JP2014231089A - Apparatus and method for reforming steel plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel plate reforming apparatus and a steel plate reforming method which are capable of obtaining sufficient reformation effect.SOLUTION: A steel plate reforming apparatus 1 includes: a shape measuring device 3 to measure a maximum steepness of a steel plate 2 prior to reformation; a plurality of levering roll groups 4 to 6 that are capable of applying tensile force to the steel plate 2 by individually setting circumferential speeds; and a control section 7 that sets the circumferential speeds of the plurality of leveling roll groups 4 to 6 on the basis of the maximum steepness of the steel plate 2 prior to reformation.

Description

  The present invention relates to a steel plate straightening device and a steel plate straightening method.

  Metal plates including steel plates are manufactured through various manufacturing processes such as a hot rolling process and a cold rolling process. Among these manufacturing processes, shape defects are likely to occur, particularly in the rolling process or the cooling process after rolling or heat treatment, and the steel sheet is corrected to ensure the flatness of the product.

  Among various straightening devices, the roller leveler is highly productive because it can continuously straighten steel plates, and has become a mainstream facility in the straightening process at large steel plate factories. When correcting steel plates with a roller leveler, arrange multiple leveling rolls in a staggered manner, adjust the roll spacing on the steel plate biting side to the indentation tendency based on the workpiece thickness, and then rotate the leveling roll and transport roll Then, the workpiece is drawn into the roller leveler, and correction is performed by applying bending to the workpiece.

  At this time, a plastic deformation region and an elastic deformation region due to tensile or compressive stress coexist on the inner surface of the workpiece by bending between the rolls. The factor that determines the ratio between the elastic deformation region and the plastic deformation region (plastic deformation rate) is the roll indentation amount. According to Patent Document 1, a flat steel plate is obtained by correcting the plastic deformation rate at a rate of about 80 to 85%. It is said that you can get.

  Among the thick steel plates, for example, a steel plate having a thickness of 10 mm or less is likely to have a shape defect in the rolling process. In order to ensure a plastic deformation rate of 85% in the straightening of such a steel sheet, it is necessary to increase the amount of pressing on the steel sheet entry side. However, there is an upper limit to the maximum push amount of the roll due to mechanical restrictions such as the leveling roll diameter and the roll interval. For this reason, in a steel plate having a thickness of 10 mm or less, there are cases where bending that satisfies the required plastic deformation rate cannot be applied.

  Further, as the roll push-in amount increases, a passage obstacle when the work material bites into the first leveling roll increases, so that there is a limit to improving the correction effect only by increasing the roll push-in amount.

  On the other hand, it is known that torque circulation occurs when load is concentrated on a specific roll among several leveling rolls when straightening a steel sheet. As a countermeasure against this torque circulation, a roller leveler with multiple drive sections has been developed. ing. In this roller leveler, the main purpose is to reduce the load by dividing the drive system. Therefore, the peripheral speed of the leveling roll in each drive section is usually controlled to be the same.

  On the other hand, Patent Documents 2 to 4 disclose correction devices having a plurality of drive sections, and examples in which a difference is made in the peripheral speed of the leveling roll for each drive section.

  More specifically, in Patent Document 2, a plurality of rolls are grouped, and the peripheral speed of the upstream group roll is smaller than the peripheral speed of the downstream group roll with respect to the material traveling direction. Examples have been disclosed.

  In Patent Document 3, a plurality of leveling rolls are divided into two or more groups, the axial force generated between each group is detected, and the peripheral speed of the roll is set so that the detected value becomes a predetermined axial force. A method of adjusting is disclosed.

  Further, in Patent Document 4, when a plurality of leveling rolls are divided into two or more groups and the speed of each group is controlled by an individual drive motor, the correction of the drive motor is being performed with reference to one of the drive motors. A method is disclosed for controlling the difference between the remaining power and the total power of the remaining drive motor to a predetermined value.

JP 2004-283878 A JP 58-84614 A JP-A-60-223615 JP-A-1-317620

  However, in Patent Documents 2 to 4, no consideration is given to the shape of the material when making a difference in the peripheral speed of the roll, and it is also disclosed how much the difference in the peripheral speed is specifically determined. It has not been.

  In addition, when making a difference in the circumferential speed of each roll in the roller leveler, it is necessary to set the circumferential speed difference so that the steel sheet does not slip with respect to each roll. However, the operator tends to set the peripheral speed difference between rolls to a low value because the operator tries to prevent the steel sheet from slipping. Sometimes it was not set.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a steel plate straightening device and a steel plate straightening method capable of obtaining a sufficient straightening effect.

  As a result of intensive studies by the present inventors to solve the above-mentioned problems, the correction condition of the steel sheet is determined from the shape profile data of the steel sheet measured by the shape measuring instrument, and the peripheral speed of the leveling roll connected to the plurality of electric motors. By providing a difference for each drive unit, the present inventors have found that correction is performed while applying tension to the steel sheet using the frictional force generated between the leveling roll and the steel sheet. That is, in the present invention, based on the shape profile data of the steel sheet measured by the shape measuring instrument, a speed instruction is given for each of the drive sections divided into a plurality in the roll unit, and the tension is applied to the workpiece at the boundary of the roll drive section. Correction is performed in a state where is added.

[1] A shape measuring instrument for measuring the maximum steepness of a steel sheet before straightening;
A plurality of leveling roll groups capable of imparting tension to the steel sheet by individually setting the peripheral speed;
Based on the maximum steepness of the steel sheet before straightening, a control unit that sets each peripheral speed of the plurality of leveling roll groups,
A steel sheet straightening device comprising:
[2] The steel sheet according to claim 1, wherein the control unit sets the peripheral speed of the plurality of leveling roll groups so as to increase from the entering side to the exit side in the conveying direction of the steel sheet. Straightening device.
[3] When the steel plate is passed through the leveling roll group a plurality of times, the control unit determines the circumferential speed of the plurality of leveling roll groups at least during the first passage. The steel sheet straightening device according to claim 1, wherein the steel sheet straightening device is set so as to increase from the entrance side to the exit side.
[4] The steel sheet straightening device according to claim 3, wherein the controller sets the peripheral speeds of the plurality of leveling roll groups to be the same during the second and subsequent passes.
[5] When the steel sheet is passed through the leveling roll group a plurality of times, the control unit determines the peripheral speed of the plurality of leveling roll groups at the time of all passages. The steel sheet straightening device according to claim 1, wherein the steel sheet straightening device is set so as to increase from the entrance side to the exit side.
[6] A method of correcting a steel sheet by a plurality of leveling roll groups capable of imparting tension to the steel sheet by individually setting a peripheral speed,
Measuring the maximum steepness of the steel sheet before straightening;
Based on the maximum steepness of the steel sheet before straightening, setting the peripheral speed of each of the plurality of leveling roll groups, and correcting the steel sheet with the plurality of leveling roll groups;
A method for correcting a steel sheet, comprising:
[7] The method for correcting a steel sheet according to claim 6, wherein the circumferential speed of the plurality of leveling roll groups is set so as to increase from the entrance side to the exit side of the transport direction of the steel sheet.
[8] When the steel plate is passed through the leveling roll group a plurality of times, the circumferential speed of each of the plurality of leveling roll groups at the time of the first passage is entered on the conveyance direction entrance side of the steel plate. The steel sheet straightening method according to claim 6, wherein the steel sheet is set so as to increase toward the exit side.
[9] The steel sheet straightening method according to claim 8, wherein the peripheral speeds of the plurality of leveling roll groups are set to be the same during the second and subsequent passes.
[10] When the steel sheet is passed through the leveling roll group a plurality of times, the circumferential speed of each of the plurality of leveling roll groups is determined from the entering side in the conveying direction of the steel sheet during all passages. The steel sheet straightening method according to claim 6 or 7, wherein the steel sheet is set to increase toward the exit side.

According to the steel sheet straightening apparatus of the present invention, the maximum steepness of the steel sheet before straightening is measured by the shape measuring instrument, and the peripheral speed of each of the plurality of leveling roll groups based on the maximum steepness of the steel sheet before straightening by the control unit. Therefore, the tension applied to the steel sheet can be appropriately set according to the maximum steepness, and the correction of the steel sheet by the bending back deformation by the plurality of leveling roll groups can be surely executed.
Further, according to the steel sheet straightening device of the present invention, the control unit sets the peripheral speed of the plurality of leveling roll groups so as to increase from the entrance side to the exit side of the steel sheet, so that bending back by the leveling roll group is performed. Tension can be reliably applied to a deformed steel sheet, and the steel sheet can be reliably corrected.
Further, according to the steel sheet straightening device of the present invention, when the steel plate is passed through the leveling roll group a plurality of times, the control unit is at least at the first pass, the peripheral speed of the plurality of leveling roll groups. Is set so as to increase from the entry side to the exit side of the steel plate, so that an appropriate tension can be applied to the steel plate that has just been measured and has not been corrected.
Furthermore, according to the steel sheet straightening device of the present invention, the peripheral speeds of the plurality of leveling roll groups are set to be the same during the second and subsequent passes, so that when the maximum steepness of the steel sheet is relatively small, 2 The steel sheet can be corrected only by bending back deformation at the time of passing after the first time, and there is no possibility that the steel sheet is excessively corrected.
Further, according to the steel sheet straightening device of the present invention, since the peripheral speed of the plurality of leveling roll groups is set to increase from the entry side to the exit side of the steel sheet at the time of all passage of the steel sheet, the steel plate When the maximum steepness is relatively large, it is possible to apply tension to the steel plate that is being bent back and deformed during all passes, and the steel plate can be reliably corrected.

Further, according to the steel sheet straightening method of the present invention, the maximum steepness of the steel sheet before straightening is measured, and the respective peripheral speeds of the plurality of leveling roll groups are set based on the maximum steepness of the steel sheet before straightening. The tension applied to the steel sheet can be appropriately set according to the maximum steepness, and the correction of the steel sheet by the bending back deformation by the plurality of leveling roll groups can be surely executed.
In addition, according to the steel sheet straightening method of the present invention, since the peripheral speed of the plurality of leveling roll groups is set to increase from the entry side to the exit side of the steel sheet, bending back deformation is made by the leveling roll group. It is possible to reliably apply tension to the existing steel sheet and to reliably correct the steel sheet.
Furthermore, according to the steel sheet straightening method of the present invention, when the steel sheet is passed through the leveling roll group a plurality of times, the peripheral speed of the plurality of leveling roll groups is set to the level of the steel sheet at least during the first passage. Since it is set to increase from the side toward the exit side, an appropriate tension can be applied to the steel sheet that has just been measured and has not been corrected.
Furthermore, according to the steel sheet straightening method of the present invention, the peripheral speeds of the plurality of leveling roll groups are set to be the same during the second and subsequent passes, so that when the maximum steepness of the steel sheet is relatively small, 2 The steel sheet can be corrected only by bending back deformation at the time of passing after the first time, and there is no possibility that the steel sheet is excessively corrected.
Further, according to the steel sheet straightening method of the present invention, since the peripheral speed of the plurality of leveling roll groups is set to increase from the entry side to the exit side of the steel sheet during the passage of all of the steel sheet, the steel plate When the maximum steepness is relatively large, it is possible to apply tension to the steel plate that is being bent back and deformed at all passages, and the steel plate can be reliably corrected.

FIG. 1 is a schematic side view showing a correction apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram illustrating the steepness of the steel plate. FIG. 3 is a flowchart for explaining a steel sheet straightening method according to an embodiment of the present invention. FIG. 4 is a schematic diagram illustrating a setting table for the peripheral speed of the leveling roll group provided in the control unit of the correction apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the drawings used in the following description may schematically show the features for convenience in order to make the features easy to understand, and the dimensional ratios of the respective components are not always the same as the actual ones.

  The steel sheet straightening device 1 according to the present embodiment is intended to straighten the shape of the steel sheet 2 and to reduce the internal residual stress of the steel sheet 2 by repeatedly bending the steel sheet 2 as a workpiece.

  Specifically, the straightening device 1 shown in FIG. 1 includes a shape measuring device 3 that measures the maximum steepness of the steel plate 2, a plurality of leveling roll groups 4, 5, and 6, and each leveling roll group based on the maximum steepness. And a control unit 7 for setting peripheral speeds of 4, 5, and 6. A plurality of leveling roll groups 4 to 6 constitute a roll unit 8. The roll unit 8 is provided with a plurality of leveling rolls 11 to 19 that perform bending back processing on the steel sheet 2 by lowering the steel sheet 2 from above and below, and the adjacent leveling rolls 11 to 19 are grouped to form a leveling roll group. 4 to 6 are configured.

  Further, in the correction device 1 shown in FIG. 1, a reduction device 21 that adjusts the pressing amount of each leveling roll 11 to 19, a reduction control unit 22 that controls the reduction device 21, and a drive that drives the leveling rolls 11 to 19. The unit 23, a drive control unit 24 that controls the drive unit 23, and transport rolls 25 and 26 that transport the steel plate 2 to the roll unit 8 are provided. The drive unit 23 includes a plurality of electric motors 31 to 35 and a plurality of speed reducers 41 to 45 so that the leveling rolls 11 to 19 can be driven for each of the leveling roll groups 4 to 6 by the electric motors 31 to 35. It has become.

  The shape measuring instrument 3 is installed on the conveyance path of the steel plate 2 in front of the roll unit 8. In FIG. 1, the shape measuring instrument 3 is installed on the left side of the roll unit 8 in the drawing. The shape measuring instrument 3 measures the wave height and the warp height existing in the steel plate 2. In addition, the shape measuring instrument 3 analyzes the measurement data, calculates the steepness from the wave height and wave pitch in the steel plate 2, and further calculates the maximum steepness of the steel plate 2. The shape measuring device 3 is connected to the control unit 7 and configured to output measurement data, steepness, and maximum circumferential agility measured by the shape measuring device 3 to the control unit 7.

  The control part 7 sets each peripheral speed of the several leveling roll groups 4-6 based on the maximum steepness of the steel plate 2 before correction. The control unit 7 stores a plurality of setting conditions for the peripheral speed of the leveling roll group according to the maximum steepness. When the maximum steepness is input from the shape measuring device 3, the control unit 7 is optimal from the plurality of setting conditions. And the setting information is output to the drive control unit 24. The control unit 7 is configured by a computer including a central processing unit, a storage device, an input / output device, and the like. The peripheral speed setting condition is stored in the storage device in the form of a setting table, and the operation of selecting the optimum condition from the plurality of setting conditions is realized as a function of the central processing unit. In this embodiment, when selecting the setting condition of the peripheral speed, the optimum condition may be set using the steel sheet thickness and the steel type as parameters together with the maximum steepness. In this case, the thickness and steel type of the steel plate are transmitted from the host computer of the control unit 7 to the control unit 7.

  The drive control unit 24 outputs a control signal to the motors 31 to 35 that respectively drive the leveling roll groups 4 to 6 based on the peripheral speed setting conditions of the leveling roll groups 4 to 6 output from the control unit 7. It is. The drive control unit 24 also controls driving of the transport rolls 25 and 26 on the transport path.

  The drive unit 23 includes a plurality of electric motors 31 to 35, speed reducers 41 to 45 connected to the electric motors 31 to 35, and distributors 51 to 55 connected to the speed reducers 41 to 45. Yes. Each of the motors 31 to 35 can individually set the rotation speed in response to a control signal from the drive control unit 24. The distributors 51 to 55 connected to the speed reducers 41 to 45 have a function of distributing rotational power from the electric motors 31 to 35 to one or a plurality of leveling rolls 11 to 19.

  The roll unit 8 is composed of a plurality of leveling roll groups 4 to 6. In the example shown in FIG. 1, the roll unit 8 includes a first leveling roll group 4, a second leveling roll group 5, and a third leveling roll group 6. Further, next to the first leveling roll group 4, leveling rolls 11 that are not included in the respective leveling roll groups 4 to 6 are arranged, and next to the third leveling roll group 6 also to each leveling roll group 4 to 6. A leveling roll 19 that is not included is arranged. These leveling rolls 11 and 19 are connected to electric motors 31 and 35 via distributors 51 and 55 and transmissions 41 and 45, respectively.

The first leveling roll group 4 includes an upper leveling roll 12 and a lower leveling roll 13. The first leveling roll group 4 is connected to the electric motor 32 via the distributor 52 and the speed reducer 42.
The second leveling roll group 5 is composed of two upper leveling rolls 14 and 16 and a lower leveling roll 15. The second leveling roll group 5 is connected to the electric motor 33 via the distributor 53 and the speed reducer 43.
Further, the third leveling roll group 6 includes an upper leveling roll 18 and a lower leveling roll 17. The third leveling roll group 6 is connected to the electric motor 34 via the distributor 54 and the speed reducer 44.

  The leveling rolls 11 to 19 built in the roll unit 8 are arranged in a staggered manner at predetermined intervals when viewed from the side, and rotate in the same direction as the transport rolls 25 and 26. Further, correction is performed while conveying the steel plate 2.

  With the above configuration, the drive unit 7, the drive control unit 24, and the roll unit 8 can be controlled by dividing the leveling roll groups 4 to 6 according to specifications such as torque necessary for correction and a conveyance speed. And one motor 32-34 is arranged for each leveling roll group 4-6, and drive control part 24 which received a command from control part 7 gives a speed command to each motor 32-34. ing. Further, each group of leveling rolls 12 to 18 connected to the electric motors 32 to 34 via the distributors 52 to 54 is defined as one drive section (leveling roll group), and a circumferential speed command is given to each drive section. Is supposed to give.

  Moreover, in the correction apparatus 1 of this embodiment, in order to correct | amend while producing tension | tensile_strength in the steel plate 2, a different speed command is given with respect to the adjacent leveling roll groups 4-6, and a circumferential speed difference is generated. Specifically, the friction generated between the surface of the leveling roll and the steel plate 2 by increasing the speed command for the entry leveling roll group in the steel sheet conveyance direction with respect to the speed command of the exit leveling roll group. The tension is generated in the steel plate 2 using the force.

  In addition, a reduction control unit 22 is connected to the control unit 7, and a reduction device 21 is connected to the reduction control unit 22. The reduction device 21 adjusts the gap between the upper leveling rolls 12, 14, 16, 18 and the lower leveling rolls 11, 13, 15, 17, 19 based on a control signal from the reduction control unit 22. The reduction device 21 is configured so that the pressing amount of each of the leveling rolls 11 to 19 can be decreased or increased stepwise along the sheet passing direction of the steel plate 2.

Next, a method for correcting the steel plate 2 by the steel plate straightening machine 1 will be described.
First, the uncorrected steel plate 2 is transported along the transport path and passed under the shape measuring instrument 3. At that time, the maximum steepness of the steel sheet is measured by the shape measuring instrument 3. Here, the steepness is a ratio (H / P × 100) between the wave pitch P and the wave height H on the steel plate surface, as shown in FIG. The surface of the steel plate has many waves that cause shape defects caused by rolling or the like, and the shape measuring device 3 can measure the steepness in each wave. Use steepness. The reason why the maximum steepness is used as the basis for setting the peripheral speed difference in the present embodiment is that the steel sheet shape can be reliably corrected by setting the peripheral speed difference according to the maximum steepness. If the average steepness or the minimum steepness is used instead of the steepness, the difference in the peripheral speed of the leveling roll group is reduced, and sufficient tension cannot be applied to the steel sheet, resulting in insufficient shape correction. .

  In order to measure the maximum steepness, it is necessary to measure the steepness over the entire length of the steel sheet. However, if the tip of the steel sheet reaches the roll unit during the measurement of the steepness, the correction is started with the maximum steepness being undetermined. Therefore, the shape measuring instrument 3 needs to be installed at a position away from the roll unit 8 than the full length of the steel plate. Further, when it is difficult to separate the shape measuring device 3 from the roll unit 8 from the length of the steel plate due to restrictions on the installation location of the equipment, the shape measuring device 3 is arranged near the roll unit 8 and the shape measuring device 3 During the measurement of the steepness of the steel plate, the steel plate 2 is passed through with the gap between the leveling rolls 11 to 19 of the roll unit 8 being maximized, and the shape measurement of the steel plate is performed to the full length of the steel plate without correction in the roll unit 8. It is good to go across. And after the steel plate 2 is conveyed to the opposite side to the side where the shape measuring instrument 3 of the roll unit 8 is installed, the reduction device 21 is operated to set the gap between the rolls of the leveling rolls 11 to 19 to an appropriate gap. The correction may be started by further reversing the conveying direction of the steel plate 2 and passing the steel plate 2 through the roll unit 8.

  The correction of the steel plate 2 may be performed by passing the steel plate 2 through the roll unit 8 once or a plurality of times, and preferably the correction is performed by passing the steel plate 2 a plurality of times. In order to pass the steel plate 2 through the roll unit 8 a plurality of times, the steel plate 2 may be reciprocated with respect to the roll unit 8. The following description will be made on the assumption that the steel plate 2 is passed through the roll unit 8 a plurality of times.

  As shown in FIGS. 1 and 3, the maximum steepness of the steel plate 2 measured by the shape measuring instrument 3 is input to the control unit 7. The control unit 7 receives the steel type and thickness of the steel plate 2 to be corrected from the host computer. Then, as shown in step S <b> 1 of FIG. 3, the peripheral speed of each of the leveling roll groups 4 to 6 in a plurality of passes is determined by the control unit 7.

  Specifically, the peripheral speed of the leveling roll groups 4 to 6 at the first pass is a setting table corresponding to the maximum steepness of the steel plate 2 from among a plurality of setting tables stored in the storage device of the control unit 7. Determine by selecting. At the second and subsequent passes, the same setting table as that at the first pass is selected, or a setting table in which the peripheral speeds of the leveling roll groups 4 to 6 are all the same is selected.

  FIG. 4 shows an example of the setting table. In this setting table, the combination of the peripheral speed of the leveling roll group on the roll unit entry side, the peripheral speed of the leveling roll group in the center of the roll unit, and the peripheral speed of the leveling roll group on the roll unit exit side is set. The peripheral speed is set to increase from the entry side to the exit side of the roll unit 8. That is, in the setting table shown in FIG. 4, the setting value of the peripheral speed is, for example, a <b <c. The magnitude relationship between a, b, and c is not limited to this, and may be a = b <c or a <b = c. Another setting table includes a setting in which the peripheral speed is constant from the roll unit entrance side to the exit side. In such a setup table, a = b = c. Here, the leveling roll group on the roll unit entry side refers to the leveling roll group on the entry side of the steel plate 2 in the roll unit 8. Similarly, the leveling roll group on the roll unit exit side refers to the roll unit 8. The leveling roll group in the conveyance direction outgoing side of the steel plate 2 is pointed out.

  In the present embodiment, when selecting the setting table, the plate thickness of the steel plate and the steel type may be set as parameters together with the maximum steepness. In this case, information transmitted from the host computer of the control unit 7 to the control unit 7 is used as the plate thickness and the steel type of the steel plate.

  Next, as shown in step S <b> 2 of FIG. 3, the setting table information is output to the drive control unit 24. The drive control unit 24 also outputs the number of times the steel plate 2 has passed through the roll unit 8. And as shown to step S3, in the drive control part 24, based on the information of the input setting table and the information of the frequency | count of passage, the peripheral speed of each motor 31-35 is adjusted, The control signal is sent to each motor 31-31. 35.

  Here, since the conveyance direction of the steel plate 2 with respect to the roll unit 8 is reversed every time it passes, when selecting the same setting table as the case of the first pass in the second and subsequent passes, the second and subsequent passes are selected. At the time of passage, it is necessary to change the setting of the peripheral speed of each of the leveling roll groups on the entry side and the exit side every time the steel plate 2 passes. For example, in FIG. 1, when the entry side at the first passage of the steel plate 2 is the third leveling roll group 6 side, the peripheral speed of the third leveling roll group 6 is matched with the peripheral speed of the input leveling roll group of the setting table. . In the subsequent second pass, the entry side is the first leveling roll group 4 side, so the peripheral speed of the first leveling roll group 4 is matched with the peripheral speed of the entry leveling roll group in the setting table.

  On the other hand, in order to make all the peripheral speeds of the leveling roll groups 4 to 6 the same at the second and subsequent passes, it is sufficient to select a setting table in which the peripheral speeds a, b, and c shown in FIG. .

  In the setting table, when the setting value of the peripheral speed is, for example, a <b <c, the peripheral speed of the leveling roll group on the output side is larger than that on the input side, so Is granted. The larger the maximum steepness, the greater the difference in peripheral speed between the leveling roll groups 4 to 6, so that the shape can be corrected more reliably. On the other hand, if the difference between the peripheral speeds is too large, slip occurs between the steel plate 2 and the leveling rolls 11 to 19, and it becomes impossible to efficiently apply tension to the steel plate 2, and the leveling rolls 11 to 19 are also worn. There is a fear. Therefore, the setting of the peripheral speeds of the leveling rolls 11 to 19 in the setting table may be determined experimentally to an optimum peripheral speed difference for each maximum steepness of the steel plate 2 and to the extent that no slip occurs.

  All the above setting changes of the peripheral speed may be performed in the drive control unit 24.

  In parallel with outputting the setting table information from the control unit 7 to the drive control unit 24, the steel type of the steel plate 2, the plate thickness, the number of times the steel plate passes through the roll unit, etc. from the control unit 7 to the reduction control unit 22. The information of is output. The reduction control unit 22 determines a reduction condition for each passing time of the steel sheet based on the information such as the steel type, the plate thickness, and the number of passages, and controls the reduction device 21 based on the determined reduction condition so as to control the upper leveling roll 12. , 14, 16, 18 and the lower leveling roll 11, 13, 15, 17, 19 are adjusted. The reduction device 21 sets the pressing amount of each of the leveling rolls 11 to 19 so as to decrease or increase stepwise along the sheet passing direction of the steel plate 2.

  And according to the conditions determined in each control part 22 and 24 as shown to step S4 of FIG. 3, the peripheral speed of each leveling roll group 4-6 and the pushing amount of each leveling roll are set, and roll unit Correction is performed by passing the steel plate while reciprocating the steel plate with respect to 8.

  In addition, the shape measurement by the shape measuring device 3 may be performed on the steel plate before straightening, and the shape measurement of the steel plate being straightened may not be performed. Alternatively, the correction state may be confirmed by measuring the shape of the steel sheet before or after the final passage with respect to the roll unit 8.

According to the steel plate straightening device and the straightening method of the present embodiment, the shape measuring instrument 3 measures the maximum steepness of the steel plate 2 before straightening, and the control unit 7 determines a plurality of steepnesses based on the maximum steepness of the steel plate 2 before straightening. Since the respective peripheral speeds of the leveling roll groups 4 to 6 are set, the tension applied to the steel plate 2 can be appropriately set according to the maximum steepness, and by bending back deformation by the plurality of leveling roll groups 4 to 6 The correction of the steel plate 6 can be executed reliably.
Moreover, according to this embodiment, since the control part 7 sets so that the circumferential speed of the several leveling roll groups 4-6 may be increased toward the exit side from the entrance side of the steel plate 2, leveling roll groups 4- Tension can be reliably applied to the steel plate 2 that has been bent back and deformed by 6, and the steel plate 2 can be reliably corrected.
Furthermore, according to this embodiment, when the steel plate 2 is passed through the leveling roll groups 4 to 6 a plurality of times, the control unit 7 at least at the time of the first passage has the plurality of leveling roll groups 4 to 4. Since the peripheral speed of 6 is set to increase from the entry side to the exit side of the steel plate 2, an appropriate tension is applied to the steel plate 2 that has just been measured and has not been corrected. be able to.
Furthermore, according to the present embodiment, since the peripheral speeds of the plurality of leveling roll groups 4 to 6 are set to be the same during the second and subsequent passes, when the maximum steepness of the steel plate 2 is relatively small, 2 The steel plate 2 can be corrected only by bending back deformation at the time of passing after the first time, and there is no possibility that the steel plate 2 is excessively corrected.
In addition, according to the present embodiment, since the circumferential speed of the plurality of leveling roll groups 4 to 6 is set to increase from the entry side to the exit side of the steel plate 2 at the time of passing all of the steel plate 2, When the maximum steepness of the steel plate 2 is relatively large, it is possible to apply tension to the steel plate 2 that is undergoing the bending-back deformation at the time of all passage, and the steel plate 2 can be reliably corrected.

  As described above, according to the present embodiment, the shape correction effect and productivity are remarkably improved as compared with the conventional one by quantitatively instructing the tension correction of the steel sheet based on the measurement result of the shape measuring instrument 3. It has the effect of doing.

  First, using 9 leveling rolls as shown in Fig. 1, the condition that 0.2% proof stress is 500MPa, the plate thickness is 9mm, and no tension is applied to a stainless steel plate with a maximum steepness of 5%. However, one-pass straightening was performed under the condition that the plastic deformation rate on the entry side was set to 80%, but the shape did not improve, and a shape defect with a steepness of about 4% remained in the straightened stainless steel plate.

  Using the same straightening machine and stainless steel plate, refer to Patent Document 2 and Patent Document 3, and set the peripheral speed of the leveling roll in the drive section of the entrance side, the intermediate side and the exit side, respectively, resulting in a difference in the peripheral speed Although one-pass correction was performed under the conditions, the shape of the stainless steel plate was not improved, and a shape defect with a steepness of about 3% remained on the corrected steel plate.

  On the other hand, using the same straightening machine and stainless steel plate, measure the steepness of the stainless steel plate using a shape measuring instrument before straightening, and output the peripheral speed conditions corresponding to the steepness from the control unit to the drive control unit. After one-pass correction, the steepness of the workpiece after correction improved to 0.8% or less.

DESCRIPTION OF SYMBOLS 1 ... Steel plate straightening device, 2 ... Steel plate, 3 ... Shape measuring device, 4, 5, 6 ... Leveling roll group, 7 ... Control part.

Claims (10)

A shape measuring instrument that measures the maximum steepness of the steel sheet before straightening,
A plurality of leveling roll groups capable of imparting tension to the steel sheet by individually setting the peripheral speed;
Based on the maximum steepness of the steel sheet before straightening, a control unit that sets each peripheral speed of the plurality of leveling roll groups,
A steel sheet straightening device comprising:   The steel sheet straightening device according to claim 1, wherein the control unit is configured to increase a peripheral speed of the plurality of leveling roll groups from an entrance side to an exit side of the steel plate in the conveyance direction. .   When the steel plate is passed through the leveling roll group a plurality of times, the control unit is configured to determine the circumferential speed of each of the plurality of leveling roll groups at least during the first passage. The steel sheet straightening device according to claim 1, wherein the steel sheet straightening device is set so as to increase from the entry side toward the exit side.   The said control part sets the circumferential speed of each of these several leveling roll groups to the same at the time of the 2nd time and subsequent passage, The correction apparatus of the steel plate of Claim 3 characterized by the above-mentioned.   When the steel plate is passed through the leveling roll group a plurality of times, the control unit enters the circumferential speed of each of the plurality of leveling roll groups in the conveyance direction of the steel plate during all passages. It sets so that it may increase toward the exit side from the side, The correction apparatus of the steel plate of Claim 1 or Claim 2 characterized by the above-mentioned. A method of correcting a steel sheet by a plurality of leveling roll groups capable of imparting tension to the steel sheet by individually setting a peripheral speed,
Measuring the maximum steepness of the steel sheet before straightening;
Based on the maximum steepness of the steel sheet before straightening, setting the peripheral speed of each of the plurality of leveling roll groups, and correcting the steel sheet with the plurality of leveling roll groups;
A method for correcting a steel sheet, comprising:   The steel sheet correction method according to claim 6, wherein the circumferential speed of the plurality of leveling roll groups is set so as to increase from the entrance side to the exit side of the steel plate in the transport direction.   When the steel sheet is passed through the leveling roll group a plurality of times, at least at the time of the first passage, the peripheral speed of each of the plurality of leveling roll groups is set to the exit side from the entering direction of the steel sheet. The steel sheet straightening method according to claim 6, wherein the steel sheet is set so as to increase toward the surface.   The steel sheet straightening method according to claim 8, wherein the peripheral speeds of the plurality of leveling roll groups are set to be the same during the second and subsequent passes.   When the steel plate is passed through the leveling roll group a plurality of times, the circumferential speed of each of the plurality of leveling roll groups is changed from the entry side to the delivery side of the steel plate during all passages. It sets so that it may increase toward the direction, The correction method of the steel plate of Claim 6 or Claim 7 characterized by the above-mentioned.

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