KR101765597B1 - Profile mesuring apparatus of roll and profile measuring method of roll using the same - Google Patents

Abstract

The present invention relates to a roll profile measuring apparatus and a profile measuring method using the same, which are configured to enable accurate and easy measurement of a profile of a roll by attaching to one side of the roll, comprising: fixing means fixed to a roll; A displacement reference shaft rotatably fixed to the fixing means; A long axis frame integrally fixed to the displacement reference axis and for fixing the displacement sensor in a variable manner; An angle indicating needle for indicating a slope of the long axis frame with respect to the displacement reference axis; An angle display panel on which a scale for displaying the inclination of the long axis frame is displayed according to a position of the angle indicating needles; And a displacement sensor fixed to the long axis frame so as to be variable.

Description

[0001] The present invention relates to a roll profile measuring apparatus and a profile measuring method using the roll profile measuring apparatus.

The present invention relates to a roll profile measuring apparatus and a profile measuring method using the same, and more particularly, to a roll profile measuring apparatus configured to be able to accurately and easily measure a profile of a roll by being attached to one side of the roll, And a profile measurement method.

During the manufacturing process of steel products, the casting process mainly includes a hot rolling process for producing products such as hot-rolled steel sheets and a cold rolling process for producing products such as cold-rolled steel sheets.

Particularly, the roll used in the hot rolling process, which is lower than the melting point of iron but is much higher than the normal room temperature, receives a lot of heat due to the characteristics of the hot rolling process and thus may cause thermal expansion. Particularly, It can be convex.

For proper hot rolling, sufficient roll cooling water is supplied without excessive thermal expansion of these rolls. From the control point of view, the degree of expansion of the roll should be measured and / or predicted to be reflected in the control model, and the thermal expansion characteristic of the roll is determined using the data of the degree of expansion of the roll, and the thermal expansion model is tuned.

The amount of thermal expansion of the roll is indicated by the difference in diameters of the middle portion of the roll relative to both ends, and may be as small as several tens of micrometers to as large as several hundred micrometers. Thus, when the roll is locally inflated, this will affect the shape of the plate being rolled. Therefore, various factors must be taken into account in measuring and controlling the degree of expansion of the roll in a large roll barrel with accuracy of several microns.

Therefore, the roll profile measuring device should be lightweight and easy to use. However, the problem of the apparatus for measuring the degree of expansion of the roll is that the measuring apparatus is heavy and the usability is poor. In particular, the measuring device can be measured by placing a conventional measuring device having a high weight on the upper side of a roll, which is normally horizontally arranged in a single roll configuration, but it is also possible to use a two-stage or two- It is impossible or even impossible, if possible, to place a measuring device with a high weight on a roll arranged above it. Therefore, there is a problem that these devices are difficult to install and that it is difficult to accurately measure them.

On the other hand, the existing technology for the profile measurement of the roll can largely be divided into the two-arm type and the cantilever type.

The two-way beam method is a method of measuring the profile of a roll by attaching a displacement sensor (LVDT) to both arms and manually feeding the rollers equipped with the data collecting device in the roll barrel direction. To confirm the thermal expansion amount in the width direction of the roll. The main advantage of this method is that a heavy data logger is placed on the roll to minimize frame deformation, and the average of both displacement sensor data can be taken to extract highly accurate data. However, there are drawbacks. Convenience is a problem. In general, it is not an easy task to mount a weighing device on a two-tiered roll. In addition, the two sides have to set the displacement sensor on both sides, which is a troublesome aspect. And finally, it is not possible to measure the lower roll of the roll set which is normally loaded in two stages. Therefore, it is necessary to develop a method for measuring the upper and lower rolls, which is easy to measure and can be measured from one side.

To improve this, a method using a cantilever and a displacement sensor was tried. In the cantilever method, a frame equipped with a displacement sensor on a cantilever is attached to a roll surface using an electromagnet. The displacement sensor is equipped with an automatic transfer motor, which extracts the profile data of the roll while moving automatically. However, such a cantilever type method has a problem in that a large difference occurs in measurement results depending on how to attach the measuring apparatus. This is because, when the center axis of the surface of the roll and the frame of the measuring device are not aligned in parallel, the measurement data by the displacement sensor at the time of the widthwise feed is different from the actual measurement. Therefore, there is a limit in that the accurate alignment angle of the roll can not be known under the general conditions, and accordingly, there arises a problem that the degree of distortion in the profile data of the actually measured roll can not be determined.

As noted above, all of the prior art techniques did not simultaneously ensure accuracy and convenience of measurement. Therefore, there is still a need to develop an apparatus and method for measuring the profile of a roll, which can simultaneously ensure the accuracy and convenience of measuring the profile of the roll.

Korean Patent Laid-Open Publication No. 10-2011-0049348 Korean Patent Laid-Open Publication No. 10-2003-0097540

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to accurately and easily measure the profile of a roll on one side of a roll.

According to an aspect of the present invention, there is provided a fixing device comprising: fixing means fixed to a roll; A displacement reference shaft rotatably fixed to the fixing means; A long axis frame integrally fixed to the displacement reference axis and for fixing the displacement sensor in a variable manner; An angle indicating needle for indicating a slope of the long axis frame with respect to the displacement reference axis; An angle display panel on which a scale for displaying the inclination of the long axis frame is displayed according to a position of the angle indicating needles; And a displacement sensor fixed to the long axis frame so as to be changeable.

The fixing means may preferably be an electromagnet.

The profile measuring apparatus may further include an encoder integrally fixed to the displacement sensor.

The profile measuring apparatus may further include a slave assembly integrally fixed to the displacement reference shaft and a drive circuit for driving the slave assembly.

The driving circuit may preferably be a stepping motor.

The profile measuring device may further comprise a data collecting device.

According to another aspect of the present invention, there is provided a method of measuring a displacement of a roll, comprising the steps of: (1) a first measuring step of obtaining a first measured value while moving a displacement sensor at a first inclination with respect to a longitudinal axis of the roll to be measured; (2) a secondary measuring step of obtaining a second measured value while moving the displacement sensor at a second slope with respect to the longitudinal axis of the roll to be measured; (3) a third measuring step of obtaining a third measured value while moving the displacement sensor at a third slope with respect to the longitudinal axis of the roll to be measured; And (4) calculating a profile of the roll by using the first to third measured values measured from the first to third measuring steps according to Equation (1): " (1) "

[Equation 1]

According to another aspect of the present invention, there is provided a fixing device comprising: fixing means for fixing a measuring device for moving the displacement sensor at different slopes to a roll; A displacement reference shaft rotatably fixed to the fixing means; A long axis frame integrally fixed to the displacement reference axis and for fixing the displacement sensor in a variable manner; An angle indicating needle for indicating a slope of the long axis frame with respect to the displacement reference axis; An angle display panel on which a scale for displaying the inclination of the long axis frame is displayed according to a position of the angle indicating needles; And a displacement sensor fixed to the long axis frame so as to be variably fixed to the long axis frame.

According to the present invention, the profile of the roll can be measured more easily than in the conventional method. In particular, it is possible to measure not only the upper roll but also the lower roll in a set of rolls loaded with two or more rows, and it is possible to obtain consistent profile data even at a plurality of points on one roll, Can be accurately analyzed, and the effect of enabling precise tuning of the related model is provided.

1 is a plan view schematically showing an apparatus for measuring a profile of a roll according to an aspect of the present invention.
2 is a plan view showing one method of measuring the profile of a roll using the profile measuring apparatus of FIG.
3 is a plan view schematically showing an apparatus for measuring a profile of a roll according to another aspect of the present invention.
FIG. 4 is a view showing main parameters for calculating a distance according to a measurement angle in measuring a profile of a roll using the apparatus for measuring a profile of a roll according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Fig. 1, an apparatus 11 for measuring the profile of a roll according to an aspect of the present invention includes fixing means 12 fixed to a roll 1; A displacement reference shaft (13) pivotably fixed to the fixing means (12); A long axis frame 14 integrally fixed to the displacement reference shaft 13 for variably fixing the displacement sensor 17; An angle indicating needle 15 for indicating the inclination of the long axis frame 14 with reference to the displacement reference axis 13; An angle display panel 16 on which a scale is displayed so that the inclination of the long axis frame 14 can be viewed according to the position of the angle indicating needles 15; And a displacement sensor (17) fixed to the long axis frame (14) so as to be variable.

The fixing means 12 serves to fix the entire profile measuring device 11 of the roll according to the present invention to the roll 1 to be measured, preferably to the side surface of the roll 1. The fixing of the measuring device on the side of the roll 1 is not only a measurement of the profile of the roll in the configuration of a single roll but also a roll arranged in two or more stages with a configuration of a combination of a work roll and a backup roll, / ≪ / RTI > so that the profile of the roll can be easily measured even when other facilities are provided around the roll, especially at the top and bottom of the roll. Although it is exemplified in this specification to fix on the side surface of the roll, it is also possible to measure the profile of the roll by fixing the measuring device according to the present invention by means of the fixing means 12 to any exposed portion of the roll Possible is understandable. In Fig. 1, reference numeral "2 " refers to the roll neck portion.

The securing means 12 may preferably be an electromagnet. An electromagnet is a magnet that is magnetized when an electric current flows and is returned to its original state that is not magnetized when an electric current is interrupted. It is a permanent magnet that always maintains a magnetic state regardless of the supply of electric current It is a concept to be distinguished. When a current flows in a conductor, a concentric magnetic field is formed around the conductor. By using this principle, a very strong magnetic field can not be obtained with a permanent magnet. The current can be adjusted artificially to change the strength of the magnetic field relatively easily. have. Therefore, it is widely used to electromagnetic cranes that lift heavy materials above 1 t (tons) from the relay of the communication device. The entire measuring apparatus according to the present invention can be fixed to the roll 1 to be measured by the action of the magnetic field and the measuring apparatus can be freely attached and separated to the roll 1 by interrupting the current as necessary And there is no trace or damage to the roll 1 before and after the attachment.

The displacement reference shaft 13 is pivotally fixed to the fixing means 12 so that a long axis frame 14 to be described later is integrally fixed to the displacement reference axis 13. As a result, To be pivotable about the fixing means (12). With this configuration, the profile is fixed to the surface of the chain roll 1 to be measured, and the displacement is measured while moving the displacement sensor along the surface of the roll 1 at different angles, do.

Although the displacement reference shaft 13 is described herein as being pivotally fixed to the fixing means 12 and the long axis frame 14 is integrally fixed to the displacement reference shaft 13, The reverse is also possible. That is, it is also possible that the displacement reference shaft 13 is integrally fixed to the fixing means 12, and the long axis frame 14 is fixed to the displacement reference shaft 13 so as to be pivotable. Therefore, hereinafter, it is described that the displacement reference shaft 13 is pivotally fixed to the fixing means 12 and the long axis frame 14 is integrally fixed to the displacement reference shaft 13, Is also excluded.

The long axis frame 14 is integrally fixed to the displacement reference shaft 13 and serves to fix the displacement sensor 17 in a variable manner. A displacement sensor 17 which is fixed to the long axis frame 14 so as to be variable is moved along the surface of the roll 1 on which the long axis frame 14 is fixed, 17 is output as a physical quantity, and it is possible to measure the profile of the roll 1 therefrom. At this time, as described above, since the long axis frame 14 is pivotally fixed about the displacement reference axis 13 fixed to the fixing means 12, as a result, as shown in Fig. 2, It is possible to obtain a plurality of measured values while the long axis frame 14 is displaced at various angles with respect to the surface of the roll 1.

The angle indicating needle 15 and the angle indicating plate 16 function to visually indicate the degree of inclination of the long axis frame 14, particularly, the long axis frame 14 with respect to the roll 1. The angle indicating needle 15 is integrally fixed to the long axis frame 14 which is varied around the axis of the displacement reference axis 13 and the angle indicating plate 16 is fixed to the displacement reference axis 13, Is integrally fixed to the fixing means (12) which is pivotably fixed. Therefore, the angle indicating plate 16 is fixed with respect to the roll 1 without being varied, and the angle indicating needles 15 are varied with reference to the roll 1, The length of the long axis frame 14 with respect to the roll 1 can be visually indicated as an angle because it varies with the long axis frame 14. [

The displacement sensor 17 is fixed to the long axis frame 14 so as to be variable and measures a displacement amount of the profile while moving along the surface of the roll 1 to be measured. A displacement sensor is a device that detects the physical change amount of an object by various devices and converts the change amount into a distance, thereby measuring the distance of the object from the sensor. There are optical displacement sensors, linear proximity sensors and ultrasonic displacement sensors depending on the devices used. Currently, these devices are used in various parts such as warp inspection and step inspection of the board, step inspection of the automobile body. The displacement sensor 17 is fixed to the long axis frame 14 so that the displacement sensor 17 can measure the displacement amount while moving the displacement sensor 17 manually. For example, a combination of a rack and a pinion such as a pinion which is connected to an electric motor and which is driven and connected to the pinion and which performs a linear movement in association with rotation of the pinion, It should be understood that it is also possible to automatically move by means such as, for example,

Accordingly, the displacement sensor 17 is varied along the long axis frame 14, which is pivotally fixed relative to the roll 1 to be measured, and is contacted with the outer surface of the roll 1, 1 to be measured at various angles with respect to the central axis of the roll 1.

The profile measuring device 11 may further include an encoder 18 integrally fixed to the displacement sensor 17. [ An encoder is a type of digital position sensor that can measure rotational displacement and linear displacement, and is called a linear encoder or linear scale. Although their decomposition rate is generally about 1 to 10 mu m, they have obtained a higher decomposition rate by signal processing and occupy an important position as an element of a digital servo such as positioning of an NC machine or a robot. It is also used in electric micrometers and dial gauges. In the form of an output signal, there is a middle type that outputs an increase or a decrease in displacement, and an absolute type that outputs the entire measured value as it is. It has been devised based on various operating principles.

3, the profile measuring device 11 includes a slave assembly 21 integrally fixed to the displacement reference shaft 13 and a drive circuit assembly 22 for driving the slave assembly 21, As shown in FIG. This is because it is possible for an operator to manually displace the long axis frame 14 fixed to the surface of the roll 1 to be measured. However, by driving the driving circuit 22, the long axis frame 14 can be automatically . The driving circuit body 22 may preferably be a stepping motor. A step motor is an electric motor rotating at a constant angle by a pulse-like voltage. The rotation angle is proportional to the number of input pulse signals, and the rotation speed is proportional to the frequency of the input pulse signal. Accordingly, it is possible to automatically displace the long axis frame 14 with respect to the roll 1 by a predetermined angle.

The profile measuring device 11 may further include a data collecting device 19 that stores data obtained by the displacement sensor 17 and transmits the data to a computing device or the like Thereby making it possible to perform the calculation of the profile by an operation or the like. The data collecting device 19 is preferably integrally fixed to the securing means 12.

The displacement angle of the long axis frame 14 with respect to the roll 1 is not limited, but is preferably within the range of 0.5 to 5 degrees, more preferably 1 to 3 degrees, and most preferably 1 to 2 degrees. . When the displacement angle is less than 0.5 deg., The displacement angle is too small, and there is no large difference in the measured values obtained, so that even if a plurality of measured values are averaged, the error range may become large, If it is more than 5 DEG, there may be a problem that the error range may be rather increased due to the outer limit of the roll 1 and the curvature of the roll 1 or the like.

According to another aspect of the present invention, there is provided a method of measuring a displacement of a roll, comprising the steps of: (1) a first measuring step of obtaining a first measured value while moving a displacement sensor at a first inclination with respect to a longitudinal axis of the roll to be measured; (2) a secondary measuring step of obtaining a second measured value while moving the displacement sensor at a second slope with respect to the longitudinal axis of the roll to be measured; (3) a third measuring step of obtaining a third measured value while moving the displacement sensor at a third slope with respect to the longitudinal axis of the roll to be measured; And a calculating step of calculating a profile of the roll using the first to third measured values measured from the first to third measuring steps, and (4) Fixing means for fixing the measuring device to the roll to be fixed to the roll; A displacement reference shaft rotatably fixed to the fixing means; A long axis frame integrally fixed to the displacement reference axis and for fixing the displacement sensor in a variable manner; An angle indicating needle for indicating a slope of the long axis frame with respect to the displacement reference axis; An angle display panel on which a scale for displaying the inclination of the long axis frame is displayed according to a position of the angle indicating needles; And a displacement sensor fixed to the long axis frame so as to be variably fixed to the long axis frame.

The first measuring step comprises obtaining a first measured value while moving the displacement sensor at a first slope with respect to a longitudinal axis of the roll to be measured; The second measuring step comprises obtaining a second measured value while moving the displacement sensor at a second slope with respect to the longitudinal axis of the roll to be measured; And the third measuring step comprises obtaining a third measured value while moving the displacement sensor at a third slope with respect to the longitudinal axis of the roll to be measured. By using the first to third measurement steps, a plurality of measurement values are obtained at different angles, and the first to third measurement values measured from the first to third measurement steps are used to determine The profile can be calculated.

At this time, the measuring device for moving the displacement sensor at different slopes includes: fixing means fixed to the roll; A displacement reference shaft rotatably fixed to the fixing means; A long axis frame integrally fixed to the displacement reference axis and for fixing the displacement sensor in a variable manner; An angle indicating needle for indicating a slope of the long axis frame with respect to the displacement reference axis; An angle display panel on which a scale for displaying the inclination of the long axis frame is displayed according to a position of the angle indicating needles; And a displacement sensor fixed to the long axis frame so as to be variably fixed to the long axis frame, and this measurement device will avoid the same repetitive description as the measurement device according to one aspect of the present invention described above.

Particularly, in the calculating step, the profile of the roll can be calculated using the first to third measured values measured from the first measuring step to the third measuring step. For example, profile measurement data and geometric calculation It is possible to derive the profile data by linking the formulas. For this purpose, the profile data can be calculated using, for example, the Newton-Raphson method, and an exemplary calculation method will be described below.

If data of 100 points in the width direction of the roll are measured, a total of 300 pieces of data are obtained from the first to third measured values measured from the three sets, i.e., the first measuring step to the third measuring step . That is, at an arbitrary angle which is unknown, for example, 100 data at a first slope parallel to the longitudinal axis of the roll, and data at a second slope which is changed by 1 deg at the first slope is 100 The data at the third slope, which is further changed by, for example, 1 deg. In the second slope, becomes 100 data. The final distance can be calculated by using the three data obtained at one point in the width direction and using the relational expression described below. When this method is applied continuously in the width direction, profile data is created by collecting the distance data. The geometric relations for profile data extraction are summarized below.

Fig. 4 shows the detailed figure and related variable values. Here, * denotes an actual value. If 100 pieces of data are measured in the width direction, two pieces of data (w *, d ₁ *) in each measurement set, that is, 200 pieces of data are generated. Where w * is the transverse travel distance measured by the encoder and d ₁ * is the distance to the roll surface measured by the displacement sensor with an arbitrary angle. The value to be obtained in the present invention is the distance between the roll width direction distance value under perfect condition of alignment and the roll surface surface measured by the displacement sensor at that point. That is, finally, 100 (w *, d ₁ ) data is obtained, which is the profile of the roll.

First, the height difference of the sensor with displacement sensor / encoder according to the rotation angle of the long axis frame of the measuring apparatus is expressed by the following equation (1).

[Equation 1]

Then, the relationship between the roll radius at the measurement position and the coordinate value can be derived by the equation of the circle as shown in the following equation (2).

&Quot; (2) "

Also, if the alignment of the measuring device is not correct, the following equation (3) is established from the relationship between the distance between the y-axis and the measurement sensor.

&Quot; (3) "

If the above equation (2) is applied to the relationship between the measurement distances shown in the above equation, the following equation (4) holds.

&Quot; (4) "

Equation (1) can be applied to Equation (4) to derive Equation (5) as a final relation expressed by a function of the measured distance, the true distance, the roll radius, the position in the width direction,

&Quot; (5) "

Using the above equation and measuring three angles with respect to three angles, the following equations (6-1) to (6-3) can be obtained.

[Equation 6-1]

[Equation 6-2]

[Equation 6-3]

And the angular difference between the measurement sets at the time of measurement can be determined using the separator, from which the following equations 6-4 and 6-5 can be added.

[Equation 6-4]

[Mathematical Expression 6-5]

In the above equations,

h ₁ is the height of the measurement part when the alignment of the measuring device is staggered,

w ^* is the moving coordinate value from the center of the roll barrel to the point being measured,

θ is a staggered angle between roll and meter,

R is the radius of the roll at the measuring point,

d ₁ is the distance between the measuring part and the roll at the right alignment condition, is the final value to be measured by the roll profile measuring instrument,

d ₁ ^* is the horizontal distance between the measuring part and the roll surface under the condition of misalignment, and

(x *, y *) is the coordinate value at the roll surface point measured by the meter under the condition that the alignment is staggered.

(6-1), (6-2), (6-3), (6-4), and (6-5), and the unknowns are total Since there are 5 (d ₁ , R, θ ₁ , θ ₂ , θ ₃ ), all values can be obtained by solving the equation using the Newton-Raphson method.

Although the present invention has been exemplarily described in terms of approximating a Newton-Raphson method using a geometric relationship for the calculation of a profile, the present invention is not intended to be limited thereto, Possible is to be understood.

1: roll 2: roll neck
11: Profile measuring device 12: Fixing means
13: displacement reference axis 14: long axis frame
15: Angle indication needle 16: Angle indication plate
17: displacement sensor 18: encoder
19: Data collecting device 21:
22: entire drive circuit

Claims (8)

Fixing means fixed to the roll;
A displacement reference shaft rotatably coupled to the fixing means;
A long axis frame pivotally coupled to the displacement reference axis;
An angle indicating needle for indicating a slope of the long axis frame with respect to the displacement reference axis;
An angular display panel having a scale for enabling the inclination of the long axis frame to be viewed according to the position of the angle indicating needles;
A single displacement sensor coupled to the long axis frame such that the long axis frame is positionally variable along the longitudinal direction of the long axis frame to measure the distance from the roll at a plurality of angles in accordance with the turning motion of the long axis frame;
A computing device,
Wherein the calculating device calculates the displacement of the long axis frame by the displacement sensor when the displacement distance between the displacement reference axis and the displacement sensor is w * A first measurement value d2 * measured by the displacement sensor in a state in which the long axis frame is tilted at a second tilt? 2 with respect to the axis of the roll, Axis frame is aligned with the axis of the roll by the following equation using the third measured value d3 * measured by the displacement sensor while tilting at the third tilt? 3 with respect to the axis of the roll And the distance d1 between the displacement sensor and the roll is calculated.
[Mathematical Expression]

R is the radius of the roll at the measurement point The method according to claim 1,
Wherein the fixing means is an electromagnet. The method according to claim 1,
Further comprising an encoder in which the profile measuring device is integrally fixed to the displacement sensor. The method according to claim 1,
Wherein the profile measuring device further comprises a driven assembly integrally fixed to the displacement reference shaft and a drive circuit for driving the driven assembly. 5. The method of claim 4,
Wherein the driving circuit is a step motor. The method according to claim 1,
Wherein the profile measuring device further comprises a data collecting device. A longitudinal axis frame rotatably coupled to the displacement reference axis; and an angle indicator indicating a slope of the long axis frame on the basis of the displacement reference axis, And an angle display panel on which a scale for displaying the inclination of the long axis frame is displayed in accordance with the position of the angle indicating needles; an angle display panel which is coupled to the long axis frame so as to be positionally variable along the longitudinal direction of the long axis frame, A profile measuring method using a roll profile measuring apparatus including a single displacement sensor for measuring a distance from a roll at a plurality of angles in accordance with a turning operation of a long axis frame,
(1) When the displacement distance between the displacement sensor and the displacement reference axis is w *, the long axis frame is tilted at a first slope? 1 with respect to the axis of the roll, and the first measurement value d1 *), < / RTI >
2) When the displacement distance between the displacement sensor and the displacement reference axis is w *, the second measurement value d2 * is measured using a displacement sensor in a state in which the long axis frame is tilted with respect to the axis of the roll at the second inclination [ );
(3) When the displacement distance between the displacement sensor and the displacement reference shaft is w *, the long axis frame is tilted at a third slope? 3 with respect to the axis of the roll, and the third measured value d3 *); ≪ / RTI > And
(4) Using the first to third measured values (d1 *, d2 *, d3 *) measured from the primary measuring step to the tertiary measuring step, A distance d1 between the displacement sensor and the roll in a state aligned with the axis of the displacement sensor;
And measuring a profile of the roll using the roll profile measuring apparatus.
[Mathematical Expression]

R is the radius of the roll at the measurement point delete

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