JPS5852450B2 - Roll Hen Ikenshitsu Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting the displacement of a roll used when manufacturing plates, strips, bars, etc. by rolling metal and non-metallic materials, and particularly relates to a device used for rolling steel. It is an object of the present invention to provide a device that is particularly suitable for detecting the displacement of a roll that is caused to move.

Generally, when rolls are used to plastically deform, eg, roll, a material, it is well known that if the roll profile is not appropriate, proper rolling will not be possible, and products with excellent shape and quality will not be obtained.

Therefore, roll grinding is performed prior to rolling to create a roll profile suitable for rolling the product in question, but the rolls may wear out with use, or if the material to be rolled is hot, it may expand thermally, resulting in profile varies significantly.

Therefore, while the roll is in use, that is, on-line, its profile is detected and appropriate control is performed, such as changing the bending amount of the roll or changing the rolling pitch, in an attempt to obtain a product with a better shape and profile. Although there have been attempts, there are many factors that impede detection, such as vibrations, dust, water droplets, and water vapor, and the reality is that no reliable roll profile detection method has been found online.

Therefore, in order to determine the roll profile, it is sufficient to know the continuous change in the roll diameter along the length direction, but as mentioned above, it is extremely difficult to detect such changes in the roll diameter during rotation. Met.

By the way, for the roll profile, if the roll diameter at one point (for example, the roll center) or multiple points in the length direction of the roll is known, the initial value can be known by a candy approximation calculation. If a device is developed that detects changes in the diameter of an arbitrary point with reference to the initial roll crown, the roll profile can be determined by calculation from that detection device. First, we started developing a roll displacement detection device that detects the amount of change thereafter (hereinafter referred to as displacement amount in the present invention) by setting the initial roll crown, that is, the roll diameter at the completion of roll grinding, as a zero point. As a result of our efforts to develop a highly reliable roll displacement detection device that has good detection accuracy even under adverse conditions and is free from failure over a long period of time, we have devised the device of the present invention. A beam on which two or more water micrometers are attached; A device for movably supporting the beam via a support bearing rotatably attached to a roll chock; A spring support fitting extended to the roll chock, and the metal fitting. a device for pressing the beam in the roll direction, which is fixed to a roll chock and has a spring for pressing the beam at its tip; A beam movement limiting device consisting of a stopper fitting to limit approach; and a roll displacement detecting device consisting of a device for displaying and/or recording a signal from the water micrometer.

The present invention will now be explained in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing displacement detection of an object by a water micrometer 1, and 2 is an object to be measured, such as a roll whose roughness is exaggerated.

Therefore, the water micrometer 1 is connected to the constant pressure water supply pipe 3.
, 3', a differential transformer core 1 mounted on a nozzle body 6 so as to be located inside the differential transformer 5, a spring seat 8 provided on a fixing device (not shown), and the spring. The spring 9 is installed between the seat 8 and the nozzle body 6 and constantly pushes the nozzle body 6 toward the object to be measured 2 with a set pressing force.

By spraying constant pressure water from the nozzle 4 onto the roll 2 in the direction of arrow 10, a reaction force that is inversely proportional to the distance from the roll 2 acts on the nozzle body 6, so the water micrometer 1 is moved in parallel in the direction of arrow 11. By doing so, it is possible to know the distance change between the roll 2 and the nozzle body 6, that is, the roughness and shape change of the roll 2 using the differential transformer 5.

The same result can be obtained even if the roll 2 is rotated and the water micrometer 1 is fixed.

Therefore, the present inventors fixed the beam 13 to the chock 12.12' of the roll 2 using a fixing device 14.14' so that its axis was parallel to the axis of the roll 2, as shown in FIG. Water micrometer 1 a z on beam 13
1 b z 1 c were installed at set intervals and a test was conducted to detect the displacement of the roll 2.

Figure 3 shows part of the actual measurement chart obtained at that time using a pen recorder, where curve 15 is obtained from water micrometer 1c (drive side) and curve 16 is obtained from water micromake 1b (roll center). The electrical signals generated are recorded using a pen via an amplifier (not shown).

The horizontal axis shows the elapsed time (minutes) accompanying rolling, and the vertical axis shows the amount of displacement of the roll (μ: 1/1oomm).

Curved sections 15a and 15b that change rapidly. It can be seen that 16a and 16b indicate the case where the material to be rolled (in this case, a thin steel plate) is being rolled, and the gentle curved sections 15c and 16c indicate the case of idling rotation, but as is clear from FIG. In the fixed beam system as shown in Figure 2, it is impossible to determine the roll displacement from the detected values because there are too many disturbances.

This is presumed to be the result of the complex effects of relative distortion of the chocks 12 and 12', detection errors due to mechanical vibrations, and twisting of the beam 13, and it is impossible to detect roll displacement with this method. It turned out that.

Therefore, the present inventors developed the apparatus of the present invention as shown in FIG.

As shown in the figure, this device includes support bearings 1γa and 11b in a chock 12.

17c and 17d are fixed rotatably, and the beam 13 is movably supported by the support bearings 17a to 1γd so that the axis of the beam 13 is parallel to the roll axis.Then, the spring support fitting 18 is similarly fixed to the chock 12. 12' and fixed thereon, and a spring retaining bold 19 is screwed onto the roll so that its axis faces the central axis of the roll 2. Furthermore, the spring retaining bold 19 is threaded from the tip to approximately half of its total length. , an adjustment nut 20 is screwed on, and a suppression spring 21 is inserted from the tip, so that by turning the adjustment nut 20, the beam 13 can be pressed in the roll direction with an arbitrary pressing force.

Therefore, when some impact force is applied from the roll 2 to the beam 13, the suppression spring 21 exhibits a buffering function, so that the beam 13 and the spring holding bolt 19 are
, the spring support fitting 18 is held safely from the impact force.

Moreover, in the experience of the present inventors, by adjusting the adjusting nut 20 and appropriately adjusting the pressing force of the pressing spring 21, the mechanical and thermal conditions of the beam 13 and the support bearings 172 to 1γd spring holding fittings 18 can be adjusted. It was found that the influence on the water micrometer 1 caused by distortion and vibration can be greatly reduced, and it was confirmed that no errors that would cause problems in actual measurements were caused.

Now, in order to regulate the approach distance of the beam 13 to the roll 2, in this embodiment, a stopper fitting 22 is fixed to the chock 12, 12', and the beam 13 is moved forward so that it does not approach the roll more than a set range due to the pressing force. to prevent it.

The water micrometer 1 is fixed to the beam 13 with a mounting nut 23. In this case, if a screw is carved on the outer periphery of the water micrometer 1 so that the distance between the nozzle 4 and the roll 2 can be changed, actual measurements can be made. The distance can be changed depending on the situation, and it is convenient to replace in case of breakdown or maintenance.

In FIG. 4, 24 indicates a conductive wire, and 25 indicates a water supply pipe.

In FIG. 4, only one side has been explained for convenience of explanation, but the other side has a similar mechanism.

Although FIG. 4 describes an example in which one water micrometer is used, the present invention will be described in further detail based on an example in which a steel plate hot rolling roll was actually measured using five such water micrometers.

FIG. 5 is a schematic explanatory diagram of the same, in which a water micrometer lf (hereinafter simply referred to as a meter) is attached to the beam 13 facing the roll center of the roll 2, and the water micrometer lf (hereinafter simply referred to as a meter) is attached to the beam 13, and the water micrometer lf (hereinafter simply referred to as a meter) is attached to the beam 13 at a position 11 left and right (600 mm in this case) with the meter 1f as the center. meter 1
Meters 1e and 1g are arranged at positions where d and 1 h1 are the same < 12 (400 mm in this case), and each is connected to the recorder 21 via a signal amplifier 26 using a conductive wire 24, that is, a signal cable, On the other hand, constant pressure water (3.5 kg/ff1) is supplied from a water source (not shown) to each of the meters 1d to 1h from a water supply pipe 25 via a pressure reducing valve stand 28.

FIG. 6 is a part of the actual measurement chart obtained at that time, in which the curve 29 is obtained from the meter 1h (drive side) and the curve 30 is obtained from the meter If (roll center).

In the figure, the vertical axis shows the elapse of time (minutes) due to rolling, and the horizontal axis shows the displacement μ).

Curved points 31a to 31d and 33a to 33d indicate the time of biting of the material to be rolled, and curved points 32a to 32d and 34a to 34d indicate the point of bottom removal.

Note that curves 29 and 30 were recorded with their positions shifted by an amount equivalent to 15 seconds due to the convenience of the recorder.

As is clear from the figure, the roll deforms significantly each time the material to be rolled is bitten, and the amount of deformation is greater at the roll center than at the drive side.

After the bottom removal, the distance change (displacement) between the meter and the roll surface is measured each time the rolling is done by reading the values at regular intervals.
By comparing the readings of each meter after biting, you can see how the roll profile changes during rolling and how the product profile is affected by this. quantitative clues are given.

In this way, according to the present invention, not only the roll and displacement but also the amount of wear can be accurately determined online.

An example in which roll displacement and roll wear could be accurately measured online has never been seen before, and continuous changes will be further explained with respect to the above example.

FIG. 7 shows the roll displacement calculated for the roll center, and the curve 35 shows the predicted displacement due to temperature rise for each number of rolls, which is the temperature T of the rolled material.

, plate thickness V. , plate width W. , the roll size, the amount of cooling water, its temperature and cooling, etc. were determined as parameters.

Next, the straight line 36 is a prediction of the amount of displacement caused by wear caused by rolling, and is determined based on the idea that it follows a linear equation based on experience.

Therefore, it can be expected that the displacement of the roll center will be as shown by curve 37.

By the way, in the embodiment shown in FIG. 5, the amount of roll displacement obtained from the meter f (displacement movement of the roll center when roll grinding is completed, that is, the initial crown is zero) is calculated from the amount of displacement obtained from C1 meter d (also the initial crown). W1 Displacement obtained from meter h (drive side displacement with initial crown set to zero) Dl Displacement obtained from meter e [400m71L from center to workpiece side] point(
The amount of displacement at the point where severe wear is expected to occur
2O3, W+D obtained by sampling from the actual measurement chart From the above displacement amount, C- is the broken line 38, W400W+D
is shown in FIG. 8 as a broken line 39.

W+D2 The reason for this is to minimize errors.

In the figure, the horizontal axis is the number of rolled pieces, the vertical axis is the displacement (μ: microns), and the numbers 935 to 730 (unit: mm) at the bottom indicate the width of the rolled material, and the rolling schedule is generally like this. is set to

As is clear from the figure, although there are differences in time and quantity between the roll displacement and the calculated prediction, the curve pattern matches, and it has been found through numerous experiments that this pattern does not change.

As mentioned above, the device of the present invention is highly useful as an element of rolling control because it can accurately grasp the transition of roll displacement, and is also important for determining the appropriateness of roll material and dimensions. There are also significant secondary effects, such as the ability to provide information.

Note that if the roll displacement detection device according to the present invention is installed symmetrically about the roll axis, the roll diameter and its changes can be detected at any time.

Next, Table 1 shows the results of tests conducted to prove the reliability of the actual measurement results of the present invention. As a result of comparing the amount of displacement after complete cooling with the amount of displacement after complete cooling and performing temperature correction calculations, it was found that the measurement, that is, the detection result by the device of the present invention, is extremely accurate.

As explained in detail above, the present invention allows roll displacement to be accurately grasped, which not only makes it possible to accurately calculate the roll profile, but also to quickly detect abnormal roll wear, thereby increasing the efficiency of rolling control. This significantly increases reliability and greatly contributes to improving product quality.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram of a water micrometer, Figure 2
The figure is an explanatory diagram of a fixed roll displacement detection device. Figure 6 is a partial diagram of the actual measurement chart obtained in the embodiment of Figure 5, Figure 7 is a graph of predicted roll center displacement, and Figure 8 is a diagram for explaining the method of detecting roll displacement according to the invention. It is a graph showing the transition of the obtained roll displacement according to the rolling progress. 1...Water micrometer, 2...
...Roll, 3... Constant pressure water supply pipe, 4...
... Nozzle, 5... Differential transformer, 6...
... Nozzle body, γ ... Differential transformer core,
8...Spring seat, 9...Spring, 10...Arrow, 11...Arrow, 1
2゜12'...Chock, 13...Beam, 14゜14'...Fixing device, 15...
...Curve, 16...Curve, 11a to 1γd・
...Support bearing, 18 ... Spring support fitting, 19 ... Spring holding bolt, 20 ... Adjustment nut, 21 ... Pressure spring, 22...Stopper metal fittings, 23.
...Mounting nut, 24...Conductor wire, 25
... Water supply pipe, 26 ... Signal amplifier, 2
7...Recorder, 28...Reducing valve stand, 29...Curve, 30...Curve,
31... Curve point, 32... Curve point, 33.
... Curve point, 34... Curve point, 35...
... Curved point, 36 ... Straight line (expected wear displacement), 3
7...Curve (roll center displacement), 38...
...Folded line, 39...Folded line.

Claims (1)

[Claims] A beam on which 11 or more water micrometers are attached; A device for movably supporting the beam via a support bearing rotatably attached to a roll chock; A spring support fitting extended to the roll chock; and a device for pressing the beam in the roll direction, which is made of a spring support bolt fixed to the fitting and having a spring for pushing out the beam at its tip; a beam movement limiting device consisting of a stopper fitting that limits approach to the direction; and a roll displacement detecting device consisting of a device for displaying and/or recording a signal from the water micrometer.