JPH0687013B2 - Roll profile measurement method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a roll profile measuring method for measuring the surface shape (hereinafter referred to as “profile”) of a roll such as a rolling roll.

(Prior Art) A rolling roll for rolling a hot material such as a steel plate has its surface worn away over time depending on its usage time, and has a shape unsuitable for actual work. Specifically, the worn portion of the rolling roll depends on the width of the rolling material, and the amount of wear depends on the material and temperature of the rolling material. Further, when rolling the hot material, the surface profile of the rolling roll is deformed due to the thermal expansion of the rolling roll due to the heat of the material.

On the other hand, in recent years, demands of customers regarding finish accuracy such as shape and width-direction thickness distribution of plate products manufactured by rolling have become very strict, and in order to meet these demands, the surface profile of the rolling roll is strictly controlled. Management is necessary. In order to strictly control the surface profile of the rolling roll, it is desirable to measure the profile of the rolling roll with high accuracy during the actual rolling operation. If the bending force of the bender, the shift amount of the work roll, etc. are continuously changed and controlled according to this result, it is only possible to manufacture a plate material having an even higher precision and an excellent shape. Alternatively, the surface profile can be corrected by grinding the rolling roll with a dalinder or high-pressure jet water without interrupting the rolling operation.

By the way, as a conventional method or apparatus for measuring the profile of a rolling roll, there are inventions disclosed in JP-A-61-138108 and JP-A-63-195512.

First, in the former invention, the distance to the rolling roll surface is measured by a large number of water column ultrasonic distance sensors arranged over the entire length in the axial direction of the rolling roll, and the profile is to be measured from the measurement result. is there.

On the other hand, the latter invention is capable of moving in a direction along the axial length direction of the surface of the rolling roll, and disposing four or more distance sensors at equal intervals in the moving direction, and measuring each time the distance is moved by the distance. Distance is obtained, and the simultaneous linear equations are obtained from the results to solve it, so that the surface profile of the rolling roll is obtained, a water column ultrasonic sensor is used as a distance sensor, and the axis of the rolling roll to be measured is also used. Two distance sensors that rotate integrally with the water column ultrasonic distance sensor around the axis parallel to and perform distance measurement in the direction parallel to the distance measurement direction are arranged. The acoustic wave distance sensor is provided with means for detecting the angle between the water column and the surface of the rolling roll, in other words, the orientation of the water column ultrasonic wave distance sensor, and controlling so as to always maintain the orthogonal state.

(Problems to be Solved by the Invention) However, in the conventional configuration as described above, in the former example, the pedestal to which a large number of water column ultrasonic distance sensors are attached is distorted by the heat of the rolled material and the individual water column ultrasonic distance sensors are deformed. There is a great possibility that the distance measurement direction of will be out of order, and this will cause a measurement error, making high-precision measurement difficult. Also, in the latter example, although there is an improvement in the point of measuring while maintaining the orthogonal state, the configuration becomes complicated correspondingly, distance measurement does not change to the distance between the roll surface distance sensor,
If the measurement is performed during the rolling operation, it is difficult to accurately measure the distance due to the effects of rolling roll rotation, mechanical vibration, heat of the rolled material, etc., and it is very difficult to reproduce a faithful profile. there were.

In view of such conventional problems, the present invention is a roll capable of faithful reproduction of a roll profile without being affected by heat distortion or mechanical vibration of a rolled material even during rolling operation. The purpose is to provide a profile measuring method.

(Means for Solving the Problem) In order to solve the above problems, the roll profile measuring method of the present invention has an ultrasonic echo reflecting portion made of a different substance inside the dimensional position from the surface in the cylinder length direction of the roll. Provided,
The initial distance from the roll surface of the echo reflecting portion is measured in advance, and the dimension is stored as a reference dimension, and the distance between the roll surface and the echo reflecting portion is measured online by a distance sensor using a water column ultrasonic wave. The measurement is performed continuously, and the change in the roll profile is calculated from the change in the difference between the reference size and the measured size.

(Operation) According to the present invention, the distance between the roll surface and the echo reflection portion provided inside the roll is measured by the method described above without being affected by the change in the distance between the roll surface and the distance sensor. The change in the profile due to the abrasion of the roll surface is measured from the change in the difference in the measurement distance.

(Examples) Hereinafter, a roll profile measuring method according to the present invention will be described in detail with reference to the drawings.

First, FIG. 1 is a block diagram of a roll profile measuring method in the first embodiment of the present invention, and FIG. 2 is a sectional view of the roll in FIG. In the figure, reference numeral 1 is a roll such as a rolling roll, and this roll 1 is provided with an ultrasonic echo reflection portion 2 made of a different substance inside the dimensional position from the surface in the cylinder length direction. The echo reflector 2 is provided by providing holes or voids and charging a substance having a different acoustic impedance than the material of the roll 1 (usually iron), for example, air, water, oil, a metal other than iron, or the like. It will be done. The dimension h of the echo reflecting portion 2 from the roll surface can be set in advance by being initially configured as the reference position. As shown in FIG. 1, even in the case of a roll having a bulged central portion compared to both ends, the dimension h can be set differently depending on the trunk length direction.

Reference numeral 3 denotes a water column ultrasonic distance sensor, which is scanned in the axial direction of the roll 1, and emits an ultrasonic echo 3b while ejecting the water column 3a onto the surface of the roll 1
The reflected echo e ₁ and the second echo reflecting portion e _{2 in} the echo reflecting portion ₂ are detected, and both reflected echoes e ₁ and e ₂ are input to the distance measuring means 4. In the distance measuring means 4, both reflection echoes e ₁ ,
The distance from the surface of the roll 1 to the echo reflector 2 is output from the difference in the distance based on e ₂ .

As described above, the dimension of the echo reflecting portion 2 from the surface of the roll 1 can be preset, but here, at the beginning of use of the roll 1, the distance sensor 3 scans the roll 1 in the axial direction once. The dimensional position of the echo reflecting portion 2 from the surface of the roll 1 at each position is measured by the above, and this is used as a reference dimension to be output from the distance measuring means 4 to the reference dimension storage means 5 and stored in advance. This distance sensor 3
Even in the case of not depending on the above, it goes without saying that the reference dimension of the reference position is set in advance in the reference dimension storage means.

Reference numeral 6 denotes a comparison calculation means, which measures the distance between the surface of the roll 1 and the echo reflection portion 2 while continuously repeating the scanning of the distance sensor 3 online and inputs the measurement result from the distance measurement means 4. Then, it is compared with the reference size stored in the reference size storage means 5. Then, the profile result of the roll 1 can be measured by inputting the comparison result to the next profile output means 7 and calculating the profile output means 7. Here, when abrasion occurs on the surface of the roll 1, a difference occurs between the measurement dimension and the reference dimension, and the roll profile is measured as changed.

The echo reflecting portion 2 in the above-described first embodiment is formed in the long hole portion of the roll 1 in the cylinder length direction. The echo reflecting portion 2 is shown in FIGS. 3 and 4 (a). It may be configured as shown in (b). That is, the roll 1a shown in FIG.
In the roll 1b shown in FIG. 4, the echo reflection portion 2a is made of an oil layer, and in the roll 1b shown in FIG.

(Effect of the Invention) As described above, according to the present invention, an ultrasonic echo reflection section made of a different substance is provided inside the roll, and the distance between the echo reflection section and the roll surface is set as a reference dimension and the distance is calculated online. The sensor continuously measures the distance between the roll surface and the echo reflection part, and the change in the roll profile is calculated from the change in the difference between the measured dimension and the reference dimension. The roll profile can be faithfully reproduced without being affected by mechanical vibration, which is a very effective invention.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a sectional view of the roll, and FIGS. 3 and 4 are side views ((a)) and sectional views of a roll of another embodiment. ((B) figure). 1, 1a and 1b are rolls, 2 and 2a and 2b are echo reflectors, 3 is a water column ultrasonic distance sensor, 4 is distance measuring means, 5 is reference dimension storage means, 6 is comparison calculation means, and 7 is profile output means. .

Claims (1)

[Claims] 1. An ultrasonic echo reflection section made of a different substance is provided inside a roll in the lengthwise direction of the roll at an appropriate dimensional position, and the initial distance of the echo reflection section from the roll surface is measured in advance. The size is stored as a standard size, and the distance between the roll surface and the echo reflection part is continuously measured by a distance sensor using water column ultrasonic wave online, and the roll is determined from the change in the difference between the standard size and the measured size. A method for measuring roll profile, characterized in that the change in the profile of the roll is calculated.