JP2002098514A - Method for measuring profile section of three roll mill rolled material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure with high accuracy, using an inline measuring device, a rectangular profile section of rolled material which is metal such as a steel bar or a steel wire, after rolled with a three roll mill. SOLUTION: The rectangular profile section of the rolled material is determined by installing at least six sets of a sensor of a beam projection method composed of a set of an emitter and a receiver which projects and receives a light beam vertically to the axis of the rolled material in a same rectangular sectional plane of the rolled material, which sets of the sensors are fixed at the delivery side of the three roll mill around the axis of the rolled material with a same interval of a circumferential angle, three sets of which six sets are fixed so as to make a light beam direction parallel respectively with the three axes of said three rolls, and detecting simultaneously the peripheral position of the rolled material with each of these sensors. The reduction of the rolled material with the three roll mill is preferably lower than 12%, and the sets of the sensors are preferably installed within a distance of a hundred times length of the rolled material diameter from the center of the three roll mill.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for in-line measurement of a right-angle cross-sectional profile of a rolled material by a three-roll rolling mill at a rolling mill exit side, for a rolled material of a metal material such as a bar or a steel wire. It is.

[0002]

2. Description of the Related Art When rolling a bar or rod made of a metal material such as a steel bar or a steel wire, the rolled material may be extruded or have dimensional defects due to poor rolling adjustment of a roll. For this purpose, a sample is cut out from the rolled material and observed and measured for the diameter, or a right-angle cross-sectional profile of the rolled material is obtained by in-line measurement on the exit side of the rolling mill, and the reduction is adjusted by feedback.

In order to improve the shape and dimensional accuracy of the rolled material, there is known a rolling line in which a three-roll rolling mill is used as a final stand for finish rolling or a final stand and a final front stand. In a rolled material such as a bar or a wire, there is a portion that is not in contact with the caliber and is not restricted by the roll, between portions that are rolled in contact with the roll caliber. In the present specification, the former is referred to as a restricted part, and the latter is referred to as a non-restricted part. In a three-roll rolling mill, unconstrained portions are formed at three locations in the circumferential direction at 120 ° intervals, and bites appear at these portions.

[0004] As an in-line measurement technique of a cross section profile of a rolled material, a projection lamp for irradiating a rolled material with a light of a halogen lamp or a laser beam as a parallel beam by a light projecting lens and measuring the shadow dimension of the rolled material by an image sensor or the like. The beam method is known. In the conventional projection beam method,
By rotating an optical system consisting of a projector and a light receiver in the circumferential direction of the rolled material, the diameter was measured over the entire circumference of the rolled material to obtain a profile.

When the profile of a rolled material is measured by a conventional three-roll rolling mill by the conventional projection beam method, it is difficult to detect the presence or absence of excavation because the unconstrained portion is asymmetric in the diameter direction. There is a problem that both the minimum values are affected by exudation and that accurate measurement cannot be performed.

As a countermeasure against this problem, Japanese Patent Laid-Open No. Hei 7-2868.
No. 26, the reference body that blocks a part of the laser in the optical path from the light emitter to the light receiver is provided, and the distance signal based on the shadow of the material to be measured and the reference body and the rotation angle of the optical system are calculated. Methods and apparatuses for determining the cross-sectional shape of a material to be measured have been proposed. According to this technique, even in the case of a three-roll rolling mill, the perpendicular cross-sectional profile of the rolled material can be measured, and the presence, absence, position, height, and diameter of the entire circumference can be measured.

[0007]

However, in the technique disclosed in the above publication, the measurement is performed by rotating the optical system including the light emitter and the light receiver around the rolled material, so that there is a time difference in the measurement in the circumferential direction of the rolled material. Further, when the rolled material is twisted in the same direction as the rotation direction, it becomes increasingly difficult to measure the entire circumference. For this reason, the in-line measurement of the rolled material that has been rolled and running cannot measure the same perpendicular cross-sectional profile of the rolled material.

[0008] Therefore, it is necessary to take a sample from the end of the rolled material, measure the size and observe it, and adjust the roll reduction, thereby increasing the number of times of sampling, operating problems such as line stoppage and deceleration, and the yield of rolled material. Problems such as a decrease have occurred. The problem to be solved by the present invention is to measure a cross section profile perpendicular to a rolled material with high accuracy in-line after rolling a rolled material of a metal material such as a bar or a steel wire by a three-roll rolling mill.

[0009]

According to a method of the present invention for solving the above-mentioned problems, three roll axes intersect in a plane including a right-angle cross section of a rolled material to form an equilateral triangle, and a caliber of each roll is formed. Projection beam method consisting of a pair of a projector and a receiver for projecting and receiving a beam perpendicular to the rolled material axis within the same right-angle cross section of the rolled material on the exit side of a three-roll rolling mill having a circular arc and a relief surface on both sides. , At least six pairs of sensors are fixedly arranged at equal angular intervals in the circumferential direction around the rolled material axis, and three pairs of them are fixedly arranged so that the beam directions are parallel to the three roll axes, respectively. A profile measurement method for a three-roll rolled material, wherein a profile of a right angle cross section of a rolled material is obtained by simultaneously detecting an outer peripheral point position of the material. And in the method of the present invention, the reduction rate of the rolled material in the three-roll rolling mill is set to 12% or less,
It is preferable that each of the sensors is fixedly arranged at a position within 100 times the diameter of the rolled material from the center of the three-roll rolling mill.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention is a method of measuring a right-angle cross-sectional profile of a rolled material 2 by fixing a sensor 3 by a projection beam method on the exit side of a three-roll mill 1 as shown in FIG. is there. The three-roll rolling mill 1 may be connected to one machine or two or more machines. The rolling may be hot rolling or cold rolling. The sensor 3 includes a pair of a light emitter and a light receiver, and is located at a position corresponding to each roll arrangement of the three-roll mill 1.
It is fixedly arranged in pairs or more, and does not rotate as in the conventional method.

In the three-roll mill 1, as shown in the example of FIG. 2, three rolls 4, 5, and 6 having calipers are rotated about a roll axis 7 to roll the rolled material 2. The roll axes 7 of the rolls 4, 5, 6 intersect in a plane including a right-angled cross section of the rolled material 2 to form an equilateral triangle ABC. Escape surface 9
Consists of The perpendicular section of the rolled material 2 is a section perpendicular to the rolling direction. On the surface of the rolled material 2, a constrained portion 23 that is rolled in contact with the arc 8 of the roll caliber and a non-constrained portion 24 that is not constrained by the roll are formed between the relief surface 9.

In the example shown in FIG. 2, six pairs of sensors 3 are provided. That is, there are six pairs of the projector 11 and the receiver 17, the projector 12 and the receiver 18, the projector 13 and the receiver 19, the projector 14 and the receiver 20, the projector 15 and the receiver 21, and the projector 16 and the receiver 22. Each of the floodlights 11, 12, 13, 14,
Reference numerals 15 and 16 denote circumferential directions around a rolled material axis (a straight line in the rolling direction passing through the center of the right-angled cross section and perpendicular to the plane of FIG. 2).
The beams 10 are fixedly arranged at equal angular intervals of 0 °, project a beam 10 perpendicularly to the axis of the rolled material at the same right-angle cross section of the rolled material 2, and receive light with the respective light receivers 17, 18, 19, 20, 21 and 22. The shadow 25 of the rolled material 2 is measured simultaneously.

Three of the six pairs of sensors are fixedly arranged with their beam directions parallel to the three roll axes 7 (corresponding to each side of the equilateral triangle ABC). In the example of FIG. 2, the light emitter 11 and the light receiver 17 are fixedly arranged in parallel with the side CA, the light emitter 13 and the light receiver 19 are fixedly arranged in parallel with the side AB, and the light emitter 15 and the light receiver 21 are fixedly arranged in parallel with the side BC. I have.
The interval between the light emitters 11, 13, 15 is 60 °.

By the three pairs of sensors arranged in this manner, three points corresponding to the bottom of the roll caliber of the constrained portion 23 and three non-constrained portions opposed to this portion on the outer periphery of the same right-angled cross section of the rolled material 2, The positions of six points are detected. The portion corresponding to the bottom of the roll caliber is the center of the constrained portion 23 by the arc 8 of the caliber. That is, the beam 10 emitted from the light projector 11 is received by the light receiver 17 and the shadow 25
By measuring the two points, the central part of the constrained part 23 by the roll 5 on the outer periphery of the rolled material 2 at a right angle cross section indicated by the oblique line and the central part of the non-constrained part 24 between the rolls 6 and 4 opposing it To detect.

Similarly, the beam 10 emitted from the projector 13
At the central portion of the constrained portion 23 by the roll 4 and the central portion of the non-constrained portion 24 between the rolls 5 and 6 opposed thereto, and the beam 10 emitted from the light projector 15 is detected. Is received by the photodetector 21 to detect two points, that is, the central part of the constrained part 23 by the roll 6 and the central part of the non-constrained part 24 between the rolls 4 and 5 opposed thereto.

The other three pairs of the six pairs of sensors are:
It is fixedly arranged between the three pairs of sensors. In this example, the projector 12 is provided between the projector 11 and the projector 13, the projector 14 is provided between the projector 13 and the projector 15, and the projector 15 and the receiver 1 are provided.
7, the light projectors 16 are fixedly arranged, respectively,
, A light receiver 20 facing the light emitter 14, and a light receiver 22 facing the light emitter 16. In this example, six light projectors 11 to 16
And the interval between the six light receivers 17 to 22 is 30 °.

The beam 10 emitted from the light emitter 12 is received by the light receiver 18 and the shadow 25 by the rolled material 2 is measured, whereby
Two points, a constrained portion 23 by the roll 4 and a constrained portion 23 by the roll 5, are detected on the outer periphery of the rolled material 2 at a right angle cross section indicated by the oblique lines. In the same manner, two points of the constrained part 23 by the roll 4 and the constrained part 23 by the roll 6 in the light emitter 14 and the light receiver 20 are combined with two parts of the constrained part 23 by the roll 5 and the constrained part 23 by the roll 6 in the light emitter 16 and light receiver 22. Each point is detected. A total of six points of the constrained part 23 detected here are points separated by 30 ° on both sides from three central parts of the constrained part 23 detected by the three pairs of sensors.

In this embodiment, as described above, six pairs of sensors are fixedly arranged at equal intervals in the circumferential direction of 30 ° around the rolled material axis, and three pairs of which have the beam directions of three roll axes 7 respectively. By arranging in parallel, the center of the caliber arc 8 and the point 30 ° away from the center of the caliber arc 8 in the constrained portion 23 by the three rolls on the outer periphery of the rolled material 2 at a right angle
It is possible to simultaneously detect the point and the central three points of the unconstrained part 24, that is, a total of 12 points.

As a method of obtaining the right-angle cross section profile, for example, the following method can be adopted, but the method is not limited to this. The above detected 12 points and 3
The right-angle cross-sectional profile of the rolled material 2 is determined based on the caliber shape of each of the rolls 4, 5, and 6 of the roll rolling mill. First, with respect to the constrained portion 23 of the rolls 4, 5, 6 by the arc 8, the arc connecting the three detection points is drawn to a position corresponding to the boundary with the relief surface 9. Next, the boundary position is connected to each one of the detection points of the unconstrained portion 24. The shape of the connecting line can be determined in advance based on shape data of a non-constrained portion collected in advance in a sample, such as excavation of a rolled material 2 of the same material and the same size. In addition, it is a matter of course that the diameter of each part in the same perpendicular cross section can be measured.

In the method of the present invention, the sensors arranged at equal intervals between three pairs of sensors arranged in parallel with the three roll axes 7 are one pair each as shown in FIG. By arranging two or more pairs as required, the obtained profile is closer to the actual profile. The sensors in the three pairs can be arranged at equal intervals or can be arranged at appropriate positions. In addition to the same number between the three pairs, for example, two pairs each have one pair, and one pair has two pairs.
Can be paired.

In the method of the present invention, the positional relationship between the rolls 4 to 6 of the three-roll mill 1 and the projectors 11 to 16 and the light receivers 17 to 22 of the sensor 3 is determined and fixed as described above. A right-angle cross-sectional profile of the rolled material 2 can be obtained based on this positional relationship and the detection points of the light receivers 17 to 22. The obtained profile is the same perpendicular cross-sectional profile of the rolled material even after rolling at high speed running, and the problem that the measurement position in the cross section is shifted in the rolling direction as in the conventional method is solved.

Even if the sensor 3 is fixedly arranged and measured simultaneously as in the method of the present invention, if the rolled material 2 exiting the three-roll rolling mill 1 is twisted, the positional relationship between the measurement point and the roll caliber is shifted. This is a factor that causes an error when the right-angle cross-sectional profile is obtained. In the three-roll rolling mill 1, twist occurs after rolling depending on the posture of the rolled material 2 when the rolled material 2 bites into the rolls 4, 5, and 6, and when the surface reduction rate is too high, the material tends to rotate in the thrust direction. And twisting occurs. Therefore, it is desirable to measure at a position as close as possible to the roll of the rolling mill. However, the fixing position of the sensor 3 is limited by the roll diameter, the sensor shape, and the like.

As a result of the experiment by the present inventors, at a position separated from the roll of the finishing mill by 100 times the rolled material diameter, FIG.
As shown in the example, there is a relationship between the area reduction rate and the twist. That is, it has been found that at this position, if the area reduction rate is 12% or less, no twisting occurs. The sensor 3 is located at a position 100 times the diameter of the rolled material from the roll of the three-roll rolling mill,
Can be fully installed. Therefore, in the method of the present invention,
Preferably, the sensor 3 is fixedly arranged at a position within 100 times the rolled material diameter from the roll of the three-roll rolling mill. It should be noted that the limit of the area reduction rate at which no torsion occurs shifts to the high area reduction rate side when approaching the roll.

[0024]

According to the present invention, in measuring the right-angle cross-sectional profile of a rolled material rolled by a three-roll rolling mill, a sensor including a light emitter and a light receiver is fixed at an appropriate position according to the roll around the rolled material. Because it is arranged,
Simultaneous measurement is possible for the entire circumference of the rolled material. For this reason, in the conventional sensor rotation method, the problem of a measurement error due to a shift in the measurement timing of the entire circumference of the rolled material is solved. Further, since a mechanism for rotating the optical system as in the related art is not required, the device configuration can be simplified.

Therefore, in a hot rolling line of a metal material such as a bar or a steel wire, highly accurate in-line profile measurement and roll reduction adjustment based on the in-line profile can be realized. It is effectively solved and contributes to productivity improvement, high quality stability and yield improvement.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of the method of the present invention.

FIG. 2 is an explanatory view showing an example of arrangement of a rolling mill and a sensor in the method of the present invention.

FIG. 3 is a graph showing an example of torsion of a rolled material to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 3 roll rolling mill 2 ... Rolled material 3 ... Sensor 4, 5, 6 ... Roll 7 ... Roll axis 8 ... Arc 9 ... Relief surface 10 ... Beam 11, 12, 13, 14, 15, 16 ... Projector 17, 18 , 19,20,21,22 ... Receiver 23 ... Restricted part 24 ... Unrestricted part 25 ... Shadow

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mikio Kurachi 12 Nakamachi, Muroran, Hokkaido Nippon Steel Corporation Muroran Works (72) Inventor Tatsuya Sato 12 Nakamachi, Muroran, Hokkaido Nippon Steel Corporation Muroran F term in the steelworks (reference) 2F065 AA52 AA61 BB12 BB15 CC00 DD06 FF02 FF04 HH05 HH13 JJ02 JJ05 JJ09 JJ25 MM03 PP12 SS04 UU03

Claims (2)

[Claims] 1. A three-roll mill in which three roll axes intersect in a plane including a right-angle cross section of a rolled material to form an equilateral triangle, and a caliber shape of each roll is formed by an arc and a relief surface on both sides. On the side, a sensor by the projection beam method consisting of a pair of a projector and a light receiver that emits and receives a beam perpendicular to the rolled material axis within the same right-angle cross section of the rolled material, at circumferentially equal angular intervals around the rolled material axis At least six pairs are fixedly arranged, and three pairs are fixedly arranged with the beam directions parallel to the three roll axes, respectively, and simultaneously detect the position of the outer peripheral point of the rolled material by each sensor to obtain a right angle cross section of the rolled material. A method for measuring a profile of a three-roll rolled material, wherein a profile is obtained. 2. A reduction ratio of a rolled material in the three-roll rolling mill is set to 12% or less, and each of the sensors is fixedly arranged at a position within 100 times a rolled material diameter from the center of the three-roll rolling mill. The method for measuring the profile of a three-roll rolled material according to claim 1, characterized in that: