JPH0155044B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for in-line grinding of rolling mill rolls.

Normally, as the rolling amount of rolling rolls such as hot tandem rolling mills increases, the surface of the work roll (threading part) in contact with the rolled material wears and deforms, and
The surface quality of rolled products is damaged due to foreign matter adhering locally. For this reason, after the rolls are reassembled, the order of sheet threading between the rolls and the next rolls is changed from the wide lot to the narrower lot.
The negative impact on the shape quality of rolled products due to roll wear is minimized. As a result, the rolling schedule is limited, which is an extremely significant constraint on production efficiency.

As described above, when rolled materials of various widths are rolled, the roll surface (profile) in the axial direction of the work roll wears out in a substantially step-like manner. For this reason, a method is used in which the operation is periodically stopped and replaced with a spare roll that has been maintained in advance, and the degraded roll is ground and maintained off-line.

In this case, there is a reduction in production due to the suspension of rolling operations due to roll rearrangement work, and economic losses due to the large amount of labor and time required to transport deteriorated rolls and roll jocks to a grinding and maintenance shop and to remove and install accessories. It has the disadvantage of being large.

As a countermeasure to this problem, various types of online roll grinding means (for example, JP-A-54-131554 and JP-A-Sho 55-1) grind the surface of the work roll while rotating the roll while the roll is still installed in the rolling mill housing. 81007 etc.) have been proposed.

Among these, the one shown in JP-A-54-131554 is
Without directly measuring the roll profile before grinding online and grinding the roll based on the measured value, the grinding table is moved in the roll axis direction based on a pre-formed reference plane in the non-rolling area on both sides of the roll. This is a method of moving and grinding, and aims to obtain a predetermined roll profile while avoiding the effects of roll shaft runout and roll eccentricity due to gaps between the housing and the roll chock, and between the roll chock and the roll shaft. Therefore, for example, it is reasonable to consider the actual profile of the roll, such as the above-mentioned step wear.
It is difficult to set an economical amount of grinding.

Furthermore, JP-A No. 53-81007 discloses a predictive grinding method that grinds rolls online based on the amount of wear predicted before and after online roll grinding, that is, the predicted roll profile. Since the method does not measure

In view of the above-mentioned prior art, an object of the present invention is to provide an in-line grinding method for rolling mill rolls that measures the correct roll shape (axial straightness profile) before and after grinding and obtains a predetermined roll shape with high precision. shall be.

The present invention achieves this objective by measuring the roll shape (straightness profile in the roll axis direction),
Based on this, the grinding body is controlled, and calculations are made while correcting the measured values of multiple shape detection sensors based on the amount of change in roll position determined based on signals from multiple roll position detection sensors. The technical idea is based on the fact that the shape of the roll can be measured through processing without being affected by the rotational error of the roll or the motion error of the measuring device.

Embodiments of the present invention will be described in detail below based on the drawings. FIG. 1 is a plan view schematically showing an upper work roll grinding device that implements the embodiment method of the present invention. As shown in the figure, the work roll 1 is rotatably supported at both ends by roll jocks 2a and 2b, and moves up and down within the housings 3a and 3b, and is also rotated through the mill spindle 4 on the drive side A of the rolling mill. It rotates by being supplied with driving force by a rotational drive device (not shown). A beam 5 disposed between the housings 3a and 3b on the driving side A and the working side B of the rolling mill.
At the top, there is a roll grinding device 7 that includes at least one grinding body 6 that can move forward and backward in the width direction X of the work roll 1 and in the radial direction Y of the work roll 1.
is installed. On the other hand, a beam 8 is provided between the housings 3a and 3b on the opposite side of the roll grinding device 7 with the work roll 1 in between.
The screw shaft 9 has both ends supported by bearings 14a and 14b fixed to the beam 8, and a detector mount 11 is screwed thereto. In this way, the screw shaft 9 is rotated by the drive of the pulse motor 12 via the speed reduction device 13, and the detector mounting base 11 can be moved in the X direction. This detector mounting base 11 has three displacement detectors (roll profile detection sensors) 10 arranged at equal intervals l in the X direction.
a, 10b, and 10c are arranged, and move in the roll axis direction as the detector mounting base 11 moves to detect irregularities of the work roll 1 in the roll axis direction. In addition, two (in some cases, four) displacement detectors (roll position detection sensors) 15a are installed at equal intervals near the outer peripheral surfaces of the roll necks 1a and 1b inside the work roll 1. ,15
b, 15c, and 15d are arranged. That is, as shown in FIG. 2a when this portion is viewed from the left side and FIG. 2b when the same portion is viewed from the right side, the displacement detectors 15a, 15b, 15c, and 15d
The displacement detectors 10a, 10b, 10c and the detector mount 11 or the beam 8 are fixed to pedestals 8a, 8b fixed to the work roll 1 to detect the amount of relative position change between the work roll 1 and the displacement detectors 10a, 10b, 10c and the detector mount 11 or the beam 8. These displacement detectors 10a, 10b, 10c, 15a, 15
b, 15c, and 15d are preferably non-contact types. Further, a plurality of locations (four locations in this embodiment) in the circumferential direction of the outer peripheral surface of one of the roll neck portions 1a and 1b (this embodiment is the case of the drive side A) are provided with a specimen 16a. , 16b, 16
c, 16d are attached, and this test object 16a,
16b, 16c, 16d as position pulse detector 17
By detecting this, the rotational position of the work roll 1 can be detected. Further, a test object 16e is also attached to the roll neck portion 1a, and this test object 16e is attached to the rotation origin pulse detector 1.
8, the rotation origin of the work roll 1 can be detected. The position pulse detector 17 and the rotation origin pulse detector 18 are fixed to the base 8a. Displacement detector 10a, 1
0b, 10c, 15a, 15b, 15c, 15
d, the position pulse detector 17, the rotation origin pulse detector 18, the pulse motor 12, and the grinding body 6 are each connected to an arithmetic processing unit 19. In addition, #1 shown in FIG. 1 is replaced by #1 shown in FIG. 2 a,
Further, #2 shown in FIG. 1 is connected to #2 shown in FIG. 2b, respectively.

The upper work roll grinding device 20 having the above configuration is also attached to the lower work roll section (not shown).

In this embodiment using such a device, in order to measure the profile in the roll axis direction before or after grinding the work roll 1 in-line,
First, while rotating the work roll 1 at an appropriate speed, the pulse motor 12 and screw shaft 9 are rotated based on a predetermined feed amount command (command for each interval l) from the arithmetic processing unit 19. displacement detector 10
a, 10b, and 10c are moved, for example, to the work side B, and the amount of unevenness in the roll axis direction and the amount of change in the roll position are detected using signals from the displacement detectors 15a, 15b as triggers.

At this time, displacement detectors 10a, 10b, 10c
If the moving speed of the displacement detectors 10a,
Data can be sampled while 10b and 10c are continuously moving (without the need for moving or stopping operations).

The amount of change in the roll position, that is, the amount of whirling of the roll shaft, is determined between the housings 3a, 3b and the roll jocks 2a, 2b, and between the roll chocks 2
This is due to the play between a, 2b and the work roll 1.

Next, the amount of unevenness in the roll axis direction is corrected (by proportional calculation method) according to the amount of change in the roll position to obtain sampling data for a set of three displacement detectors 10a, 10b, 10c, and each of the circumferential directions is The data set corresponding to the position (data of a set of three x number of sampling points) is processed by the processing unit 19 to obtain an accurate roll axis without being affected by waviness or pitting in the axial direction of the screw 9. Obtain the directional straightness profile. Therefore, by arbitrarily selecting the movement areas of the displacement detectors 10a, 10b, 10c, the work roll 1
It is possible to easily measure the roll profile of the whole body length or any area of the body.

Here, as described above, three displacement detectors 10a,
Regarding the measuring method using 10b and 10c, please refer to Japanese Patent Application No. 167561/1982, and regarding the measuring method using two displacement detectors, please refer to Japanese Patent Application No. 56-093240.
Each has already been proposed by the applicant.

In this way, after obtaining a highly accurate physical profile of the work roll 1 to be ground or after grinding, a known control device (not shown) (for example, By automatically controlling the amount of cutting and the amount of lateral feed of the grinding body 6 of the roll grinding device 7 using a numerical control device, etc., it is possible to grind to a predetermined profile with high precision. In addition, by knowing the actual profile before grinding, we can respond to the wear condition of the work roll.
Grind to the minimum required profile. For example, temporary grinding is performed to smooth only the stepped worn portion.

As specifically explained above with the examples,
According to the method of the present invention, it is possible to measure the roll straightness profile with high precision before or after grinding a work roll in-line, and also to control the cutting amount and feed amount of the roll grinding device by feeding back the measurement data. As a result, it is possible to easily obtain a predetermined profile with high precision at all times, which eliminates the conventional restrictions on rolling schedules such as determining the order of sheet passing according to the sheet width, and also reduces the interval between roll rearrangements. Extending the length can contribute to improving production efficiency.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing an upper work roll grinding device that implements the embodiment method of the present invention, and FIG.
Figure a is a side view of the displacement detectors 15a and 15c seen from the left side, Figure 2b is the displacement detector 15b,
It is a side view of the part 15d seen from the right side. In the drawing, 1 is a work roll, 2a, 2b are roll jocks, 7 is a roll grinding device, 10a, 10
b, 10c, 15a, 15b, 15c, and 15d are displacement detectors, and 17 is a position pulse detector.

Claims (1)

[Claims] 1. In an in-line grinding device for a rolling mill roll in which the surface of a work roll is ground in-line by a grinding device, the distance between the work roll and the surface of the work roll is By matching the output of a displacement detector that detects the work roll while rotating it with the output of a position pulse detector, etc. that detects the circumferential position of the work roll, the roll position over the circumferential direction of the work roll can be determined. Detects the amount of unevenness on the work roll surface in the corresponding roll axis direction, and also detects the distance between the work roll surface and the roll chock obtained while rotating the work roll of another displacement detector that detects the distance between the work roll surface and the work roll surface at the same position. A straightness profile of the work roll in the roll axis direction is obtained by correcting the amount of unevenness with an output representing the whirling amount of the roll axis of the work roll due to play, and controlling the roll grinding device based on this. A method for inline grinding of rolling mill rolls, characterized by grinding the surface of a work roll.