JP2004181468A - Device and method for on-line grinding of work roll, computer program and computer readable recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prolong the interval of work roll exchanges to the utmost by efficiently grinding the work rolls for rolling a band-like steel strip. <P>SOLUTION: Estimated is the pressure which the unworn regions of work rolls WR1 to WR14 receives when the regions are brought into contact with the unworn regions of the work rolls WR1 to WR14 on the other party which are arranged oppositely to each other. When the estimated pressure grows larger than a specified threshold value, the unworn regions are shifted to a position where grinding is enabled by grinding mechanisms 24, 25 to perform grinding. Thus an operation is continued without performing grinding until the work rolls WR1 to WR14 are subjected to heavy pressure. In this way, the overgrinding of the work rolls WR1 to WR14 is prevented and the changing interval of the work rolls WR1 to WR14 is prolonged to the utmost. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a work roll online grinding device, a work roll online grinding method, a computer program, and a computer-readable recording medium, and in particular, is used for online grinding of a work roll for rolling a strip steel plate. It is suitable.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in the field of the steel industry, online grinding has been performed in which a work roll provided in a rolling mill is ground while being incorporated in the rolling mill.
In such online grinding, the work roll is traversed while a rotating grindstone is pressed against the work roll to grind the work roll.
[0003]
However, since the work roll is housed in the housing, when online grinding is performed as described above, the vicinity of both ends of the work roll cannot be ground. However, there is a problem that the material is not ground even after passing through.
[0004]
As a conventional technique for solving such a problem, there is a conventional technique in which the vicinity of both ends of the work roll is ground in advance in a tapered shape, and then the work roll is mounted on the rolling mill to perform online grinding. reference).
[0005]
Further, Patent Literature 1 discloses a technique in which the work roll is moved in the axial direction so that the vicinity of both ends of the work roll is within a grinding range, and online grinding is performed.
[0006]
Further, Patent Literature 1 discloses a technique of measuring the roughness of the work roll surface, comparing the measured roughness with a reference roughness curve, and performing on-line grinding of a region deviating from the reference roughness. Is described.
[0007]
[Patent Document 1]
JP 2001-205311 A
[0008]
[Problems to be solved by the invention]
However, the above-described conventional technology has the following problems.
First, the previously ground region and the online ground region flatten as rolling is performed. Therefore, in such a case, the work roll has to be removed and replaced with a new work roll.
As described above, conventionally, the replacement interval of the work roll is determined by the amount of grinding near both ends of the pre-ground work roll, and it is difficult to increase the replacement interval of the work roll. There was a problem.
[0009]
Conventionally, grinding is performed when the surface of the work roll is rougher than the reference value.Therefore, the reference value must be set so as to reliably prevent the upper and lower work rolls from contacting each other. Did not. Therefore, it is necessary to set the above-mentioned reference value in consideration of a margin, and even when there is no major problem without grinding, the grinding is performed, and there is a possibility that the work roll is excessively ground.
[0010]
As described above, conventionally, there has been a problem that the work roll cannot be efficiently ground, and the life of the work roll is shortened. Therefore, conventionally, there is a problem that it is difficult to increase the work roll change interval in terms of over-grinding the work roll.
[0011]
The present invention has been made in view of the above-described problems, and it is possible to efficiently grind a work roll that rolls a strip-shaped steel sheet and to increase a replacement interval of the work roll as much as possible. The purpose is to do.
[0012]
[Means for Solving the Problems]
The work roll online grinding apparatus of the present invention is a work roll online grinding apparatus for online grinding a work roll for rolling a strip-shaped steel sheet that has been subjected to a predetermined process and conveyed. A work roll grinding device for grinding with, and a grinding control means for causing a predetermined region of the work roll to be ground by the work roll grinding device, wherein the grinding control device has a predetermined region of the work roll. Estimate the pressure received when coming into contact with a partner work roll arranged opposite to each other, and when the estimated pressure is larger than a predetermined threshold, move the work roll in the axial direction, A predetermined area of the work roll is ground by the work roll grinding device.
[0013]
An online grinding method for a work roll according to the present invention is an online grinding method for a work roll for grinding a work roll for rolling a strip-shaped steel sheet that has been subjected to a predetermined process and conveyed, and the work roll has a predetermined shape. Estimate the pressure received when the region comes into contact with the opposing work roll arranged opposite to each other, and when the estimated pressure is larger than a predetermined threshold, move the work roll in the axial direction. Thus, a predetermined area of the work roll is ground.
[0014]
The computer program of the present invention is a computer program for causing a computer to execute a work roll online grinding method for online grinding a work roll for rolling a strip-shaped steel sheet that has been subjected to predetermined processing and conveyed, The predetermined area of the work roll is estimated when the pressure received when it comes into contact with the other work roll disposed opposite to each other, and when the estimated pressure is larger than a predetermined threshold, the work roll is determined. The computer is characterized in that the computer is caused to move in the axial direction so that a predetermined area of the work roll is ground by a work roll grinding device for grinding the work roll online.
[0015]
A computer-readable recording medium according to the present invention has the above-described computer program recorded thereon.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a work roll online grinding apparatus, a work roll online grinding method, a computer program, and a computer-readable recording medium according to the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a diagram showing an example of a schematic configuration of a hot rolling facility according to an embodiment of the present invention.
In FIG. 1, a hot rolling equipment 1 includes a heating furnace 2, a rough rolling mill 3, a finishing rolling mill 4, a run-out table 5, a strip shear 6, a coil winding device 7, and a transport roller speed control device. 8 and a grinding control device 9 provided as grinding control means.
[0018]
The heating furnace 2 is for heating the slab 10 conveyed from a rolled steel sheet manufacturing line (not shown) to a predetermined temperature.
The rough rolling mill 3 is for roughly rolling the slab 10 heated by the heating furnace 2 and supplied to the hot rolling line to form a sheet bar 11.
[0019]
The finishing mill 4 is for finishing rolling the sheet bar 11 continuously by, for example, seven rolling stands F1 to F7 to form a strip 12. As described above, in the present embodiment, the sheet bar 11 corresponds to a strip-shaped steel plate.
[0020]
The rolling stands F1 and F2 are four-high rolling mills having work rolls WR1 to WR4 for finish rolling the sheet bar 11 and backup rolls BR1 to BR4 supporting the work rolls WR1 to WR4.
[0021]
The rolling stands F3 to F7 include work rolls WR5 to WR14, backup rolls BR5 to BR14, and intermediate rolls IMR1 to IMR10 disposed between the work rolls WR5 to WR14 and the backup rolls BR5 to BR14. 6-high rolling mill.
[0022]
Here, a specific configuration of the work rolls WR1 to WR14 disposed on the rolling stands F1 to F7 will be described with reference to FIGS. 2 and 3.
FIG. 2 is a diagram illustrating an example of a configuration of the work rolls WR1 to WR14. FIG. 3 is a diagram illustrating an example of a state in which the work rolls WR1 to WR14 move in the axial direction.
[0023]
As shown in FIG. 2, the work rolls WR1 to WR14 are attached to the housing 21. More specifically, the work rolls WR1 to WR14 are attached to the housing 21 by attaching the shaft portions 23 of the work rolls WR1 to WR14 to the roll chock 22 provided in the housing 21.
[0024]
The work rolls WR1 to WR14 attached to the housing 21 in this manner are configured to be movable in the axial direction as shown in FIG.
[0025]
Further, as shown in FIG. 2, an operation-side grinding mechanism 24 for grinding the work rolls WR1 to WR14 and a drive-side grinding mechanism 25 are disposed on the side of each of the work rolls WR1 to WR14. I have.
[0026]
The operation-side grinding mechanism 24 and the drive-side grinding mechanism 25 have disk grindstones 24 a and 25 a at their ends, respectively, and are supported by a gantry frame 26 attached to the housing 21. As described above, in the present embodiment, two grinding mechanisms as work roll grinding devices are arranged beside each of the rolling stands F1 to F7.
[0027]
Then, under the control of the grinding control device 9 described later, the disc grindstones 24a and 25a rotated at a predetermined speed are moved along the gantry frame 26 while being pressed against the work rolls WR1 to WR14 to grind the work rolls WR1 to WR14. (See FIGS. 4A and 4B).
[0028]
An operation-side roll position detection sensor 27 and a drive-side roll position detection sensor 28 are also provided beside the work rolls WR1 to WR14.
The operation side roll position detection sensor 27 and the drive side roll position detection sensor 28 are for detecting the positions of the work rolls WR1 to WR14. This makes it possible to monitor how far the work rolls WR1 to WR14 have moved in the axial direction.
[0029]
Returning to FIG. 1, the run-out table 5 is for cooling the strip 12 that has been finish-rolled by the finish rolling mill 4.
The coil winding device 7 is generally called a coiler, and is for winding the strip 12 cooled by the run-out table 5. In the present embodiment, the strip 12 is alternately wound by two coil winding devices 7a and 7b.
[0030]
The strip shear 6 is for cutting the strip 12 when a predetermined length of the strip 12 is wound by the coil winding device 7.
[0031]
The speed control device 8 is for controlling the conveying speed of the slab 10, the sheet bar 11, and the strip 12 by adjusting the rotation speed of a plurality of conveying rollers provided in the hot rolling line. .
[0032]
The grinding control device 9 controls the grinding operation of the work rolls WR1 to WR14 by the operation-side grinding mechanism 24 and the drive-side grinding mechanism 25.
As shown in FIG. 1, the grinding control device 9 includes a contact pressure calculating unit 13, a grinding necessity determining unit 14, a rolling interval adjusting unit 15, a grinding shift amount setting unit 16, a grinding instruction unit 17, Shift amount setting means 18.
[0033]
The contact pressure calculating means 13 has a function of calculating a non-wear area of the work rolls WR1 to WR14 and calculating a contact pressure in the calculated non-wear area.
Here, the non-abrasion area is an area where the strip being finish-rolled is not passed through, and specifically, is an end portion on the rolling surface of the work rolls WR1 to WR14 (for example, an area A in FIG. 6).
[0034]
Further, the contact pressure is a pressure received when the work rolls WR1 to WR14 come into contact with the opposing work rolls WR1 to WR14 arranged opposite to each other.
[0035]
Describing the specific processing of the contact pressure calculating means 13, first, roll information on the work rolls WR1 to WR14 and rolled material information on the rolled material (sheet bar 11) are input. Then, the wear amount of the work rolls WR1 to WR14 is predicted based on the input information, and the size of the non-wear region (the length, width, and depth of the non-wear region) is determined based on the predicted wear amount. Is calculated.
[0036]
Here, the roll information is information such as the amount of wear, the amount of expansion, and the position of the work rolls WR1 to WR14, and is information obtained from past rolling results. The rolled material information is information such as the thickness, width, length, and temperature of the sheet bar 11.
[0037]
The contact pressure calculating means 13 uses the calculated size of the non-wear area and the load assumed to be applied to the non-wear area at the time of finish rolling as parameters, and the work rolls WR1 disposed opposite to each other. The contact pressure generated when the non-abrasion regions of WR14 contact each other is calculated.
[0038]
In the present embodiment, the size of the non-wear area is obtained as follows.
First, as shown in the characteristic diagram 50 of FIG. 5, a regression analysis is performed from past rolling results of the work rolls WR1 to WR14 to calculate a wear coefficient a. Then, the wear amount (amount of wear / radius of the work roll) in the roll barrel direction (the axial direction of the work rolls WR1 to WR4) is calculated using the calculated wear coefficient a.
[0039]
FIG. 6 is a characteristic diagram showing a comparison between the calculated value of the amount of wear in the roll barrel direction thus calculated and the actually measured value.
From the characteristic diagram 60 in FIG. 6, it can be seen that the calculated value of the amount of wear and the actually measured value match very well.
[0040]
Therefore, in the present embodiment, the wear amount of the work rolls WR1 to WR14 is predicted as described above, and the size of the non-wear region is obtained based on the predicted wear amount.
[0041]
Returning to FIG. 1, the grinding necessity determining means 14 determines whether the contact pressure calculated by the contact pressure calculating means 13 is larger than a predetermined threshold value, and thereby the grinding of the non-wear area is performed. It has a function to determine whether it is necessary.
[0042]
That is, in the present embodiment, grinding is performed on the non-abrasion region where the contact pressure is determined to be larger than the predetermined threshold, and otherwise, grinding is not performed because no major problem occurs. To
[0043]
The rolling interval adjusting means 15 calculates the time required to grind the non-wearing area requiring grinding when the grinding necessity determining means 14 determines that grinding is necessary (this description will be made in the following description). The time is called the grinding time).
[0044]
The grinding time is determined by the number of rotations of the work rolls WR1 to WR14 to be ground, the number of rotations of the disc grindstones 24a and 25a, the pressing force of the disc grindstones 24a and 25a on the work rolls WR1 to WR14, and the traverse of the grinding mechanisms 24 and 25. Calculated based on speed.
[0045]
Then, an operation delay signal ODS for causing the sheet bar 11 to be finish-rolled next to be conveyed to the finish rolling mill 4 with a predetermined time longer than the above-mentioned grinding time is transmitted to the heating furnace 2 and the rough rolling mill. 3 and output to the speed control device 8. As a result, the sheet bar 11 to be finish-rolled next is not conveyed to the finish rolling mill 4 until a predetermined time according to the operation delay signal ODS has elapsed.
[0046]
The rolling interval adjusting means 15 monitors the current position of the sheet bar 11 to be finish-rolled next, and for example, when starting to grind the work rolls WR1 to WR14, However, it also has a function of stopping the processing for grinding if the wafer is transported immediately before the finishing mill 4.
[0047]
That is, if the sheet bar 11 to be finish-rolled next is conveyed immediately before the finish rolling mill 4 and it is not possible to prevent the sheet bar 11 from being conveyed to the finish rolling mill 4 even by performing the above-described control, grinding is performed. To stop the process.
[0048]
In the above, the determination as to whether or not the sheet bar 11 to be finish-rolled next is being conveyed immediately before the finish rolling mill 4 is, for example, provided at a predetermined position before the finish rolling mill 4. What is necessary is just to perform based on the detection result by the sensor 19 which exists.
[0049]
The grinding shift amount setting means 16 is provided with a roll shift signal RS1 for moving the non-abrasion area determined to require grinding by the grinding necessity determining means 14 to a position where it can be ground by the grinding mechanisms 24 and 25. Is output to the corresponding work rolls WR1 to WR14. Thereby, the work rolls WR1 to WR14 move to positions according to the roll shift signal RS1.
[0050]
The grinding instruction means 17 outputs a grinding instruction signal GS to the grinding mechanisms 24 and 25 for grinding the non-wearing area determined to require the above-mentioned grinding.
As a result, the disc grindstones 24a and 25a rotated at a predetermined speed move along the gantry frame 26 while being pressed by the work rolls WR1 to WR14, and the non-abrasion areas determined to require the above-described grinding are ground. Is done. At this time, it is needless to say that the non-wear area is ground by preventing the grinding mechanisms 24 and 25 from interfering with the housing 21.
[0051]
The rolling shift amount setting means 18, for example, outputs the grinding instruction signal GS from the grinding instruction means 17, and after the grinding time calculated by the rolling interval adjusting means 15 elapses, the operation of the grinding mechanisms 24, 25 is performed. After confirming that the work rolls WR1 to WR14 have been finished, a roll shift signal RS2 for moving the work rolls WR1 to WR14 to a position where the next finish-rolled sheet bar 11 can be appropriately finished and rolled is transmitted to the work rolls WR1 to WR14 that have finished grinding. Output to Thereby, the work rolls WR1 to WR14 move to the positions according to the roll shift signal RS2, and the preparation for finish rolling the sheet bar 11 to be conveyed next is completed.
[0052]
Next, a specific operation of the grinding control device 9 will be described with reference to a flowchart of FIG.
[0053]
First, in the first step S1, the contact pressure calculating means 13 waits until the roll information and the material to be rolled are input, and proceeds to step S2 when input.
Then, in step S2, the calculated pressure calculating means 13 calculates the size of the non-wear area of the work rolls WR1 to WR14 based on the information input in step S1, and calculates the contact pressure in the calculated non-wear area. Is calculated.
[0054]
Next, in step S3, the grinding necessity determination means 14 determines whether the contact pressure calculated in step S2 is larger than a predetermined threshold. As a result of this determination, if it is determined that the contact pressure is equal to or less than the predetermined threshold value, and it is determined that grinding of the non-wear area is unnecessary, the processing for grinding is stopped. On the other hand, if it is determined that the contact pressure is larger than the predetermined threshold and it is determined that the non-wear area needs to be ground, the process proceeds to step S4.
[0055]
Then, in step S4, the rolling interval adjusting means 15 calculates the grinding time of the non-wear area determined to require grinding in step S3. The specific processing for calculating the grinding time will be described later.
[0056]
Next, in step S5, the rolling interval adjusting means 15 causes the next finish-rolled sheet bar 11 to grind the non-wear area based on the current position of the next finish-rolled sheet bar 11. It is determined whether or not the sheet is to be conveyed to the finishing mill 4 during that time.
[0057]
As a result of this determination, if the sheet bar 11 to be finish-rolled next is conveyed to the finish rolling mill 4, the processing for grinding is stopped. On the other hand, when the sheet bar 11 to be finish-rolled next is not conveyed to the finish rolling mill 4, the process proceeds to step S6.
[0058]
Then, in step S6, the rolling interval adjusting means 15 outputs the operation delay signal ODS to the heating furnace 2, the rough rolling mill 3 and the speed control device 8, and until the time according to the operation delay signal ODS elapses, The sheet bar 11 to be finish-rolled is not conveyed to the finish rolling mill 4. Thereby, for example, it is possible to prevent the slab 10 and the sheet bar 11 from operating at a speed higher than the current value.
[0059]
Next, in step S7, the grinding shift amount setting means 16 outputs the roll shift signal RS1 to the work rolls WR1 to WR14 that perform grinding, and the non-wear area determined to require grinding in step S3 is The work rolls WR1 to WR14 are moved to positions where they can be ground by the grinding mechanisms 24 and 25.
[0060]
Next, in step S8, the grinding instructing means 17 outputs a grinding instruction signal GS to the grinding mechanisms 24 and 25 to grind the non-abrasion area determined to require grinding.
[0061]
Next, in step S9, the rolling shift amount setting means 18 waits until the grinding is completed, and when the grinding is completed, proceeds to step S10. The determination as to whether or not the grinding has been completed is made as described above, since the grinding time calculated in step S4 has elapsed since the grinding instruction signal GS was output in the processing in step S8, and the grinding mechanism It may be performed by confirming that the operations of 24 and 25 are completed.
[0062]
Then, in step S10, the rolling shift amount setting means 18 outputs the roll shift signal RS2 to the work rolls WR1 to WR14 where grinding has been completed, so that the sheet bar 11 to be finish rolled next can be appropriately finished rolled. The work rolls WR1 to WR14 are moved.
[0063]
Next, the grinding time calculation processing in step S4 in FIG. 7 will be specifically described with reference to the flowchart in FIG.
[0064]
First, in the first step S21, an instruction is given to set the number of rotations of the work rolls WR1 to WR14 to be ground to a specified value (for example, a rated number of rotations) to perform the processing. In the following description, this specified value is referred to as the roll rotation speed N.
[0065]
Next, in step S22, an instruction is given to set the rotation speed of the disk whetstones 24a and 25a to the maximum value (for example, the rated rotation speed) to perform the processing. In the following description, this maximum value is referred to as a grinding wheel rotation speed M.
[0066]
Next, in step S23, the traversing speeds of the grinding mechanisms 24 and 25a are calculated. In the following description, this speed is referred to as a grinding wheel traversing speed U. Then, the grinding wheel traversing speed U is calculated by, for example, the following (Equation 1).
[0067]
Whetstone traversing speed U [mm / sec] = MIN (maximum traversing speed based on equipment constraints, maximum traversing speed based on traversing constraints) ... (Equation 1)
That is, the grindstone traversing speed U is the smaller of the maximum value of the traversing speed based on the facility constraint and the maximum value of the traversing speed based on the traversing constraint.
[0068]
Note that, in the above description, the maximum value of the traversing speed based on the facility constraint is the traversing speed of the grinding mechanisms 24 and 25a when the capacity of the facility is maximized, and is a predetermined value determined by the capacity of the facility.
[0069]
The maximum value of the traversing speed based on the traversing constraint is defined as the traversing speed of the grinding mechanisms 24 and 25a when the grinding mechanisms 24 and 25a are traversed as fast as possible within a range where the work rolls WR1 to WR14 cannot be damaged. Yes, for example, a value calculated by the following (Equation 2).
Maximum value of traversing speed based on traversing constraint [mm / sec] = predetermined constant based on traversing constraint × roll rotation speed N [rpm] ÷ 60 (formula 2)
[0070]
Next, in step S24, it is instructed to perform the processing with the one end in the axial direction of the non-abrasion area determined to need grinding in step S3 in FIG. 7 as a grinding start point (grinding point).
[0071]
Next, in step S25, the pressing force of the disk whetstones 24a and 25a when the above-described grinding start point (grinding point) is ground is calculated. In the following description, this pressing force is referred to as a whetstone pressing force F. Then, the grindstone pressing force F is calculated by, for example, the following (Equation 3).
[0072]
Grinding stone pressing force F [N] = g (roll rotation number N, grinding stone rotation number M, grinding wheel traversing speed U, grinding depth) ... (Equation 3)
That is, the grinding wheel pressing force F is calculated by a predetermined formula using the roll rotation speed N, the grinding wheel rotation speed M, the grinding wheel traversing speed U, and the grinding depth as parameters. The grinding depth is, for example, the depth of the non-wearing area calculated by the contact pressure calculating means 13 in step S2 in FIG.
[0073]
Next, in step S26, it is determined whether the grindstone pressing force F calculated in step S25 is within the control range. If the result of this determination is that the grindstone pressing force F is not within the control range, the process proceeds to step S32 described below. On the other hand, if the grinding wheel pressing force F is within the control range, the process proceeds to step S27, and it is determined whether or not the processing performed on the grinding start point (grinding point) satisfies the conditions for performing good grinding. Is determined using the following (Equation 4).
[0074]
Conditions for good grinding = f (roll rotation speed N, grinding wheel rotation speed M, grinding wheel pressing force F) ... (Formula 4)
That is, in step S26, if the value determined by the predetermined formula using the roll rotation speed N, the grinding wheel rotation speed M, and the grinding wheel pressing force F as parameters is larger than a predetermined threshold, grinding cannot be performed well. And the process proceeds to step S32 described later.
[0075]
On the other hand, when a value determined by a predetermined equation using the roll rotation speed N, the grinding wheel rotation speed M, and the grinding wheel pressing force F as parameters is equal to or less than a predetermined threshold value, it is determined that grinding can be performed satisfactorily. Proceed to step S28.
[0076]
Then, in step S28, an instruction is given to perform processing as a new grinding point at a position shifted by one step (a predetermined distance) in the axial direction from the grinding start point (grinding point).
[0077]
Next, in step S29, it is determined whether the new grinding point instructed in step S28 is the grinding completion point, and whether or not the processing for the non-wearing area determined to require grinding has been completed.
[0078]
If the result of this determination is that the new grinding point is not the grinding completion point, the process returns to step S25, and the processing for the new grinding point specified in step S28 is executed. On the other hand, if the new grinding point is the grinding completion point, it is determined that good grinding can be performed without reducing the grinding efficiency by grinding at the grindstone traverse speed U calculated in step S23, and the process proceeds to step S30.
[0079]
Then, in step S30, it is set so that grinding is performed at the grindstone traverse speed U calculated in step S23.
Next, in step S31, the grinding time of the non-wear area determined to require the above-described grinding is calculated using the following (Equation 5).
[0080]
Grinding time = (peripheral length of work roll to be ground / grinding wheel traversing speed U) + transport time of grinding mechanism ... (Equation 5)
In the above formula (5), the driving time of the grinding mechanism is the time required to transport the grinding mechanisms 24 and 25 waiting at a predetermined position to the grinding start point, and the grinding mechanism 24 after the grinding is completed. , 25 to the predetermined position.
[0081]
As described above, if it is determined in step S26 that the grinding wheel pressing force F is not within the control range, and if it is determined in step S27 that the conditions for performing good grinding are not satisfied, step S26 is performed. Proceed to S32.
[0082]
Then, in step S32, it is determined whether or not the currently instructed grinding wheel rotation speed M is larger than a predetermined lower limit. If the result of this determination is that the currently designated grinding wheel rotation speed M is larger than the predetermined lower limit, the process proceeds to step S33, and the predetermined rotation speed is subtracted from the currently designated grinding wheel rotation speed M to obtain a new value. The wheel rotation speed M is calculated. Then, the process returns to step S24, and the above-described processing after step S24 is performed again using the new grindstone rotation speed M. In this case, it goes without saying that the arithmetic processing is performed in steps S25 and S27 using the new grindstone rotation speed M calculated in step S33.
[0083]
If it is determined in step S32 that the currently specified grinding wheel rotation speed M is equal to or less than the predetermined lower limit, the process proceeds to step S34, in which the predetermined speed is subtracted from the currently specified grinding wheel traverse speed U. To calculate a new grinding wheel traversing speed U. Then, the process returns to step S24, and the above-described processing after step S24 is performed again using the new grinding wheel traverse speed U. In this case, in steps S25 and S30, it goes without saying that arithmetic processing is performed using the new grindstone traverse speed U calculated in step S34.
[0084]
The grinding instruction signal GS output to the grinding mechanisms 24 and 25 in the processing of step S8 in FIG. 7 described above is based on the grinding wheel rotation speed M, the grinding wheel traverse speed U, and the grinding wheel pressing determined in the processing in the flowchart in FIG. Generated based on the force F. That is, the grinding mechanisms 24 and 25 perform grinding with the grindstone rotation speed M, grindstone traverse speed U, and grindstone pressing force F determined in the processing in the flowchart of FIG.
[0085]
The control operation by the grinding control device 9 described above can be realized by using a computer system as shown in FIG.
FIG. 9 is a block diagram illustrating an example of a configuration of a computer system provided in the grinding control device 9.
9, a computer system 90 includes a CPU 91, a ROM 92, a RAM 93, a keyboard controller (KBC) 95 of a keyboard (KB) 94, a CRT controller (CRTC) 97 of a CRT display (CRT) 96 as a display unit, A disk controller (DKC) 100 of a hard disk (HD) 98 and a flexible disk (FD) 99 and a network interface controller (NIC) 102 for connection to a network 101 can communicate with each other via a system bus 103. It has a connected configuration.
[0086]
The CPU 91 controls the components connected to the system bus 93 as a whole by executing software stored in the ROM 92 or the HD 98 or software supplied from the FD 99.
That is, the CPU 91 reads out a processing program according to a predetermined processing sequence from the ROM 92, the HD 98, or the FD 99 and executes the processing program, thereby performing control for realizing an operation described later.
[0087]
The RAM 93 functions as a main memory or a work area for the CPU 91. The KBC 95 controls an instruction input from the KB 94 or a pointing device (not shown).
[0088]
The CRTC 97 controls display on the CRT 96.
The DKC 100 controls access to the HD 98 and the FD 99 that store a boot program, various applications, an edit file, a user file, a network management program, and a predetermined processing program in the present embodiment.
The NIC 102 bidirectionally exchanges data with devices or systems on the network 101.
[0089]
As described above, in the present embodiment, the pressure received when the non-wear area of the work rolls WR1 to WR14 comes into contact with the non-wear area of the opposing work rolls WR1 to WR14 is estimated. When the estimated pressure exceeds a predetermined threshold value, the non-wear area is shifted to a position where the grinding can be performed by the grinding mechanisms 24 and 25, and the grinding is performed. Until a large pressure is applied, the operation can be continued without performing the grinding, and the over-grinding of the work rolls WR1 to WR14 can be prevented. Therefore, the work rolls WR1 to WR14 can be efficiently ground and the replacement interval of the work rolls WR1 to WR14 can be made as long as possible. Thereby, the rolling tonnage until the work rolls WR1 to WR14 are rearranged can be increased as much as possible, and the cost of the product strip can be reduced.
[0090]
Conventionally, when grinding the work rolls WR1 to WR14 online, a method of grinding the work rolls WR1 to WR14 while performing a rolling operation has been generally adopted. In this case, the work rolls WR1 to WR14 cannot be freely moved in the axial direction and ground due to restrictions on the shape of the material to be rolled (sheet bar) and the like. There is a possibility that the non-wearing area cannot be ground.
[0091]
On the other hand, in the present embodiment, the grinding time of the work rolls WR1 to WR14 is estimated, and the sheet bar 11 to be finish-rolled next is conveyed to the finish rolling mill 4 with a predetermined time longer than the grinding time. With this configuration, the work rolls WR1 to WR14 can be ground between rolling operations. Accordingly, the work rolls WR1 to WR14 can be freely moved in the axial direction for grinding. Thus, the non-wearing areas of the work rolls WR1 to WR14 can be reliably ground without interrupting the operation for forming the strip 12.
[0092]
(Second embodiment)
Next, a second embodiment of the present invention will be described. In the above-described first embodiment, the grinding is performed between the rolling operations. However, in the present embodiment, the grinding is performed during the rolling operation. Only a part of the control operation in the grinding control device is different from the embodiment. Therefore, the same portions as those of the first embodiment are denoted by the same reference numerals as those shown in FIGS. 1 to 9, and detailed description is omitted.
[0093]
Like the grinding control device 9 of the first embodiment shown in FIG. 1, the grinding control device of the present embodiment also includes a contact pressure calculation unit 13, a grinding necessity determination unit, a grinding shift amount setting unit, It has grinding instruction means 17 and rolling shift amount setting means. However, the grinding control device according to the present embodiment does not include the rolling interval adjusting means 15 included in the grinding control device 9 according to the first embodiment. Further, the contents of the processing performed by the grinding necessity determination means, the grinding shift amount setting means, and the rolling shift amount setting means are different from those of the grinding control device 9 of the first embodiment. Hereinafter, the contents of the processing performed by these means will be described.
[0094]
First, the grinding necessity determining unit determines whether the contact pressure calculated by the contact pressure calculating unit 13 is larger than a predetermined threshold value to determine whether the non-wear area needs grinding. Is determined, and the grinding time of the non-wearing area determined to require grinding is calculated.
[0095]
Then, it is determined whether or not the grinding is completed before the finish rolling of the strip being finish-rolled is completed. If it is determined that the grinding is completed, the grinding operation is performed. In this determination, for example, based on the length of the strip during the finish rolling and the transport speed, the finish rolling end time is calculated, and the grinding can be completed before the calculated finish rolling end time. It may be determined whether or not this is based on the calculated grinding time.
[0096]
Further, the grinding shift amount setting means moves the work rolls WR1 to WR14 such that the non-wear area determined to require grinding by the grinding necessity determining means is located at a position where the grinding mechanisms 24 and 25 can grind. Even if this is done, it is determined whether or not the finish rolling of the sheet bar 11 can be appropriately performed.
[0097]
This determination may be made, for example, by determining whether the strip is passed near the center of the work rolls WR1 to WR14 even if the work rolls WR1 to WR14 are moved.
[0098]
Then, the grinding shift amount setting means moves the work rolls WR1 to WR14 in the axial direction such that the non-abrasion area determined to require grinding reaches a position where grinding can be performed by the grinding mechanisms 24 and 25.
[0099]
The operation of the grinding shift amount setting means at this time is to output the roll shift signal RS1 to the corresponding work rolls WR1 to WR14, similarly to the grinding shift amount setting means 16 of the above-described first embodiment. May be performed.
[0100]
Furthermore, after confirming that the finish rolling has been completed, the rolling shift amount setting means moves the work rolls WR1 to WR14 to positions where the sheet bar 11 to be finish-rolled next can be appropriately finish-rolled.
[0101]
The completion of the finish rolling may be determined by, for example, detecting the rear end of the strip 12 that has been subjected to the finish rolling on the exit side of the finishing mill 4. Further, the operation when moving the work rolls WR1 to WR14 is similar to that of the rolling shift amount setting means 18 of the first embodiment described above, in which the roll shift signal RS2 is sent to the work rolls WR1 to WR14 that have finished grinding. What is necessary is just to perform by outputting.
[0102]
Next, a specific operation of the grinding control device will be described with reference to a flowchart of FIG.
First, in the first step S41, similarly to step S1 shown in FIG. 7, the process waits until the roll information and the material to be rolled are input. Similarly, the contact pressure in the non-wear area of the work rolls WR1 to WR14 is calculated.
[0103]
Next, in step S43, the grinding necessity determination means determines whether the contact pressure calculated in step S42 is larger than a predetermined threshold. As a result of this determination, if it is determined that the contact pressure is equal to or less than the predetermined threshold and that the grinding of the non-wear area is unnecessary, the processing for grinding is terminated. On the other hand, when it is determined that the contact pressure is larger than the predetermined threshold value and the non-wear area needs to be ground, the process proceeds to step S44.
[0104]
Next, in step S44, the grinding necessity judging means calculates the grinding time of the non-wear area determined to require grinding in step S43. The specific processing at the time of calculating the grinding time is the same as the processing performed by the above-described rolling interval adjusting means 15 (see steps S4 and FIG. 8 in FIG. 7).
[0105]
Next, in step S45, the grinding necessity determination means determines whether grinding can be completed by the time the finish rolling of the strip that is currently finish rolling is completed. If it is determined that the grinding cannot be completed, the processing for grinding is stopped. On the other hand, if it is determined that the grinding can be completed, the process proceeds to step S46.
[0106]
Then, in step S46, the grinding shift amount setting means moves the work rolls WR1 to WR14 such that the non-wear area determined to need grinding in step S43 is at a position where the grinding mechanisms 24 and 25 can grind. It is determined whether or not the finish rolling of the strip can be appropriately performed.
[0107]
As a result of this determination, if it is determined that the finish rolling of the strip cannot be performed appropriately, the processing for grinding is stopped. On the other hand, when it is determined that the finish rolling of the strip can be appropriately performed, the process proceeds to step S47.
[0108]
Then, in step S47, the grinding shift amount setting means sets the work rolls WR1 to WR14 until the non-wearing area determined to need grinding in step S43 becomes a position where grinding can be performed by the grinding mechanisms 24 and 25. To move.
[0109]
Next, in step S48, similarly to step S8 shown in FIG. 7, the grinding mechanisms 24 and 25 are controlled so as to grind the non-wearing area determined to require the above-mentioned grinding. As a result, the non-wearing area determined to require the grinding is ground.
[0110]
Next, in step S49, the rolling shift amount setting unit waits until the finish rolling is completed, and when it is determined that the finishing rolling is completed, the process proceeds to step S50, where the rolling shift amount setting unit determines whether the sheet bar 11 to be finish-rolled next is finished. The work rolls WR1 to WR14 are moved to positions where the finish rolling can be appropriately performed.
[0111]
As described above, in the present embodiment, in order to grind the work rolls WR1 to WR14, if it is determined that the strip can be appropriately finished and rolled even when the work rolls WR1 to WR14 are moved in the axial direction. Since the work rolls WR1 to WR14 are ground while finish rolling, in such a case, the work rolls WR1 to WR14 can be ground without delaying the finish rolling operation. Thereby, the production efficiency of the strip 12 can be improved and the cost can be reduced as compared with the first embodiment described above.
[0112]
(Another embodiment of the present invention)
In order to operate various devices in order to realize the functions of the above-described embodiment, a program code of software for realizing the functions of the above-described embodiment is transmitted to an apparatus or a computer in a system connected to the above-described various devices. The present invention also includes those which are supplied and executed by operating the above-described various devices according to a program stored in a computer (CPU or MPU) of the system or apparatus.
[0113]
In this case, the program code itself of the software realizes the functions of the above-described embodiment, and the program code itself and a unit for supplying the program code to the computer, for example, storing the program code The recorded recording medium constitutes the present invention. As a recording medium for storing such a program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, and the like can be used.
[0114]
When the computer executes the supplied program code, not only the functions of the above-described embodiments are realized, but also the OS (operating system) or other application software running on the computer. Such a program code is also included in an embodiment of the present invention when the functions of the above-described embodiment are implemented in cooperation with the above.
[0115]
Further, after the supplied program code is stored in a memory provided in a function expansion board of a computer or a function expansion unit connected to the computer, a CPU provided in the function expansion board or the function expansion unit based on the instruction of the program code. The present invention also includes a case where the functions of the above-described embodiments are implemented by performing part or all of actual processing.
[0116]
【The invention's effect】
As described above, according to the present invention, when a work roll for rolling a strip-shaped steel sheet that has been subjected to a predetermined process is rolled on-line, predetermined regions of the work roll are disposed to face each other. Estimate the pressure received when it comes into contact with the work roll of the other party, if the estimated pressure is greater than a predetermined threshold, move the work roll in the axial direction, the predetermined area of the work roll Since the grinding is performed, it is possible to prevent the work roll from being ground until immediately before a trouble occurs in rolling. As a result, over-grinding of the work roll can be prevented as much as possible, and the operation can be continued without any trouble in rolling. Therefore, it is possible to make the work roll replacement interval as long as possible, and it is possible to improve the productivity of the strip-shaped steel sheet and reduce the cost.
[0117]
According to another feature of the present invention, a time required for grinding a predetermined area of the work roll is calculated, and the strip-shaped steel sheet is transported to the work roll with an interval equal to or longer than the calculated time. With this configuration, the predetermined region of the work roll can be ground between rolling operations. Thus, the predetermined area of the work roll can be reliably ground without interrupting the operation.
[Brief description of the drawings]
FIG. 1 is a view showing a first embodiment of the present invention and showing an example of a schematic configuration of a hot rolling facility.
FIG. 2 is a diagram illustrating the first embodiment of the present invention and illustrating an example of a configuration in a work roll.
FIG. 3 is a view showing the first embodiment of the present invention and showing an example of a state in which a work roll moves in an axial direction.
FIG. 4 is a view showing the first embodiment of the present invention and showing an example of a state when a work roll is ground.
FIG. 5 is a view showing the first embodiment of the present invention and showing characteristics used when calculating a wear coefficient of a work roll.
FIG. 6 is a characteristic diagram showing the first embodiment of the present invention, showing a comparison between a calculated value and an actually measured value of the amount of wear in the roll barrel direction.
FIG. 7 is a flowchart illustrating the processing in the grinding control device according to the first embodiment of the present invention.
FIG. 8 is a flowchart illustrating the first embodiment of the present invention and describing specific processing in the grinding control device when calculating a grinding time.
FIG. 9 is a block diagram showing the first embodiment of the present invention and showing an example of the configuration of a computer system provided in the grinding control device.
FIG. 10 is a flowchart illustrating processing in the grinding control device according to the second embodiment of the present invention.
[Explanation of symbols]
1. Hot rolling equipment
4 Finish rolling mill
9 Grinding control device
11 Seat bar
12 strips
13 Contact pressure calculation means
14 Grinding necessity determination means
15 Rolling interval adjusting means
16 Grinding shift amount setting means
17 Grinding instruction means
18 Rolling shift amount setting means
24 Operation side grinding mechanism
25 Operation side grinding mechanism
24a, 25a Disk whetstone
F1-F7 Rolling stand
WR1 to WR14 Work roll

Claims (10)

An online grinding device for a work roll that grinds a work roll online for rolling a strip-shaped steel sheet that has been subjected to predetermined processing and conveyed,
A work roll grinding device for grinding the work roll online,
Grinding control means for causing a predetermined area of the work roll to be ground by the work roll grinding device,
The grinding control means estimates a pressure received when a predetermined region of the work roll comes into contact with a counterpart work roll disposed opposite to each other, and when the estimated pressure is larger than a predetermined threshold value. The work roll online grinding device, wherein the work roll is moved in the axial direction so that a predetermined area of the work roll is ground by the work roll grinding device. The grinding control means calculates a time required to grind a predetermined area of the work roll, and at intervals of the calculated time or more, the work roll is made to convey the strip-shaped steel sheet. The online grinding device for a work roll according to claim 1, wherein The apparatus according to claim 1, wherein the grinding control unit estimates the pressure based on an amount of wear of the work roll. The apparatus according to any one of claims 1 to 3, wherein the predetermined area of the work roll is a non-abrasion area at an end of a rolling surface of the work roll. An online grinding method of a work roll for grinding a work roll online for rolling a strip-shaped steel sheet that has been subjected to a predetermined process and conveyed,
The predetermined area of the work roll is estimated when the pressure received when it comes into contact with a counterpart work roll arranged opposite to each other, and when the estimated pressure is larger than a predetermined threshold, the work roll is determined. An on-line grinding method for a work roll, characterized in that a predetermined area of the work roll is ground by moving the work roll in an axial direction. 6. The method according to claim 5, wherein a time required for grinding a predetermined area of the work roll is calculated, and the strip-shaped steel sheet is conveyed to the work roll at intervals longer than the calculated time. Online grinding method of the work roll described in. The method according to claim 5, wherein the pressure is estimated based on a wear amount of the work roll. The method according to any one of claims 5 to 7, wherein the predetermined area of the work roll is a non-abrasion area at an end of a rolling surface of the work roll. A computer program for causing a computer to execute a work roll online grinding method for online grinding a work roll for rolling a strip-shaped steel sheet that has been subjected to predetermined processing and conveyed,
The predetermined area of the work roll is estimated when the pressure received when it comes into contact with the other work roll disposed opposite to each other, and when the estimated pressure is larger than a predetermined threshold, the work roll is determined. A computer program for causing a computer to move in an axial direction so that a predetermined area of the work roll is ground by a work roll grinding device for grinding the work roll online. A computer-readable recording medium on which the computer program according to claim 9 is recorded.

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