JP2012161832A - Steel plate levelling speed control method on levelling machine and its equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel plate levelling speed control method on a levelling machine and its equipment, which can improve manufacturing efficiency of the steel plate by avoiding collision of the tail end of a preceding steel piece with the head end of a following steel piece, and can eventually improve productivity.SOLUTION: When a plurality of steel plates cooled to a designated temperature on a cooling bed 1 are successively straightened through a levelling machine 2 and when a steel plate on a transfer table on the entry side of the levelling machine is drawn in beneath the work roll of levelling machine 2 for straightening with no steel plate in the levelling machine, if the space Lb on the delivery side of the levelling machine is longer than the length of steel plate that is assumed to be drawn in and straightened, straightening on the levelling machine 2 is performed at the predetermined standard speed for straightening, and if the space Lb on the delivery side of the levelling machine is shorter than the length of steel plate that is assumed to be drawn in and straightened, straightening on the levelling machine 2 is performed at a slower speed than the standard speed for straightening, and furthermore, the shorter is the space Lb on the delivery side of the levelling machine, the slower is the straightening speed.

Description

  The present invention relates to a steel plate straightening speed control method and apparatus using a straightening machine.

  In the manufacturing process of a steel plate, for example, a thick steel plate (thick plate), after rolling, it is conveyed by a plurality of conveyance tables to the shearing machine through the cooling bed and the straightening machine. The cooling floor temporarily stores the thick steel plate and air-cools it to a predetermined temperature, and also performs a buffer function in the processes from rolling to shearing. Next, the thick steel plate sent out from the cooling floor is corrected for ear waves, medium waves, etc. by a straightening machine. This straightening machine is installed downstream of the cooling bed in the transport direction.

  As a straightening machine installed on-line, the work roll is supported by divided reinforcing rolls divided into three or more in the roll axis direction, and each divided reinforcing roll has an independent load detection device and divided reinforcing roll reduction device. Each corrector is known. This straightening machine can detect and control the plate shape with high accuracy without time delay, and can correct the shape of the steel plate with high accuracy (for example, Patent Document 1, column 5, lines 22 to 30). In the same column, lines 47 to 49 and FIG. 6 (b)).

  Driving the corrector to avoid collision between the tail end of the preceding steel plate (hereinafter also referred to as “preceding material”) and the front end of the steel plate following the preceding material (hereinafter also referred to as “following material”) on the transfer table. -Stop and correct speed must be controlled (correction pitch control). In the correction pitch control, a space longer than the length of the succeeding material to be corrected next is required on the rear surface (exit side) of the correction machine. For this reason, since it is necessary to wait for the correction of the succeeding material until the rear space of the straightening machine becomes longer than the length of the succeeding material, the productivity may be hindered.

  As a technique related to the above problem, there is a technique for controlling a rolling interval time between a preceding material and a succeeding material in a continuous rolling facility. That is, when the steel plate being rolled is tracked and the preceding steel plate being finish-rolled decelerates, the distance between the tail end of the preceding steel plate being rough rolled and the tip of the subsequent steel plate being rough rolled is obtained, When the interval becomes narrower than the set value, the rough rolling speed of the succeeding steel plate is reduced to avoid collision between both steel plates. Furthermore, when the preceding steel plate that has been finish-rolled stops, after continuing the rough rolling of the subsequent steel plate until the interval between the two steel plates reaches a set value, stop, and release the reduction of the rough rolling mill, It is possible to avoid collision between both steel plates and to prevent pulling and pushing (for example, see Patent Document 2, page 3, upper right column, line 8 to page 5, upper left column, line 5 and FIG. 1).

JP 2003-181504 A JP-A-3-13230

  However, the technique of the above cited reference 2 is a measure when a trouble that prevents rolling for some reason during rolling of the preceding material occurs and the movement of the preceding material is stopped. Therefore, the technology cannot be applied while the preceding material and the succeeding material continue to move on the line, and the production efficiency cannot be improved based on the technology.

  Therefore, the present invention is a steel plate straightening speed control method with a straightening machine that can increase the production efficiency of the steel plate without increasing the collision between the tail end of the preceding material and the tip of the following material, and can increase productivity, and It is an object to provide such a device.

In order to solve the above problems, the present invention is configured as follows.
(1) In the steel sheet straightening speed control method using the straightening machine according to the first aspect of the invention, a plurality of steel sheets cooled to a predetermined temperature on the cooling floor are continuously straightened by the straightening machine. When there is no steel sheet in the straightening machine, the straightening machine outlet side space is longer than the length after the straightening of the drawn steel sheet when the steel sheet on the conveying table on the straightening machine is drawn directly under the work roll of the straightening machine. In this case, the correction speed of the correction machine is corrected at a preset correction reference speed. When the straightening machine outlet side space is shorter than the length after correction of the drawn steel sheet, the correction is performed at a lower speed than the correction reference speed and as the straightening machine outlet side space is shorter.
(2) The steel sheet straightening speed control method with the straightening machine of the second invention is the first invention, wherein the distance Le between the center of the straightening machine and the tail end of the preceding material is obtained, and the distance Le is the distance Le> correction predicted length. In the case of the length Lx + margin, the correction speed is set to a preset correction reference speed.
When the above conditions are not satisfied, the correction is performed at a speed set in advance at a lower speed as the calculated distance Lb is lower than the correction reference speed.
(3) A steel plate straightening speed control device in the straightening machine of the third invention comprises a control device for the straightening machine and a transport table control device for transporting the steel plate cooled by the cooling floor to the straightening machine,
The correction machine control device, a correction speed storage unit that stores a correction reference speed,
A Le calculating unit that calculates a distance Le between the center position of the straightening machine and the leading end of the leading material from the leading end position of the leading material;
An Lb calculation unit for calculating a distance Lb between the leading edge of the succeeding material and the leading edge of the leading material being corrected from the leading edge position of the leading material and the trailing edge position;
An Lb reference setting unit for setting a plurality of reference values of the distance Lb;
The straightening speed of the straightening machine is determined based on the straightening speed, Le, Lb, and Lb reference values, and the straightening speed decision value is output to the straightening speed control unit and the conveyance table control device in the straightening machine. A determination unit,
The control device for the transport table controls the steel plate transport speed of the transport table based on the correction speed from the correction speed determination unit.
(4) The steel plate straightening speed control device in the straightening machine of the fourth invention is a steel plate straightening speed control device in the straightening machine of the third invention, wherein the straightening machine control device further calculates the calculated distance Le. When distance Le> correction predicted length Lx + room, the correction speed is set to a preset correction reference speed.
If the above condition is not satisfied, the correction speed is set to a lower speed as the correction speed is lower than the correction reference speed and the calculated distance Lb is shorter.

  In the present invention, when there is no steel plate in the straightening machine, when the steel sheet on the conveyance table on the straightening machine inlet side is drawn and straightened under the work roll of the straightening machine, the straightening machine outlet side space is the post-correction of the drawn steel sheet. When the length is longer than the length, the correction speed of the straightening machine is corrected at a preset correction reference speed, and when the outlet side of the straightening machine is shorter than the length after correction of the drawn steel sheet, the correction reference speed is corrected. The lower the speed and the shorter the straightening machine exit space, the faster the correction pitch can be shortened without collision between the tail end of the preceding material and the tip of the following material in order to correct at a lower speed. This makes it possible to increase the manufacturing efficiency of the steel sheet and increase the productivity.

It is a top view which shows typically the steel plate correction equipment in which the correction pitch control of this invention is implemented. It is a block diagram of the straightening machine control apparatus of this invention. It is a graph which shows the example of correction standard speed. It is a flowchart of the correction speed determination part of the correction machine shown in FIG.

  As shown in FIG. 1, the steel plate straightening equipment, which is a subsequent process of the cooling bed 1, includes a plurality of transfer tables 3 to 8, a straightening machine 2, a straightening machine control device 40, and a transfer table control device 51. The conveyance tables 3-8 are arrange | positioned along the conveyance line of a steel plate, and are a roller table type | mold which consists of a some roller (not shown). The lengths of the transfer tables 3 to 8 are all 17 m, for example.

  The conveyance tables 3 to 8 are independently driven for each conveyance table by drive motors 9 to 13. Rotational speed detectors 14 to 18 are attached to the drive motors 9 to 13, respectively. The conveyance speed of the steel plate is detected by the number of rotations of the drive motors 9 to 13. The transport table control device 51 controls the drive motors 9 to 13 to control the drive / stop and speed of the transport tables 3 to 8. Steel plate detectors 19 to 23 are arranged near the rear ends of the transfer tables 3 to 8, respectively. The steel plate detectors 19 to 23 detect the tips of the steel plates that have entered the transfer tables 3 to 8.

  The cooling floor 1 is installed adjacent to the upstream side of the transfer table 3 along the transfer line. The cooling floor 1 takes in a steel plate that has been transported from a rolling facility by a transport table (both not shown), and in order to take out the steel plate to the transport table 3, each of the intake side and the discharge side of the cooling floor 1 Is provided with a transfer device (not shown). The steel sheet taken into the cooling floor 1 is air-cooled while being gradually conveyed to a predetermined temperature (for example, 200 to 100 ° C.).

  The straightening machine 2 is arranged on the downstream side of the cooling bed 1 in the transport direction. The straightening machine 2 is the aforementioned split reinforcing roll type straightening machine.

  A measuring roll 24 is provided on the exit side of the straightening machine 2. The measuring roll 24 is in contact with the surface of the steel plate (steel plate being straightened) coming out of the straightening machine 2 and measures the length of the steel plate coming out of the straightening machine 2, that is, the straightened steel plate length.

  The host computer 41 of the straightening machine control device 40 includes the straightening speed information shown in FIG. 2, the length information of the steel plate before straightening (on the straightening machine input side), and the reduction rate for straightening the steel plate with the straightening machine 2 (for example, , About 2 to 5%).

  The correction speed information is a plurality of correction speed patterns, and the correction speed patterns are output to a correction speed determination unit 49 described later. The pattern of the correction speed and the number of memories thereof are determined in advance according to the operation results of the steel plate rolling. Further, the number of pattern memories is about 2 to 4.

  FIG. 3 shows an example of the correction speed pattern and shows a trapezoidal correction reference speed. This straightening reference speed includes starting of the straightening machine 2, increasing at a constant acceleration, constant speed (120 mpm), decelerating at a constant deceleration, and stopping. Further, the other correction speed patterns, that is, the speeds 30 mpm and 10 mpm shown in FIG. 4 are 30 mpm and 10 mpm.

  Next, the correction machine control device 40 will be described with reference to FIG.

  The straightening machine control device 40 includes a straightening machine center position setting unit 44, a Le calculation unit 45, a correction actual length calculation unit 46, a Lb calculation unit 47, a Lb reference setting unit 48, a correction speed determination unit 49, and a correction predicted length. The calculation unit 42 and the tracking unit 43 are included, and a series of operations to be described later is instructed to the correction speed control unit 50 and the conveyance table control device 51.

  In addition, the tracking unit 43 calculates the steel plate position based on the measured values from the rotation speed detectors 15 to 18 and the steel plate detectors 19 to 23 and the elapsed time since the front end of the steel plate is detected. The tail end position, the leading end position of the following material B (see FIG. 1), etc. are obtained.

  The straightening machine center position setting unit 44 sets the center position 0 on the conveyance line of the straightening machine 2. The center position 0 of the straightening machine 2 is the position where the upper and lower work rolls WR of the straightening machine come into contact, that is, the center of the work roll WR in the radial direction (steel sheet conveying direction). The tail position of the leading material A and the leading edge position of the succeeding material B (see FIG. 1) of the steel plate on the transport table are based on the center position 0 of the straightening machine 2 as a reference point.

  The corrected predicted length calculation unit 42 inputs the length Lo information and the reduction ratio β information before correction of the succeeding material B to be corrected this time by the correction machine 2 from the host computer 41, and the post-correction post-correction input in advance. Substituting the input length Lo of the succeeding material B before correction and the rolling reduction ratio β into the expression “Lx = Lo × {1 + β / (1−β)}” for obtaining the length Lx, the predicted length after correction The length Lx is calculated. The predicted length Lx after correction of the succeeding material B calculated here is output to the correction speed determination unit 49.

  The tracking unit 43 includes the number of rotations from the number-of-rotations detectors 14 to 18 provided in each of the transfer tables 3 to 8 and time information detected by the steel plate detectors 19 to 23 provided to the transfer tables 3 to 8 ( The leading material A tail end position is obtained based on the elapsed time since the steel plate tip was detected.

  Based on the tail end position of the preceding material A obtained by the tracking unit 43 and the straightening machine center position 0 from the straightening machine center position setting unit 44, the Le calculation unit 45 calculates the corrector center and the leading material A tail end. The distance Le is obtained. The distance Le obtained here is output to the correction speed determination unit 49.

  The correction actual length calculation unit 46 inputs the measurement value with the measuring roll 24 provided on the exit side of the correction machine 2 and the steel sheet actual length output from the correction machine 2 (hereinafter referred to as the steel plate correction length). Lc is obtained. The obtained steel plate correction actual length Lc is output to the Lb calculation unit 47. The steel plate actual length Lc output from the straightening machine 2 output to the Lb calculating unit 47 is preferably a value obtained by adding the distance between the measuring roll 24 and the straightening machine center position O.

  The Lb calculation unit 47 calculates the difference between the distance Le between the center of the straightening machine from the Le calculation unit 45 and the tail end of the preceding material A and the corrected steel plate length Lc of the following material B from the correction actual length calculation unit 46 ( Le−Lc), the distance (exit space) Lb between the tail end of the preceding material A and the tip of the succeeding material B during correction is obtained. The obtained distance Lb is output to the correction speed determination unit 49 of the correction machine.

  The Lb reference setting unit 48 is set with a plurality of Lb reference values. It is determined by the length of one transfer table 5 to 8 constituting the transfer line. Thereby, the margin between the tail end of the preceding material A and the tip of the succeeding material B can be made as small as possible. The set number of Lb reference values is about 2 to 4. The length of the Lb reference value is, for example, 3 m, 18 m, or 35 m when the length of the transfer table is 17 m and the set number is 3, for example.

  The correction speed determination unit 49 corrects the correction speed pattern from the host computer 41, the distance Le from the Le calculation unit 45, the distance Lb from the Lb calculation unit 47, and the subsequent steel plate B from the correction predicted length calculation unit 42. The correction speed of the straightening machine 2 is determined on the basis of the predicted length Lx and the Lb reference value from the Lb reference setting unit 48, and the correction speed signal is sent to the correction speed control unit 50 and the conveyance table control device 51 of the correction machine 2. Output. A plurality of Lb reference values are set in accordance with the exit space and the number of empty transport tables 5 to 8 on the exit side of the straightening machine. The correction speed determination unit 49 performs calculation of correction speed determination of the correction machine 2 in one cycle, for example, 30 ms.

  Based on the correction speed signal input from the correction speed determination unit 49, the correction speed control unit 50 outputs an instruction signal for driving / stopping the correction machine 2 and the correction speed to the correction machine 2. Moreover, the conveyance table control apparatus 51 is based on the signal from the correction speed determination part 49 of a correction machine, and the table drive motors 10-13 of the conveyance tables 5-8 on which the succeeding material B is mounted (in the case of FIG. 1). Driving / stopping and conveying speed instruction signals are output to the table driving motor 10) of the conveying table 5.

  The conveyance tables 3 to 8 are started, accelerated, corrected reference speed, decelerated, or stopped according to a control signal from the conveyance table control device 51.

  Here, with reference to FIGS. 1-4, the correction speed control method by the apparatus comprised as mentioned above is demonstrated.

  When there is no steel plate in the straightening machine 2, the carry-over table 3 (and / or 9) and the straightening machine 2 are driven for the subsequent material waiting on the straightening machine entrance-side transport table 3 (and / or 4), The straightening machine 2 is pulled directly under the work roll WR. The distance Le between the center of the straightening machine and the leading material tail, that is, the relationship between the straightening machine outlet side space and the predicted length Lx after the following material is straightened is expressed as (the straightening machine center and the leading material tail edge If the distance Le)> (predicted correction length Lx of the succeeding material B) is satisfied, correction is started, and correction is continued during correction, and the correction speed is preset. The correction straight speed is used.

  If the above condition is not satisfied, the correction speed is determined by comparing the exit side space Lb (Le-corrected length Lc) with a plurality of preset Lb reference values. Then, the calculation of Le and Lb and the operation in the two cases are defined as one cycle, and the cycle is repeated in 30 ms.

  Specifically, the correction speed of the straightening machine 2 is controlled such that the distance Le between the center position O of the straightening machine 2 and the tail end position of the preceding material A is the predicted straight length Lx of the succeeding material B to be corrected (preferably When the margin L exceeds the length Lx (for example, a value obtained by adding 2 m), the correction of the succeeding material B is completed regardless of the distance Lb. Then, if the movement of the following material B is immediately stopped, there is no possibility that the leading end of the following material B collides with the tail end of the preceding material A. Therefore, the following material B is corrected to a reference speed (for example, 120 mpm). Carry in and correct. Further, when the correction of the following material B is started, the corrected length of the following material B is set to zero, and the correction is started so that the correction reference speed is reached when the above conditions are similarly exceeded.

  On the other hand, when the distance Le is equal to or less than the predicted correction length Lx of the succeeding material B (preferably a value obtained by adding the margin allowance α to this length), there is a risk of collision with the tail end of the preceding material A. Therefore, the distance Lb, which is the difference between the distance Le and the corrected length Lc of the succeeding material B, is obtained, and correction is continued at a slower speed (for example, 30 mpm, 10 mpm) as the distance Lb becomes smaller. In this case, the correction of the succeeding material B is started in the same manner as described above, but the speed is made slower as the distance Lb becomes smaller as described above.

  Further, when the distance Lb is equal to or less than a preset lower limit distance value (for example, 3 m), the correction speed is reduced to 0 because there is a high risk that the leading edge of the trailing material B collides with the tail edge of the preceding material A. (Correcting interruption) and wait. In this case, as a matter of course, if the correction of the trailing material B has not been started, the correction is not started and the apparatus waits in a state of being pulled directly under the work roll WR of the correction machine 2. When the distance Lb is equal to or greater than a preset lower limit distance value, when the distance Lb is equal to or less than the lower limit distance value, the driving of the work roll WR of the transport table 10 and the correction machine 2 is stopped immediately. Can be avoided, the correction speed is determined again based on the distance Lb, and the correction is restarted. If the correction of the succeeding material B is not started, the correction is started. The correction speed is controlled so as to correspond to the distance Lb as described above.

  Here, the correction speed determination method of the correction machine will be specifically described with reference to FIG. FIG. 4 is a flowchart showing the calculation contents in the correction speed determination unit 49 shown in FIG.

Step S1
Based on the leading material tail end position and the straightening machine center position O from the tracking unit 43, a distance Le between the straightening machine center O and the tailing end of the preceding material A is obtained. Next, the leading edge position of the trailing material B is obtained based on the corrected actual length Lc of the trailing material B measured by the measuring roll 36, and the distance between the leading edge of the trailing material and the leading edge of the preceding material (distance Le-following). The correction actual length Lc) Lb of the material is obtained.

Step S2
Based on the predicted correction length Lx after correction of the succeeding material B from the corrected predicted length calculating unit 42 and the calculated distance Le, the condition [distance Le> corrected predicted length Lx + α of the succeeding material] is set. Determine if you are satisfied. If this condition is met, the process proceeds to step S3, and if not, the process proceeds to step S11. Here, α is a margin (2 m) for the collision between the leading material tail end and the trailing material tip.

Step S3
The correction speed in the correction machine 2 is set to 120 mpm which is the correction reference speed.

Step S11
The condition [distance Lb: exit space (distance Le-corrected actual length Lc of the succeeding material B) <3 m] is determined based on the distance Lb which is the exit space calculated in step S1. If this condition is satisfied, the process proceeds to step S12. If not satisfied, the process proceeds to step S21.

Step S12
The straightening speed of the straightening machine 2 is set to 0, and the following material B is not straightened.

Step S21
The condition [distance Lb> 35 m] is determined. That is, it is determined whether or not the distance Lb exceeds 35 m (empty for about two transport tables). If this condition is met, the process proceeds to step S22, and if not, the process proceeds to step S31.

Step S22
The following material B is corrected by setting the correction speed of the correction machine 2 to 30 mpm.

Step S31
The condition [distance Lb <18 m] is determined. That is, it is determined whether or not the distance Lb exceeds 18 m (empty for about one transport table). If this condition is satisfied, the process proceeds to step S32. If not satisfied, the process proceeds to step S41.

Step S32
The following material B is corrected by setting the correction speed of the correction machine 2 to 10 mpm.

Step S41
The succeeding material B is corrected at the higher correction speed of the correction machine 2 which is the current speed or 10 mpm.

  In determining the distance (exit side space) Lb between the tail end of the preceding material A and the trailing material B being straightened, the straightening machine center O from the Le calculation unit 45 and the tail end of the preceding material A The distance Le and the correction actual length calculation unit 46 are obtained by subtraction (Le-Lc) of the correction actual length Lc of the succeeding material B. However, without limitation to this, in the correction actual length calculation unit 46, The leading end position of the following material B is tracked based on the measurement value of the measuring roll 24, and the distance (exit space) Lb is obtained from the tracking information and the tail end position of the preceding material A from the tracking unit 43. Anyway.

DESCRIPTION OF SYMBOLS 1 Cooling floor 2 Straightening machine WR Work roll of straightening machine 3-8 Conveyance table 9-13 Table drive motor 14-18 Rotational speed detector 19-23 Steel plate detector 24 Measuring roll 40 Straightening machine controller 41 Host computer 42 Straightening Predicted length calculation unit 43 Tracking unit 44 Straightener center position setting unit 45 Le calculation unit 46 Corrected actual length calculation unit 47 Lb calculation unit 48 Lb reference setting unit 49 Correction speed determination unit 50 Correction speed control unit 51 Transfer table control device
O Center of straightening machine A Preceding material B Subsequent material Le Distance between the center of straightening machine and leading edge of leading material Lb Distance between leading edge of trailing material and tailing of leading material

Claims (4)

  In the steel plate straightening speed control method of continuously correcting a plurality of steel plates cooled to a predetermined temperature on the cooling floor with a straightening machine, the steel sheet on the conveying table on the straightening machine entry side is removed from the straightening machine when there is no steel sheet in the straightening machine. When the straightening machine outlet side space is longer than the post-correction length of the steel sheet drawn in immediately under the work roll, the correction speed of the straightening machine is corrected at a preset correction reference speed, and the correction is performed. When the machine exit side space is shorter than the length after correction of the drawn steel sheet, it is slower than the correction reference speed, and the shorter the machine exit side space, the lower the speed is corrected. Steel sheet straightening speed control method with a straightening machine. The distance Le between the center of the straightening machine and the tail end of the preceding material is obtained, and when the distance Le> correction predicted length Lx + room, the correction speed is set as a preset correction reference speed,
2. The straightening machine according to claim 1, wherein when the above condition is not satisfied, correction is performed at a speed that is lower than the reference correction speed and that is set at a lower speed as the calculated distance Lb is shorter. Steel sheet straightening speed control method. A control device for a correction table and a control device for a transfer table for transferring a steel sheet cooled by a cooling bed to the correction device;
The straightening machine control device is
A correction speed storage unit for storing a correction reference speed;
A Le calculating unit that calculates a distance Le between the center position of the straightening machine and the leading end of the leading material from the leading end position of the leading material;
An Lb calculation unit for calculating a distance Lb between the leading edge of the succeeding material and the leading edge of the leading material being corrected from the leading edge position of the leading material and the trailing edge position;
An Lb reference setting unit for setting a plurality of reference values of the distance Lb;
The straightening speed of the straightening machine is determined based on the straightening speed, Le, Lb, and Lb reference values, and the straightening speed decision value is output to the straightening speed control unit and the conveyance table control device in the straightening machine. A determination unit,
The steel sheet correction speed control apparatus for a correction machine, wherein the transfer table control device controls a steel sheet transfer speed of the transfer table based on a correction speed from the correction speed determination unit. If the calculated distance Le is the distance Le> correction predicted length Lx + margin, the correction speed is set as a correction reference speed set in advance,
4. The straightening machine according to claim 3, wherein when the above condition is not satisfied, the correction speed is set to a lower correction speed in advance as the calculated distance Lb is lower than the correction reference speed. Steel plate straightening speed control device.

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