KR101449207B1 - Method and Apparatus for Manufacturing Plate - Google Patents

Abstract

An apparatus and a method for manufacturing a thick plate through rolling, calibrating, and cooling steps are provided.
The thick plate manufacturing apparatus includes: an extruder and a longitudinal extruder for rolling a material passed through a heating furnace; an accelerator cooler for cooling the rolled heavy plate; And a hot calibrator for calibrating the cooled cold plate, wherein the accelerator cooler and the longitudinal cold rolling mill are connected to each other via a hot calibrator and a control unit, and the flatness of the thick plate is measured, and the cooling and rolling conditions are fed back And a plate flatness gauge provided on the output side of the accelerating cooler to feed forward the calibration condition.
According to the present invention as described above, the measured plate flatness can be improved by rolling (lengthwise rolling) and accelerated cooling, and further preliminary calibrating and restraining rolls Feed back to the control and feed forward to the hot calibration, thereby effectively removing the residual stress causing the flatness defect of the thick plate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for manufacturing a thick plate through rolling, calibrating and cooling steps, and more particularly, , Feeding back to the rolling, cooling and (preliminary) calibration conditions from the measured flatness of the measured plate, and feed-forwarding the (hot) calibration conditions to effectively remove the residual stress causing the flatness of the thick plate Manufacturing apparatus and method.

1, a known thick plate manufacturing process includes a heating furnace 100, a rough finishing mill 200, a longitudinal finishing mill 200, And the cooling plate 700 to form the thick plate 1, as shown in FIG.

However, such a thick plate process tends to cause plate deformation because the plate is deformed due to high-temperature plate-making, steel cooling, and steel calibration. The main cause of plate deformation of such a plate is due to residual stress, The stressed plate is a main cause of deteriorating the flatness in the post-process even after the process is completed.

2A and 2B, the arrangement of the flatness meter 8 for measuring the flatness of the plate in the conventional thick plate manufacturing process is briefly shown. However, the flatness meter 8 is arranged on the out side of the longitudinal rolling mill 200 Or placed on the outgoing side of the hot straightener 600.

That is, the flatness meter 8 is disposed at a position where flatness measurement of the thick plate is required, that is, on the exit side of the hot-dip mill 300 and the hot-wire straightening machine 600 where flatness defect is likely to occur due to poor calibration.

For example, in the production of a thick plate, elongation variation occurs in the longitudinal direction of the plate due to non-uniform change of the inlet side crown and the outlet side crown at the time of ultrafine rolling, resulting in defective shape of the heavy plate. An edge wave EW and a center wave CW may be generated as shown in FIG.

In Fig. 3C, the flatness of the thick plate is shown, and the pitch P and the height H of the flatness are measured using the flatness meter 8.

Accordingly, at the time of manufacturing the thick plate, in order to confirm whether or not the shape defect of the thick plate occurs or not in correspondence with the shape defect, the rolling condition and the cooling condition at the rolling step, And the flatness meter 8 is disposed to measure the flatness of the thick plate.

The flatness measurement of the thick plate through the flatness meter 8 measures the flatness pitch P and the height H of FIG. 3C, for example, the flatness meter 8, The laser L is projected onto the surface of the plate through the laser beam of the laser beam, the shape defect of the plate is photographed by the camera, and the data is processed into the flatness data through the data signal processing.

Therefore, as shown in FIGS. 2A and 2B, the flatness measured in the conventional flatness meter 8 can be applied only to the longitudinal strip rolling, and the flatness measured after the hot stripping machine can be measured by a width- Since it is a flatness measurement after several steps such as a rolling mill, a preliminary calibrator and an accelerating cooler, there is a practical limit to removing the residual stress in connection with the operation control in the previous step.

On the other hand, as shown in Fig. As another example of the conventional method, in the thick plate process, the flatness defect of the thick plate is judged visually by the naked eye after the thickening and the longitudinal cold rolling, the preliminary steel roughing correction or rough preliminary correction is performed, Was judged by the naked eye, and a steel calibration or a weak calibration was performed in the hot calibration, and the plate was transferred to the cooling plate to complete the process.

However, such a conventional method has a problem that it is difficult to solve the plate deformation problem after the completion of the process due to the residual stress, and it is difficult to cope with the flatness problem that occurs after accelerated cooling.

On the other hand, Japanese Laid-Open Patent Publication No. 1998-005868 discloses a technique for controlling the shape of a control cooling steel sheet. In the case of the Japanese Laid-Open Patent Application, the cooling plate is controlled on the basis of the measured plate flatness However, in the case of the Japanese patent, the steel plate is mainly used, which is different from the basic manufacturing process of the heavy plate described in Fig. 1 related to the present invention.

That is, in the case of the Japanese Laid-Open Patent Application, the accelerator cooler is applied only to the thick plate manufacturing process, which is the final process, and only the feedback control is possible, and therefore, there is no hot calibration or rolling control.

Therefore, in order to solve the above-mentioned conventional problems, it is possible to feed back to the rolling, cooling, preliminary calibrating or constraining roll conditions from the flatness measurement value of the thick plate through the lay-out improvement of the line where the flatness meter is arranged on the exit side of the accelerator cooler, There has been a demand for an apparatus and a method for manufacturing a thick plate which can effectively remove the residual stress causing a flatness defect of the thick plate by feed forwarding to the hot correction or other constraining roll conditions.

In addition, it is possible to construct a flatness meter through a simulation step, a stretching step through a constraint roll (pinch roll) control on the side of a calibrator or an exit side, and a hot calibration step based on a caliper roll, A flat plate manufacturing apparatus and a method for improving the quality of a thick plate product have been demanded.

According to an aspect of the present invention, there is provided a rolling mill including a rolling mill for rolling a material through a heating furnace, an accelerating cooler for cooling the rolled steel plate, a hot- And a flatness gauge connected to the accelerating cooler and the rolling mill through a hot calibrator and a control unit and provided on the output side of the accelerating cooler for measuring the flatness of the heavy plate,
And a preliminary calibrator provided on the exit side of the longitudinal end mill, wherein the preliminary calibrator is provided with a flat plate manufacturing apparatus connected to the flatness meter through a control unit do.

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According to another aspect of the present invention, there is provided a method of manufacturing a rolled steel sheet, comprising the steps of sequentially rolling and hot rolling a heated material; accelerating the rolled steel plate; And a hot calibration step of calibrating the cooled thick plate,

Measuring the flatness of the thick plate after the accelerated cooling step using a flatness meter, feeding back the cooling and rolling conditions from the measured flatness measurement values, and feeding forward the calibration conditions .

According to the present invention, through the lay-out improvement of the production line in which the flatness meter is disposed on the exit side of the accelerating cooler, the measured plate flatness is measured by rolling (longitudinal rolling) and accelerated cooling, Feed back to the roll control and feed forward to the hot calibration, thereby effectively removing the residual stress causing the flatness defect of the thick plate.

In addition, the present invention can be applied to an apparatus for constructing a flat sheet by ensuring consistency through a flatness level simulation step, a drawing step by controlling a constraining roll (pinch roll) on the side of a calibrator or an output side, It is possible to secure the flatness in the longitudinal direction of the thick plate and ultimately to provide another effect of improving the quality of the thick plate product.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a process diagram illustrating a known thick plate manufacturing process in accordance with the present invention.
Figs. 2A and 2B are schematic views showing the arrangement of the flatness meter in the conventional thick plate process
3A to 3C are a photograph and a schematic perspective view showing the edge, center wave,
5A and 5B are diagrams showing a conventional process for manufacturing a thick plate according to the present invention
FIG. 6 is a detailed view showing a part of the process of manufacturing the inventive thick plate of FIG.
Fig. 7 is a flowchart showing the process of manufacturing the inventive thick plate of Fig. 6
8A and 8B are schematic perspective views showing rolling, cooling and hot calibrating steps according to the present invention;
9A to 9C are schematic views showing a state in which the flatness defect of a thick plate is measured by a flatness meter and a flatness defect element of the thick plate
Figs. 10A to 10D are diagrams showing a simulation apparatus for evaluation of conformity of flatness of the present invention
11A to 11C are diagrams showing a configuration of controlling the elongation of a thick plate using the constraining roll of the present invention
12A and 12B are diagrams showing a hot-wire calibrator having a diameter roll of the present invention
Figs. 13A to 13E are schematic diagrams showing a state of heavy plate calibration through a two-
14A to 14B are diagrams showing the monitoring means provided in the hot-

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described (with reference to the accompanying drawings). However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. (The shape and size of elements in the drawings may be exaggerated for clarity.)

5B and 6 illustrate an apparatus for manufacturing a thick plate and a related process according to the present invention.

5A and 6, the apparatus for manufacturing a thick plate according to the present invention basically comprises an extruder 200 and a longitudinal extruder 300 for rolling a material passed through a heating furnace 100, An accelerating cooler 500 for cooling the thickened plate 1 and a hot calibrator 600 for calibrating the cooled thick plate and more preferably a preliminary calibrator 400 provided between the longitudinal end mill and the accelerator cooler, .

Particularly, the thick plate manufacturing apparatus 1 of the present invention comprises a plate flatness gauge 80 provided on the exit side of the accelerating cooler, which is connected to the accelerating cooler, the longitudinal rolling mill and / or the preliminary calibrator, (Flatness measuring device).

Therefore, as shown in Fig. 7, the thick plate manufacturing process of the present invention is characterized in that the step of thickening and longitudinally rolling the heated material sequentially and / or the step of accelerating the rolled heavy plate and the step of calibrating the cooled heavy plate And a hot calibration step.

Particularly, in the present invention, after the accelerated cooling step, the flatness of the thick plate is measured using the flatness meter 80, the preliminary calibration, acceleration cooling and rolling conditions are fed back from the flatness measurement value, And a control step of

As a result, as shown in FIGS. 5A, 6, and 7, the present invention is characterized in that the material extracted from the heating furnace is manufactured as a thick plate 1 through the basic manufacturing steps of the thick plate. After the accelerated cooling, the flatness of the thick plate is measured through the flatness meter 80, and the measured flatness of the thick plate is fed back to the rolling condition, the preliminary calibration condition and the accelerated cooling condition of the longitudinal rolling, And at the same time, the hot calibration is fed forward to control the hot calibration.

This is because the measured value is used only as a limited process or control factor by measuring the flatness of the thick plate at the exit side of the rolling mill or the outflow side of the hot plate as described in FIGS. 2A and 2B or FIG. 4, The flatness of the thick plate is precisely controlled, and in particular, the flatness of the plate is taken into consideration as a factor in each process of rolling, preliminary calibration, accelerated cooling and subsequent hot calibration It is possible to secure an optimum level of flatness without plate deformation of the thick plate by appropriately removing the residual stress during the production of the thick plate.

That is, as shown in FIG. 5B and FIG. 6 to FIG. 7, in the process of manufacturing a thick plate according to the present invention, the state of the thick plate (defect, plate strain) , Rolling, accelerated cooling, and the like, thereby making it possible to eliminate the existing processes.

For example, FIG. 5A shows a general thick plate manufacturing step without using a conventional flatness meter. Particularly, in contrast to FIGS. 5A and 5B, in the present invention, the on-line calibrator 800 and the cold Even if the step of the calibrator 900 is removed, it is possible to produce a product having excellent flatness quality of the thick plate.

In addition, as shown in FIG. 5B, it is also possible to exclude the preliminary calibrator 400 with an optimal control implementation.

As a result, the present invention makes it possible to eliminate existing manufacturing steps, thereby providing an effective advantage in terms of overall facility construction and cost.

Although not shown in the drawings, the flatness meter 80 of the present invention includes a longitudinal mill 300, a preliminary calibrator 400, an accelerating cooler 500, a hot calibrator 600, It is of course also possible that they are fed-back and feed-forward controlled from the associated flatness measurements.

For example, in the production of a thick plate, since the flatness meter 80 is disposed on the exit side of the accelerating cooler where sheet distortion easily occurs and about two-thirds of the entire process proceeds, the optimal position, that is, So that it is possible to manufacture an optimum thick plate.

Next, as shown in FIGS. 5B, 6, and 7, the apparatus for manufacturing thick plates of the present invention includes at least one of the outgoing side of the preliminary calibrator 400, the side of the hot calibrator 600, And constraining rolls 90 provided in the preliminary calibrator 400 and the hot calibrator 600 in cooperation with the calibrating rolls of the preliminary calibrator 400 and the hot calibrator 600 so as to further secure the flatness through the elongation control of the thick plate.

5B, the restraining roll 90 provided on the exit side of the preliminary calibrator 400 may be one or more pinch rolls provided to process the stay water or the like in the accelerating cooler 500. As shown in FIG.

Therefore, when the thick plate of the present invention is preliminarily calibrated or hot-calibrated at the time of manufacturing the thick plate of the present invention, the leading edge of the thick plate is engaged with the constraining roll 90 and a speed difference is generated between the roll of the preliminary calibrator and the roll of the hot- The restraining rolls stretch the thick plate to improve the flatness of the thick plate.

Meanwhile, although schematically shown in the drawing, an upper confining roll of the confining rolls 90 may be provided so as to be movable up and down for roll gap control.

At this time, as shown in FIGS. 6 and 7, the restraining roll 90 can be controlled to operate under the control condition while feedback and feed forward from the flatness measurement value measured in the flatness meter 80.

11A to 11C show details of the thick plate stretching control of the constraining roll 90 of the present invention.

11A, the constraining rolls 90 of the present invention are provided with upper and lower constraining rolls 92 and 94, and such constraining rolls 90 of the present invention as shown in FIG. 500 so as to function as a dam function.

Of course, the upper restraining rolls of the upper and lower restraining rolls are provided so as to be movable up and down to implement the roll gap control corresponding to the thickness of the thick plate 1. [

For example, as shown in FIGS. 11A and 11C, the restraining rolls 90 disposed at the outgoing side of the preliminary calibrator 400 and at least outwardly of the inlet side and the outlet side of the hot calibrator 600 have a leading end passing through the preliminary and hot calibrator If the speed of the restraining roll is increased, the stretching is locally generated in the longitudinal direction at the portion where the restraining roll is pulled out. If the restraining roll is sustained for a predetermined time, the plate shape of the heavy plate is also improved.

That is, at least one of the upper confining roll 92 and the lower confining roll 94 can apply a reduction amount to the thick plate 1 passing by the cylinder (not shown) that is moved in the upward and downward directions, When the rotational speed of the restraining roll is increased in the state where the restraining roll is applied, a tensile force is applied to the backing plate 1 due to the difference in moving speed between the calibrating roll and the restraining roll, Can be improved.

On the other hand, when the constraining roll 90 of the present invention is provided as pinch rolls of the accelerator cooler, as shown in FIG. 11B, plate deformation of the thick plate entering the accelerating cooler at least by upward or downward movement of the upper constraining roll, If this happens, it will be forcibly pressed down to enable the flatness improvement of the thick plate during subsequent hot rolling.

However, in the case of the constraining roll 90 disposed at the entrance of the hot-wire straightening machine 600, since the tip is inserted into the straightening roll on the hot-wire straightening machine side, the rotation speed of the first straightening machine is increased to perform the drawing of the thickening plate.

Next, in FIGS. 12 to 14, there is shown a hot plate calibrating device for hot plate hot plate in the apparatus and process for producing a thick plate according to the present invention shown in FIGS. 5B and 6, May be provided as a two-roll calibrator including other calibrating rolls 630 and 650 (hereinafter referred to as " calender rolls ").

That is, Figs. 12A and 12B show the construction of a hot-wire calibrator including two rolls.

For example, in the case of a calibrated roll of the present invention, that is, a hot calibrator 600 based on the caliper rolls 630 and 650, in the case of a thin plate having a thickness of 15 t or less, It is preferable to use a calibrating roll having a large caliber roll because it is possible to apply a small calibrating roll from the mouth roll of the calibrator as far as possible and conversely if the caliper is large, .

On the other hand, as shown in Figs. 12A and 12B, the plate plate straightening apparatus 1 according to the present invention has, for example, a plate frame 610 having different diameters D whose diameters increase from the entrance side to the exit side, And a plurality of upper and lower calibrating rolls 630 and 650 provided so as to be movable upward and downward to control the thick plate 1 and to be calibrated.

These upper and lower calibrating rolls 630 and 650 may more specifically include actuators 632 and 652 installed in the apparatus frame 610 such as a vertically moving bearing block 634 A roll shaft (not shown) is connected between the roll chocks 654 (roll chocks) so that the movement of the bearing blocks is adjusted according to the operation (forward or backward) of the actuator and the roll gap through the calibrated rolls is adjusted will be.

Next, in Figs. 13A to 13E, a hot plate 600 having a two-roll type roll according to the present invention is manufactured in the following manner. In the hot plate 600, a thick plate, that is, a thin plate having a thickness of 15 t or less, a thick material having a thickness of about 15-40 t, Rolls 630 and 650 are arranged in various patterns.

In FIG. 13, the rolls for performing the calibration are denoted by "X" and the rolls for which no correction is performed are denoted by "Y".

That is, as shown in FIGS. 13A and 13B, by using the entirety of the minor calibrating rolls 630 and 650 in the case of the blank material 1a, or by using the minor calibrating rolls 630 and 650 on the apparatus- Selectively group and correct.

Alternatively, as shown in FIG. 13C, in the case of the heavy material 1b, calibrations can be performed using the central side calibrating rollers, except for the inlet and outlet calibrating rolls.

Alternatively, as shown in FIGS. 13D and 13E, in the case of the post material 1c, the exit calibrating rolls 630 and 550 of the apparatus may be used, or the calibrating rolls may be sequentially used, Can be calibrated.

14A to 14B show a calibrator including the sensing means 670, particularly in the hot calibrator 600 having the caliper roll according to the present invention.

That is, in the calibrator of the present invention, the sensing means 670 is disposed on the lower portion of the first and second moving means 680 and 690 provided to the apparatus frame 610 so as to be movable in the length and width direction of the thick plate 1 And is provided to detect the alignment state of the calibrating rolls 630 and 650 and the internal environment of the apparatus, that is, the adherence of the foreign matter to the roll.

For example, as shown in FIG. 13, in the case of the hot-wire calibrator 600 having a diameter roll of the present invention, the calibrating rolls are selectively grouped corresponding to the thin material, the heavy material, and the post material, When the calibrator is set, the alignment state of the calibrating rolls must be precise, and the sensing means 670 of the present invention senses whether the alignment of such calibrating rolls is precisely set.

14, the first moving means 680 includes a screw bar 684 provided in the apparatus frame 610 to be driven as a motor 682 in the longitudinal direction of the calibrator (in the advancing direction of the thick plate) And the first moving body 686, i.e., the moving block, can move in the longitudinal direction of the apparatus when the motor 682 is operated.

The second moving means 690 includes a second moving body 684 connected to the lower portion of the feeding roller 694 moving along the rail 692 provided in the lower portion of the first moving body 686 and extending in the apparatus width direction The feeding roller 694 is connected to the motor 698 such that the feeding roller 694 is connected to the second moving body in a horizontal state so that when the motor is driven, the feeding roller rotates about the rails of the rails of the H- And the feeding roller (idle moving roller) on the opposite side is also moved in association with the second moving body.

Accordingly, the second moving body, that is, the second moving body 696, which is a box structure, can be moved in the width direction of the apparatus, and the sensing means 670 is mounted on the second moving body 696, The first and second moving bodies 686 and 696 are moved in the longitudinal direction and the width direction of the apparatus so that the entire internal area of the apparatus can be moved do.

At this time, the sensing means 670 includes a sensor 672 vertically mounted on the second moving body 696 toward the roll, for example, a distance sensor, and the like. The rollers on both sides of the calibrating rolls are assembled, A sensing rod can be connected between the sensing block 674 and the bearing block 634, 654, for example.

Accordingly, since the height of the bearing block results in the arrangement position of the calibrating rollers, the sensor 672 senses the sensor rollers in order in the longitudinal direction of the apparatus, at which time the setting height of the calibrating rolls is sensed, It can be judged whether it is precisely set.

In addition, the sensing means 670 may further include a camera 676 provided on the second moving body 696 of the second moving means.

As described above, according to the movement of the first and second moving bodies, the camera 76 moves in a straight up position on the rolls, thereby realizing the internal environment of the apparatus, that is, And to facilitate maintenance and maintenance of the device.

14 shows that the sensing means 670 is disposed on the side of the upper calibrating roll 630. It is also possible to provide the sensing means and the first and second moving means 680 and 690 on the lower calibrating roll 650 side It is possible.

Therefore, in the present invention, the width and thickness rolling mill 200, the longitudinal mill 300, the preliminary calibrator 400, the accelerating cooler 500 and the diameter rollers 630 and 650 Based on a hot plate calorimeter 600 based on the hot plate calorimeter 600, and further provided with a plate flatness meter 80 provided on the exit side of the accelerating cooler, A thick plate is manufactured through a plate-restraining roll 90 provided at the entrance and exit of the hot-wire calibrator.

That is, the heated material is successively subjected to widthwise extrusion and longitudinal extrusion, preliminarily calibrated rolled heavy plates, accelerated cooling the heavy plates, finally hot-calibrating, and then transferring the heavy plate products to the cooling stand 700.

More preferably, at the time of manufacturing the thick plate of the present invention, the tip of the thick plate 1, which is calibrated at the time of preliminary calibration and hot calibration, is set as a constraining roll 90 having a speed difference between the preliminary calibration roll and the hot calibration roll It is possible to add stretching.

The present invention is characterized in that, in the manufacture of a thick plate, the flatness of a thick plate is measured by a flatness meter (80) after accelerated cooling, and the cooling, preliminary calibration, rolling and constraining roll control conditions are fed back from the flatness measurement values, Feed forward to ensure the flatness of the thick plate in the optimum control environment.

Next, as shown in FIGS. 9 and 10, the flatness meter 80, which preferably provides measurement values as control factors in various thick plate manufacturing processes, utilizes a flatness defect element simulator 80 ' So that the measurement bonding property is evaluated in advance, and the flatness measurement can be performed optimally.

For example, the preliminary measurement of the simulation apparatus for evaluating the measurement consistency of such a flatness meter 80 is performed by measuring the conformity of the flatness meter in real time and performing precise control when setting the rolling, cooling, and calibration .

That is, as shown in Figs. 9A and 9B. The flatness meter 80 measures the pitch P and the height H of the flatness degree by using the flatness meter 100 when the flat plate 1 is flat and the flatness meter 80 measures the flatness P of the flatness meter 100 through the laser beam 82 L or a point laser is projected on the surface of the plate from the top of the thick plate 1 and the defect of the shape of the plate is photographed by the camera 84. The flatness data is processed through data signal processing to obtain the flatness of the thick plate 1 Can be quantitatively measured.

At this time. FIG. 9B shows various defective elements formed in the thick plate after rolling, preliminary calibration, accelerated cooling or hot calibration in the production of the actual thick plate. The upward bending portion UB or the upward bent portion UB at the front end or the rear end A downward bending portion DB is generated, where PL is a pass line.

Therefore, when the leading end or the end moves in the upward or downward bending state, vibration occurs due to contact with the conveying roll R, and it is difficult to perform normal measurement through the flatness meter 80 when such vibration occurs, Or on the upper surface of the thick plate 1 subjected to the accelerated cooling, a retentive water causing irregular reflection of the laser is generated. Such a retentive number causes the laser L to scatter and be irregularly reflected.

When the edge wave EW occurs due to the elongation deviation at the end portion of the thick plate in the longitudinal direction of the thick plate after rolling or cooling of the thick plate as shown in Figs. 3A, 3B and 9C, and elongation deviation occurs in the central portion A center wave (CW) is generated.

Therefore, in the case of measuring the flatness of the thick plate using the flatness meter 80 of the present invention shown in FIGS. 5B and 6, as described above, various bad factors are generated when rolling, cooling or calibrating the thick plate , It is necessary to secure measurement consistency.

In the present invention, before measuring the flatness of the thick plate 80 using the flatness meter 80, the flatness degree 80 is firstly measured by using the flatness bad factor simulator 80 ' (80) can be evaluated.

For example, as shown in FIG. 10B. Corresponding to the structure (form) of the various simulation means described below, flatness corrugation occurs when the flatness meter 100 is measured. When the flatness meter has consistency, the flatness is accurately measured corresponding to the longitudinal direction of the base member 10. However, when the flatness meter is inconsistent, the flatness is measured to be large or small in correspondence with the longitudinal direction of the plate , And in the case of miscorrection in contrast to the flatness with consistency, it indicates the deviation.

Hereinafter, various types of simulation means included in the flatness deficiency element simulation apparatus 80 'of the thick plate of the present invention will be described.

First, as shown in FIG. 10A, the flatness defect element simulating apparatus 80 'of the thick plate of the present invention has a height difference or length (length) along at least one of the center and the edge in the longitudinal direction of the movable base member 10, (20) comprising a plurality of bar structures (22) provided to have a car.

Thus, the bar structures 22 of the wave simulation means 20 simulate an edge wave EW and a center wave CW generated in a thick plate after rolling or cooling of the heavy plate.

That is, at least one of the center and the edge in the longitudinal direction of the base member 10, preferably the center of the base member 10, is partly centered and the remaining part has a height difference or length difference along the edge And arranging a plurality of bar structures 22.

Therefore, the edge wave (EW) generated after rolling or accelerated cooling of the thick plate and the center wave (CW) are most closely simulated.

As a result, since the rod structures 22 of the wave simulation means 20 of the present invention are provided on the base member 10 in a regular pattern, the edge wave or center wave generated from the thick plate during rolling or accelerated cooling And can eventually provide sufficient measurement consistency of the flatness gauge in the measurement of the simulation means through the flatness gauge 80.

Next, as shown in Figs. 10C and 10D. The flatness defects element replicas 80 'of the plate material according to the present invention can be applied to a deformation element simulation means 30 of a thick plate provided to simulate various deformation elements of a thick plate generated from a thick plate after rolling, For example, formed of a triangular section 31, a wavy (sinusoidal waveform) 32, a trapezoid 33, a sphere 34 and a quadrangle 35, And is provided with a height difference.

Therefore, the flatness can be evaluated differently according to the jigs during the measurement through the flatness meter 100. For example, in the case of the wave-type jig (sine wave jig) 32, the area scanned by the laser beam 82 from the laser beam 82 is not large. In contrast, in the case of the rectangular jig 35, All can be reflected.

Therefore, various types of paper are provided to fully reflect the deformation elements of the plate, and can sufficiently reflect various deformations that may occur in the plate through the jigs of these deformation element simulation means.

Next, as shown in Fig. 10C, the flatness deficiency element replicating apparatus 80 'of the thick plate of the present invention is a flat element defect replicating apparatus of the present invention, in which the bending elements generated in the thick plate during rolling, The bending element simulating means 40 includes a first curved plate 42 curved in the width direction of the base member 10 and a second curved plate 42 curved in the longitudinal direction of the base member 10, And a second curved plate (44).

For example, the first and second curved plates 42 and 44 may be provided so as to be welded on the base member 10 and to simulate the C-curvature and the L-curvature generated in actual thick plate manufacture .

Next, as shown in Figs. 10A and 10C. The flatness deficiency element simulation apparatus 80 'of the present invention includes a vibration generation simulation means 50 provided to simulate a vibration element generated in a thick plate after hot-calibrating the rolling and accelerating cooling of a thick plate, 9B, the bending portion UB at the front end of the thick plate 50 is vibrated (moved) while colliding with the transport roll, as described in FIG. 9B.

The vibration generating simulation means 50 is provided on at least one of the tip end and the distal end of the base member 10 so as to be oscillatable via the elastic body 52 And the lower end includes a flow plate 54 (not shown) hinged to the base member.

Therefore, when the base member 10 is moved through the actual feed rolls, the flow plate is moved up and down due to the elastic body upon contact with the feed roll, thereby sufficiently simulating the occurrence of the vibration when the bending portion is generated.

Next, as shown in FIG. 10A, the flatness deficiency element simulation apparatus 80 'of the present invention calculates the number of retention W that is generated on the upper surface during cooling of the thick plate and causes uneven cooling on the upper and lower surfaces of the thick plate And a water receiving portion 60 provided for simulation.

The water retention portion 60 is a structure that is elongated in the width direction of the base member 10 and can be filled with water W because the normal retention water is formed while spreading on the upper surface of the thick plate.

The laser L is scattered in nature when it collides with the water W and thus allows sufficient quantitative simulation of the flatness gauge 80 in view of the case where retentate water is generated will be. That is, the water receiving means 60 for simulating the stay water of the present invention is capable of simulating an environment in which the laser L of the flatness meter 80 is scattered when it collides with water.

10A, the flatness defect factor simulating apparatus 80 'of the present invention is provided on at least one of a front end and a rear end of the base member 10 to provide a bending portion generated at the time of rolling or calibrating a thick plate And may be provided with a bending plate in the shape of a trapezoid attached to at least one of the leading end and the distal end of the base member 10, preferably to the base member.

Therefore, the bending part simulation means 70 provided as the bending portion of the present invention of the downward bending portion simulates the phenomenon in which the transfer roll and the bending portion simulation means collide with each other when the base member is moved.

Accordingly, in the case of the flatness defective element simulation apparatus 80 'of the thick plate of the present invention described above with reference to FIGS. 10A to 10D, various various forms So that it is possible to judge (evaluate) the measurement consistency of the flatness meter 80 at the time of manufacturing the actual thick plate.

Next, as shown in FIGS. 8A and 8B, flatness control technology that links the rolling mill 300, the accelerating cooler 500, and the hot straightener 600 at the time of producing the thick plate of the present invention I can secure it. For example, in FIG. 8A, when a flat plate is passed through the accelerating cooler 500 in the rolling mill 300 to generate C-curves, C-curves are generated even after the hot calibration. However, It is possible to prevent the C-curves from being formed in the thick plate passing through the accelerating cooler 500 and to ensure the flatness of the thick plate through the steel hot correction, The residual stress is also improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.

1 .... Plate 10 .... Base member of the simulator
20 .... wave simulating means 30 .... deforming element simulating means
40 .... bending element simulating means 50 .... vibration generating simulating means
60 .... Water receiving means 70 .... Bending simulation means
80 .... flatness meter 90 .... constraining roll
200 ... width extruder 300 .... length extruder
400 .... Preliminary Calibrator 500 .... Accelerated Cooler
600 .... Hot calibrator 630,650 .... Calibration roll of low caliber
670 .... Detecting means 680, 690 .... First and second moving means

Claims (13)

An accelerating cooler for cooling the rolled heavy plate; a hot calibrator for calibrating the cooled heavy plate; and an accelerating cooler connected to the hot cooler via a rolling mill, a hot calibrator and a control unit And a flatness meter provided on the exit side of the accelerator cooler for measuring the flat plate flatness,
Further comprising a preliminary calibrator provided on an exit side of the longitudinal end mill, wherein the preliminary calibrator is connected to the flatness meter via a control unit. delete The method according to claim 1,
An output of the preliminary calibrator; And
At least one of an inlet side and an outlet side of the hot air straightener;
A restraining roll provided on at least one of the pair of rollers and provided to stretch the thick plate in cooperation with the calibrating rolls;
Wherein the restraining roll is connected to the flatness meter via a control unit. The method of claim 3,
Wherein the constraining rolls on the side of the preliminary calibrator are provided as one or more pinch rolls provided in the accelerating cooler. The method according to claim 1,
The hot calibrator may include a diameter roll having different diameters;
And a plurality of plate-like members. 6. The method of claim 5,
The hot calibrator includes: sensing means for sensing alignment of the thin rollers;
Further comprising: a plurality of plate-shaped members, The method according to claim 6,
The sensing means is provided on the lower part of the first and second moving means provided movably in the longitudinal direction and width direction on the apparatus frame of the calibrator,
Wherein the sensing means includes a sensor associated with the second moving means and a sensor sensing body connected between the bearing blocks of the calibrating roll to sense roll alignment. A step of successively extruding and extruding the heated material, and a step of accelerating cooling the rolled heavy plate; And a hot calibration step of calibrating the cooled thick plate,
Measuring the flatness of the thick plate after the accelerated cooling step using a flatness meter, feeding back the cooling and rolling conditions from the measured flatness measurement values and feeding forward the hot calibration conditions;
Further comprising the steps of: 9. The method of claim 8,
Pre-calibrating the thick plate after rolling;
Wherein the calibration condition of the preliminary calibration step is fed back from the flatness measurement of the thick plate measured by the flatness meter. 10. The method of claim 9,
Stretching the leading edge or trailing edge of the preliminarily or thermally calibrated heavy plate as a restraining roll having a speed difference from the calibrating roll;
Wherein the constraining roll condition of the step of stretching as the constraining roll is feedback or feed forward from the flatness measurement value measured by the flatness meter after accelerated cooling. 11. The method according to any one of claims 8 to 10,
Wherein the flatness gauge is evaluated beforehand by using a flatness defect factor simulator of a thick plate. 12. The method of claim 11,
The flatness defect element modeling device of the thick plate,
A wave simulating means comprising a plurality of bar structures provided to have a height difference or a length difference along at least one of a center and an edge in the longitudinal direction of the base member to be moved;
Deformation element simulating means comprising jigs formed of at least one of a triangular section, a sinusoidal section, a trapezoid, a sphere and a rectangle and provided with a length or height difference on a base member; And
A bending element simulating means having at least one of a first curved plate provided in the width direction of the base member and a second curved plate provided in the longitudinal direction of the base member;
The method comprising the steps of: 12. The method of claim 11,
The flat plate defect element simulation apparatus of the thick plate includes vibration generating simulating means provided on at least one of a distal end and a distal end of the base member and including a flow plate provided so as to be capable of upward and downward flow through an elastic body;
Water receiving means provided in at least one point of the base member and provided in a water receptacle filled with water W provided in the width direction of the base member and corresponding to the number of retention; And
A bending simulator provided in a bending plate attached to at least one of a distal end and a distal end of the base member;
The method comprising the steps of:

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