JPH1144518A - Apparatus for measuring caliber shape and method for adjusting shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately measure a caliber to allow adjustment amounts in two directions including a thrust direction and a press-down direction of a roll to be calculated by moving and positioning either a rolling stand or a caliber measuring means, and calculating a roll adjustment amount with image pickup data received from the caliber measuring means. SOLUTION: A four-roll rolling stand 20 whose caliber shape is to be adjusted is mounted and positioned on a table at an unloading position of the four-roll rolling stand 2 of a slide table 7 and is moved to a caliber measuring position. At this time, respective rolls are kept pressed to open in a press-down direction by a rattling removing jig 22. Subsequently, a gap pin 4 is set on a pushing face 2, and a side of the four-roll rolling stand is pressed by a push rod 5, whereby the other face of the four-roll rolling stand is pressed against an end face of the gap pin 4. Then a roll rotating shaft face is adjusted in posture so that it is in parallel with the pushing face 2, and an image of the caliber is picked up.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for adjusting the shape of a caliber of a multi-roll rolling stand for rolling a wire rod with multiple rolls.

[0002]

2. Description of the Related Art A rolling space formed by combining two or more grooved rolls is called a roll caliber or a caliber. A rolled material is passed through this caliber, and various rolling reductions are applied thereto. Manufactures rolled material with a cross-sectional shape. In order to produce rolled products with high precision, it is important that the shape of the caliber is accurately adjusted.Therefore, the displacement of the rolls forming the caliber is inspected with high precision, and the caliber is formed into a predetermined caliber shape. It is necessary to correct the gap of the roll so that it reaches. The method of inspecting the shape of the caliber can be done by directly applying a reference gauge to the roll to check the shape, or by enlarging and projecting the caliber shape on a screen using a magnifying projector and inspecting it visually. There is a way to correct the gap. However, the gauge method is suitable
There is a problem that only improper distinction can be made, and the visual adjustment of the inspector has a problem that the caliber shape after the adjustment is likely to vary, and a problem that the inspector places a large burden on the inspector and takes time.

As a method for solving such a problem, Japanese Patent Application Laid-Open No. Hei 8-5343 is disclosed. This method irradiates a caliber consisting of three rolls with uniform and parallel light having a cross section larger than that of the caliber, and enlarges the contour of the caliber shaded by the rolls with a lens and projects it on a translucent screen. A number of images are taken while moving the camera device along the contour of the caliber from the opposite side of the screen, the contour of the caliber is converted into a video signal, the edge position of the caliber is detected from this video signal, and the obtained plurality is obtained. The caliber shape is calculated from the edge position of (1). The method of calculating and adjusting the amount of deviation is to find an equilateral triangle circumscribing the calculated caliber and to use the center of gravity as the center point of the caliber, calculate the approximate circle of the caliber contour formed by each roll, and calculate the approximate point of the approximate circle. The deviation from the center of gravity is regarded as a deviation of the roll, and the roll is moved in the thrust direction so as to eliminate the deviation.

[0004]

However, the method disclosed in Japanese Patent Application Laid-Open No. H8-5343 has the following problems.
The first problem is the problem of caliber measurement accuracy, which is caused by moving the camera device along the contour of the caliber in order to determine the caliber shape. That is, mechanical backlash is inevitable in the camera moving device. Particularly, when an attempt is made to measure a small caliber having an outer diameter of about several mm with an accuracy of the order of μm, this causes a large measurement error.
Further, when calculating the outline coordinates of the caliber, it is necessary to calculate the position information of the camera device, but the calculation may be complicated and an error may occur.

[0005] A second problem is that it can only be applied to very limited rolling stands where the rolls can only be moved in the thrust direction. Therefore, this method cannot be used when the shape of the caliber must be adjusted by moving the roll in both the thrust direction and the rolling direction for precise rolling. An object of the present invention is to provide a caliber shape measuring device which measures a caliber with extremely high accuracy and calculates an adjustment amount in two directions of a roll thrust direction and a roll-down direction based on the caliber, and a caliber shape. To provide an adjustment method for

[0006]

A caliber shape measuring apparatus according to the present invention is an apparatus for measuring a caliber formed by combining a plurality of grooved rolls, and calculating a roll movement amount. Caliber measurement means for imaging the entire caliber in one field of view via a projection lens, and measurement for moving and positioning at least one of the roll rolling stand or the caliber measurement means so that the caliber of the roll rolling stand is at a predetermined position with respect to the caliber measurement means. It is characterized by comprising a positioning device and a control device that receives the imaging data from the caliber measuring device and calculates a roll adjustment amount based on a preset logic.

Further, according to the caliber shape adjusting method of the present invention, an image of the entire caliber formed by combining a plurality of grooved rolls is taken in one field of view, and the caliber contour image formed by each roll is used to determine the end of the roll caliber. The roll angle coordinate of the roll to be moved is calculated based on the roll moving order set in advance so that the angle of the roll to be moved is located at a predetermined position with respect to the angle of the partner roll. It is characterized in that the roll is moved between the two. In particular, when the caliber has a circular shape composed of four rolls, in addition to the roll angle point coordinates, the caliber arc center point, or the outermost circumscribed dimension that is the distance between the circumscribed circles of the calibers of the opposing rolls is calculated, and these are appropriately calculated. The appropriateness of the adjustment can be determined in combination.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment will be described based on an example in which a caliber shape measuring apparatus of the present invention is applied to a four-roll rolling stand. FIG. 2 shows a front view of the four-roll rolling stand 20 viewed from the rolling direction. The four-roll rolling stand 20 is composed of four disc-shaped rolls 21 (21a, 21b, 21c, 21d) each having a circular groove at the tip end.
So that the shape of the caliber 23 is circular, and the roll rotation axis center line 24 (24a, 24a) of each roll.
b, 24c, 24d) are on the same plane, that is, the roll rotation axis surface 2
7 (see FIG. 3). The roll 21 is moved in the rolling direction 25 (25a, 25b,
25c, 25d) and the thrust direction 26 (26a, 26
b, 26c, 26d), and a total of eight axes must be precisely adjusted for caliber formation before rolling (the adjustment mechanism is not shown).

FIG. 1 is a side view of a caliber shape measuring device. The caliber shape measuring device includes a caliber measuring means for imaging the caliber, a measuring position aligning means for loading the four-roll rolling stand 20 and positioning the caliber at a predetermined position with respect to the caliber measuring means, Rolling stand posture correcting means for correcting the posture of the four-roll rolling stand 20 so as to be orthogonal to the optical axis of the means, a gantry 8 for mounting these, and image data from the caliber measuring means, and based on logic set in advance. A control device (not shown) for calculating the roll adjustment amount. Also, the four-roll rolling stand 20
Is equipped with a play removing jig 22 (22a, 22b, 22c, 22d) that acts to push and spread the roll 21 in the rolling direction so that the roll 21 is in the same state as in rolling.

The caliber measuring means is provided on one side of the four-roll rolling stand 20 for irradiating the caliber 23 with uniform and parallel light having a cross section larger than that of the caliber 23; A projection lens 11 attached to a pressing jig 3 (to be described later) arranged on the other side and capable of changing the magnification of a caliber image formed through the caliber 23, and capturing a caliber image via the projection lens 11. CCD
And an imaging device 12 such as a camera. Parallel light illumination device 1
0, the projection lens 11 and the imaging device 12 are arranged such that their optical axes coincide, and the optical axes are collectively referred to as the optical axis 13 of the caliber measuring means. The imaging device 12 is fixedly set and images the caliber 23 in one field of view. Therefore, the magnification of the projection lens 11 can be freely set so as to be enlarged or reduced by a combination of an intermediate lens or the like as appropriate in accordance with the measurement accuracy in consideration of the size of the caliber 23 and the resolution of the imaging device 12.

The measuring position adjusting means comprises, for example, a slide table 7 on which the four-roll rolling stand 20 can be loaded at a predetermined position, and can move between the unloading position of the four-roll rolling stand 20 and the caliber measuring position. In the caliber measurement position, the position is adjusted so that the optical axis 13 of the caliber measuring means is substantially at the center of the caliber 23. In addition, four roll rolling stand 2
The caliber measuring means may be moved while 0 is fixed, and an appropriate configuration can be appropriately adopted depending on the rolling system.

The rolling stand posture correcting means corrects the posture of the four-roll rolling stand 20 so that the roll reduction direction is perpendicular to the optical axis 13 of the caliber measuring means, and is perpendicular to the optical axis 13 of the caliber measuring means. A pressing jig 3 having a pressing surface 2 and fixed to the gantry 8, a pressing surface 2 or a roll rotating shaft surface 27 set on one side of a four-roll rolling stand 20 and being parallel to the pressing surface 2 and It has a gap pin 4 whose length is set to be a distance determined by the focus of the projection lens 11, and a push bar unit 6 that pushes the other side of the four-roll rolling stand 20 via the push bar 5.

The operation of the caliber shape measuring device will be described below. Four-roll rolling stand 2 for slide table 7
At the zero loading / unloading position, the four-roll rolling stand 20 whose caliber shape is to be adjusted is placed and positioned on the table and moved to the caliber measurement position. At this time, jig 2
Each roll is pushed open in the rolling direction by 2. Subsequently, the gap pin 4 is set on the pressing surface 2, the push rod unit 6 is moved forward, and the push rod 5 pushes the side surface of the four roll rolling stand, so that the other surface of the four roll rolling stand faces the end face of the gap pin 4. , And the posture is adjusted so that the roll rotation shaft surface 27 is parallel to the pressing surface 2, and an image of the caliber 23 is taken.

FIG. 3 shows an optical explanatory view of the caliber measuring means. The collimated light 14 emitted from the collimated light illumination device 10 is applied to a roll 21 of a four-roll rolling stand 20.
And only the light that has passed through the caliber 23 reaches the projection lens 11. The roll rotation axis surface 27 is orthogonal to the optical axis 13, so that the projection lens 11
An outline formed by the intersection of the roll 7 and the roll 21 is formed on the imaging surface 15 of the imaging device 12. This figure shows the caliber outer diameter is several meters
m, and shows an example in which the caliber 23 is magnified several times to capture an image.

FIG. 4 is a photograph showing an image of the caliber section taken by the image pickup device 12 and displayed on the display. The central part corresponding to the caliber 23 is bright, and the part corresponding to the roll 21 for blocking light is a dark image. Four bright lines perpendicular to the contour of the caliber are gaps formed by the ends of the round grooves formed on the respective rolls with the ends of the round grooves formed on the adjacent rolls. In the roll of this example, as shown in FIG. 2, the end 18 of the round groove processed portion is tapered. The image data of the caliber section taken by the image pickup device 12 is sent to the control device, and firstly, various measurement values set in advance, which will be described later, are calculated, and then the measurement values are used to calculate an adjustment amount for caliber shape adjustment. The adjustment procedure is output on a screen or printout.

FIG. 5 is a diagram for explaining various measured values set to be calculated for a circular caliber consisting of four rolls, each of which will be described below. First, in order to calculate these measured values, of the imaging lines extracted by binarization or the like from the captured image, the caliber contour formed by the round groove processing portion of each roll 21 is replaced with the central part contour which is the central part contour. 39 (39a, 39b, 39c, 39d) and end contours 34 (34ab, 34ad, 34b) which are contours of both ends.
c, 34ba. . ), And the contour of the tapered portion forming both ends of the round grooved portion of the roll is changed to a tapered portion contour 36.
(36ab, 36ad, 36bc, 36ba ...). Here, in each code, the alphabet immediately after the numeral represents the corresponding role, and the next alphabet represents the adjacent role. Hereinafter, the same applies to other symbols.

First, the outermost circumscribed dimension value 31 and the sectional area 32 will be described. The outermost circumscribed dimension value 31 is a maximum distance between opposing rolls of the rolls 21. In FIG. 5 (a),
For example, the outermost circumscribed dimension 31ac is equal to the roll 21a and the roll 21.
c, which is a distance between an external tangent line 33a circumscribing the caliber contour of the roll 21a and parallel to the Y axis and an external tangent line 33c circumscribing the caliber contour of the roll 21c and parallel to the Y axis. Similarly, the outermost circumscribed dimension value 31bd
external tangent line 33b circumscribing the caliber profile b and parallel to the X axis
And the outer tangent line 33d circumscribing the caliber contour of the roll 21d and parallel to the X-axis.

The cross-sectional area 32 is the area of the caliber 23. Since the caliber contour breaks at the boundary of each roll, for example, extend the end contour of each roll and close the caliber contour using one of the points that intersect the tapered contour of the adjacent roll. It can be obtained as a cross-sectional area by calculating the area inside the shape.

Next, the roll angle point 38 will be described with reference to FIG. The roll angle point 38 is an end approximation line 35 (35ab, 35ac,
35bc, 35ba. . ) And a taper portion approximation line 37 (37ab, 37a) obtained by approximate calculation of the taper portion contour 36.
c, 37bc, 37ba. . ), And there are two locations for each roll. The distance between the corner points of adjacent rolls is referred to as a corner point deviation 42. For example, roll 21
The roll angle point 38ab is determined from the intersection of the end approximation line 35ab and the tapered portion approximation line 37ab on the roll 21b side, and from the intersection of the end approximation line 35ba and the tapered portion approximation line 37ba on the roll 21a side of the roll 21b. Corner point 38b
a is required. Roll angle point 38ab and roll angle point 38
A corner point deviation 42ab is obtained from ba. Angle point deviation 42ab
Indicates a deviation between the rolls 21a and 21b. In this example, the end approximation line is obtained by circular approximation. However, depending on the caliber shape, approximation calculation according to the original shape of the roll, such as linear approximation or elliptical approximation, may be performed.

Next, the contour center point 41 will be described with reference to FIG. The contour center point 41 is a central approximation line 40 (40a, 40b,
40c, 40d). The distance between the two center points is defined as the center point deviation. For example, from the approximate line 40a at the center of the roll 21a, the contour center point 41a is
An outline center point 41b is obtained from the central approximate line 40b of b. Center point deviation 43a from contour center points 41a and 41b
b can be obtained. The center point deviation 43ab also indicates a deviation between the rolls 21a and 21b.

Next, the logic for adjusting the caliber shape and the calculation of the adjustment amount based on this will be described with reference to FIG. FIG. 6A is an example showing an approximate line of a caliber contour formed by a roll before adjustment. First check if the roll is adjustable. For example, roll 21
For d, the contour center point 41d and the roll angle point 38dc, 3
The roll boundary 60 (60da, 60dc) connecting 8da is drawn, and the measured value of the other roll (roll angle point 38,
It is calculated whether or not there is a contour center point 41). This is done for each roll, and if no such measurement exists, it is made adjustable and the process proceeds to the next step. FIG. 6A shows an adjustable state. The calculation can be performed by a known image processing method. In the event that the roll exists, it is difficult to adjust the roll, or there is noise such as dust on the imaging target portion of the roll, and the measured values described above cannot be correctly calculated by image processing. It is necessary to review the state of, and it is output to that effect.

Next, a reference roll is selected. The selection criteria are
For example, it may be appropriately determined such that the contour center point is closest to the center of the imaging screen, or the caliber contour has the smallest inclination with respect to the normal state. Here, description will be made assuming that the roll 21d is selected as a reference. First, roll 21d
The movement amount is calculated so that two adjacent rolls 21a and 21c approach the roll 21d. Whether to move in the rolling direction or the thrust direction first is determined in advance based on the shape of the tip of the roll so that the roll does not interfere. Here, a description will be given assuming that the moving is performed from the rolling-down direction. Each roll movement amount is calculated as a value obtained by subtracting a predetermined gap amount 53a that can be set from a predetermined gap between the rolls from the X-axis direction component value of the corner point deviation 43ad for the roll 21a. The quantity 53a can be obtained by calculation as a value obtained by subtracting the X-axis direction component value of the angular point deviation 43cd. On the other hand, the target outermost dimensional value 50ac can be set from the dimensions of the rolled material, and the value obtained by subtracting this value from the outermost dimensional value 31ac obtained from the rolls 21a and 21c is the total amount 51ac of the rolling direction. Become. Theoretically, each roll 21a, 2
The sum of the movement amount of 1c is the total movement amount 5 in the rolling direction.
It should be 1ac, and the quality of the measurement can be checked by calculating whether this difference is within a predetermined allowable value. In the case of a failure, an output to that effect is output and the processing is stopped. FIG. 6B shows a virtual caliber state when the rolls 21a and 21c are moved in the rolling direction. The movement of each of the rolls 21a and 21c is performed at the contour center point 41a.
And 41c are positioned at the center of the roll 21d (contour center point 41).
d may be a line parallel to the Y axis, or a roll angle point 38d
(c may be a line passing through the center of 38da and parallel to the Y axis) or may be moved so as to have a predetermined equal interval.

Next, the amount of movement when the rolls 21a and 21c are moved in the thrust direction is calculated. If the roll moves, its corner point position changes, so that a new corner point position is used for subsequent adjustment amount calculation. Each roll movement amount is calculated as a value obtained by subtracting the predetermined gap amount 54a for the roll 21a from the Y-axis direction component value of the corner point deviation 43ad, and for the roll 21c, the gap amount 54a is calculated as the Y value of the corner point deviation 43cd. It can be calculated as a value subtracted from the axial component value. FIG. 6C shows a virtual caliber state when the rolls 21a and 21c are moved in the thrust direction. Angle deviation 43
bc and 43ab are newly calculated.

Next, the moving amount of the remaining roll 21b is calculated. Which of the rolling direction and the thrust direction is to be moved first is determined in advance as described above. Here, it is assumed that the thrust direction is moved first. The amount of movement is the angle deviation 4
Based on 3bc and 43ab, the corner point 38ba after the movement of the roll 21b is located inside the corner point 38ab of the roll 21a, and the corner point 38bc is located inside the corner point 38cb of the roll 21c. The gaps in the X-axis direction at the corner points to be set are the same. FIG. 6D shows a virtual state after the roll 21b has moved. In this case, it is preferable to check that the gap in the X-axis direction is within a predetermined allowable range with respect to the gap amount 53a. If it is not within the allowable range, an alarm output can be issued as a measurement failure.

Finally, the roll 21b may be moved in the rolling direction. The movement amount can be calculated as a value obtained by subtracting the predetermined gap amount 55a from the Y-axis direction component value of the corner point deviation 43ab or the corner point deviation 43bc. Further, it can also be obtained as an amount obtained by subtracting 50 bd which is the target outermost circumscribed dimension value from the outermost circumscribed dimension value 31 bd. At this time, the quality of the measurement can be checked in the same manner as described above. An imaginary view of the adjusted caliber shape after the roll movement is shown in FIG. As described above, the control device outputs the moving amount based on the preset moving order of each roll on a screen or printout. The operator can manually adjust the position of each roll based on this to make the shape of the caliber desirable. In addition, for a roll rolling stand having an adjusting means capable of automatically moving each roll, it is possible to output to the roll position adjusting means each time and automatically move the position of the roll. The output form from can be appropriately adjusted according to the target roll rolling stand.

Although the above description has been made on the case where the shape of the caliber is a round shape of four rolls, a specific measurement value is set in advance also for those other than the four rolls, for example, those of three rolls or non-circular calibers. The concept of calculating and calculating the adjustment amount based on the calculation is basically applicable. At this time, since the caliber shape is measured by one imaging, this calculation can be easily and accurately performed.

[0027]

According to the present invention, the following effects can be obtained. 1) Since the entire caliber is imaged in a single image, the configuration of the apparatus is extremely simple. Since there is no movable part, highly accurate and highly accurate measurement is possible. 2) Since the amount of movement of each roll is calculated by one imaging, there is no need to re-image each time one roll is moved, and adjustment with high work efficiency can be performed. 3) The caliber shape can be adjusted with good reproducibility because the adjustment of the roll does not require or need to consider by the operator.

[Brief description of the drawings]

FIG. 1 is a side view of a caliber adjustment device according to the present invention.

FIG. 2 is a front view of a four-roll rolling stand.

FIG. 3 is an optical explanatory view of the caliber adjusting device of the present invention.

FIG. 4 is a photograph of a halftone image displaying a caliber consisting of four rolls on a display.

FIG. 5 shows measured values for a caliber consisting of four rolls.

FIG. 6 is an explanatory view of a procedure for adjusting a caliber consisting of four rolls.

[Explanation of symbols]

3: pressing jig, 6: push rod unit, 10: parallel light illumination device, 11 projection: lens, 12: imaging device,
13: Optical axis, 14: Parallel light, 20: Four-roll rolling stand, 21: Roll, 22: Jig, 23
... caliber, 25 ... rolling direction, 26 ... thrust direction, 31 ... outermost dimensional value, 38 ... roll angle point, 37
... taper approximate line, 41 ... center point of contour,

Claims (2)

[Claims] 1. A caliber shape measuring device for imaging a caliber formed by combining a plurality of grooved rolls and calculating a roll movement amount, wherein the caliber captures the entire caliber in one visual field via a projection lens. Measuring means, measuring positioning means for moving and positioning at least one of the roll rolling stand or the caliber measuring means so that the caliber of the roll rolling stand is at a predetermined position with respect to the caliber measuring means, and receiving image data from the caliber measuring means. A caliper for calculating a roll adjustment amount based on a preset logic. 2. An image of the entire caliber formed by combining a plurality of grooved rolls in one visual field, and calculating a roll angle point coordinate of an end of the roll caliber from a caliper contour image formed by each roll, Based on the set roll movement order, the movement amount is calculated such that the corner point of the roll to be moved is located at a predetermined position with respect to the corner point of the other roll,
A method for adjusting the shape of a caliber, characterized in that a roll is moved based on this.