JPH01295108A - Method and device for measuring profile of roll - Google Patents

Abstract

PURPOSE:To measure the profile of the roll with high accuracy by defining the roll profile as variation in the radius of the outer peripheral surface of the roll in its axial direction, and calculating the radius of the outer peripheral surface of the roll as the function system of the mutual differences in the distance between the outer peripheral surface of the roll and a distance sensor head. CONSTITUTION:A driving device 17 rotates a screw shaft 15 to move a moving element 16, i.e. sensor box 12, thereby measuring the distance (Lij) (i=1, 2, 3) between the outer peripheral surface of the roll 1 and the distance sensor 11. The radius of the outer peripheral surface of the roll 1 is the function system of the mutual differences among respective distance measured values L11, L12, and L13, so it is measured with accuracy. Then the driving device 17 moves the sensor box 12 by one pitch according to a scanning pitch and the outer peripheral surface radius of the roll 1 is operated similarly. This operation is repeated to display the roll profile on a display device 20 according to the outer peripheral surface radius.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a roll profile measuring method and apparatus used in the rolling process of metal materials.

<Conventional technology> Conventionally, in the rolling process of steel, etc., a method for measuring the roll shape, or profile, online has been to place a stand along the roll surface parallel to the roll axis direction, and to measure the roll profile on-line. A known method is to attach one or more rangefinders to a vehicle and measure the distance between the sensor head of the rangefinder and the roll surface to determine the roll profile. 1986-138
No. 108 and the like are disclosed.

The basic configuration of JP-A-61-138108 is, as shown in FIG. The distance Pi to the surface of the roll 1 and the distance Si to the reference wire 4 are detected and sequentially captured by the scanner 5, and the distance change distribution Zi=Pr+Sj+anatomy (here, i=1.2・. . , Wi: distance # of the reference wire 4 from the X axis) are calculated and the roll profile is displayed on the display device 7 as a curve connecting these points.

<Problems to be Solved by the Invention> However, in such conventional examples, the absolute value of the measured distance itself is immediately fixed as the roll profile, so it is impossible to avoid errors due to distance disturbances as described below. The problem is that there is no.

■ Error due to deviation from parallelism between the line segment or scanning line at constant interval position 3 in the direction of the roll axis between the roll axis and the ultrasonic distance meter 2.2.

■ Errors due to profile deformation caused by roll bending, which is intentionally performed to control the shape of rolled materials.

Here, it is possible in principle to reduce the error in the 0 term to a level that is virtually impossible by improving mechanical accuracy, but the error in the Processing is required and is not preferred in any case.

An object of the present invention is to provide a roll profile measuring method and apparatus suitable for solving the above problems.

<Means for Solving the Problems> As a result of intensive experimental research by the present inventors in order to solve the above problems, we found that: ■ The roll profile is a continuous change in the radius of the roll outer circumferential surface in the direction of the roll axis, i.e. We found two mathematical theoretical principles: 1. The radius of the roll's outer circumferential surface can be determined without depending on the absolute value of the distance between the roll's outer periphery and the distance meter. Based on this knowledge, we have completed the present invention.

That is, the first aspect of the present invention is to measure the roll profile in a non-contact manner by measuring the distance from a predetermined position in the roll axis direction to the roll outer circumferential surface at predetermined intervals and determining the roll outer circumferential surface radius. is calculated, and the relationship between the value of the roll outer circumferential surface radius and the position in the roll axis direction is expressed as 2
This is a roll profile measurement method characterized by obtaining a roll profile by dimensionally positioning and connecting them with curves.

Further, a second aspect of the present invention includes: a distance measuring device that measures the distance to the outer circumferential surface of the roll; a scanning device that moves the distance measuring device in the direction of the roll axis; and a measuring signal of the distance measuring device. A roll profile measuring device comprising: a calculation device that calculates the radius of the outer circumferential surface of the roll; and a display device that displays the calculation result.

The configuration of the present invention will be specifically explained below with reference to FIG.

In the figure, 11 is a distance sensor such as an ultrasonic distance meter housed in a sensor box 12, and a roll 1
For example, they are arranged in three positions at predetermined intervals in the circumferential direction of the outer peripheral surface of the.

Reference numeral 13 denotes a scanning device, which includes a screw shaft 15 which is provided substantially parallel to the axial direction of the roll l, and whose both ends are supported by bearings 14a and 14b, and which is screwed onto the screw shaft 15 and has an upper portion thereof. and a mover 16 on which the sensor box 12 is placed and fixed.

Reference numeral 17 denotes a drive device, in which the screw shaft 15 is freely rotatable via gears lea and 18b.

Reference numeral 19 denotes a calculation device that calculates the roll outer peripheral surface radius using the detection signal of the distance sensor II, and further calculates the regression curve of the roll profile.

Reference numeral 20 denotes a display device, such as a CRT, which displays the regression curve of the roll profile calculated by the calculation device 19.

Roll profile measuring device configured as shown ff1o
For example, the profile of the roll 1 is measured sequentially from one end of the roll 1.

In addition, in the configuration of the roll profile measuring device 10 described above, the sensor box 12 is explained as one, but depending on the allowable measurement time, equipment cost, required accuracy, etc.
A plurality of distance sensors 11 may be provided. In addition to the ultrasonic distance meter, the distance sensor 11 may be any type of non-contact distance meter such as a laser distance meter.

<For production> The present invention will be explained in detail based on FIG.

■ Set the roll profile measuring device IO almost parallel to the axial direction of the roll 1.

(2) Set the measurement start point S, the measurement end point E, and the scanning pitch P in the calculation device 19, respectively.

(2) The distance sensor 11 is set at the measurement starting point S by activating the drive device 17 to rotate the screw shaft 15 and move the mover 16, that is, the sensor box 12.

(2) Measure the distance LIJ (j=1.2.3) between the outer circumferential surface of the roll 1 at the measurement starting point S and the distance sensor 11, and input it to the arithmetic unit W19.

(2) The calculation device 19 immediately calculates the outer peripheral surface radius R+ of the roll 1 based on this measurement signal Llj and stores it together with the measurement position a1 at that time.

Here, a method of calculating the outer circumferential surface radius R of the roll 1 will be explained in detail.

Now, assuming that there are three distance sensors 11, the number of distance sensors 11 is 8, , and 2 as shown in FIG. Provided at three locations (83). Therefore,
8. Karahe 2. Eight, the respective distances to eight, □.

8. As 3, these distances [IA of sensor 11,
, A2゜8, and their respective corresponding rolls.
Let the measured value of the distance between the outer peripheral surface opening +, l'lz, and R3 be □, L12°113.

The outer circumferential surface radius R of the roll 1 at this time is calculated by the following equation (1).

+4,2・Δ3. ) −
〜−−−−−−−, (1) Here, Δ12−Lz
1g2 Δ23=1.1°-Lll Δ31=L12 Lz The above equation (1) is based on each distance measurement value 1=I1. Lzz, 1
The phase of g3 is completely independent, and, for example, there is no measurement error in the radius R of the outer circumferential surface of the roll 1 due to deviation from parallelism between the roll axis and the distance sensor scanning line, and the error in the distance sensor 11 itself is also automatically corrected. Therefore, it is possible to measure the roll outer peripheral surface radius with extremely high accuracy.

■ Next, operate the drive device 17 to move the sensor box 12 by one pitch according to the scanning pitch P,
Similarly, the distance L2j between the outer peripheral surface of the roll 19 and the distance sensor 11 is measured, and the radius R2 of the outer peripheral surface of the roll 1 is calculated and stored together with the measured position a2 at that time.

■ From then on, move 1 pitch → distance L + j (+-3,
4, 5..., j=1.2.3) Measurement→Repeat calculation and storage of outer circumferential surface radius R8 of roll 1 until measurement end point E.

(2) After completing all measurements of the roll 1, call up the roll outer peripheral surface radius R8 for each measurement point R8 stored in the arithmetic unit 19, and plot (a, 1, Ri) on the χ-Y coordinate.

(2) After plotting all the data, a regression curve is calculated by, for example, the least squares method, and this regression curve is displayed on the display device 20 as a roll profile.

Note that among the above series of operations, the following selections are possible.

(a) The measurement start and end points S and E may be any position as long as it is in the longitudinal direction of the axis of the roll 1.

The scanning pitch P of the sensor 11 may be arbitrarily determined depending on the purpose, such as the required accuracy of the roll profile, for example.

(C) The method of determining the regression curve of plot points is not limited to the least squares method, and any method may be used, such as simply connecting plot points continuously.

<Example> Examples of the present invention will be described below.

Roll diameter = 700rMIlφ, roll axis length: 20
For a drum-shaped roll of 00 mm2, ultrasonic frequency: 1
Using three 0MHz water column type ultrasonic range finders, the results measured at a scanning pitch of 200mm are calculated using equation (1) above, and the deviation from the measured value at the measurement starting point (11m) is
) is indicated by a circle in Figure 4.

Here, the distance between the first ultrasonic range finder and the second ultrasonic range finder is 180 mm (corresponding to 8 and □ in Figure 3 above), and the distance between the first ultrasonic range finder and the third ultrasonic range finder is The distance from the sonic distance needle was 300 mm (corresponding to Al1).

In addition, in the figure, the △ marks are measurements taken using a reference electric micrometer, and the * marks are those measured using a standard electric micrometer.
8, and all are shown as deviations (pm) from the measured value at the measurement starting point (3).

As is clear from FIG. 4, there is almost no difference between the values measured by the electric micrometer in the example of the present invention, and it can be seen that the roll profile is measured with higher precision.

<Effects of the Invention> As explained above, according to the first aspect of the present invention, the roll profile is defined as the change in the roll outer circumferential surface radius in the axial direction, and the roll outer circumferential radius is calculated based on the roll outer circumferential surface. By using a function system of the mutual difference between the distance between the distance sensor head and the distance between the sensor heads, we have made it independent of measurement errors caused by deviations from parallelism between the roll axis and the sensor head scanning line and inherent errors of the distance sensor. This makes it possible to measure roll profiles with extremely high precision, contributing to improved product quality.

Moreover, the second aspect of the present invention is a suitable apparatus for carrying out the method having the above-mentioned effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing an embodiment according to the present invention;
Fig. 2 is a flowchart showing the operation of the present invention, Fig. 3 is an explanatory diagram of the principle of measuring the radius of the outer peripheral surface of a roll, Fig. 4 is a diagram showing a comparison of measurement examples of roll profiles, and Fig. 5 1 is a measurement system diagram showing a conventional example of a roll profile device. 1...Roll. 10... Roll profile measuring device. 11... Distance sensor (distance measuring device). 12...Sensor box, 13...Scanning device. 14...Bearing, 15...Screw shaft. 16... Mover, 17... Drive device. 18...Gear, 19...Arithmetic device. 20...Display device. Patent applicant: Kawasaki Steel Co., Ltd. Kasumi Wari

Claims (1)

[Claims] 1. When measuring the roll profile in a non-contact manner, the radius of the roll outer circumferential surface is calculated by measuring the distance from a predetermined position in the roll axis direction to the roll outer circumferential surface at predetermined intervals. A roll profile measuring method characterized in that the roll profile is obtained by two-dimensionally locating the relationship between the value of the roll outer circumferential surface radius and the position in the roll axis direction and connecting them with a curve. 2. A distance measuring device that measures the distance to the roll outer circumferential surface, a scanning device that moves this distance measuring device in the roll axis direction, and a calculation that calculates the roll outer circumferential surface radius using the measurement signal of the distance measuring device. A roll profile measuring device comprising: a device; a display device that displays the calculation results; and a roll profile measuring device.