JP2006007235A - System for controlling sheet camber and device for detecting sheet camber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control system of sheet camber and a sheet camber detecting device by which the amount of sheet camber is quantitatively controlled. <P>SOLUTION: This system is provided with the sheet camber detecting devices 2, 3 which are provided between an inlet-side table roller 13 and an outlet-side table roller 14, a detecting circuit 4 of the amount of pickup for measuring the dimension ( the amount of pickup ) between the top surface of the lower work roll 10 and the top surface of the inlet side table roller and a rolling mill 1 with which the sheet camber is controlled by controlling the amount Xi of pickup. In the rolling mill, the amount of pickup is set every rolling pass of a rolled stock 20, thickness on the inlet side of the rolled stock, thickness and the position of threading height on the outlet side are measured, the camber Δh of the rolled stock which is rolled is determined from the difference between the preset amount of pickup and the position of threading height on the outlet side and the preset value of the amount of pickup is controlled so that the determined camber becomes not more than the prescribed range. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plate warpage control system and a plate warpage detection device that control a plate warpage that occurs on the exit side of a rolling mill.

  In a rolling mill such as thick plate rolling, warpage of the sheet occurs on the side of the rolled material, and therefore the operation is stopped due to damage to the rolling mill and the front and rear equipment, or it is bitten in the next rolling pass. Since it is difficult to correct the warpage, it takes time to correct the warpage of the board, resulting in a decline in productivity, a reduction in quality due to the occurrence of warpage of the board, and a reduction in yield due to the cutting off of the warpage. Yes.

  For this reason, attempts have been made to elucidate the causes of sheet warpage and improve various rolling methods. As a result, in thick plate rolling, a method of controlling the amount of picking up the lower work roll that can be handled quantitatively and is considered to have a large effect on the warpage of the sheet among various factors of occurrence of warpage has been proposed. (For example, refer to Patent Document 1).

  In this method, thick plate rolling is performed by controlling the distance (pickup amount) between the lower work roller top surface and the table roller top surface based on the pass schedule determined by the rolling pass schedule, the reduction amount, and the entry side plate thickness dimension. There is known a method for controlling the amount of warpage that can be placed on the substrate.

In addition, as a device for detecting sheet warpage online in the production line of rolled material, a plurality of passage detection lasers are arranged on the conveyance table roller in the height direction of the rolled material, and the trajectory of the passing position of the rolled material is used. There is a warp detection device that attempts to determine the warping direction of a plate (see, for example, Patent Document 2).
Japanese Examined Patent Publication No. 63-64253 Japanese Patent No. 3358708

  The environment around the rolling mill is that, in the case of thick plate rolling, the rolling material has a high temperature of 1000 ° C or higher and the radiant heat is very high, and the impact and vibration when the rolling material is caught in the upper and lower work rolls. However, since a large amount of rolling water and its water vapor are applied to the rolled material, various sensors for measuring the shape of the rolled material are required, but in reality it is highly reliable. Providing the device is difficult, and only limited types of sensors are used.

  Although the method of controlling the amount of sheet warpage from the pickup amount according to Patent Document 1 described above uses a signal from a sheet warpage detection device for rolled material during rolling, there is a description of sheet warpage detection for use in the environment described above. The specific configuration of the device is not shown.

  Also, in practice, it is difficult to install a reliable plate warp detection device, and even if it is installed, it is difficult to perform reliable detection, so quantitative control based on measured values is not performed. .

  Therefore, the plate warpage state consisting of various generation factors can be visually judged from the trace data of the plate warp state based on the rolling result, or it can be determined by experience from learning from the quality trace data in the post-rolling process. It was driven by an expert who had driving experience.

  Further, in the plate warpage detection method disclosed in Patent Document 2, a large planar optical space is required on the transport roller table, and a resolution higher than the arrangement pitch of the arranged passage detection laser beams can be obtained. Therefore, it is difficult to apply to the case where the amount of sheet warpage is measured in an environment around a rolling mill.

  The present invention has been made to solve the above problems, and provides a sheet warpage amount detection device capable of measuring even in adverse environments, and detects the thickness and the amount of sheet warpage of the rolled material, thereby reducing the amount of sheet warpage. An object of the present invention is to provide a plate warpage control system and a plate warpage detection device that can be controlled quantitatively.

  In order to achieve the above object, a sheet warpage control system according to claim 1 of the present invention is a sheet warpage control of a rolled material by a rolling mill provided with a pair of upper and lower work rolls and table rollers on the entry side and the exit side, respectively. The system is a system for measuring a warp detecting device provided between the entrance and exit side transport table rollers, and a dimension (a pickup amount) between the lower work roll top surface and the entrance table roller top surface. A pick-up amount detecting means; and the rolling mill for controlling plate warp by controlling the pick-up amount, wherein the rolling mill sets the pick-up amount for each rolling pass of the rolled material to detect the plate warp. The apparatus measures the sheet thickness on the entry side of the rolled material, the sheet thickness on the exit side, and the sheet passing height position, and rolls from the difference between the set pickup amount and the sheet passing height position on the exit side. Before Determine the amount of warpage of the rolled material, the rolling mill is characterized in that the amount of warpage obtained was made to control the pickup amount set value to be equal to or less than the predetermined range.

  In order to achieve the above object, a sheet warpage detection apparatus according to claim 8 of the present invention is a rolling material rolled by a pair of upper and lower work rolls and a rolling mill provided with table rollers on the entry side and the exit side, respectively. It is a plate warp detection device, and a laser beam is scanned vertically on the side surface of the rolled material from the gap in one side surface direction between the entrance side and exit side table rollers, and the position of the reflected light is detected and the rolling is performed. A warp detecting device for obtaining a thickness and a threading position of the material, and a pickup amount detecting means for measuring a dimension (pickup amount) between the lower work roll top surface and the entry side table roller top surface, The plate warpage detection device is characterized in that a warpage amount is obtained from a difference between a vertical plate passing position of the rolled material and the pickup amount.

  As described above, according to the present invention, the amount of warpage of the rolled material passed between the upper and lower work rolls is irradiated with a laser beam from a small space in the side surface direction of the rolled material, and the reflected light is irradiated. A plate warp detecting device for detecting the position of the rolled material and measuring the plate height position and thickness of the rolled material, and a pickup for measuring the dimension (pickup amount) between the lower work roll top surface and the table roller top surface The sheet warpage detection device is equipped with a detection means and can measure even under adverse measurement environments, so the sheet warpage can be controlled by quantitatively detecting the thickness of the rolled material and the amount of sheet warpage. A control system and a board warpage detection device can be provided.

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

  FIG. 1 is a configuration diagram of a plate warpage control system in thick plate rolling. The plate warpage control system includes a rolling mill 1 that rolls the rolled material 20 into a predetermined plate shape, and plate warpage detection devices 2, 3 that detect the thickness and warpage of the rolled material 20 on the entry side and the exit side of the rolling mill 1. And a pickup amount calculation circuit 4 for detecting a pickup amount, which will be described later, set by the rolling mill 1.

  Next, the detailed configuration of each unit will be described. The rolling mill 1 includes a pair of upper and lower work rolls 10a and 10b, upper and lower backup rolls 11a and 11b, a backup roll box 12 that supports the lower backup roll 11b, a plurality of entry sides that convey the rolling material 20, an exit side table roller 13, 14, a hydraulic cylinder 15 that drives the lower work roll up and down, a hydraulic control device 16 thereof, and a plate warpage control device 17 that controls the top work position of the lower work roll 10b.

  Next, the configuration of the plate warpage detection device 2 will be described with reference to FIG. 2A is a cross-sectional view of the rolled material 20 as viewed from the cross-sectional direction, and FIG. 2B is a plan view thereof.

  In the figure, the plate warpage detection device 2 is reflected from a side surface of the rolling material 20 and a laser scanner 2 a 1 that scans the side surface of the rolling material 20 in the vertical direction in a small space between the table rollers 13 and 14. A position detection unit 2a comprising a CCD camera 2a2 for detecting the reflected position of the laser beam, a position detection control unit 2b for detecting the thickness of the rolled material and the plate height position from the output signal of the CCD camera 2a2, An air purge mechanism 2c provided on the front surface of the plate warpage detection device 2 for keeping the air in the optical space of the irradiation and reflection optical path clean, and air for cleaning the air in this optical space from the side of the upper end of the rolled material 20 And an air purge device 30 having a purge hood.

  Next, the detailed setting of this board curvature detection apparatus 2 is demonstrated. Since the plate warpage detection devices 2 and 3 have the same configuration, the plate warpage detection device 2 will be described below, and the description of the plate warpage detection device 3 will be omitted.

  The plate warp detection device 2 is a position measurement device based on the optical triangulation method, and the laser beam detected by the CCD camera 2a2 is an argon having a predetermined output in order to ensure the S / N ratio of the detection signal. A laser is used, and furthermore, the spectral difference between the radiant energy of the rolled material 20 and the energy of the laser beam is separated by an optical filter to stabilize the detection signal.

  Further, the laser scanner 2a1 is a parallel scanning optical system so that scanning is performed at a constant speed at the scanning position of the side surface of the rolled material 20, and the optical conditions received by the CCD camera 2a2 can be detected at a uniform angle as much as possible within the measurement range. Set as follows.

  Further, the scanning range of the laser beam is set in a range in which a margin is previously considered in consideration of the thickness measurement range of the rolled material 20, the plate warpage amount to be measured, and the fluctuation range of the plate passing position.

  The scanning speed of the laser scanner 2a1 is set to a scanning speed at which a measurement resolution in the moving direction required at the maximum sheet passing speed of the rolled material 20 is obtained, and the CCD camera 2a2 obtains a required signal level at the scanning speed. The brightness of the light receiving lens and the light receiving sensitivity of the CCD element are selected and used so that the received light sensitivity can be obtained.

  The laser scanner 2a1 and the CCD camera 2a2 are mounted on the same base so that the optical setting conditions do not fluctuate even with a temperature change.

  Next, in order to ensure the reliability of such an optical apparatus, the setting for measures for ensuring the measurement environment of the plate warpage detection device 2 will be described. In order to prevent contamination inside the apparatus, the inside of the plate warp detection device 2 is filled with gas or air and purged with an internal pressure.

  The window shape of the air purge mechanism 2c is a minimum shape necessary for the optical path of the laser beam, and a mechanism for constantly purging air from the inside is provided so that external dust does not enter the air purge mechanism 2c. .

  In addition, the objective distance from the rolled material 2 is set at a distance of at least 1000 mm in order to reduce the influence of heat and vibration, and the laser beam projection and light receiving window glass 2a3 surface is an optical glass that cuts heat rays. A filter is used to cut the heat rays from the rolled material 20.

  Furthermore, if the front end of the air purge mechanism 2c is provided with a shutter mechanism (not shown) that opens only at the time of measurement, it is possible to extend the maintenance life against the dirt on the window surface of the optical window glass 2a3.

  Further, the plate warpage detection device 2 is installed by laying a vibration isolating material such as a vibration isolating rubber between the installation surface and suppressing the impact and vibration when the rolling mill 1 is bitten.

  Next, the principle of plate warpage control set in this way will be described with reference to FIG. In the figure, the distance Xi (pickup amount) between the top surface of the lower work roll 10b and the top table roller 13 is preset by the rolling mill 1, and the warped state of the rolled material 20 when rolled in the direction of arrow D is shown. FIG.

  Here, the roll top surface refers to a point where the bottom surface of the rolled material 20 passed through on a horizontal plane is in contact with a vertical vertex position on the roll rotation center line. The center lines of the upper and lower work rolls 10a and 10b are set to coincide.

  Further, since the top surfaces of the table rollers 13 and 14 are set at the same level, the distance Xi (pickup amount) between the top surface of the lower work roll 10b and the top table roller on the entry side and the pickup amount are shown. The distance Xo between the top surface of the lower work roll 10b and the top surface of the exit table roller is the same.

It has been found in Patent Document 1 and the like that the relationship between the pickup amount Xi and the inlet and outlet plate thicknesses Hi and Ho is expressed by the following equation (1). Here, ΔH is the amount of reduction during the pass. The reference level in the plate thickness direction is set to 0 level on the top surface of the lower work roll 10b.
Xi = −1 / 2 · ΔH (= Hi−Ho) (1)

  FIG. 4A shows that when the pick-up amount Xi of the rolling mill 1 at the initial pass is set from the relationship of the above expression (1), it is rolled to the thickness of the exit side rolled by the rolling mill 1 without warping. It shows the state.

In FIG. 5B, this pickup amount Xi is
Xi> −1 / 2 · ΔH
Is set, the upper warp + Δh (= Hh−Xi) is generated on the exit side of the rolling mill 1.

Also, (c) in the figure shows the pickup amount Xi in (b).
Xi <−1 / 2 · ΔH
Is set, the downward warping −Δh (= Hh−Xi) occurs on the exit side.

  That is, by controlling the set value of the pickup amount Xi, it is possible to control the plate warp amount Δh and its direction (upward warp, lower warp) on the exit side of the rolling mill 1.

  Next, the plate warpage control operation will be described with reference to FIGS. FIG. 4 is a flowchart of the control operation by the rolling mill 1. First, during the initial rolling pass, an initial value based on the pass schedule is transmitted from a rolling control computer (not shown), an initial target value of the pickup amount Xi is set from the plate warpage control device 17a to the hydraulic control device 16, and the hydraulic pressure is supplied from the hydraulic cylinder 15. The cylinder 15 is driven to set the initial position of the top surface of the lower work roll 10b on the lower backup roll 11b.

  Then, the top work position of the lower work roll 10b detected by the position detection sensor 15a is sent to the hydraulic control device 16, and the hydraulic control device 16 sets the set pickup amount Xi and the actual position detected by the position detection sensor 15a. And the setting operation is completed (S1).

  Next, the rolled material 20 is conveyed, the upper and lower work rolls 10a and 10b of the rolling mill 1 are driven to rotate in the direction of the arrow, and the rolled material 20 is rolled (S2).

  Then, when the rolled material 20 passes through the plate warp detection devices 2 and 3, the plate warp detection device 2 at this time is separated from the plate thickness Hi on the input side and the plate thickness Ho on the output side in the plate warpage detection device 3 through the plate. Measurement data of height Hh (position) is detected in time series.

  At this time, the plate warpage detection device 3 receives a pickup amount Xi from a pickup detection circuit 4 to be described later, obtains a plate warpage amount Δh (= Hh−Xi) by calculation, and combines with the plate thickness Ho to provide a plate warpage control device. The measured value and the calculation result are transmitted to 17 (S3).

  In the pickup detection circuit 4, the pickup amount Xi set from the difference between the actual position of the top surface of the lower work roll from the position detection sensor 15a and the position from the table roller 13 (14) top surface position setting table 4a stored in advance. Is calculated in advance.

  The plate warpage control device 17 performs setting calculation (S4) of the pickup amount Xi of the next pass based on the measurement data transmitted from the plate warp detection devices 2 and 3, and transmits this measurement data to the rolling control computer. .

  When the target plate thickness of the next pass is transmitted from the rolling control computer, the plate warpage control device 17 repeats the setting operation of the pickup amount Xi again, and thereafter repeats the above-described flow operation. However, since the rolling mill 1 normally has a reverse rolling function, the rolling direction of the next pass is the reverse of the figure.

  At this time, the functions performed by the plate warpage detection device 2 and the plate warpage detection device 3 are reversed depending on the rolling direction, and the plate warpage amount Δh is obtained by the plate warpage detection device 2 on the exit side of the rolling mill 1.

  Further, the data of the plate warp amount Δh is accumulated in the warp detection device 17 together with the measured plate thickness Hi and Ho data, the relationship with the set value of the pickup amount Xi is learned, and the optimum value is stored in the pickup amount setting table 17a. Save it.

  As described above, according to the first embodiment, the plate thickness Hi, Ho and the plate warp amount Δh can be measured, and the rolling control based on the measurement data can be performed. The amount is controlled quantitatively, and a plate warpage control system and a plate warpage detection device capable of improving the quality and yield of the rolled material can be provided.

  FIG. 5 is a diagram illustrating the configuration of a plate warpage control system and a plate warpage detection device according to the second embodiment of the present invention. The same parts of the second embodiment as those of the plate warpage control system and the plate warpage detection apparatus according to the embodiment of FIG.

  The difference between the second embodiment and the first embodiment is that, in the first embodiment, the plate warp detection devices 2 and 3 are provided before and after the upper and lower work rolls 10a and 10b. In the second embodiment, the plate warp detector is provided. The difference is that only 3 are used.

  That is, the second embodiment is applied when the rolling mill 1 has a rolling function only in one direction. This sheet warpage control system can always be controlled only by rolling in one direction, but can provide a simple sheet warpage control system.

  FIG. 6 is a diagram for explaining the configuration of a plate warpage control system and a plate warpage detection device according to Embodiment 3 of the present invention. The same parts of the third embodiment as those of the plate warpage control system and the plate warpage detection apparatus according to the embodiment of FIG.

  The difference between the third embodiment and the first embodiment is that, in the first embodiment, the top surface level of the entry table roller 1 and the top surface of the exit table roller 14 are the same. The top surface level of the roller 1 and the exit table roller 14 can be set independently, and the pick-up amount is finely adjusted on the entrance side and the exit side to control the plate warp amount with higher accuracy. Different.

  In this case, the pickup detection circuit 4 is also provided with an entry side, exit side table roller 13 and 14 top surface position setting table 4a for each rolling direction. In addition, when the entrance side and exit side tables 13 and 14 roller top surface positions are frequently changed, position detection sensors for detecting the respective table roller top surface positions are provided.

  The present invention is not limited to the embodiments described above, and the environmental countermeasure structure such as the air purge mechanism 2c and the air purge device 30 depending on the environmental conditions in which the plate warp detection devices 2 and 3 are installed. These can be changed as appropriate without departing from the spirit of the present invention.

1 is a configuration diagram of a plate warpage control system and a plate warpage detection device according to Embodiment 1 of the present invention. The block diagram of the board curvature detection apparatus by this invention, and explanatory drawing of detailed arrangement | positioning. Explanatory drawing of operation | movement of the curvature control system by this invention. The flowchart figure explaining the operation | movement of the board curvature control by this invention. The block diagram of the board curvature control system which concerns on Example 2 of this invention. The block diagram of the board curvature control system which concerns on Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling machine 2, 3 Sheet warp detection apparatus 2a, 3a Position detection part 2a1 Laser scanner 2a2 CCD camera 2a3 Optical window glass 2b, 3b Position detection control part 2c Air purge mechanism part 4 Pickup amount detection circuit 4a Carrying table roller top surface position Setting table 10a Upper work roll,
10b Lower work roll 11a Upper backup roll 11b Lower backup roll 12 Backup roll axle box 13 Incoming table roller 14 Outgoing table roller 15 Hydraulic cylinder 15a Position detection sensor 16 Hydraulic control device 17 Plate warpage control device 20 Rolled material 30 Air purge device

Claims (11)

A sheet warpage control system for a rolled material by a rolling mill provided with a pair of upper and lower work rolls and a table roller on each of the entry side and the exit side,
A plate warpage detection device provided between the entry-side and exit-side table rollers;
Pickup amount detection means for measuring a dimension (pickup amount) between the lower work roll top surface and the entry side table roller top surface;
The rolling mill that controls the warpage by controlling the amount of pickup,
The rolling mill sets the pickup amount for each rolling pass of the rolled material,
The plate warpage detection device measures the plate thickness on the entry side of the rolled material and the plate thickness and the feed plate height position on the exit side, and sets the pickup amount and the feed plate height position on the exit side. The amount of warpage of the rolled material rolled from the difference of,
The sheet warpage control system, wherein the rolling mill controls a set value of the pickup amount so that the obtained warpage amount is a predetermined range or less. A sheet warpage control system for a rolled material by a rolling mill provided with a pair of upper and lower work rolls and table rollers on the entry side and the exit side,
A plate warpage detection device provided between the table rollers on the exit side;
Pickup amount detection means for measuring a dimension (pickup amount) between the lower work roll top surface and the entry side table roller top surface;
The rolling mill that controls the warpage by controlling the amount of pickup,
The rolling mill sets the pickup amount for each rolling pass of the rolled material,
The plate warpage detection device measures a plate thickness and a passing plate height position on the exit side of the rolled material, and is rolled from a difference between the set pickup amount and the passing plate height position on the exit side. Obtain the amount of warpage of the rolled material,
The sheet warpage control system, wherein the rolling mill controls a set value of the pickup amount so that the obtained warpage amount is a predetermined range or less.   The plate warpage detection device scans the side surface of the rolled material in the vertical direction in the gap on one side surface between the table rollers, detects the position of the reflected light, and detects the thickness of the rolled material. The plate warpage control system according to claim 1 or 2, wherein the plate height position in the direction is obtained.   The pickup amount detection means includes a position detection sensor for detecting the lower work roll top surface position, and a pickup amount detection circuit for obtaining a difference between an output of the position detection sensor and a set value of the entry table roller top surface position. The board warpage control system according to claim 1 or 2, characterized by comprising:   The setting values of the entry side and exit side table roller top surface positions are set tables for setting the respective top surface positions independently, and the pickup amounts on the entry side and the exit side are obtained independently. The plate warpage control system according to claim 4. The warpage detection device is a position detection device of an optical triangulation method,
A laser scanner that scans a laser beam from a vertical direction with respect to the conveying direction of the rolled material,
A CCD camera for detecting reflected light from the side surface of the rolled material;
A position detection control unit that measures the thickness of the rolled material and the height position of the sheet from the signal of the CCD camera;
An air purge mechanism for cleaning the air in the optical space of the laser beam irradiation and the reflection optical path,
4. The plate warpage control system according to claim 3, wherein a warpage amount and a warpage direction are obtained from a difference between the pick-up amount and a passing plate height position on the exit side of the rolled material.   The plate warpage control system according to claim 6, wherein the laser scanner is configured to perform parallel scanning with a laser beam. A sheet warpage detection device for rolled material rolled by a pair of upper and lower work rolls and a rolling mill provided with table rollers on the entry side and the exit side, respectively, in one side direction between the entry side and the exit table roller A warp detection device that scans a laser beam in the vertical direction from the gap to the side surface of the rolled material, detects the position of the reflected light, and obtains the thickness and threading position of the rolled material,
Pickup amount detection means for measuring a dimension (pickup amount) between the lower work roll top surface and the entry table roller top surface;
The plate warpage detection device is characterized in that a warpage amount is obtained from a difference between a vertical plate passing height position of the rolled material of itself and the pickup amount. The warpage detection device is an optical triangulation position detection device,
A laser scanner that scans a laser beam from a vertical direction with respect to the conveying direction of the rolled material,
A CCD camera for detecting reflected light from the rolled material;
A position detection control circuit for measuring the thickness of the rolled material and the height position of the plate from the CCD camera signal;
The plate warpage detection device according to claim 8, further comprising an air purge mechanism that cleans the air in the optical space of the laser beam irradiation and reflected light path.   The pickup amount detection means calculates a pickup amount from the difference between the top work position detection sensor of the lower work roll and the output of the lower work roll top face position detection sensor and the transport table roller top face position setting value output. The plate warpage detection device according to claim 8, further comprising a pickup amount detection circuit.   The plate warpage detection apparatus according to claim 8, wherein the laser scanner is configured to perform parallel scanning with a laser beam.

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