JP2001091226A - Dimension measuring method for shape steel while running - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dimension measuring method for shape steel, which can measure the section dimensions of a running shape steel with satisfactory accuracy using an inexpensive device. SOLUTION: Position relationship between a pair of laser range finders adapted to reciprocate and scan in the direction orthogonal to tracks for shape steel provided on the upper and lower sides of the running shape steel is set, so that the advancing directions of both range finders are the same, one advances behind the other by a designated distance, so that measuring timings of both range finders are made coincide with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the dimension of a section steel while traveling, and more particularly to a method for measuring the dimension of a section steel applied to advantageously automatically measure the leg length and center deviation of an H section steel. . In the present invention, a rangefinder is simply a laser rangefinder.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open Nos. 4-157304 and 5-5-
There is a method disclosed in Japanese Patent No. 93621. In these methods, as shown in FIG. 7, a pair of laser rangefinders A ₁ and A ₂ are arranged opposite to each other at a distance L _{C in} a direction sandwiching the flange width of the H-section steel 1 and a distance L to the flange is determined. _1, L ₂ were counted,
In addition, a pair of laser rangefinders B ₁ , B ₂
Are arranged opposite to each other at a distance L _C , and distances L ₃ and L ₄ to the web are measured. Then, the flange width W, the upper leg length b _T , the lower leg length b _B , the web thickness T _W , and the center deviation S are obtained by the following equations.

[0003] _{W = L C - (L 1} + L 2) (1) b T = L 3 -L 1 (2) b B = L 4 -L 2 (3) T W = L C - (L 3 + L 4 ) (4) S = (b T -b B) / 2 (5) showed only the left in FIG. 7, the distance meter is placed in the same relative positional relationship also right. Incidentally, the laser range finder usually used is a one-dimensional range finder, but in Japanese Patent Application Laid-Open No. 4-157304, there is a measurement error of the flange end face (the width of the end face is equal to the flange thickness) due to the lateral deflection of the running H-section steel. (A ₁ , A _{2 in} FIG. 7) sandwiching the flange width to avoid
Is a two-dimensional rangefinder having a wide measurable range.

Japanese Patent Application Laid-Open No. H10-115509 discloses an apparatus for measuring the dimension of a cross section of a running steel section, in which one laser distance meter is arranged above and below the section steel, and four laser distance meters are arranged on the left and right sides. It has been disclosed. On the other hand, Japanese Unexamined Patent Publication No.
The upper and lower halves of the stationary H-section steel are reciprocally scanned by a pair of laser rangefinders, and at this time, the turning angle of the rangefinder (the angle of the laser beam irradiation direction with respect to the rangefinder running direction) is changed between the forward and return passes. There is disclosed a method of combining upper and lower cross-sectional shape profiles based on a measured distance value and a turning angle, and calculating a cross-sectional dimension based on the result. The reference position coordinates of the upper and lower distance meters are calibrated by measuring a calibration piece having a known size and arrangement position at the same time as the measurement of the object to be measured, and using the results.

[0005]

The measuring methods disclosed in JP-A-4-157304, JP-A-5-93621, and JP-A-10-115509 measure distances with a plurality of distance meters fixed. Due to the fixed measurement method), the path line fluctuates on the DUT (the phenomenon that the DUT flutters up and down while traveling)
Is not affected by this, and is suitable for measuring an object to be measured during traveling. However, the stationary measurement method is expensive because the total number of required rangefinders is as large as 8 to 10 units, is expensive, has a great problem of error superimposition due to a characteristic characteristic difference (machine difference) between the meters, and has many locations. Heavy maintenance burden due to dispersion.

On the other hand, the measuring method disclosed in Japanese Patent Application Laid-Open No. 8-327329 is a method in which an object to be measured is scanned by moving a distance meter (referred to as a scanning measurement method).
It is inexpensive because a table is sufficient, and the problem of error superposition due to machine differences is small and the maintenance burden is light. However, this method is effective for measuring the dimensions of a stationary DUT because scanning is performed with the upper and lower rangefinders in the same running position. Error due to pass line fluctuation.

[0007] Scanning the running section in the width direction of the running track has the same result as scanning the section in a stationary state obliquely across the section, but the shape variation in the longitudinal direction of the section is small. The oblique transverse scanning itself does not cause a deterioration in measurement accuracy. That is, as shown in FIG. 8, if there is a pass line fluctuation of the fluctuation amount P in Δt seconds from when the upper and lower distance meters 2a and 2b scan the flange end surface to the time when the web surface is scanned, the upper and lower leg lengths and the center Measurement value of bias b _TP , b
_BP and _SP deviate from the correct values b _T , b _B and S obtained by _P when there is no pass line fluctuation by P.

As an example, an H-section steel (size 400 × 200; web height 400 mm, flange width) being transported on an actual production line
FIG. 9 shows the results of examining the degree of path line fluctuation by scanning and measuring the upper and lower surfaces of a 200 mm web) in the width direction of the conveyance path using a pair of upper and lower laser distance meters that are aligned with each other. Distance meter puts H-section steel on Op side (operating side of transport path)
During scanning from the scanning line to the Dr side (driving side of the conveyance path), the pass line fluctuation occurred about 40 times, and the maximum amount of the pass line fluctuation was about 3 mm.

Although the amount of the variation depends on the size of the shape steel, it is usually estimated to be several mm to 10 mm. Therefore, when the running shape steel is measured by a conventional scanning measurement method, the leg length and the center deviation are measured. The measurement accuracy is reduced by several mm to 10 mm. As described above, conventionally, it has been difficult to accurately measure the cross-sectional dimensions of a shaped steel piece while traveling with a pair of upper and lower distance meters.

An object of the present invention is to solve the above-mentioned problem and to provide a method for measuring the dimension of a shaped steel which can accurately measure the cross-sectional dimension of the shaped steel while traveling by using a pair of inexpensive upper and lower distance meters.

[0011]

According to the present invention, the positional relationship between a pair of laser rangefinders which reciprocally scan in a direction perpendicular to a running path of a shaped steel member provided above and below a running shaped steel member is determined. This is a method for measuring the dimension of a running steel bar, wherein one is set to travel a predetermined distance behind the other when the directions are the same, and the measurement timings of both are set to coincide.

[0012]

FIG. 1 is a sectional view showing an example of an embodiment of the present invention. FIG. 1 (a) shows upper and lower distance meters 2a, 2b.
Are in the forward direction (Op side → Dr side in this example), and (b) is the state in which the upper and lower distance meters 2a, 2b are both traveling in the backward direction (Dr side → Op side in this example). Are respectively shown.

In this state, according to the present invention, one of the rangefinders, for example, the upper rangefinder 2a is advanced from the other side, for example, by a predetermined shift amount η behind the lower rangefinder 2b. The shift amount η is, for example, a horizontal distance Z ₁ or more between an inner end W of one flange end surface and a web portion X closest to one flange side as shown in FIG. , web across X, the distance between Y (web in width) may be any Z ₂ or less.

[0014] eta ≧ Z ₁ becomes condition, one of the rangefinder can be regarded as the state in which the other simultaneously to scan the flange end face scans the web surface, it is necessary to determine the exact flange leg, eta ≦ Z ₂ These conditions are necessary for realizing a state in which both rangefinders scan the web surface and accurately determining the web thickness. However, in order to obtain the flange leg length more accurately, it is necessary to scan the flange end face at a plurality of points (for example, as shown in FIG.
2 or the like using the locations of the data) are preferred in the center, and at the same time one of the rangefinder from this point to scan all parts flange end face, eta so the other to achieve a state of scanning the web plane is Z ₃ or more Is preferred. Further, when the web in the width Z ₂ is greater than times that of the Z _3, as shown in FIG. 4, and eta ≦ Z _2/2, respectively at left and right halves of the H-shaped steel, each measurement If it is determined, more accurate measurement can be performed.

In the example of FIG. 1, the upper distance meter is set to the rear (the lower distance meter is set to the front), but the order of the upper and lower distance meters may be reversed. Further, in the present invention, the measurement timings of the upper and lower distance meters 2a and 2b are matched. This measure is necessary in order to prevent the fluctuation amount of the path line fluctuation generated during the deviation between the measurement timings in the vertical direction from rising as an error.

Thus, by processing the measured distance data by, for example, a method described below with reference to FIG. 4, it is possible to derive the sectional dimensions of the section steel without being affected by path line fluctuations. Become like FIG. 4 is a sectional view showing the transition of the simultaneous upper and lower measurement state according to the present invention. The distance meter is in the state of (a) ⇒ (b) ⇒ (c) on the outward trip, and (d) on the return trip
The state of (e) ⇒ (f) is sequentially passed.

The lower distance meter 2 is used for both forward and return trips.
Since b travels ahead of the upper distance meter 2a by a shift amount η, on the outward path, the upper end face of the flange and the lower face of the web are simultaneously measured on the Op side to obtain distance values L _T1 and L _B1 (a). Then, the upper and lower surfaces of the web are simultaneously measured on the web Op side and the Dr side, respectively, and the distance values L _T2 , L _B2 , L _T2 ′, L
_B2 'is obtained (b), and the upper surface of the web and the lower end surface of the flange are simultaneously measured on the Dr side to obtain distance values _LT3 and _LB3 (c). Then, on the return path, first, the upper end face of the flange and the lower face of the web are simultaneously measured on the Dr side to obtain distance values _LT4 and _LB4 (d), and then the upper and lower faces of the web are simultaneously measured on the Dr and Op sides of the web. And the distance values L _T5 , L _B5 ,
L _T5 ′ and L _B5 ′ are obtained (e), and the upper surface of the web and the lower end surface of the flange are simultaneously measured on the Op side to obtain distance values L _T6 and L _T6 .
_B6 is obtained (f).

Then, using the distance values obtained in the forward and return _trips , the following formulas are used to obtain the Op-side web thickness T _WOP , the Dr-side web thickness T _WDR , the Op-side upper leg length b _OPT , the Dr-side lower leg length b _DRB , and the Dr-side upper leg length. b _DRT , Op side lower leg length b _OPB , Op side flange width W _OP , Dr side flange width W _DR , Op side center deviation S _OP , Dr side center deviation S _DR are calculated. _{T WOP = L C - (L} T2 + L B2 + L T5 '+ L B5') / 2 (6) T WDR = L C - (L T5 + L B5 + L T2 '+ L B2') / 2 (7) b OPT = { L _C − (L _T1 + L _B1 )｝ − ｛L _C − (L _T2 + L _B2 )｝ (8) b _DRB = ｛L _C − (L _T3 + L _B3 )｝ − ｛L _C − (L _T2 '+ L _{B2 ')} (9) b DRT} = {L C - (L T4 + L B4)} - {L C - (L T5 + L B5)} (10) b OPB = {L C - (L T6 + L B6)} - _{{L C - (L T5 '} + L B5')} (11) W OP = b OPT + T WOP + b OPB (12) W DR = b DRT + T WDR + b DRB (13) S OP = (b OPT -b OPB) / 2 (14) S _DR = (b _DRT −b _DRB ) / 2 (15) In calculating the leg length by the equations (8) to (11), only the distance data measured simultaneously is used. There is no room for errors due to path line fluctuations in the leg length and center deviation measurement results. Therefore, according to the present invention, high-precision measurement of the cross-sectional dimension of the running section steel is possible.

In obtaining the web thickness in the states shown in FIGS. 4 (b) and 4 (e), upper and lower simultaneous measurements may be taken at a plurality of points in time and averaged. Although the embodiment in which the object to be measured is an H-section steel has been described here, the present invention is not limited to this. Shaped steel may be used.

[0020]

[Example] Intermediate rolling mill at H-section steel hot rolling line
Of the H-section steel traveling on the conveyance path from the side to the entrance of the finishing mill
An example in which the present invention is applied to measurement of a cross-sectional dimension will be described.
You. The rangefinder support mechanism used in this embodiment is shown in FIG.
On the transport path 3 with side guides 9 on both sides
, A pair of upper and lower rails 4 are supported by supporting columns 5 in the conveying path width direction
And the laser distance meter 2 is mounted on each rail 4
Standby position P one by one ₀And return position P₁Round trip between
It is mounted so that it can run, and one end of each rail 4 has a distance meter 2
Driving device 6 for driving the vehicle, and a driving circuit of the driving device 6
Measure the number of turns and convert the result to the travel position of the distance meter 2
And a position detector 7 which is arranged. In addition, distance meter 2
Was fixed at 90 °.

The calibration piece 8 having a known size, which is arranged at a predetermined position between the standby position P ₀ and the transport path 3, is scanned every time the H-section 1 is measured, and the calibration piece distance data is used. The reference position coordinates of the distance meter 2 were calibrated. With this device, the length of the upper and lower legs and the center deviation of the Op and Dr sides of the 20 H-beams running under the variation of the pass line of about 5 mm are automatically measured by the method described with reference to FIG. Examined. In H-shaped steel subjected to the measurement, Z ₁ as defined in Figure 2 is 35 mm, Z
₃ 50 mm, since Z ₂ was 370 mm, was set up and down distance meter shift amount η (bottom first) position to 50 mm.

The results are summarized in FIG. The measurement error was obtained by subtracting the result of manual measurement (which is regarded as the most probable value) from the result of automatic measurement. As shown in FIG. 6, the measurement error was within ± 0.3 mm at any of the measurement sites. This measurement error range is significantly reduced from about ± 5 mm to ± 0.3 mm in comparison with the conventional method in which the shift amount η is set to 0. According to the present invention, the sectional dimension of the running section steel by the scanning measurement method is measured. It was confirmed that the measurement accuracy was significantly improved.

[0023]

As described above, according to the present invention, an excellent effect can be obtained in that an inexpensive apparatus using a pair of upper and lower distance meters can be used to measure the cross-sectional dimension of a running steel section with high accuracy.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an embodiment of the present invention.

FIG. 2 is a diagram for explaining a shift amount.

FIG. 3 is a diagram showing a state in which a flange end face is scanned at a plurality of points.

FIG. 4 is a cross-sectional view showing a transition of a simultaneous upper and lower measurement state according to the present invention.

FIG. 5 is a sectional view showing a distance meter support mechanism used in the embodiment.

FIG. 6 is a graph showing a measurement error investigation result of the example.

FIG. 7 is a sectional view showing a stationary measurement method.

FIG. 8 is a cross-sectional view showing a principle of generation of a measurement error due to a pass line fluctuation in a conventional scanning measurement method.

FIG. 9 shows the results of a pass line fluctuation survey on an actual production line.
It is a graph showing an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 H-shaped steel 2 Distance meter (laser distance meter, a: upper, b: lower) 3 Transport path 4 Rail (a: upper, b: lower) 5 Prop 6 Drive 7 Position detector 8 Calibration piece 9 Side guide 10 Laser beam irradiation direction (a: upper, b: lower)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F065 AA52 BB15 CC07 DD14 FF11 FF44 GG06 HH04 JJ05 JJ16 MM03 MM07 PP22 QQ42 UU06

Claims (1)

[Claims] 1. A positional relationship between a pair of laser rangefinders which reciprocally scan in a direction perpendicular to a running path of a shaped steel member provided above and below a running shaped steel member, wherein when both traveling directions are the same, one is the other. A method for measuring the dimensions of a running steel section, wherein the measuring section is set so as to travel backward by a predetermined distance from the vehicle, and the measurement timings of the two sections are matched.