JPS58210503A - Method and device for measuring profile of roll - Google Patents

Abstract

PURPOSE:To measure the profile of a roll with good accuracy by flowing AC to a coil moving in parallel with the roll, measuring thr real part and imaginary part of impedance, and converting the same to the distance between the coil and the roll by using a conversion operation. CONSTITUTION:A sensor coil 20a is moved in parallel with the axis of a roll by a sensor moving device 62. AC is flowed to the coil 20a moved by said device and the real part and imaginary part of the impedance are determined successively with an impedance measuring device 66. Upon completion of the scanning, the impedance is converted to the distance between the coil 20a and the surface of the roll by using the conversion operation determined unequivocally by the shape of the coil 20a. The distribution in the change of the distance in the axial direction of the roll is calculated with an arithmetic control device 68 from said measured distance value and the output of a detector 64 for sensor position and the profile of the roll is displayed with a display 70. The profile of the roll is thus measured online with good accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for measuring the profile of a roll, and particularly to a method and apparatus for measuring the profile of a roll used when manufacturing a plate or the like by rolling a material such as metal. Distance between the reference surface and the roll surface suitable for use in detecting *#t - Distance change in the roll axis direction between the reference surface parallel to the roll axis and the roll surface using a detectable distance measuring device measure the distribution,
The present invention relates to improvements in a method and device for measuring a roll profile so that the roll profile can be determined from now on.

In the rolling process of the steel industry, roll profile management has become extremely important because it is closely related to the longitudinal cross-sectional shape (profile) Fi of the roll and the shape and dimensions of the rolled product. Generally, in order to perform proper rolling, the roll tube is ground to the most suitable profile prior to rolling, but the roll profile may change due to wear or thermal expansion due to temperature rise. It changes significantly during rolling, and it is not easy to obtain rolled products with excellent shapes.

However, detecting the roll profile during rolling,
By performing appropriate control, such as changing the roll bending, it becomes possible to obtain rolled products with a shape and profile that are much better than those of the past. Also, if you can detect the roll blow wheel online, you can also judge the wear status.

Role management can be performed accurately, such as optimally deciding when to rearrange roles. Furthermore, in combination with on-line roll grinding, rolling can be done at any time and in any size. It also becomes possible to realize roll chance-free rolling.

For the reasons mentioned above, it is highly desirable to detect the roll profile online, but in general, there are many factors that impede measurement in rolling facilities, such as dust, water droplets, steam, and high temperatures, so it is difficult to detect roll profiles online. The sensor (on-line, reliable roll profile measurement)
This used to be difficult.

On the other hand, as shown in Japanese Unexamined Patent Publication No. 52-94154, a water micrometer is used as a distance detector, for example, to measure the distance change distribution in the roll axis direction between a reference plane parallel to the roll axis and the roll surface. If you use
Easily affected by roll cooling water (there was a problem with accuracy).

Additionally, an eddy current distance meter is known that calculates the distance between the sensor coil and the object to be measured from the change in impedance that occurs in the sensor coil when the sensor coil is brought close to the object to be measured. It is also conceivable to use this eddy current distance needle for measuring the roll profile. However, the eddy current distance meter is a non-contact measurement,
Although it has the advantage of being completely unaffected by dust and water vapor in rolling facilities,
It has the disadvantage of being strongly influenced by changes in material, etc. Therefore, it was conventionally considered difficult to use the eddy current distance meter for measuring roll profiles.

The present invention was made in order to eliminate the above-mentioned conventional drawbacks, and provides a method and apparatus for measuring a roll profile that can measure a roll profile online with high reliability (and high accuracy). The purpose is to

The present invention measures the distance change distribution in the roll axis direction between the reference plane parallel to the roll axis and the roll surface using a detector that can detect the distance between the reference plane and the roll surface, and then measures the distance change distribution in the roll axis direction between the reference plane and the roll surface parallel to the roll axis. In the roll 10 field measurement method, the distance detector measures the real part and imaginary part of the impedance of the sensor coil through which an alternating current is passed, and determines this uniquely by the shape of the sensor coil. By converting the distance between the sensor coil and the roll surface using a conversion operation tube, it is possible to obtain a distance measurement value that is not affected by changes in the electrical properties of the roll.
Try using an eddy current distance meter.

The above objectives have been achieved.

Further, the sensor coil is fixed to a reference plane parallel to the roll axis and scans the rail on the roll axis, so that the roll profile can be measured with a small number of sensor coils. .

Alternatively, a plurality of sensor coils are fixed in parallel on a reference plane parallel to the roll axis, so that the roll profile can be quickly measured without scanning the sensor coils.

The present invention also provides a roll profile measuring device including a sensor coil that is scanned in the roll axis direction on a rail fixed to a reference plane parallel to the roll axis.

A sensor coil movement am for moving the sensor coil in the roll axis direction, a sensor coil position detector for detecting the position of the sensor coil in the roll axis direction, and an AC current flowing through the sensor coil to measure its impedance. an impedance measuring device for measuring the impedance part and the imaginary part, and while moving the sensor coil in the roll axis direction, the real part and the imaginary part of the impedance are determined in correspondence with the position in the roll axis direction, t/lit; After scanning, the distance between the sensor coil and the roll surface is converted using a conversion operation uniquely determined by the shape of the sensor coil to obtain a distance measurement value that is not affected by changes in the electrical properties of the roll.

An arithmetic and control device that obtains a distance change distribution in the roll axis direction from the correspondence between the measured distance value and a position in the roll axis direction; and a profile display device that displays a roll profile in accordance with the output of the arithmetic and control device.

It was constructed using

Hereinafter, the principle of the present invention will be explained in detail with reference to the drawings.

The sensor 20 of the eddy current distance meter used in the present invention is
For example, as shown in Fig. 1, a pair of left and right roll chocks 1
A rail 24 fixed to a reference surface 22a of a reference plate 22 parallel to the roll axis of a rolling roll lO rotatably supported by a rolling roll 2 is scanned along the roll surface in the roll axis direction. There is. That is, the reference plate 22 for forming the reference plane 22a is fixed substantially parallel to the axis of the loaf t by bolts 28 via a buffer rubber 26 or a spring for buffering external impact force. The rail 24 is fixed to the upper surface (reference surface 228) of this reference plate 22,
The sensor 2o is configured to slide on the rail 24 by a motor 3o and a ball screw 32 or a wire directly connected to the motor 3o. Note that the sensor 2o has a built-in sensor coil 20a and a roll 1.
The sensor 2o, the sensor 20', and the sensor moving device N for moving in the direction of the roll axis are all placed in a storage case 34. The inside of the storage case 34 is air purged with air supplied from the air supply device 36. Therefore, the sensor 20 and the sensor moving device are protected from heat, water vapor, dust, etc. is stably moved along the roll surface, approximately parallel to the roll axis direction.

Inside the sensor 20, as shown in detail in FIG.
A built-in sensor coil 2()a is wound in a cylindrical shape with 5 turns so that the number of turns is 10 to 1.00 (approximately 1 turn).

Distance measurement using the above-mentioned 5 sensor coils 20ai is as follows:
This is done as follows.

That is, first, as shown in Fig. 3, the unknown impedance z
X sensor coils 20a and respective known impedances 21.2. , z3 comparison element 40°42.44
An alternating current voltage (■) of a constant frequency is applied from the current transformer oscillator 46 to the alternating current bridge 38 which is generated by TLF. When fully supplied, an unbalanced output C is generated at the AC bridge 38. Therefore, the unbalanced output Φ is amplified by the tuned amplifier 4, and detected by the synchronous phase detector 50 into an in-phase component and a quadrature component of the AC voltage applied to the AC bridge 38, and 7. The measured Narita EX and Ey can be obtained by amplifying with a DC amplifier 52 including an in-phase component DC amplifier and a quadrature component DC amplifier.

Here, with the impedance Zx of the sensor coil 20a unchanged, the unbalanced output IEb of the AC bridge 38
's, will be 0 to 5, comparison element 40.42.44
If the known impedance of
The foot count IIK Eo is determined from the change ΔE in the measured voltage when the voltage is changed by s using the following formula.

・IKE(1-1sll ・Z t-' ((7L y
+! a) −' (Z 2+Z 5-1-△works
)' Todo (1) Next, by switching the relay switch 54, the impedance of the comparison element 44'(l' 7L B + Be1
Return to z3 from z3, set the sensor coil 20a to the measuring state, and measure the bridge output voltage E moment by moment while moving it along the sensor coil 2υa & roll lO, and calculate the impedance zxi of the sensor coil 2 (Ja) by the following formula
calculate.

Zx"X, IC(E(:1KEr+)-'+z, (Zy
+2Zs) ト'-1)-' -・-・-・(2) I! The sweeping described in iJ can be easily performed without manual intervention by, for example, the analog-to-digital converter 56, the calculation control device 58, and the relay switch 54.

According to such an impedance-difference constant force method, highly accurate impedance measurement is possible at a sieving speed. For example, if the frequency of the flow oscillator 46 is set to 30K11z, measurements can be made 1000 times per second.

Next, the sensor coil 20a obtained as described above is
The distance between the impedance scalar and the sensor coil 20a and the roll surface is determined as follows.

That is, using the sensor coil 20avil- shown in the above-mentioned FIG. A. Distance ht- between conductors 60 whose magnetic permeability is μ
Considering the case of foot measurement, the complex inductance Lu and Maxwe of the sensor coil 20a in such a situation are
The equation of l 1 can be solved by the following equation.

・・・・・・・・・(3) =F(h,q) ・・Song・(4) a m FW
= ((j,, oao”/q)tO/((j, a,
o”A)”IC)-(5)q;A μr/ω ・Curved surface (
6), and Lo is the inductance of the coil not close to the conductor 6o, μrVi, and the relative permeability of the conductor 6o (=
−1fin #vacuum permeability), ω is the angular frequency of the current flowing through the coil μO.

Now, if the temperature of the roll changes from 20 to 600'C and the ratio changes and the pseudopods change, the product fttr will be 0.95 X l O-'
~10.8 Xl0-'Ωm changes. Therefore, the product μ
r within this range.

Assuming that the distance changes in the range ht-s to 13 m, the inner radius of the sensor coil 20a is set to = 3QB, the outer radius a = 320, and the length/=5.

In Figure 4, the group of vertical curves is the locus when the distance is constant and the product Aμr changes, and the group of horizontal curves is the trajectory when the product Jμr is constant and the distance is changed. This is the trajectory of

Now, as shown in Fig. 5, when the roll temperature is T°C.

Assuming that the roll's electrical resistivity, relative magnetic permeability, and distance between the sensor coil and roll are a, μ, and h, respectively, the first order is
Because the roll temperature changed to 6=T'°C.

Considering the case where the respective values change to A', μ', and h' due to thermal expansion, etc., the inductance of the sensor coil 20a changes from point P to point P on the double horizontal plane, as shown in FIG.
There is a movement at point Q (.Therefore, if you find out which curves point P and point Q are on, you can find the distance, product fμ, distance h/, and product Jμ'.For example, measurement Therefore, the inductance is real part 0.031, imaginary part 0.9
79 (point P), then from Fig. 4, the distance h=lQ,
It can be read as Q, product A μ = 1.35
This corresponds to performing the inverse transformation of F-'.

Next, the row 5 method will be explained using this inverse transformation F-1t, , arithmetic processing.

First, using equation (3) above, set the distance bt - constant.

A group of curves created by diamondizing the product qt (vertical curve a in Figure 4)
) is expressed by the following formula.

Σ f(x, y, h); I, j, kfljkxlylhk(
i, j, = o61...n) = Σ(Σf x'y'
)hk k IJ jjk =0 ・・・・・・・・・・・・・・・(7) This (
7] The coefficient f1jkt in equation (7) is determined so that the group of curves expressed by equation (7) matches the group of vertical curves shown in FIG. 4 above. Once the coefficient f1jk is determined, when X and y are obtained by the primary measurement, the above equation (7) becomes
Since this is an n-dimensional equation regarding distance, the operation of finding the root corresponds to inverse transformation pf.

Therefore, for example, if n<4, the roots can be found elementary.

Below, a method for measuring a roll profile according to the present invention will be explained in detail.

First, the shape of the sensor coil 20a to be used (a, , al
, l), range of distance to be measured, roll a, μr
The above-mentioned equation (3) is calculated in accordance with the range of change of , and the inverse transformation F-1t is obtained by the method described above, and the program is stored in the controller.

Next, by the impedance measurement method described above, the impedance of the sensor coil 20a is measured in a state where the sensor coil 20a is close to the roll IO,
Store it in the arithmetic and control unit.

Furthermore, the Senbu coil 20m is attached to the Senbu coil moving device U as shown in FIG. At the same time, the arithmetic and control unit uses a linear equation to calculate x,'
l' and sequentially stored in the arithmetic and control unit.

(8) At the point when the full length movement of the sensor coil 20a is completed, the arithmetic processing unit performs an inverse transformation F- such as the quintic equation.
11. and adjust the distance between the roll lO and the sensor coil 20a.

h = F-' (x, y) ・・・・・・・・・
(9) Further, the arithmetic fa control device performs correction taking into account the inclination of the reference line and draws a distance distribution corresponding to the axial position of the roll to obtain the roll profile.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a roll profile measuring device according to the present invention will be described in detail below with reference to one drawing.

In this embodiment, as shown in FIG. 6, a sensor coil 2 is scanned in the direction of the roll axis on a rail 24 fixed to a reference surface 22a parallel to the roll axis, as shown in FIG.
0at includes a sensor 20, and the sensor 20 is for moving all rolls axially.

An alternating current is passed through the sensor moving device 62 as shown in FIG. AC oscillator 46 for measuring the real and imaginary parts of . An impedance measuring device 66 consisting of an AC bridge 3B, a tuned amplifier 48, a synchronous phase detector 50, a DC amplifier 52, and an analog-to-digital converter 56, and the sensor 20 are moved in the roll axis direction to correspond to the roll axis direction position. The real part and the imaginary part of the impedance are sequentially obtained, and after the scanning is completed, a conversion operation F- which is uniquely determined by the shape of the sensor coil 20a is performed.
It is converted into the distance between the sensor coil 20a and the roll surface by using It- to obtain a distance measurement value that is not affected by changes in the electrical property values of the roll, and from the correspondence between the distance measurement value and the roll axial position, the roll axis is determined. An arithmetic and control device 68 that calculates the distance change distribution in the direction, and a profile display device 7 that displays a roll profile according to the output of the arithmetic and control device 68.
It is composed of 0.

Measurement of the roll profile according to this embodiment is performed as follows.

That is, first, considering the shape of the sensor coil 20a used, the measurement distance range, and the temperature change range of the roll,
The value of the coefficient f ijk of the above-mentioned equation (7) is determined by calculating the equation. For example, the inner radius B of the sensor coil 20a is 39 m.
11.Outer radius ILI: 32m11. Length 71 = 5
m, measurement distance range 8-130, roll temperature change range O
~600°C, l=0.1. j=0, 1.2
．． If =0.1.2,3, then it becomes as shown in the linear equation.

0.12-3) as the coefficient of hk, that is, the operation of finding the root of the following equation.

(?3 'IJsx'yj)h"+(6fB,x')'
j) h"+"'ijI"""?3' ij
The impedance of the sensor coil 20a is 2 (=x+
jy) and measure it! , )', use the above equation (lO) and the matrix shown in equation (11) to create a cubic equation as shown in equation (12), and calculate its roots. Then, in the manner described above, the impedance measuring device 66 first measures the 10-pin coil 20a in a state where it is not close to the roll 10 (in an empty state).

Measure the impedance Nak of the sensor coil 20a.

In the AC bridge 38, for example, as shown in FIG. It can be used in a Wien bridge consisting of a resistor and a capacitor with a capacitance value of C0. Imaichi R1=
Rt=150.0Ω, Ro=250.0Ω, Co=
0.030000μp, ΔCn=200PF.

EO"l VRMB, frequency 't- of the oscillator 46
Impedance of sensor coil 20a measured as 30KH2. An example of the value of is 85°s7+j1aa,s
It is o.

Next, move the sensor coil 20ae sensor! ! 1ItI while moving it along the roll 10.
The impedance measuring device 66 detects the sensor coil 2.
The impedance z of 0a is measured sequentially in synchronization with the axial position of the roll.

The arithmetic and control unit 68 performs the expression 3t of the above-mentioned equation (8).

The set of (x, y) is sequentially stored in the arithmetic and control unit N88.

When the movement of the sender 20 is completed and the measurement is completed over the entire length of the roll, the arithmetic and control unit 68 calculates the change distribution of distance in the roll axis direction.

Furthermore, since the sensor 20 moves along the reference plane, if there is an inclination between the reference plane and the roll axis, it is necessary to make a correction sound. However, in the case of a rolling roll, both ends of the roll do not undergo wear and maintain their initial shape, so at both ends of the roll,
It is sufficient to perform all reference plane corrections so that the distance between the senna and the roll becomes equal.

The above-mentioned reference plane correction is performed on the change distribution in the roll axis direction of the distance between the roll and the senna determined by the inverse transformation p-1, and the distance distribution is made in correspondence with the position in the roll axis direction. If displayed on the profile display device 70, a role profile can be obtained.

FIG. 8 shows an example of measuring the profile of a roll in a stationary state according to the above embodiment. In Figure 8, solid line A
is the result measured by the method of the present invention, the broken line B is the result measured with a contact distance meter, and the circle mark is the result measured with a hand micrometer. As is clear from FIG. 8, the method of the present invention.

The measurement accuracy is equivalent to that of a conventional contact distance meter.

In addition, Figure 1289 shows the results of measuring the thermal expansion caused by locally heating the roll. In Figure 9,
Broken line C is the roll profile before heating, solid line A
is the measurement result of the roll profile after heating by the method of the present invention, and the solid line D is the measurement result of the roll profile after heating by the conventional eddy current distance meter. It is clear from the figure 1. As shown in c, the conventional eddy current distance meter is affected by the temperature of the roll and cannot measure thermal expansion, whereas the method of the present invention can measure it well.

Furthermore, the results of measuring the roll profile of an actually rotating roll are shown in Figure 1O, and in Figure 101, the solid line A shows the result of measuring the roll profile using the method of the present invention. , the solid line E shows the result after the effects of eccentricity and vibration are removed by performing averaging processing for each rotation of one roll. As is clear from the figure, the measured value of the roll profile is influenced by the eccentricity and lift of the U-roll, and has a sawtooth shape.

By performing averaging processing for each rotation of the roll.

The effects of eccentricity and vibration can be divided by 9, and by this averaging process, it is possible to obtain the same overall roll profile as at rest. Such dynamic measurements are possible for the first time with the method of the present invention. ].

In the above embodiment, a single sensor is used.

The entire roll profile was measured by scanning in the direction of the roll axis on a rail fixed to a work reference plane parallel to the roll axis, but the roll profile? !
- The method of obtaining is not limited to this one, for example, as shown in Figure 11.
As a modification, it is also possible to measure the roll profile by placing a plurality of seven units 20vi in parallel on the reference plane 22a parallel to the roll axis, or by allowing them to move in parallel. In this case, the key is to shorten the measurement time.

As explained above, going to the main station has the excellent effect of being able to measure the roll profile online with high reliability and accuracy.

[Brief explanation of the drawing]

1 is a front view showing the relative positional relationship between the roll and the sensor coil PV in the roll profile measuring method according to the present invention; FIG. 2 is a perspective view showing the principle of eddy current distance measurement; 4 is a block diagram showing the principle of impedance measurement, and FIG. 4 is a block diagram showing the relationship between the impedance of the sensor coil and the electromagnetic characteristic value of the roll to clarify the principle of eddy current distance measurement.
i91i￥1, Figure 5 is a front view showing the relative positional relationship between the roll and sensor coil before and after thermal expansion, for explaining the principle of the roll profile measuring method according to the present invention, and Figure 6 is a front view showing the relative positional relationship between the roll and the sensor coil before and after thermal expansion. FIG. 7 is a circuit diagram showing an example of the AC bridge used in the embodiment, and FIG. 8 is a block diagram showing the overall configuration of the roll profile measuring device according to the embodiment. FIG. 9 is a graph showing a comparison of measurement results using a conventional contact distance meter and a non-contact distance meter. Similarly, FIG. Similarly, FIG. 10 is a diagram showing an example of the roll profile measurement results during roll rotation in the above embodiment, and FIG. 11 is a diagram showing the arrangement of the sensor coil in a modification of the present invention. It is a front view. lO... Roll for rolling, 20... Sensor, 20a.
...Sensor coil, 22...Reference plate, 22a...Reference surface, 38...Tributary bridge, 40.42.44...
- Comparison element, 46... AC oscillator, 48... Tuned amplifier, 50... Synchronous phase detector, 52... DC amplifier. 54... Relay switch, 56... Analog-digital converter, 58... Calculation control device, 62... Sensor moving unit, 64... Sensor position detector, 66...
Impedance measurement device, 68... Arithmetic control device. 70...Profile display device q0 Agent Takaya Ron (and 1 other person) Figure 4 Ichijō Kaiboi 6a) Diku Gunzu/11i "Ji':
Fig. 6 6 Fig. 7 811A Roll's wide if distance flight [-Fig.

Claims (1)

[Claims] (Li) Measuring the distance change distribution in the roll axis direction between the reference plane parallel to the roll axis and the roll surface using a distance detector capable of detecting the distance between the reference plane and the roll surface, In the method for measuring roll 10 feel, which will now be known, the distance detector measures the real part and imaginary part of the impedance of a sensor coil through which an alternating current is passed, and this is uniquely determined by the shape of the sensor coil. The method uses an eddy current distance meter that converts the distance between the sensor coil and the roll surface using a conversion operation determined by (2) The sensor coil scans in the roll axis direction on a rail fixed to a reference plane parallel to the roll axis. The roll profile measuring method according to claim 1. (3) The roll profile according to claim 1, wherein a plurality of the sensor coils are fixed in parallel on a reference plane parallel to the roll axis. (4) A sensor coil that is scanned in the direction of the roll axis on a rail fixed to a reference plane parallel to the roll axis, and a sensor coil moving device that moves the skeleton sensor coil in the direction of the roll axis. , a sensor coil position detector for detecting the position sound of the sensor coil in the roll axis direction; an impedance measuring device for passing an alternating current through the sensor coil and measuring the real part and imaginary part sound of the impedance; While moving in the roll axis direction, the real part and imaginary part of the impedance corresponding to the position in the roll axis direction are sequentially determined, and after scanning is completed, the sensor coil and A calculation that calculates a distance measurement value that is not affected by changes in the electrical property values of the roll by converting it into a distance on the roll surface, and then calculates a distance change distribution in the roll axis direction from the correspondence between the distance measurement value and the roll axis position. A roll profile measuring device comprising: a control device; and a profile display device that displays a roll profile according to the output of the arithmetic and control device.