WO2007108356A1

WO2007108356A1 - Cold continuous rolling facility

Info

Publication number: WO2007108356A1
Application number: PCT/JP2007/054884
Authority: WO
Inventors: Yujiro Kobayashi; Takashi Suzuki; Yoichi Matsui; Yuji Kikuchi; Haruyuki Yabe
Original assignee: Mitsubishi-Hitachi Metals Machinery, Inc.
Priority date: 2006-03-17
Filing date: 2007-03-13
Publication date: 2007-09-27
Also published as: JP2007245215A; DE112007000641T5; DE112007000641B4; JP4878485B2; CN101405094B; CN101405094A

Abstract

A cold continuous rolling facility, comprising a tandem rolling machine (11) for joining a plurality of hot rolled coils, correcting distortion of the joined hot rolled coils through a tension leveler (7), removing surface scale by passing them through an acid pickling facility (8), and rolling them continuously by means of two or more rolling machines, is provided, as rolling machines, with one or more work roll shift mills (10) each having a movable up/down work roll which is provided, at the distal end thereof, with a tapered roll crown. Furthermore, an edge drop gauge (2a) is provided between the tension leveler (7) and a tension bridle roll (3) provided on the inlet side of the acid pickling facility (8).

Description

Specification

Cold continuous rolling equipment

Technical field

TECHNICAL FIELD [0001] The present invention relates to a cold continuous rolling facility for continuously rolling with a plurality of rolling mills in plate rolling.

Background art

[0002] Conventionally, it has been an important issue to improve so-called edge drop, in which the plate thickness is rapidly reduced in the vicinity of the end of the plate during plate rolling. In response to this problem, rolling is performed by a rolling facility having a work roll shift mill, which is a rolling mill having a control means, which is provided with a tapered crown at the roll end portion of the upper and lower work rolls and is movable in the sheet width direction. It is known to do. Figure 5 shows a schematic diagram of the edge drop where the thickness decreases rapidly near the edge of the plate. Here, the definition of the edge drop amount will be explained. Generally, the edge drop amount is generally defined by a difference in thickness of at least two points with respect to the plate edge. In other words, in Fig. 5, the edge drop amount is defined by the difference between the two plate thicknesses when the plate thickness at the X15 point and the plate thickness at the X115 point are measured.

[0003] Hereinafter, let X15 be a point 15mm from the end of the plate, and X115 be a point 115mm from the end of the plate, and let E be the amount of edge drop. Normally, the edge drop amount E at this time is thin and the edge drop amount E is displayed as positive. On the contrary, the end of the plate may be thicker. At this time, E is negative and is called an edge-up shape. Also, the amount of edge drop is usually different on the left and right sides of the board. Therefore, the amount of edge drop is generally measured by providing instruments at the left and right plate ends.

[0004] Further, a plurality of hot-rolled coils are joined on the entrance side of the rolling mill, the surface scale is removed by passing the joined coils through a pickling facility, and continuously with a plurality of installed rolling mills. In order to improve edge drop in a cold continuous rolling facility that rolls, it is well known to install at least one work roll shift mill in front of the tandem rolling mill, and a method for controlling edge drop using a work roll shift mill A number of known examples have been disclosed. An edge drop meter is installed on the entrance side of the rolling mill to measure edge drop. A number of known examples are also disclosed for a feedforward control method (hereinafter referred to as FF control) in which the shift position of the work roll shift mill is controlled based on the measured value.

[0005] In addition, Patent Document 1 discloses a proposal regarding the installation location of a rolling mill-side edge drop meter in a cold continuous rolling facility, which has a carry-out reel (unwinder), a welder, and a noreper. In a rolling facility, a plate profile meter (edge drop meter) is installed either before or after the welder. The looper is a movable facility that keeps the tension constant. In Patent Document 1, for the purpose of welding, in order to enable rolling even when the flow of rolled material (hereinafter referred to as a plate) stops near the welding machine. It is provided on the exit side of the welder.

[0006] By providing the looper, the edge drop can be measured in a state where the travel of the plate is partially stopped. Therefore, it is possible to use a traveling edge drop meter that runs the measurement terminal of the edge drop meter in the width direction of the plate, enabling accurate measurement. In addition, because it takes enough time for the plate to reach the rolling mill by the looper, the measurement results can be reflected in the set-up of rolling conditions.

[0007] However, in Patent Document 1 described above, the change in the edge drop amount of the base material (plate) may vary greatly from coil to coil. There is no significant change in the plate crown (edge drop amount) within the same coil. Is based on the recognition.

Patent Document 1: JP 2002-126811 A

Patent Document 2: Japanese Patent Application Laid-Open No. 2004-9116

Patent Document 3: Japanese Patent Laid-Open No. 5-15911

Disclosure of the invention

Problems to be solved by the invention

[0008] As will be described later, in the same coil, a change in edge drop is relatively large and changes gently (hereinafter referred to as a long-period fluctuation component), and the change is relatively small but fluctuates drastically. In many cases, components (hereinafter short-period fluctuation components) are mixed. Furthermore, even if the change in the edge drop amount is relatively large for the long-period fluctuation component, the change in the time drop is slow and control is slow, but the change in the edge drop amount is compared for the short-period fluctuation component. Even if it is small, it becomes difficult to control because it changes violently in a short time. Therefore, short-period It is important for edge drop control to suppress fluctuation as much as possible.

[0009] The variation factor of the edge drop amount may be due to the plate thickness variation itself, the measurement accuracy variation of the measuring instrument, or the measurement condition. The present invention pays attention to the fluctuation component of the edge drop caused by the measurement condition, and provides a suitable arrangement for minimizing the fluctuation component. In addition, we will provide cold continuous rolling equipment that can effectively use this arrangement and realize rolling with less edged opening. Furthermore, for rolling of trimming material that cuts off the end of the plate on the entrance side of the rolling machine, we will provide a cold continuous rolling facility that enables rolling with high yield by reducing the trimming amount as much as possible. Means for solving the problem

[0010] The cold continuous rolling facility according to claim 1 of the present invention joins a plurality of hot-rolled coils, corrects distortion of the joined hot-rolled coils with a tension leveler, and passes through the pickling facility. The work roll shift is equipped with equipment that removes the surface scale and continuously rolls with two or more rolling mills, and as the rolling mill, the upper and lower work rolls with a tapered roll crown at the tip can be moved. In a cold continuous rolling facility in which one or more mills are arranged, an edge drop meter is provided between the tension leveler and a tension bridle roll provided on the entrance side of the pickling facility.

[0011] The cold continuous rolling facility according to claim 2 of the present invention joins a plurality of hot-rolled coils, passes the joined hot-rolled coils through a pickling facility, and removes the surface scale. The cold rolling machine equipped with the above-mentioned rolling mill and continuously equipped with one or more work roll shift mills capable of moving the upper and lower work rolls provided with a tapered roll crown at the tip as the rolling mill. In the continuous rolling facility, an edge drop meter is provided between the tension bridle rolls provided on the delivery side of the pickling facility and the pickling facility.

[0012] The cold continuous rolling facility according to claim 3 of the present invention joins a plurality of hot-rolled coils, passes the joined hot-rolled coils through a pickling facility, removes the surface scale, and forms a side trimmer. The work roll shift is equipped with equipment that cuts the plate edge with one and continuously rolling it with two or more rolling mills, and as the rolling mill, the upper and lower work rolls provided with a tapered roll crown at the tip can be moved. In cold continuous rolling equipment with one or more mills installed, An edge drop meter is provided between a dotrimmer and a tension bridle roll provided on the exit side of the side trimmer.

[0013] A cold continuous rolling facility according to claim 4 of the present invention is the cold continuous rolling facility according to any one of claims 1 to 3, wherein the edge drop meter is a traveling edge drop meter. It is characterized by that.

[0014] The cold continuous rolling facility according to claim 5 of the present invention is the cold continuous rolling facility according to any one of claims 1 to 4, wherein the cold continuous rolling facility is welded in the vicinity of either the front or back of the edge drop meter. A point detector and an odometer are provided.

[0015] The cold continuous rolling facility according to claim 6 of the present invention is the cold continuous rolling facility according to claim 5, wherein the cold continuous rolling facility is based on data acquired by the welding point detector and the odometer. Based on the output from the smoothing device that tracks the detection data of the edge drop meter, the smoothing device that smoothes the detection data of the edge drop meter, and the roll shift position of the work roll shift mill is set. A shift setting device is provided.

[0016] A cold continuous rolling facility according to claim 7 of the present invention is similar to the cold continuous rolling facility according to claim 1 or 2, and the side trimmer is configured based on the measurement data of the edge drop meter. A board edge trimming amount is determined.

[0017] The cold continuous rolling facility according to claim 8 of the present invention is the cold continuous rolling facility according to claim 6, wherein the roll shift position of the work roll shift mill is determined based on the output from the smoothing device. It is characterized by presetting.

[0018] The cold continuous rolling facility according to claim 9 of the present invention is the cold continuous rolling facility according to claim 6, wherein the shift setting device is based on edge drop data output from the smoothing device. This is characterized by feedforward control of the shift position of the upper and lower work rolls.

The invention's effect

[0019] According to the cold rolling facility according to claim 1 of the present invention, the edge drop meter is disposed after the tension leveler, and the tension bridle roll is disposed in the vicinity of the edge drop meter. After the leveler corrects the shape of the base coil (plate), Since the edge drop amount can be measured in a state in which the vibration of the plate is suppressed due to the action of the plate, measurement errors can be reduced and appropriate rolling can be performed.

[0020] According to the cold rolling facility according to claim 2 of the present invention, the edge drop meter is disposed after the pickling facility, and the tension bridle roll is disposed in the vicinity of the edge drop meter. After the surface scale has been removed by the washing equipment, the amount of edge drop can be measured with the tension applied, so measurement errors can be reduced and proper rolling can be achieved.

[0021] According to the cold rolling facility according to claim 3 of the present invention, the edge drop meter is disposed after the side trimmer, and the tension bridle roll is disposed in the vicinity of the edge drop meter. Since the edge drop amount can be measured in a state where the tension is applied and the vibration of the plate is suppressed after the plate width becomes substantially constant, the measurement error can be reduced and proper rolling can be performed.

[0022] According to the cold rolling equipment according to claim 4 of the present invention, by using the traveling edge drop meter, the edge drop amount can be measured by reciprocating the measurement terminal in the plate width direction. As a result, the number of measurement terminals can be reduced, and the equipment cost can be reduced.

According to the cold rolling facility according to claim 5 of the present invention, the measured edge drop data is accurately tracked by installing the welding point detector and the odometer in the vicinity of the edge drop meter. As a result, measurement errors can be reduced and appropriate rolling can be performed.

[0024] According to the cold rolling facility according to claim 6 of the present invention, the change in the edge drop amount is reduced by providing a tracking device, a smoothing device, and a shift setting device in the cold continuous rolling facility. Rolling can be performed on the basis of data that removes relatively short but fluctuating components that change drastically in a short period of time, enabling more precise edge drop suppression.

[0025] According to the cold continuous rolling facility according to claim 7 of the present invention, the trimming amount according to the edge drop amount is determined by determining the plate end trimming amount of the side trimmer based on the measurement data of the edge drop meter. Rolling with a high yield can be performed while minimizing the amount.

[0026] According to the cold continuous rolling facility according to claim 8 of the present invention, it is based on the data of the smoothing device. Since the roll shift position of the work roll shift mill is preset, an appropriate roll shift position can be provided for the edge drop of the rolled material.

[0027] According to the cold continuous rolling facility according to claim 9 of the present invention, the work roll shift mill is FF-controlled based on the edge drop data from which the short-period fluctuation component is eliminated by the smoothing device. Rolling can be performed.

Brief Description of Drawings

FIG. 1 is an explanatory diagram showing an example of cold continuous rolling equipment according to the present invention.

FIG. 2 is an explanatory diagram showing an example in which an error occurs by measuring the plate thickness with the plate tilted.

FIG. 3 is a graph showing measurement errors when H = 2.5 mm in FIG.

FIG. 4 is a graph showing changes in edge drop due to rolling.

FIG. 5 is a cross-sectional view showing an edge drop.

FIG. 6 is an explanatory view showing an example in which the plate edge shape varies.

FIG. 7 is a graph showing a variation example of edge drop in one coil.

FIG. 8 is a graph showing an example in which short-period fluctuation components are removed from edge drop data.

FIG. 9 is a graph showing an example in which the moving average width in the moving average is treated as 200 m in terms of the outgoing side rolling length.

FIG. 10 is an explanatory diagram showing an example of FF control of a cold continuous rolling facility according to Example 4 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 shows an example of cold continuous rolling equipment according to an embodiment of the present invention. In the cold continuous rolling equipment, the plate is fed from the unwinder 5 and welded 6, looper 15, tension bridle roll 3, tension leveler 7, tension bridle roll 3, pickling equipment 8, tensioning Pass through bridle roll 3, looper 15, side trimmer 9, norepa 15, tension bridle roll 3, and tandem rolling mill 11, and the plate shape is measured by shape detector 12, passing through split shear 13 and scraper 14 To be beaten.

[0030] The unwinding machine 5 is a facility for feeding the base material coil (plate) to the rolling mill side, the welding machine 6 is a facility for joining a plurality of plates, and the looper 15 is a plate of a length required to enable continuous rolling. Board storage equipment, tension bridle roll 3 is equipment to tension the board, tension Leveler 7 is equipment that corrects the distortion of the plate shape, pickling equipment 8 is equipment that removes the surface scale of the multiple plates that are joined together, side trimmer 9 is equipment that cuts off the edge of the plate, tandem rolling mill 11 Is a facility that continuously rolls the plate with a plurality of rolling mills, a shape detector 1 2 is a facility that inspects the shape of the plate after rolling, and a split shear 13 is a facility that cuts the plate into a predetermined length or is wound up Machine 14 is a facility for winding and unloading plates. In FIG. 1, 2a to 2d are edge drop meters, and 4a to 4d are welding point detectors.

[0031] Furthermore, one work roll shift mill 10 is disposed in the front stage of the tandem rolling mill 11. The work roll shift mill 10 is a rolling mill having work roll shift control means that is provided with a tapered crown at the roll end portions of the upper and lower work rolls so as to be movable in the plate width direction.

[0032] The cold continuous rolling facility according to the present embodiment uses an edge drop meter 2a and a welding point detector 4a among the edge drop meters 2a to 2c and the weld contact detectors 4a to 4c shown in FIG. It is a thing. That is, the X-ray edge drop meter 2a is arranged on the downstream side of the tension leveler 7 and on the upstream side of the tension bridle roll 3. The tension bridle roll 3 is installed in front of the pickling equipment 8, and a welding point detector 4a and an odometer (not shown) are installed in front of the tension leveler 7. The edge drop meter 2a is a facility for measuring the edge drop amount of the plate, the welding point detector 4a is a facility for detecting the welded portion of the plate, and the odometer is a facility for measuring the travel distance of the plate.

[0033] As shown in Fig. 2, the X-ray edge drop meter 2a is provided with an X-ray generation terminal 21 and a reception terminal 22 above and below the base material, and the amount of X-ray transmitted through the generation terminal 21 to the reception terminal 22 The plate thickness is detected by measuring. Further, as described in Patent Document 2, for example, the welding point detector 4a makes a punch hole in a plate near the welding point, and detects this position with a photocell or the like. Furthermore, the odometer measures the mileage of the plate with reference to the welding point. For example, a cell thin is installed on the drive motor of the tension bridle roll 3 shown in FIG. 1, and the roll diameter and drive motor of the tension bridle roll 3 are installed. The travel distance of the plate can be calculated from the number of rotations.

[0034] The purpose of installing the welding point detector 4a and the odometer is to accurately track the measured edge drop data. Subsequent work roll shift mill 10 When performing FF control on a group, particularly accurate tracking is required. This is because if FF control is performed based on inaccurate tracking data, the edge drop shape may be deteriorated.

[0035] The welding point detector 4a is installed near the entrance side of the tension leveler 7 because the plate thickness is different between before and after the welding point. This is because the case may be changed. Welding point detector 4a may be used for tracking X-ray edge drop meter 2a output. In addition, the installation location of the welding point detector 4a and the odometer is not limited to the position described above, and it may be installed either before or after the tension bridle roll 3. The edge drop meter is not limited to the X-ray edge drop meter.

Here, the measurement error will be briefly described with reference to FIG. If there is a wave due to vibration or shape failure of the plate, the plate thickness of the plate 1 may be measured with an angle with respect to the horizontal direction between the measurement terminals. In such a case, the measured plate thickness H ′ is different from the actual plate thickness H, and when the plate inclination is Θ, the measurement error δ 時 at this time is as shown below.

[0037] δ Η = Η '-H = H / cos (θ) ~ Η

[0038] Figure 3 shows the relationship between the inclination angle Θ and the measurement error δ 仮定 when Η = 2.5 mm. It can be seen that when the plate is tilted by about θ = 5 °, a measurement error of SH = about 10 / m occurs. The above error component is observed as a fluctuation component corresponding to the vibration of the plate, for example.

[0039] Further, the fluctuation component force of the base material edge drop amount as described above will be described in general how it appears in the final product. Figure 4 is a graph showing an example of the correlation between the entrance edge drop amount Ein before rolling and the exit edge drop amount Eout after rolling. The horizontal axis is the entrance edge drop amount Ein before rolling, and the vertical axis is 5 Egress edge drop after stand tandem rolling Eout. The line segment in the figure is the average of the measured values and shows the data when the total rolling reduction is about 75%. The data includes materials (general carbon steel), sheet width, entry side sheet thickness, rolling speed and other different rolling conditions. The work roll is a straight roll, and edge drop control is performed. Nare ,.

[0040] According to FIG. 4, the input side edge drop amount Ein and the output side edge drop amount Eout are strong. If a correlation is observed and the ingress edge drop Ein fluctuates 10 _β m, it is expected that a fluctuation of about 2.4 / im will appear in the egress edge drop Eout. In particular, for silicon steel sheets, where the amount of edge drop is strict, the final exit edge drop amount is often regulated within 5 _β m. Considering this situation, it can be said that a change of the incoming edge drop amount of about 10 zm has a non-negligible effect on product quality.

[0041] That is, if the error component shown in Fig. 2 is recognized as the actual edge drop amount and FF control is applied, even if there is no edge drop on the base material (plate), FF control associated with the measurement error 2. A fluctuation of about 4 zm will occur. Therefore, it is necessary to prevent as much as possible the plate vibration and shape disturbance in the measurement section for products with more demanding edge drop amount. On the other hand, if an edge drop meter is installed at the position of this embodiment, the error component due to plate vibration and shape disturbance at the measurement unit is suppressed as much as possible, and it is possible to measure edge drops with high accuracy and small fluctuations. Become.

[0042] As described above, if the edge roll gauge 2a is installed between the tension leveler 7 and the tension bridle roll 3, and the FF control is performed on the work roll shift mill 10,

1) Edge drop can be measured under conditions where tension is applied and vibration of the plate is suppressed.

2) Edge drop can be measured after the shape of the base coil (plate) is corrected. There are advantages. This makes it possible to reduce the edge drop measurement error caused by the vibration of the plate and the distortion of the base material shape. This has the effect of suppressing fluctuations in the amount of short-term edge drop.

Example 1

[0043] The cold continuous rolling facility according to Example 1 of the present invention includes an edge drop meter 2b and a welding point detector 4b among the edge drop meters 2a to 2c and the welding point detectors 4a to 4c shown in FIG. It is what is used. That is, an X-ray edge drop meter 2b is installed between the exit side of the pickling equipment 8 and the tension bridle roll 3. The tension bridle roll 3 is installed between the pickling equipment 8 and the looper 15 arranged after the pickling equipment 8. Furthermore, a welding point detector 4b and a plate odometer are arranged between the pickling facility 8 and the X-ray edge drop meter 2b, which are in the vicinity of the X-ray edge drop meter 2b. In addition, the description which overlaps with said "best form" was abbreviate | omitted. [0044] In the above-mentioned "best mode", edge drop may be measured in the presence of oxidation scale or surface contamination on the plate surface that occurs during and after hot rolling. If there is oxide scale or surface contamination on the plate surface in this way, X-ray scattering or transmission variation may occur during edge drop measurement, causing an error in the edge drop measurement value. Such errors are random noise-like and are thought to cause short-term fluctuations in edge drop measurements.

[0045] However, if the X-ray edge drop meter 2b is installed after the pickling equipment 8 according to the first embodiment, the edge drop amount is measured after removing the surface scale of the plate. The problem of measurement errors due to surface shape disturbance is eliminated. Also, the plate is after passing through the tension leveler 7, and errors due to the shape of the base material (plate) are not a problem. Naturally, since the edge drop amount can be measured in a state in which the plate tension is applied by the tension bridle roll 3, the vibration can be suppressed to a small level and the error factor can be eliminated.

[0046] Further, in a normal cold continuous rolling facility, a side streamer 9 for cutting off the plate end is installed after the pickling facility 8. The purpose of the side trimmer 9 is to remove the edge of the plate that is difficult to control by cold rolling, in the edge drop region of products where the demand for edge drop is severe. In particular, when rolling to a thin plate, it is generally necessary to apply a strong reduction, and edge cracking may occur. To prevent this, both ends must be cut off. Hereinafter, such a plate is referred to as a trim material. A typical trim material is electrical steel.

[0047] The trimming amount by the side trimmer 9 greatly affects the production yield, so it is desirable to reduce it as much as possible. For this purpose, the edge drop amount is measured before trimming, and the result is reflected in the trimming amount. For example, when the edge drop amount of the base material is small, the trimming width is reduced. Furthermore, the base metal shape may be an edge-up shape. This is mainly caused by wear of the plate end portion of the hot-rolling roll. Such a shape has the effect of suppressing the edge drop amount in cold rolling, and the force S is positive to set the trimming width small.

However, the edge drop amount changes with respect to the longitudinal direction of the plate. In particular, the fluctuation amount of the edge drop amount is generally larger at the tip end portion of the base material before and after the joining point than at other portions. Therefore, trimming When determining the amount, if the edge drop measurement length is short, the probability that irregularity will occur in the set trimming width increases.

[0049] For example, installing the X-ray edge drop meter 2b immediately before the side trimmer 9 is not appropriate because the measurement length is not sufficient. However, in Example 1, the looper 15 exists on the exit side of the X-ray edge drop meter 2b. Therefore, edge drop measurement can be performed over a sufficiently long distance according to the loop amount before trimming, and an appropriate trimming width can be determined.

As described above, according to the cold continuous rolling facility according to “Example 1”, as a second action, the X-ray edge drop meter 2b is installed before the side trimmer 9, and the looper 15 is installed in the X-ray. It can be said that an effective trimming width can be provided for the trim material by installing it on the exit side of the edge drop meter 2b. Even in the “best mode” described above, by installing the looper 15 on the exit side of the edge drop meter 2a, it is possible to provide an effective trimming width for the trim material.

Example 2

[0051] The cold continuous rolling facility according to Example 2 of the present invention includes an edge drop meter 2c and a welding point detector 4c among the edge drop meters 2a to 2c and the welding point detectors 4a to 4c shown in FIG. It is what is used. That is, the X-ray edge drop meter 2 c is installed between the exit side of the side trimmer 9 and the entrance side of the tension bridle roll 3. At this time, it is the same as “Best Mode” and “Example 1” that the welding point detector and the travel distance meter are provided near the X-ray edge drop meter 2c. Also, a welding point detector 4c is usually installed in front of the side trimmer 9. This is because when a plate with a different width is connected, it is necessary to change the blade position. Of course, the welding point detector 4c can be used as a welding point detector for tracking.

However, it is conceivable that the vibration at the time of trim is transmitted to the plate, and this changes the measurement data of the edge drop amount. Accordingly, it is preferable to provide a restraining means for restraining plate vibration after the side trimmer 9 and before the X-ray edge drop meter 2c. For example, a pinch roll (not shown) that presses the top and bottom of the plate is installed. In addition, the looper 15 is arranged after the tension bridle roll 3. In addition, the explanation overlapping with the above-mentioned “best mode” and “Example 1” Omitted.

[0053] Generally, the plate width and plate end shape of a hot-rolled base material (plate) vary. Figure 6 shows a schematic diagram of the variation of the plate edge shape in the plate. For a changing plate edge shape, the edge drop meter usually outputs the plate thickness difference at a predetermined position with reference to the plate edge. For example, measure the plate thickness at plate end force X15 points and XI I 5 points, and evaluate the edge drop amount by the difference between them.

In this case, as long as the plate end is used as a reference, the evaluation points X15 and XI15 vary so as to follow the plate end shape as indicated by the broken line in FIG. It is assumed that edge drop control is performed in such a state, and the edge drop amount E force S between point X15 and point X115 on the final stand exit side is controlled to a predetermined allowable capacity, for example, 5 μm or less. .

When the end user uses the plate as described above, the plate width in the longitudinal direction of the plate may be constant, and for example, it may be used by cutting along a trimming line Tr shown in the drawing. At this time, there is a possibility that a part having an edge drop amount exceeding a predetermined allowable value may occur, such as part A. In other words, it can be said that product quality assurance becomes difficult. In order to avoid this, the trimming line Tr may be set more inside the plate. In this case, the yield of the product is reduced.

[0056] The problem of edge drop control is caused by the fact that the edge of the edge drop measurement is used as the edge of a board with fluctuations in the board width. On the other hand, it is conceivable to measure the plate width as in Patent Document 3 and use the center of the plate width as a reference for edge drop measurement. The problem still remains in this case.

[0057] In Fig. 6, the plate end shape opposite to the left end shape Le is the right end shape Re, and the shapes are the same. Here, the plate width at each instant in the plate longitudinal direction is measured, and the center is defined as the plate width center Cn. As shown in the figure, the sheet width center Cn varies according to the sheet width variation at each moment. In this example, even if the plate width center Cn is used as a reference for edge drop measurement, the result is exactly the same as when the plate edge is used as a reference. In the actual plate, the shape of the plate ends at the left and right ends is uneven. Therefore, even if the plate width center Cn is determined by measuring the plate width, the plate width center Cn will fluctuate. As described above, even if the changed center width Cn is used as the standard for edge drop measurement, problems may occur on the end user side.

[0058] The above becomes a problem particularly when a board or plate with a small edge drop amount is required. For example, electric Magnetic steel sheets are applicable.

However, according to the second embodiment, since the edge drop is measured after the trimming by the side trimmer 9, the board width is substantially constant after the trimming, and the board width and the edge shape of the board are measured. There is no need to consider fluctuations. Therefore, edge drop control becomes simple and high-precision control is possible. Furthermore, excluding the range up to the edge drop evaluation point closest to the plate edge force, it is possible to provide a high-quality product with a guaranteed edge drop amount. As a result, the required edge drop amount of the magnetic steel sheet or the like is particularly severe, and provision of rolling equipment is achieved.

[0060] In the "best mode", "Example 1", and "Example 2", the example in which the edge drop meters 2a, 2b, and 2c are individually installed is shown, but the present invention is not limited to this. For example, “Best Mode” and “Example 1”, “Example 1” and “Example 2”, “Best Mode” and “Example 2”, or “Best Mode” and “Example” Rolling may be performed using the arrangement of the edge drop gauges 2a, 2b, and 2c shown in “2” and “Example 2” together.

Example 3

[0061] The cold continuous rolling facility according to Example 3 of the present invention removes the short-period fluctuation component of the measured edge drop data and controls the long-period fluctuation component.

[0062] The "best mode", "Embodiment 1", and "Embodiment 2" of the present invention described above suppress the occurrence of edge drop measurement data, particularly the occurrence of short-period fluctuation components, and perform edge drop control. It is the description regarding the arrangement | positioning which achieves easy and highly accurate precision. On the other hand, in the present embodiment, a control device that effectively utilizes the above arrangement will be described. In particular, in the conventional known example, there is no disclosure regarding the processing method of the measured edge drop data.

An example of edge drop fluctuation within one coil is shown in FIG. In Fig. 7, the horizontal axis represents the rolling length in terms of final delivery by 5-stand tandem rolling, and the vertical axis is synchronized with this, corresponding to the amount of edge drop E-WS and drive side before rolling. The edge drop amount E—DS was shown. The entry side and product thickness are nominally 2.3 mm and 0.64 mm, respectively, which is an example of rolling with general carbon steel.

[0064] From this figure, the workpiece side edge drop amount E-WS and the drive side edge drop amount E-DS are different from each other. Although the amount is small, a component that fluctuates violently in a short period can be observed. On the other hand, when edge drop is controlled by work roll shift, the shift speed is slow, so that sufficient response cannot be made to fluctuations of short-period fluctuation components. The normal shift speed is about 2mm / _sec or less.

[0065] The general rolling speed is about 600 mZmin to 1200 m / min, and the rolling speed is much higher than the shift speed. As a result, it is clear that even if FF control is performed for fluctuations in the short-period fluctuation component of the edge drop, the work roll shift cannot sufficiently cope with it. On the other hand, the control system may diverge or fluctuate due to a delay in response to the shift.

In contrast to the above, FIG. 8 shows an example in which the short-period fluctuation component is removed. The thick line INVent D in Fig. 8 is an example in which the Fourier transform was applied to the exit side rolling equivalent length L of approximately 1500m of the edge drop fluctuation on the entry side, and the fluctuation component of 3 cycles or more with respect to the analysis range was removed. It is. The thin edge EDentD shows the measured edge drop data in the same section as a reference. In this way, it is possible to remove short-period fluctuation components and extract long-period fluctuation components that are easy to control.

[0067] Therefore, according to the third embodiment, the short-period fluctuation component of the measurement edge drop data is removed, and the FF control is performed on the long-period fluctuation component. Real and highly accurate edge drop control becomes possible.

[0068] Further, the fluctuation amount of the removed short-period fluctuation component is often relatively smaller than the fluctuation amount of the long-period fluctuation component. In the example in Fig. 8, the fluctuation amount of the long-period fluctuation component is about 15 μΐη for the entire coil length, whereas the fluctuation amount of the short-period fluctuation component around this is about 3 / im. The effect of the short period fluctuation component fluctuation amount of about 3 μm on the final edge drop amount is about l x m in view of Fig. 4, and is not regarded as a very small problem.

[0069] The effect of the third embodiment can be obtained by performing control on the fluctuation component from which the short-period fluctuation is removed (hereinafter referred to as smoothing process). In addition to the Fourier transform, the smoothing process as described above can be performed by, for example, a moving average process or an interval approximation method using a low-order function such as a second or third order. These smoothing processes are well known in general literature. Adopt it.

Furthermore, the fluctuation component range to be removed in the Fourier transform is not particularly problematic as long as it is determined from experience or actual measurement data. The same applies to the setting of the moving average width in the moving average. The thick line MAentD in Fig. 9 shows an example in which the moving average width based on the moving average is set to 200 m by converting the output side rolling length. The thin line EDentD shows the moving average in the same section for reference. In any case, it can be seen that the short-period fluctuation component is well removed.

[0071] However, in order to perform the above-described processing on the measurement data, it is necessary to record the measurement data before rolling for a predetermined time. Therefore, the installation position of the edge drop meter shall be a place where data can be recorded for a predetermined time before rolling. As such an installation place, it is preferable to install on the entrance side of the looper installed in front of the rolling mill. As a result, it is possible to record and hold edge drop data in the longitudinal direction of the plate according to the length of the looper shell. In addition, it is possible to secure a processing time for performing the smoothing process.

As described above, by executing the processing as described above, a control system with a small response delay can be realized, and highly accurate and reliable control can be performed. Further, this result can be reflected in presetting of the work tool position, FF control, etc., as in the case of Patent Document 1.

Example 4

An example in which the data obtained by removing the short-period fluctuation component of the measurement edge drop data according to the fourth embodiment of the present invention is applied to the FF control will be described with reference to FIG. An X-ray edge drop meter 2c is installed between the side trimmer 9 and the tension bridle roll 3, and on the exit side of the side trimmer 9, a pinch roll 19 that suppresses plate vibration during trimming and a welding point detector 4c are arranged in this order. Arranged. In particular, the pinch roll 19 is provided with a cercin or the like, and the rotation distance of the roll is measured to determine the travel distance of the plate.

[0074] The outputs of the pinch roll 19, the welding point detector 4c, and the X-ray edge drop meter 2c are input to the tracking device 16. In the tracking device 16, the measured data force of the edge drop amount with respect to the travel distance of the plate with the weld point of the plate being zero is sequentially tracked and recorded. The recorded data is input to the smoothing device 17, where long-period fluctuation components are separated and extracted. Is issued. The long-period fluctuation component is input to the shift setting device 18, and based on this, the upper and lower work roll shift positions of the work roll shift mill 10 are set and controlled, respectively.

In FIG. 10, there are two shift position command signals AS for each of the upper and lower work rolls.

E

The edge drop measurement is measured at both ends of the plate width, indicating that each is controlled independently. However, the measurement signal line E 'is displayed as a single line.

[0076] The shift position set and controlled by the shift setting device 18 will be briefly described using the following equations.

[0077] d e / 3 E: Influence coefficient that the change amount of the incoming edge drop has on the change amount of the outgoing edge drop

[0078] d e / 3 S: Influence coefficient that the work roll shift amount of the shift stand exerts on the change amount of the outgoing edge drop

Here, the change amount ΔE of the long-period fluctuation component of the incoming edge drop, and the shift position change amount AS that serves as a shift position command signal for controlling this are controlled as follows.

E

That's fine.

[0080] (3 e / 3 E) Δ E + (3 e / 3 S) Δ S = 0

E

[0081] The influence coefficient is easily obtained from actual measurement data, for example. In addition, when the recorded and smoothed portion is rolled, new edge drop data is recorded. Naturally, smoothing processing is performed and FF control is continued.

[0082] Hereinafter, ΔΕ will be supplemented. If the current time is T, the next control command is after ΔΤ, the edge drop amount at time における IJT is Ε (Τ), and the edge drop amount after ΔΤ is Ε (Τ + ΔΤ), then ΔΕ is It makes sense.

[0083] ΔΕ = Ε (Τ) -Ε (Τ + ΔΤ)

However, the edge drop data E (t) used in this embodiment is different from the measurement data itself because it is the data after the smoothing process. In other words, if the measured incoming edge drop time-series data is E ′ (t), the edge drop E (t) in this embodiment has the following meaning.

[0085] E (t) = {smoothing process} E '(t)

FIG. 10 also shows a case where FB control is performed. For FB control, output side measurement The control shift change amount A Se is determined by the FB controller 20 so that the difference between the didrop amount _e and the target edge drop amount _e is as follows.

[0087] e-e + (3 e / 3 S) Δ Se = 0

[0088] When performing FF and FB control simultaneously, add Δ Se and Δ S as shown in Fig. 9.

E

Shift position control.

[0089] The above mainly describes the FF control device. In this case, it is desirable that the edge drop amount is continuously measured at the same measurement point in the longitudinal direction of the plate. On the other hand, when used to preset the roll position of the shift mill, it is not always necessary to measure the edge drop continuously.

For example, the edge drop meter is a traveling edge drop meter. The traveling-type edge drop meter is an edge drop meter that enables the measurement terminal to travel in the plate width direction, that is, the edge drop amount is measured by reciprocating the X-ray generation terminal and the reception terminal in the plate width direction in the required measurement section. Measure. In this way, two X-ray receiving / starting terminals are sufficient when measuring two locations on the left and right plate edges. As a result, the number of measuring terminals of the edge drop meter can be reduced, and the equipment cost can be reduced.

[0091] When a traveling edge drop meter is used, for example, a predetermined plate length is stored for the plate thickness measured at X15 and X115, and an average of each is obtained. Next, the difference in average plate thickness is obtained, and this is used as the average edge drop amount. Based on the average edge drop amount, the work roll shift of the next coil (plate) is determined and preset. Therefore, it is not necessary to stop the traveling of the plate even if the traveling type edge drop meter is used. Conversely, by running the plate, it can be said that an average in a longer section in the rolling length direction is obtained.

Furthermore, when presetting the shift position, it is important to carry out based on the average edge drop amount. Before and after the welding point, it corresponds to the front and rear ends of the plate in hot rolling, resulting in unsteady rolling. As a result, the amount of change in edge drop is often larger than other parts. If the shift position is preset based on one point of such a large measured fluctuation component, the probability that the shift position will be excessive or small will increase.

[0093] When the position based on the above-described variation component is changed to an appropriate shift position, there is a problem that a part that is not well controlled and has a slow shift response becomes long. In contrast, variable growth If presetting is based on the average edge drop amount of minutes, the problem that the part that is not well controlled becomes long can be avoided as much as possible.

Industrial applicability

INDUSTRIAL APPLICABILITY The present invention can be used for cold continuous rolling equipment that continuously rolls with a plurality of rolling mills in plate rolling.

Claims

The scope of the claims

[1] Join a plurality of hot-rolled coils, correct the distortion of the joined hot-rolled coils with a tension leveler, pass through a pickling facility, remove the surface scale, and connect with two or more rolling mills. In the cold continuous rolling facility provided with one or more work roll shift mills equipped with a facility for rolling continuously and having movable upper and lower work rolls provided with a tapered roll crown at the tip as the rolling mill. A cold continuous rolling facility characterized in that an edge drop meter is provided between a leveler and a tension bridle roll provided on the entrance side of the pickling facility.

[2] Joining a plurality of hot-rolled coils, passing the joined hot-rolled coils through a pickling facility, removing the surface scale, and equipped with a facility for continuous rolling with two or more rolling mills, and In the cold continuous rolling facility in which one or more work roll shift mills capable of moving the upper and lower work rolls having a tapered roll crown at the tip as the rolling mill are arranged, the pickling equipment and the pickling equipment A cold continuous rolling facility characterized in that an edge drop meter is provided between tension bridle rolls provided on the outlet side.

[3] Join a plurality of hot-rolled coils, pass the joined hot-rolled coils through a pickling facility, remove the surface scale, cut off the plate edge with a side trimmer, and connect with two or more rolling mills. In a cold continuous rolling facility provided with one or more work roll shift mills equipped with a continuous rolling facility and capable of moving an upper and lower work roll provided with a tapered roll crown at the tip as the rolling mill. And a cold continuous rolling facility, wherein an edge drop meter is provided between the tension bridle rolls provided on the outlet side of the side trimmer.

[4] The cold continuous rolling facility according to any one of claims 1 to 3, wherein the edge drop meter is a traveling edge drop meter.

[5] The cold continuous rolling facility according to any one of claims 1 to 4, wherein a welding point detector and an odometer are provided in the vicinity of either the front or back of the edge drop meter. Cold continuous rolling equipment.

6. The cold continuous rolling facility according to claim 5, wherein the detection data of the edge drop meter is tracked based on data acquired by the welding point detector and the travel distance meter. A tracking device for smoothing, a smoothing device for smoothing the detection data of the edge drop meter, and a shift setting device for setting the mouth shift position of the work roll shift mill based on the output from the smoothing device. Cold continuous rolling equipment characterized by

[7] The cold continuous rolling facility according to claim 1 or 2, wherein a plate end trimming amount of the side trimmer is determined based on measurement data of the edge drop meter.

8. The cold continuous rolling facility according to claim 6, wherein a roll shift position of the work roll shift mill is preset based on an output from the smoothing device.

[9] The cold continuous rolling facility according to claim 6, wherein the shift setting device feed-forward-controls the shift position of the upper and lower work rolls based on the edge drop data output from the smoothing device. Cold continuous rolling equipment.