 The peripheral speed of the winding pinch roll after cutting the tail end of the strip wound on the mandrel via the winding pinch roll with the strip shear is immediately after the cutting. A strip winding speed which is higher than the transport speed of the following material and lower than the strip winding speed of the mandrel.

2. The mandrel is a mandrel of a force-roiling reel type winding device, and a tail end of a strip wound on the mandrel via the winding pinch roll is cut by the strip shear. and the set winding speed V _m of the mandrel after, the and the target speed V p of said卷取pinch rolls during cutting, relationship V _m between the plate velocity V _s of the next strip after just the cutting> 2. The method for winding a strip according to claim 1, wherein V _P > V _s .

 3. The strip sent from the rolling mill is cut to a predetermined length by the strip shear, and the cut strip is placed on the exit side of the strip shear. In a strip winding method in which the mandrel of the upstream winding device and the mandrel of the downstream winding device are alternately wound via the winding pinch roll of (1),

After the tail end of the strip wound around the downstream mandrel via the second winding pinch roll arranged on the entrance side of the downstream mandrel, the strip end is cut by the strip shear. Target speed V of the first winding pinch roll The relationship between the target speed V _{P2 of} the first winding pinch roll, the target plate speed V _s of the succeeding material immediately after the cutting, and the set winding speed V _m of the downstream mandrel is represented by V _m > V _Pl > V. _A method for winding a strip, wherein _PZ > Vs.

4. After offsetting the lower pinch opening of the first winding pinch roll, the tail end of the strip wound on the downstream mandrel via the second winding pinch roll. said until cutting with scan Bokuri Ppushiya, the first of said first winding pinch rolls preparative speed lower pinch port Ichiru while slower than the target plate velocity V _s of the trailing member The strip is pressed by the upper pinch roll until the actual torque value of the first lower pinch roll reaches a predetermined set value, and the upper force when the pressing force at this time is offset is set. 4. The strip winding method according to claim 3, wherein a set pressing force is applied to the strip with a pinch roll.

5. Prior to continuously winding the strip cut by the strip shear by the mandrel through the winding pinch roll disposed on the exit side of the strip shear, 4. The strip winding method according to claim 1, wherein the pressing force of the winding pinch roll is set to a P value or more determined by the following equation. .

P = 2F (Au / Δχ) +4 (Μ _Β / ΔΧ) {(l _a / R _L ) + (l _b / Ru)} where

 P: Pinch roll pressing force

F: Strip tension

 Δ u: Strip displacement caused by tension F

Δ X: Vertical displacement of pinch roll caused by pressing force P

MB: bending moment generated in the strip = (1/6) σ _Β · t ² · w σ _Β : yield stress of the strip t: thickness of the strip

w: Strip

1 _a : Length along the roll where the strip wraps around the lower pinch roll

R _L : radius of lower pinch roll

l _b: top length along the roll of wrapping portion of the pinch rolls of strips

 R u: radius of upper pinch roll

 6. The method according to claim 5, wherein after the setting of the pressing force, the gap of the winding pinch roll is held from the removal of the preceding strip to the insertion of the following strip. How to wind the strip.

 7. The speed ratio in the accelerating process between the mandrel and the winding pinch roll is set in relation to the final speed ratio between the mandrel and the winding pinch roll. 3. The method for winding a strip according to claim 1 or 2.

 8. Before the winding of the strip by the mandrel is completed, the winding control of the strip by the mandrel is switched from the torque control to the rotation speed control, and then the strip is wound into a coil. The method for winding a strip according to any one of claims 1 to 7, wherein a rotation of the mandrel is stopped by pressing a holding roll.

9. Before the winding of the strip by the mandrel is completed, the torque of the strip is controlled by the mandrel so as to increase the tension of the strip, and then the strip is wound into a coil. The method for winding a strip according to any one of claims 1 to 7, wherein a rotation of the mandrel is stopped by pressing a holding roll.

10. After the strip is cut by the strip shear, the following material is cut. When the leading end is inserted into the winding pinch roll disposed on the exit side of the strip shear, the peripheral speed of the winding pinch roll is set to be higher than the transport speed of the following material. The strip winding according to any one of claims 1 to 9, wherein a torque limit on a deceleration side of the driving device for the winding pinch roll is set. Method.

 11. The speed ratio in the acceleration process between the downstream winding device and the second winding pinch roll is determined by the target between the downstream winding device and the second winding pinch roll. The speed ratio in the process of accelerating the second winding pinch roll and the first winding pinch roll is set in relation to the speed ratio. 4. The strip winding method according to claim 3, wherein the setting is made in relation to a target speed ratio between the roll and the first winding pinch roll.