JPH06344012A - Rolling roll online grinding method and device and rolling system for online roll grinding - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an on-line roll grinding method and apparatus capable of recovering the initial profile and extending the roll life without interrupting the rolling operation. [Structure] Work rolls 1a, b to 4a, b of each stand
Is measured by measuring devices 11a and 11b. The grinding control means 12 compares the measured profile with the target profile stored in the storage means 13 in advance, and when the wear amount of the work roll is smaller than the allowable value for bending control and exceeds the predetermined amount. First, the roll grinders 10a and 10b incorporated in the respective stands are controlled so as to grind this predetermined amount during rolling. As a result, the non-contact portion of the work roll is ground. On the other hand, during the idle time of the rolling mill, grinding is performed according to the target profile including the contact portion. This grinding timing becomes unconditional when the wear amount exceeds the allowable value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-line grinding method for rolling rolls, and more particularly to the timing of grinding the contact portion and non-contact portion of a rolling roll.

[0002]

2. Description of the Related Art Rolls for rolling incorporated in a rolling mill are
After a certain amount of rolling or when the degree of deterioration is great, the rolling is interrupted and replaced with a new roll. Stopping the rolling operation during the roll change is an obstacle to improving the production efficiency.

Recently, a roll grinder is installed in a rolling line to grind the steps generated on a rolling roll online.
Various proposals have been made to modify and extend the roll life and reduce the number of roll changes, and some have been implemented. Most of them perform smooth grinding during idle time when the rolled material is not caught in the roll.

By the way, the roll profile at the time of rolling is obtained by the synergistic effects of the crown shape of the rolling roll, the deformation of the material to be rolled by heat, and the bending force of the roll bending apparatus.

Therefore, in the online roll grinding during rolling, it is necessary to consider not only the smooth grinding but also the change of the roll crown. One such method is the "online curved surface grinding method for rolling rolls" disclosed in Japanese Patent Laid-Open No. 58-151903.

In this example, the initial profile of the rolling roll that is biting the rolled material is stored, and the profile changed according to the progress of rolling is corrected to the initial profile at any time or periodically so as to correct the initial profile. Are in control.

[0007]

In the above-mentioned prior art, it is possible to cope with a change in roll crown by maintaining the initial profile of the rolling roll during biting. But,
Since there is no consideration for the grinding timing or the grinding range,
There are many practical problems in terms of grinding work efficiency and grinding accuracy.

It is an object of the present invention to provide an on-line roll grinding method and apparatus capable of recovering the initial profile and extending roll life by efficient grinding in parallel with rolling.

Another object of the present invention is to provide a rolling control system with high productivity by on-line roll grinding without rolling interruption.

[0010]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems, the present invention, on the one hand, addresses the repair of roll crowns and, on the other hand, is suitable for the contact / non-contact parts of work rolls. This can be achieved by considering the timing.

That is, in the rolling roll on-line grinding method in which the work roll is ground in the built-in state, the profile of the work roll is periodically measured, and the measured profile is compared with the target profile (initial crown) stored in advance. However, each time the wear amount of the work roll exceeds a predetermined amount smaller than the allowable value of the bending control, the predetermined amount is ground during rolling.

Although the range of the work roll to be ground by this is mainly the non-contact part, the grinding range may be limited to the vicinity of the boundary with the non-contact part to ensure the safety of the grinding during the rolling operation.

Further, it is characterized in that during the non-rolling (idle time), grinding is performed so as to obtain a target profile. The grinding timing may be set when the wear amount exceeds the allowable value. The range of the work roll to be ground by this includes the contact portion, and is performed over the entire range of the work roll. However, only the contact portion and the vicinity of the boundary may be subjected to high-precision grinding with the target profile, and the other may have low precision so as to be substantially along the profile.

Further, in a rolling system equipped with a roll bending adjusting device for controlling the bending amount according to the wear amount of the work roll and an online roll grinding device for grinding the wear of the work roll in the assembled state, the rolling system is actually measured during rolling. Determine the roll wear amount from the profile of the work roll, and output the bending control amount for correcting the roll deformation due to this wear amount to the roll bending adjustment device, and the wear amount is a controllable allowable value by the roll bending adjustment device. It is characterized by comprising a control device for determining whether or not the value exceeds the allowable value, and if not, controlling to grind a predetermined amount smaller than the allowable value while continuing rolling.

[0015]

The non-contact portion of the work roll may have low grinding accuracy, and the predetermined amount of grinding can be sufficiently dealt with even during rolling. On the other hand, since the range of the contact portion directly affects the material shape, it is necessary to perform highly accurate grinding based on the target profile, and it is difficult to deal with it during non-rolling (idle time).

According to the present invention, the non-contact part (or the non-contact part including the vicinity of the boundary with the contact part) has a predetermined level difference from the contact part (eg, grinding amount of the grinding machine once / predetermined time). )
Since the grinding is performed in parallel with the rolling operation every time, the change in the crown amount during rolling can be maintained within the controllable range of the roll bending adjustment device.

As a result, the time to reach the control limit of the bending adjusting device can be greatly extended compared to the case where the non-contact part is not ground during rolling. Therefore, high-precision grinding including the roll contact part is performed during idle time. All you have to do is execute it.

It should be noted that it is not always necessary to set the grinding ranges of the contact portion and the non-contact portion in the above. That is, the predetermined amount of grinding during rolling is consequently limited to the non-contact portion and the vicinity of the boundary. On the other hand, profile grinding during non-rolling covers the entire area according to the repair profile of the most worn contact portion. Of course, it is also possible to limit the range mainly to the contact portion and its vicinity.

According to the present invention as described above, it is possible to perform online roll grinding in which the initial profile is restored by efficient grinding and the roll life is extended.

Further, the online roll grinding without interruption of the rolling operation and the extension of the roll life can largely contribute to the improvement of the productivity of the rolling system.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be concretely described based on the embodiments shown in the drawings.

FIG. 2 shows a schematic overall configuration of a rolling system to which the present invention is applied. In the present invention, the number of rolling stands is arbitrary, but rolling stands 1 to 4 shown in the figure are each provided with an upper work roll a and a lower work roll b combined with a backup roll. Further, near each rolling stand, plate speed detectors 6-a to 6-e for detecting the plate speed before and after each stand of the rolled material 5 and a plate thickness detector 7 for detecting the plate thickness are provided. -A ~
7-e is provided.

Each value of the plate speed detector 6 and the plate thickness detector 7 is periodically sampled by the data collecting device 8, and the data is sent to the control device 9. The control device 9 performs well-known plate thickness control and shape control, has a control means of a bending adjustment device (not shown) that adjusts the crown of a work roll during rolling, and further has a roll grinding control means according to the present invention. Is added.

FIG. 3 is a schematic view showing the profile (crown) of the roll in the rolling roll. (A) shows an initial crown, and the rolling roll originally has a predetermined crown shape. (B) is a thermal crown deformed by heat absorption from the material to be rolled, (C) is roll deflection due to rolling load, (D) is roll bending due to bending force of a roll bending adjusting device, and these (A) to (D)
The total profile is obtained by the synergy of.

In addition to the above (B) and (C), the actual roll shape during rolling is deformed by uneven wear of the roll surface. The roll bending device also absorbs the deformation caused by the uneven wear, and controls the rolled material to maintain the quality accuracy of a predetermined shape (plate crown). However, if the wear amount exceeds the control limit, the quality of the rolled material deteriorates, so roll grinding and further roll replacement are required.

FIG. 1 shows one embodiment of the on-line roll grinding system of the present invention, showing the overall construction thereof. The roll grinding devices 10a and 10b and the roll profile detectors 11a and 11b respectively include upper work rolls 1a to 4a and lower work rolls 1b to 4b of each stand.
And is installed in a predetermined position so that it can be adjusted.

As will be described later, the roll profile detector 11 is composed of a plurality of measuring probes 110 arranged at a predetermined pitch along the axial length direction of the upper roll and the lower roll, and is periodically sampled by the data collecting device 8. Monkey For the measured value (roll diameter) of each probe, the profile calculation means 121 of the roll grinding control means 12, which is a function of the control device 9, determines the profiles of the upper and lower work rolls of each stand.

The roll grinding control means 12 measures the roll profile during rolling (the biting state of the material to be rolled) at the initial time when there is no or very little wear of the roll, and stores it in the storage means 13 as the target profile. Thereafter, while comparing the measured profile and the target profile of each roll by the profile comparison means 122, the grinding control command output means 123 outputs a grinding command signal to each of the roll grinding devices 10 according to the comparison result.

FIG. 4 is a flow chart showing the processing procedure of roll grinding control according to this embodiment. The profile of the roll is actually measured at a predetermined cycle during rolling (s101). The crown amount of the roll is calculated from this measured profile (s102). Next, it is compared with the stored target profile (s103), and it is determined whether the amount of change in the crown amount exceeds a predetermined allowable value which is a controllable range of the roll bending adjustment device (s104). This allowable value is set with a sufficient margin with respect to the control limit of the bending adjustment device.

Next, it is determined whether the amount is within the allowable value but exceeds the predetermined amount (s105). This predetermined amount is set in consideration of the grinding ability of the grinding device 10 and the roll wear rate. For example, the grinding amount is a value that can be searched by the grinding device 10 once or in a predetermined time.

When the amount exceeds the predetermined amount, the amount corresponding to the predetermined amount is ground during rolling from the measured profile surface of the non-contact portion in each case (s106). In this case, a grinding range mainly including the non-contact part of the roll is designated, and the grinding device in that range is operated. Even if the entire grinding machine is operated without specifying the grinding range, the amount of grinding from the profile surface of the non-contact part does not reach the contact part that is abraded more than the specified amount. Only the non-contact part and its vicinity are ground.

On the other hand, if the allowable value is exceeded in s104, it is determined whether the rolling mill is in idle time (s10
7) If it is idle time, grinding based on the target profile is performed (s108). In this case, the roll contact portion and the vicinity of the boundary may be highly accurate target profile grinding, and the others may be low accuracy grinding substantially conforming to the target profile. In addition, s
The grinding of 108 may be always performed during the idle time or the idle time of a predetermined time interval regardless of whether or not the allowable value is exceeded.

Since the grinding wheel is originally arranged outside the biting position of the material to be rolled, the grinding of the roll contact portion can theoretically be performed even during rolling. However, since the contact part directly affects the quality of the rolled material, it is desirable that the rolling mill is in idle time in order to secure the grinding accuracy. Therefore, when grinding, it is confirmed from the output of the plate speed detector 6 that the non-rolling is being performed.

FIG. 5 shows changes in the roll profile (solid line) and the grinding profile (hatched part) due to wear. The dotted line is the initial profile.

(A) is the initial profile, (b) is the profile worn by rolling, and hc is the amount of wear in the central part. The wear amount hc _{1 in} this example is smaller than the control allowable value h _B of the bending adjustment device. h _K is the grinding amount, usually 1 of h _B
/ N (n is a positive number). (C) is a profile after the shaded part of (b) is ground, and the wear amount is hc ₁ -h
_It has decreased to _K. In (d), the wear amount is again hc ₂ > h
_Then , the shaded portion h _K is ground.

While (a) to (d) are being rolled, (e) to (f) are examples of grinding during idle time, in which the wear amount hc ₃ exceeds the allowable value h _B. Grinding amount is hc ₃
Therefore, curved surface grinding based on the target profile is performed.

As described above, according to this embodiment, if the step difference between the roll contact portion and the non-contact portion due to wear is constant,
The grinding device 10 is operated each time during rolling to remove this step. Therefore, since the time to reach the control limit of the bending apparatus is extended, the contact portion can be ground sufficiently in the idle time during which the material to be rolled is interrupted. And at least for idle time grinding,
Since it is corrected by curved surface grinding based on the target profile, the roll life that can maintain rolling accuracy can be greatly extended.

FIG. 6 shows a plurality of grindstones 1 in the axial direction of the roll.
01a to h are arranged. The shape of each grindstone is, for example, a parallelogram as shown in a partially enlarged view,
There is no grinding residue between the grindstones because the grinding areas of each other overlap.

FIG. 7 shows a drive circuit for operating each grindstone of FIG. The respective sets of the grindstones 101b to 101h located symmetrically with respect to the grindstone 101a in the central portion are simultaneously operated by the same grinding command signal. The grinding command signal is
From the roll grinding control device 12, the above step s10
In No. 6, a predetermined amount was ground from the contact portion profile, and s
At 108, a command to restore the target profile is output.

Since a predetermined amount of grinding during rolling is performed on the extension surface of the profile of the non-contact portion that is actually measured, the grinding range is limited to the vicinity of the non-contact portion and the boundary portion. Only need to operate. Of course, even if all the whetstones are operated at the same time, the grinding result is almost the same.

In the grinding during the idle time, the profile according to the target profile is compared with the profile during the grinding, and the entire region of the roll is ground according to the target profile. In this case, highly accurate grinding may be performed only on the contact portion including the boundary portion, and the non-contact portion may be less accurate than the contact portion.

Each whetstone is pressed against the roll surface by the operating cylinder 102 to perform grinding. Cylinder 10
2 operates by magnetic force, hydraulic pressure, pneumatic pressure, etc. For example, in the case of a magnetic solenoid, current is supplied from the power supply line 105 while the contact 104a is on by the output of the control command signal 103a, and the operation cylinder 102a presses the grindstone 101a against the roll surface.

Although the grindstones 101 are densely arranged in the roll axis direction in the above example, they may be arranged at a predetermined pitch and may be ground while moving between them. Further, the measurement probe 111 and the grindstone 101 may be arranged integrally.

[0044]

According to the present invention, the non-contact portion which does not require precision is ground little by little during rolling, and the time required to reach the control limit by the bending adjusting device is extended. Therefore, the grinding frequency of the contact portion according to the target profile is extended. Is reduced and grinding time is also reduced, so it is possible to deal with it during idle time.

According to this, since it is possible to perform the online grinding for maintaining the target profile for a long time, the life of the roll is extended and the reassembling cycle is extended. Further, since the grinding is performed in parallel with the rolling operation and the rolling is not interrupted, the productivity of the rolling system can be improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a roll grinding control device according to the present invention.

FIG. 2 is a schematic configuration diagram of a rolling system to which the online roll grinding method of the present invention is applied.

FIG. 3 is an explanatory view conceptually showing a profile of a rolling roll.

FIG. 4 is a flowchart showing a processing procedure of roll grinding control performed in parallel with a rolling operation.

FIG. 5 is a schematic diagram for explaining a roll wear situation and a grinding situation.

FIG. 6 is a layout view of a grinding wheel.

FIG. 7 is a connection diagram showing a drive circuit for a grinding wheel.

[Explanation of symbols]

1 to 4 ... Work roll, 5 ... Rolled material, 6 ... Speed detection device, 7 ... Plate thickness detection device, 8 ... Data collection device, 9 ... Rolling control device, 10 ... Roll grinding device, 11 ... Profile measuring device, 12 ... Roll grinding control device, 13 ... Storage device, 101 ... Grinding stone, 102 ... Cylinder.

Claims (8)

[Claims] 1. An on-line grinding method for a rolling roll, which grinds a work roll in a built-in state, wherein a profile of a work roll is measured at a predetermined cycle, and the measured profile and a target profile (initial crown) stored in advance are measured. In comparison, when the wear amount of the work roll exceeds a predetermined amount smaller than a predetermined allowable value for bending control, the non-contact part of the work roll or a range mainly composed of the non-contact part is set to the above-mentioned range. An online grinding method for a rolling roll, which is characterized by grinding only a fixed amount. 2. The on-line grinding method for a rolling roll according to claim 1, wherein the predetermined allowable value is smaller than a control limit of bending control, and the predetermined amount corresponds to a grinding amount of one time or a fixed time. 3. The target profile according to claim 1, wherein when the wear amount exceeds the predetermined allowable value, the contact portion or the entire range of the work roll is restored to the target profile during non-rolling (idle time). On-line grinding method for rolling rolls, characterized in that grinding is performed. 4. The on-line grinding method for a rolling roll according to claim 1, 2 or 3, wherein the wear amount of the work roll is obtained as a wear amount of a central portion or a roll crown change amount. 5. An online grinding method for a rolling roll, which grinds a work roll in a built-in state, measures a profile of a work roll at a predetermined cycle, compares the measured profile with a target profile stored in advance, and On-line grinding of a rolling roll characterized in that when the amount of wear of the roll exceeds a predetermined amount smaller than a predetermined allowable value for bending control, the predetermined amount is ground during rolling, and the target profile is ground during non-rolling. Method. 6. An on-line grinding machine for a rolling roll, which incorporates a work roll profile measuring device and a grinding means into a rolling stand, and grinds the work roll according to an actual measurement profile measured during operation. When the wear amount of the work roll exceeds a predetermined amount smaller than a predetermined allowable value for bending adjustment, a non-contact work roll is compared with a storage device that stores the (initial crown) and the target profile and the actual measurement profile. And a non-contact portion, and a grinding control device for controlling so as to grind only a predetermined amount during rolling during the rolling, and an on-line grinding device for a rolling roll. 7. The grinding control device according to claim 6,
When the wear amount of the work roll exceeds the predetermined allowable value, at least the contact portion of the work roll is controlled to be ground based on the target profile during non-rolling (idle time). Online grinding equipment. 8. A rolling system equipped with a roll bending adjusting device for controlling a bending amount according to the wear amount of a work roll and an online roll grinding device for grinding the wear of a work roll in a built-in state, which is actually measured during rolling. Determine the roll wear amount from the profile of the work roll, and output a bending control command to correct the roll deformation due to this wear amount to the roll bending adjustment device, and the wear amount exceeds the allowable value by the roll bending adjustment device. Whether or not it is exceeded, if it is not exceeded, a control command to grind a predetermined amount smaller than the allowable value is output while continuing rolling, and if it is exceeded, grinding based on the target profile is performed during idle time of the rolling mill. Rolling comprising a control device for outputting a control command for performing rolling system.