JP3733108B2 - Work roll online grinding apparatus, work roll online grinding method, computer program, and computer-readable recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a work roll on-line grinding apparatus, a work roll on-line grinding method, a computer program, and a computer-readable recording medium. In particular, the present invention is used for grinding a work roll for rolling a strip steel plate online. Is preferred.
[0002]
[Prior art]
Conventionally, in the field of the steel industry, online grinding has been performed in which a work roll disposed in a rolling mill is ground while being incorporated in the rolling mill.
In such online grinding, the work roll is ground by traversing the work roll while pressing a rotating grindstone against the work roll.
[0003]
However, since the work roll is housed in the housing, when online grinding is performed as described above, it is impossible to grind the vicinity of both ends of the work roll. There was a problem that it was not ground even after passing.
[0004]
As a conventional technique for solving such a problem, there is a conventional technique in which the vicinity of both end portions of the work roll is ground in advance in a tapered shape and then mounted on the rolling mill to perform on-line grinding (for example, Patent Document 1). reference).
[0005]
Further, Patent Document 1 describes a technique for performing on-line grinding by moving the work roll in the axial direction so that the vicinity of both ends of the work roll falls within a grindable range.
[0006]
Furthermore, the above-mentioned Patent Document 1 discloses a technique for measuring the surface roughness of the work roll surface and comparing the measured roughness with a reference roughness curve to perform 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 technique has the following problems.
First, the pre-ground area and the online-ground area are flattened as rolling is performed. Therefore, in such a case, the work roll has to be removed and replaced with a new work roll.
Thus, conventionally, the work roll reassignment interval is determined by the grinding amount in the vicinity of both ends of the pre-ground work roll, and it is difficult to increase the work roll reassignment interval. 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 coming into contact with each other. There wasn't. Therefore, the reference value has to be set with a margin, and even when grinding is not caused, there is a possibility that grinding is performed and the work roll is excessively ground.
[0010]
Thus, conventionally, there has been a problem that the work roll cannot be ground efficiently and the life of the work roll is shortened. Therefore, conventionally, there has been a problem that it is difficult to lengthen the interval between the above-mentioned work rolls even when the work rolls are excessively ground.
[0011]
The present invention has been made in view of the above-mentioned problems, so that the work roll for rolling the strip steel plate can be efficiently ground so that the reassignment interval of the work roll can be made as long 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 of a work roll for rolling a strip-shaped steel sheet which has been subjected to a predetermined treatment, and the work roll is online. A work roll grinding apparatus for grinding with a work roll grinding apparatus, and a grinding control means for grinding a predetermined area of the work roll by the work roll grinding apparatus, wherein the predetermined area of the work roll is , Estimating the pressure received when contacting with the opposing work roll disposed opposite to each other, when the estimated pressure is greater than a predetermined threshold, moving the work roll in the axial direction, The predetermined region of the work roll is ground by the work roll grinding apparatus.
[0013]
A work roll online grinding method according to the present invention is a work roll online grinding method for grinding a work roll for rolling a strip-shaped steel sheet that has been subjected to a predetermined treatment, and the work roll is ground online. Estimate the pressure that the area receives when it comes into contact with the opposing work rolls arranged opposite to each other, and if the estimated pressure is greater than a predetermined threshold, move the work roll in the axial direction. The predetermined region of the work roll is ground.
[0014]
The computer program of the present invention is a computer program for causing a computer to execute an on-line grinding method for a work roll for grinding a work roll for rolling a strip-shaped steel sheet that has been subjected to predetermined processing and is rolled, When the predetermined area of the work roll comes into contact with the other work roll arranged opposite to each other, the pressure received is estimated, and when the estimated pressure is larger than a predetermined threshold, the work roll is It is characterized in that the computer is caused to move in the axial direction and grind a predetermined region of the work roll by a work roll grinding apparatus for grinding the work roll online.
[0015]
The computer-readable recording medium of the present invention is characterized by recording the above-described computer program.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments 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 facility 1 includes a heating furnace 2, a rough rolling mill 3, a finish rolling mill 4, a runout table 5, a strip shear 6, a coil winding device 7, and a conveying roller speed control device. 8 and a grinding control device 9 disposed as a grinding control means.
[0018]
The heating furnace 2 is for heating the slab 10 conveyed from the rolled steel plate manufacturing line which is not shown in figure to 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 finish rolling machine 4 is for continuously finishing and rolling the sheet bar 11 by, for example, seven rolling stands F1 to F7 to form the strip 12. Thus, 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 that support 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. It has a 6-high rolling mill.
[0022]
Here, a specific configuration of the work rolls WR1 to WR14 disposed in the rolling stands F1 to F7 will be described with reference to FIGS. 2 and 3.
FIG. 2 is a diagram showing an example of the configuration of the work rolls WR1 to WR14. FIG. 3 is a diagram showing 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 WR <b> 1 to WR <b> 14 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 disposed in the housing 21.
[0024]
And the work rolls WR1-WR14 attached to the housing 21 in this way are comprised so that it may be moved to an axial direction as shown in FIG.
[0025]
Further, as shown in FIG. 2, an operation side grinding mechanism 24 and a drive side grinding mechanism 25 for grinding the work rolls WR1 to WR14 are disposed on the sides of the work rolls WR1 to WR14, respectively. Yes.
[0026]
Each of the operation side grinding mechanism 24 and the drive side grinding mechanism 25 has disk grindstones 24 a and 25 a at the tips, and is supported by a gantry frame 26 attached to the housing 21. Thus, in this Embodiment, it is made to arrange | position two grinding mechanisms as a work roll grinding apparatus to the side of each rolling stand F1-F7.
[0027]
Then, the grinding wheels 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, and the work rolls WR1 to WR14 are ground. (See FIGS. 4A and 4B).
[0028]
Further, an operation side roll position detection sensor 27 and a drive side roll position detection sensor 28 are also provided on the sides of 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. Thereby, it becomes possible to monitor to what extent the work rolls WR1 to WR14 have moved in the axial direction.
[0029]
Returning to FIG. 1, the runout table 5 is for cooling the strip 12 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 runout table 5. In the present embodiment, the strips 12 are alternately wound by the two coil winding devices 7a and 7b.
[0030]
The strip shear 6 is for cutting the strip 12 when the strip 12 having a predetermined length is wound around the coil winding device 7.
[0031]
The speed control device 8 is for controlling the transport speed of the slab 10, the sheet bar 11 and the strip 12 by adjusting the rotational speed of a plurality of transport rollers arranged in the hot rolling line. .
[0032]
The grinding control device 9 is for controlling 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 calculation unit 13, a grinding necessity determination unit 14, a rolling interval adjustment unit 15, a grinding shift amount setting unit 16, a grinding instruction unit 17, a rolling Shift amount setting means 18.
[0033]
The contact pressure calculation means 13 has a function of calculating the non-wear area of the work rolls WR1 to WR14 and calculating the contact pressure in the calculated non-wear area.
Here, the non-abrasion region is a region where the strip during finish rolling is not passed, and specifically, is an end portion on the rolling surface of the work rolls WR1 to WR14 (for example, region 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 counterpart work rolls WR1 to WR14 disposed to face each other.
[0035]
A specific process of the contact pressure calculating means 13 will be described. First, roll information related to the work rolls WR1 to WR14 and rolled material information related to the rolled material (sheet bar 11) are input. Based on the input information, the wear amount of the work rolls WR1 to WR14 is predicted. Based on the predicted wear amount, the size of the non-wear region (the length, width, and depth of the non-wear region). ) Is calculated.
[0036]
Here, the roll information is information such as the wear amount, the expansion amount, 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]
Then, 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 during finish rolling as parameters, and the work rolls WR1 arranged to face each other. The contact pressure generated when the non-wear areas of WR14 are in contact with each other is calculated.
[0038]
In the present embodiment, the size of the non-wear region is obtained as follows.
First, as shown in the characteristic diagram 50 of FIG. 5, a regression analysis is performed from the past rolling performance of the work rolls WR1 to WR14 to calculate the wear coefficient a. Then, the wear amount (wear amount / work roll radius) 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 comparing the calculated value of the wear amount in the roll barrel direction calculated in this way with the actually measured value.
It can be seen from the characteristic diagram 60 of FIG. 6 that the calculated value of the wear amount and the measured value agree 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 determination unit 14 determines whether the contact pressure calculated by the contact pressure calculation unit 13 is larger than a predetermined threshold value, thereby grinding the non-wear region. It has a function of determining whether it is necessary.
[0042]
That is, in the present embodiment, grinding is performed for the non-abrasion region in which the contact pressure is determined to be larger than the predetermined threshold value, and in other cases, 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-wear area that requires grinding when the grinding necessity judging means 14 judges that grinding is necessary (this will be described in the following description). Time is referred to as grinding time).
[0044]
This grinding time includes the rotation speed of the work rolls WR1 to WR14 to be ground, the rotation speed of the disc grindstones 24a and 25a, the pressing force of the disc grindstones 24a and 25a to the work rolls WR1 to WR14, and the traversing 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 to be conveyed to the finish-rolling machine 4 with a delay of a predetermined time equal to or longer than the grinding time is used as the heating furnace 2 and the roughing mill. 3 and the speed control device 8. Accordingly, 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 finished and rolled next. For example, when the grinding of the work rolls WR1 to WR14 is about to be started, the sheet bar 11 to be finished and rolled next. However, when it is conveyed just before the finish rolling mill 4, it also has a function of stopping the processing for grinding.
[0047]
That is, if the sheet bar 11 to be finish-rolled next is conveyed immediately before the finish rolling mill 4 and cannot be prevented from being conveyed to the finishing mill 4 even if the above-described control is performed, grinding is performed. Cancel the process.
[0048]
In the above description, whether or not the sheet bar 11 to be finish-rolled next is conveyed immediately before the finish rolling mill 4 is arranged at a predetermined position before the finish rolling mill 4, for example. The detection may be performed based on the detection result of the existing sensor 19.
[0049]
The grinding shift amount setting means 16 is a roll shift signal RS1 for moving the non-abrasion region determined to be ground by the grinding necessity determination 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 to the grinding mechanisms 24 and 25 a grinding instruction signal GS for grinding the non-abrasion region determined to require the above grinding.
As a result, the disc grindstones 24a and 25a rotated at a predetermined speed move along the gantry frame 26 while being pressed against the work rolls WR1 to WR14, and the non-wear area determined to require the grinding is ground. Is done. At this time, it goes without saying that the grinding mechanism 24, 25 and the housing 21 do not interfere with each other so as to grind the non-wear region.
[0051]
In the rolling shift amount setting means 18, for example, after the grinding instruction signal GS is output by the grinding instruction means 17, the grinding time calculated by the rolling interval adjusting means 15 has elapsed, and the operation of the grinding mechanisms 24 and 25 is performed. After confirming the completion, the rolls signal WR2 for moving the work rolls WR1 to WR14 to a position where the next finish-rolled sheet bar 11 can be appropriately finish-rolled is used as the work rolls WR1 to WR14 for which the grinding has been completed. Output to. Thereby, the work rolls WR1 to WR14 move to 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 the flowchart of FIG.
[0053]
First, in the first step S1, the contact pressure calculation means 13 stands by until the roll information and the material to be rolled are input, and when input, the process proceeds to step S2.
In step S2, the calculation pressure calculation means 13 calculates the size of the non-wear area of the work rolls WR1 to WR 14 based on the information input in step S1, and the calculated contact pressure in the non-wear area. Is calculated.
[0054]
Next, in step S3, the grinding necessity determination unit 14 determines whether or not the contact pressure calculated in step S2 is larger than a predetermined threshold value. As a result of this determination, when it is determined that the contact pressure is equal to or lower than a predetermined threshold value and it is determined that grinding of the non-wear region is not necessary, the processing for grinding is stopped. On the other hand, if it is determined that the contact pressure is greater than the predetermined threshold value and it is determined that grinding of the non-wear area is necessary, the process proceeds to step S4.
[0055]
And in step S4, the rolling space | interval adjustment means 15 calculates the grinding time of the non-wearing area | region determined that grinding was required by step S3. A specific process for calculating the grinding time will be described later.
[0056]
Next, in step S5, the rolling interval adjusting means 15 is grinding the non-abrasion region by the sheet bar 11 to be finish-rolled next based on the current position of the sheet bar 11 to be finish-rolled next. It is determined whether or not it is conveyed to the finish rolling mill 4 in the meantime.
[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, if 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]
And in step S6, the rolling space | interval adjustment means 15 outputs the operation delay signal ODS to the heating furnace 2, the rough rolling mill 3, and the speed control apparatus 8, and until the time according to the operation delay signal ODS passes, The sheet bar 11 that is finish-rolled is prevented from being conveyed to the finish-rolling machine 4. Thereby, for example, it is prevented that the conveyance speed of the slab 10 and the sheet bar 11 is increased from the current value to operate.
[0059]
Next, in step S7, the grinding shift amount setting means 16 outputs a roll shift signal RS1 to the work rolls WR1 to WR14 that perform grinding, and the non-wearing region determined to require grinding in step S3, The work rolls WR1 to WR14 are moved to a position where they can be ground by the grinding mechanisms 24 and 25.
[0060]
Next, in step S8, the grinding instruction means 17 outputs a grinding instruction signal GS to the grinding mechanisms 24 and 25 to grind the non-abrasion area determined to require the above grinding.
[0061]
Next, in step S9, the rolling shift amount setting means 18 stands by until the grinding is completed, and when the grinding is completed, the process proceeds to step S10. Note that, as described above, whether or not this grinding is finished is determined by the grinding time calculated in step S4 after the grinding instruction signal GS is output in the process of step S8 and the grinding mechanism. What is necessary is just to confirm by confirming that operation | movement of 24 and 25 was complete | finished.
[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 that have been ground, to the position where the next finish-rolled sheet bar 11 can be appropriately finish-rolled. The work rolls WR1 to WR14 are moved.
[0063]
Next, the grinding time calculation process in step S4 of FIG. 7 will be specifically described with reference to the flowchart of FIG.
[0064]
First, in the first step S21, an instruction is given to perform processing with the rotation speed of the work rolls WR1 to WR14 to be ground set to a specified value (for example, rated rotation speed). In the following description, this specified value is referred to as roll rotation speed N.
[0065]
Next, in step S22, an instruction is given to perform processing with the rotational speed of the disc grindstones 24a and 25a set to the maximum value (for example, the rated rotational speed). In the following description, this maximum value is referred to as a grindstone rotational speed M.
[0066]
Next, in step S23, the traversing speed of the grinding mechanisms 24 and 25a is calculated. In the following description, this speed is referred to as a grindstone traverse speed U. And this whetstone traversing speed U is calculated by, for example, the following (formula 1).
[0067]
Grinding wheel traverse speed U [mm / sec] = MIN (Maximum traverse speed based on equipment constraints, max traverse speed based on traverse constraints) (1 set)
That is, the grindstone traverse speed U is a smaller one of the maximum value of the traverse speed based on the facility constraint and the maximum value of the traverse speed based on the traverse constraint.
[0068]
In the above, the maximum value of the traversing speed based on the equipment constraints is the traversing speed of the grinding mechanisms 24 and 25a when the equipment capacity is utilized to the maximum, and is a predetermined value determined by the equipment capacity.
[0069]
The maximum value of the traversing speed based on the traversing constraint is 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 wrinkled. Yes, for example, a value calculated by the following (Formula 2).
Maximum value of the traverse speed based on the traverse constraint [mm / sec] = predetermined constant based on the traverse constraint × roll rotational speed N [rpm] ÷ 60 (2 formulas)
[0070]
Next, in step S24, it is instructed to perform processing using one end in the axial direction of the non-wear region determined to be ground in step S3 of FIG. 7 as described above as a grinding start point (grinding point).
[0071]
Next, in step S25, the pressing force of the disk grindstones 24a and 25a when the grinding start point (grinding point) is ground is calculated. In the following description, this pressing force is referred to as a grindstone pressing force F. And this grindstone pressing force F is calculated by the following (Formula 3), for example.
[0072]
Grinding wheel pressing force F [N] = g (roll rotational speed N, grinding wheel rotational speed M, grinding wheel transverse speed U, grinding depth) (3 formulas)
That is, the grindstone pressing force F is calculated by a predetermined formula using the roll rotation speed N, the grindstone rotation speed M, the grindstone traverse speed U, and the grinding depth as parameters. In addition, the said grinding depth is the depth of the non-wearing area | region calculated by the contact pressure calculating means 13 in step S2 of FIG. 7 mentioned above, for example.
[0073]
Next, in step S26, it is determined whether or not the grindstone pressing force F calculated in step S25 is within the control range. As a result of this determination, if the grindstone pressing force F is not within the control range, the process proceeds to step S32 described later. On the other hand, when the grindstone pressing force F is within the control range, the process proceeds to step S27, and whether or not the processing performed on the grinding start point (grinding point) satisfies a condition for satisfactory grinding. Is determined using the following (Equation 4).
[0074]
Conditions for good grinding = f (roll rotational speed N, grinding wheel rotational speed M, grinding wheel pressing force F) (4 formulas)
That is, in step S26, when the value determined by a predetermined formula using the roll rotation speed N, the grindstone rotation speed M, and the grindstone pressing force F as parameters is larger than a predetermined threshold, grinding cannot be performed satisfactorily. And the process proceeds to step S32 described later.
[0075]
On the other hand, when a value determined by a predetermined formula using the roll rotation speed N, the grindstone rotation speed M, and the grindstone pressing force F as a parameter is equal to or less than a predetermined threshold, 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 using a position shifted by one step (predetermined distance) in the axial direction from the grinding start point (grinding point) as a new grinding point.
[0077]
Next, in step S29, it is determined whether or not the new grinding point instructed in step S28 is the grinding completion point, and the processing for the non-wear region determined to require grinding is completed.
[0078]
If the result of this determination is that the new grinding point is not a grinding completion point, the process returns to step S25, and processing for the new grinding point instructed in step S28 is executed. On the other hand, if the new grinding point is the grinding completion point, it is determined that if the grinding is performed at the grinding wheel traverse speed U calculated in step S23, good grinding can be performed without reducing the grinding efficiency, and the process proceeds to step S30.
[0079]
And in step S30, it sets so that it grinds with the grindstone traverse speed U computed at step S23.
Next, in step S31, the grinding time of the non-abrasion region determined to require grinding is calculated using the following (formula 5).
[0080]
Grinding time = (peripheral length of work roll to be ground / grinding wheel traverse speed U) + conveying time of grinding mechanism (5 types)
In the above (Formula 5), the driving time of the grinding mechanism is the time required to transport the grinding mechanisms 24, 25 waiting at a predetermined position to the grinding start point, and the grinding mechanism 24 after the grinding is completed. , 25 is a time including a time required for transporting to the predetermined position.
[0081]
As described above, if it is determined in step S26 that the grindstone pressing force F is not within the control range, and if it is determined in step S27 that the conditions for satisfactory grinding are not satisfied, Proceed to S32.
[0082]
In step S32, it is determined whether or not the currently instructed grindstone rotation speed M is greater than a predetermined lower limit value. As a result of this determination, if the currently designated grindstone rotational speed M is larger than a predetermined lower limit value, the process proceeds to step S33, and the predetermined rotational speed is subtracted from the currently designated grindstone rotational speed M to obtain a new one. The grindstone rotational speed M is calculated. And it returns to step S24 and performs the process after step S24 mentioned above again using the said new grindstone rotational speed M. FIG. In this case, it goes without saying that in step S25 and step S27, arithmetic processing is performed using the new grindstone rotational speed M calculated in step S33.
[0083]
If it is determined in step S32 that the currently instructed grindstone rotational speed M is equal to or less than the predetermined lower limit value, the process proceeds to step S34, and the predetermined speed is subtracted from the currently instructed grindstone traverse speed U. A new whetstone traverse speed U is calculated. And it returns to step S24 and performs the process after step S24 mentioned above using the said new grindstone traverse speed U again. In this case, it goes without saying that in step S25 and step S30, calculation processing is performed using the new grinding wheel traverse speed U calculated in step S34.
[0084]
Note that the grinding instruction signal GS output to the grinding mechanisms 24 and 25 in the process of step S8 in FIG. 7 described above is the grindstone rotation speed M, the grindstone traverse speed U, and the grindstone pressing determined in the process in the flowchart of FIG. It is generated based on the force F. That is, the grinding mechanisms 24 and 25 perform grinding with the grindstone rotation speed M, the grindstone traverse speed U, and the grindstone pressing force F determined by the processing in the flowchart of FIG.
[0085]
The control operation by the grinding controller 9 described above can be realized by using a computer system as shown in FIG.
FIG. 9 is a block diagram showing an example of the configuration of a computer system arranged in the grinding control device 9.
In FIG. 9, a computer system 90 includes a CPU 91, a ROM 92, a RAM 93, a keyboard controller (KBC) 95 for a keyboard (KB) 94, a CRT controller (CRTC) 97 for a CRT display (CRT) 96 as a display unit, and the like. The disk controller (DKC) 100 of the hard disk (HD) 98 and the flexible disk (FD) 99 and the network interface controller (NIC) 102 for connection to the network 101 can communicate with each other via the system bus 103. Connected configuration.
[0086]
The CPU 91 comprehensively controls each component connected to the system bus 93 by executing software stored in the ROM 92 or HD 98 or software supplied from the FD 99.
That is, the CPU 91 performs a control for realizing an operation to be described later by reading a processing program according to a predetermined processing sequence from the ROM 92, the HD 98, or the FD 99 and executing it.
[0087]
The RAM 93 functions as a main memory or 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 editing file, a user file, a network management program, a predetermined processing program in the present embodiment, and the like.
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 counterpart work rolls WR1 to WR14 disposed opposite to each other is estimated. When the estimated pressure becomes larger than a predetermined threshold value, the non-wear region is shifted to a position where grinding can be performed by the grinding mechanisms 24 and 25, so that the work rolls WR1 to WR1 are ground. Until a large pressure is applied, it becomes possible to continue the operation without grinding, and it is possible to prevent overgrinding of the work rolls WR1 to WR14. Therefore, the work rolls WR1 to WR14 can be efficiently ground, and the reassignment 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. If it does in this way, due to restrictions, such as a shape of a material to be rolled (sheet bar), work rolls WR1-WR14 cannot be moved freely in an axial direction and cannot be ground, and work rolls WR1-WR14 of forever There is a possibility that the non-wear area cannot be ground.
[0091]
In contrast, in the present embodiment, the grinding time of the work rolls WR1 to WR14 is estimated, and then the sheet bar 11 to be finish-rolled is conveyed to the finish rolling mill 4 with a delay of a predetermined time equal to or longer than the grinding time. Thus, 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. Thereby, the non-wearing area | region of the work rolls WR1-WR14 can be ground reliably, without interrupting the operation for forming the strip 12. FIG.
[0092]
(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the first embodiment described above, grinding is performed between rolling operations. However, in this embodiment, grinding is performed during the rolling operation, and this embodiment and the first described above. This embodiment differs from this embodiment only in a part of the control operation in the grinding control device. Therefore, the same parts as those of the first embodiment are denoted by the same reference numerals as those shown in FIGS. 1 to 9, and detailed description thereof is omitted.
[0093]
Similarly to the grinding control device 9 of the first embodiment shown in FIG. 1, the grinding control device of the present embodiment also has a contact pressure calculation means 13, a grinding necessity determination means, a grinding shift amount setting means, Grinding instruction means 17 and rolling shift amount setting means are provided. However, the grinding control device of the present embodiment does not have the rolling interval adjusting means 15 that the grinding control device 9 of the first embodiment has. Moreover, the content of the processing performed by the grinding necessity determination means, the grinding shift amount setting means, and the rolling shift amount setting means is different from that of the grinding control device 9 of the first embodiment. The contents of processing performed by these means will be described below.
[0094]
First, the grinding necessity determination means determines whether or not the non-abrasion region needs to be ground by determining whether or not the contact pressure calculated by the contact pressure calculation means 13 is larger than a predetermined threshold value. , And the grinding time of the non-abrasion region 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 in the finish rolling is completed, and when it is determined that the grinding is completed, the grinding operation is performed. In this determination, for example, the finish rolling end time can be calculated based on the length of the strip during the finish rolling and the conveyance speed, and the grinding can be completed before the calculated finish rolling end time. It may be determined based on the calculated grinding time.
[0096]
Further, the grinding shift amount setting means moves the work rolls WR1 to WR14 so that the non-wear region determined to be ground by the grinding necessity judgment means is a position where the grinding mechanisms 24 and 25 can grind. Even if it carries out, it will be determined whether the finish rolling of the sheet bar 11 can be performed appropriately.
[0097]
This determination may be performed, for example, by determining whether or not 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 so that the non-abrasion region determined to require grinding reaches a position where the grinding mechanisms 24 and 25 can grind.
[0099]
The operation of the grinding shift amount setting means at this time is to output a roll shift signal RS1 to the corresponding work rolls WR1 to WR14 in the same manner as the grinding shift amount setting means 16 of the first embodiment described above. This can be done by
[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 a position where the finish-rolled sheet bar 11 can be appropriately finish-rolled.
[0101]
The completion of finish rolling may be performed, for example, by detecting the rear end of the finish-rolled strip 12 on the exit side of the finish rolling mill 4. Moreover, the operation | movement when moving the work rolls WR1-WR14 is similar to the rolling shift amount setting means 18 of 1st Embodiment mentioned above, The roll shift signal RS2 is sent to the work rolls WR1-WR14 by which grinding was complete | finished. This may be done by outputting.
[0102]
Next, a specific operation of the grinding control apparatus will be described with reference to the 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 inputted, and when inputted, the process proceeds to step S42, and step S2 shown in FIG. Similarly, the contact pressure in the non-wear region of the work rolls WR1 to WR14 is calculated.
[0103]
Next, in step S43, the grinding necessity determination means determines whether or not the contact pressure calculated in step S42 is greater than a predetermined threshold value. As a result of this determination, when it is determined that the contact pressure is equal to or lower than a predetermined threshold value and the grinding of the non-abrasion region is unnecessary, the processing for grinding is terminated. On the other hand, if it is determined that the contact pressure is greater than the predetermined threshold and grinding of the non-wear area is necessary, the process proceeds to step S44.
[0104]
Next, in step S44, the grinding necessity determination means calculates the grinding time for the non-wear region determined to be ground in step S43. In addition, the specific process at the time of calculating this grinding time is the same as the process which the rolling space | interval adjustment means 15 mentioned above performs (refer step S4 of FIG. 7, FIG. 8).
[0105]
Next, in step S45, the grinding necessity determination unit determines whether or not the grinding can be completed before finishing rolling of the strip that is currently finish-rolled. As a result of this determination, if it is determined that 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 so that the non-wear area determined to be ground in step S43 is a position where the grinding mechanisms 24 and 25 can grind. Even if it is made, it will be determined whether the finish rolling of a strip can be performed appropriately.
[0107]
As a result of this determination, if it is determined that the finish rolling of the strip cannot be performed properly, the processing for grinding is stopped. On the other hand, if it is determined that the finish rolling of the strip can be performed appropriately, the process proceeds to step S47.
[0108]
Then, in step S47, the grinding shift amount setting means determines that the work rolls WR1 to WR14 until the non-wear area determined to be ground in step S43 reaches a position where it can be ground by the grinding mechanisms 24 and 25. Move.
[0109]
Next, in step S48, as in step S8 shown in FIG. 7, the grinding mechanisms 24 and 25 are controlled so as to grind the non-wear area determined to require grinding. Thereby, the non-abrasion area | region determined that the said grinding is required is ground.
[0110]
Next, in step S49, the rolling shift amount setting means waits until the finish rolling is completed, and if it is determined that the rolling has been completed, the process proceeds to step S50, where the rolling shift amount setting means performs the sheet bar 11 to be finish rolled next. The work rolls WR1 to WR14 are moved to positions where the finish roll can be appropriately rolled.
[0111]
As described above, in this embodiment, in order to grind the work rolls WR1 to WR14, when it is determined that the strip can be appropriately finished and rolled even if the work rolls WR1 to WR14 are moved in the axial direction. Since the work rolls WR1 to WR14 are ground during 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]
(Other embodiments of the present invention)
In order to operate various devices to realize the functions of the above-described embodiments, program codes of software for realizing the functions of the above-described embodiments are provided to an apparatus connected to the various devices or a computer in the system. What is implemented by operating the various devices according to a program supplied and stored in a computer (CPU or MPU) of the system or apparatus is also included in the scope of the present invention.
[0113]
In this case, the program code itself of the software realizes the functions of the above-described embodiments, and the program code itself and means for supplying the program code to the computer, for example, the program code are stored. The recorded medium constitutes the present invention. As a recording medium for storing the 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, or the like can be used.
[0114]
Further, by executing the program code supplied by the computer, not only the functions of the above-described embodiments are realized, but also the OS (operating system) or other application software in which the program code is running on the computer, etc. Such a program code is also included in the embodiment of the present invention even when the functions of the above-described embodiment are realized in cooperation with the embodiment.
[0115]
Further, after the supplied program code is stored in the memory provided in the function expansion board of the computer or the function expansion unit connected to the computer, the CPU provided in the function expansion board or function expansion unit based on the instruction of the program code Etc. perform part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.
[0116]
【The invention's effect】
As described above, according to the present invention, when grinding a work roll for rolling a strip-shaped steel sheet that has been subjected to a predetermined treatment, the predetermined areas of the work roll are arranged to face each other. The pressure received when it comes into contact with the opposite work roll is estimated, and when the estimated pressure becomes larger than a predetermined threshold, the work roll is moved in the axial direction to set a predetermined area of the work roll. Since the grinding is performed, the work roll can be prevented from being ground until just before the rolling is disturbed. As a result, overgrinding of the work roll can be prevented as much as possible, and the operation can be continued without causing any trouble in rolling. Therefore, it becomes possible to lengthen the reassignment interval of the work rolls as much as possible, so that the productivity of the strip steel plate can be improved and the cost can be reduced.
[0117]
According to another aspect of the present invention, the time required for grinding a predetermined region of the work roll is calculated, and the strip steel sheet is conveyed to the work roll with an interval longer than the calculated time. As a result, the predetermined area of the work roll can be ground between rolling operations. Thereby, the predetermined area | region of the said work roll can be ground reliably, without interrupting operation.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an example of a schematic configuration of a hot rolling facility according to a first embodiment of this invention.
FIG. 2 is a diagram illustrating an example of a configuration of a work roll according to the first embodiment of this invention.
FIG. 3 is a diagram illustrating an example of a state in which a work roll moves in the axial direction according to the first embodiment of this invention.
FIG. 4 is a diagram illustrating an example of a state when a work roll is ground according to the first embodiment of the present invention.
FIG. 5 is a diagram showing characteristics used in calculating a wear coefficient of a work roll in the first embodiment of the present invention.
FIG. 6 is a characteristic diagram showing the first embodiment of the present invention and comparing the calculated value of the wear amount in the roll barrel direction with the actually measured value.
FIG. 7 is a flowchart illustrating processing in the grinding control apparatus according to the first embodiment of this invention.
FIG. 8 is a flowchart illustrating a specific process in the grinding control device when calculating the grinding time according to the first embodiment of this invention.
FIG. 9 is a block diagram illustrating an example of a configuration of a computer system disposed in a grinding control device according to the first embodiment of this invention.
FIG. 10 is a flowchart illustrating processing in the grinding control apparatus according to the second embodiment of this 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 adjustment 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 Disc grinding wheel
F1-F7 rolling stand
WR1-WR14 work roll

Claims (10)

A work roll online grinding apparatus for grinding a work roll for rolling a strip-shaped steel sheet conveyed by being subjected to a predetermined treatment,
A work roll grinding device for grinding the work roll online;
Grinding control means for grinding a predetermined area of the work roll by the work roll grinding device,
The grinding control means estimates a pressure received when a predetermined area of the work roll comes into contact with a counterpart work roll disposed opposite to each other, and the estimated pressure is larger than a predetermined threshold value. Further, the work roll online grinding apparatus is characterized in that the work roll is moved in the axial direction and a predetermined area of the work roll is ground by the work roll grinding apparatus. The grinding control means calculates the time required to grind a predetermined area of the work roll, and causes the work roll to transport the strip steel sheet with an interval longer than the calculated time. The work roll on-line grinding apparatus according to claim 1, wherein the work roll is on-line grinding. 3. The work roll on-line grinding apparatus according to claim 1, wherein the grinding control means estimates the pressure based on a wear amount of the work roll. The work roll online grinding 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 rolled surface of the work roll. A work roll online grinding method for grinding a work roll for rolling a strip-shaped steel sheet that has been subjected to a predetermined treatment and is rolled online,
The pressure received when the predetermined area of the work roll comes into contact with the counterpart work roll disposed opposite to each other, and when the estimated pressure is greater than a predetermined threshold, the work roll is An on-line grinding method for a work roll, wherein the predetermined area of the work roll is ground by moving in an axial direction. 6. The time required for grinding a predetermined area of the work roll is calculated, and the work roll is transported by the work roll with an interval longer than the calculated time. The on-line grinding method for work rolls described in 1. 7. The work roll online grinding method according to claim 5, wherein the pressure is estimated based on a wear amount of the work roll. The work roll online grinding 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 rolled surface of the work roll. A computer program for causing a computer to execute an on-line grinding method for a work roll for grinding a work roll for rolling a strip-shaped steel sheet conveyed after being subjected to a predetermined process,
When the predetermined area of the work roll comes into contact with the other work roll arranged opposite to each other, the pressure received is estimated, and when the estimated pressure is larger than a predetermined threshold, the work roll is A computer program for causing a computer to move in an axial direction and to grind a predetermined region of the work roll by a work roll grinding apparatus for grinding the work roll online. 10. A computer-readable recording medium on which the computer program according to claim 9 is recorded.

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