JPH03110409A - Method and device for measuring width of ultrasonic range finder system h-type material flange - Google Patents

Abstract

PURPOSE:To accurately find the flange width by investigating measurement errors due to a lateral shake previously in flange thickness units, finding a measurement error due to the lateral shake, and correcting the flange width measured by an ultrasonic range finder with a correction quantity based upon the error. CONSTITUTION:When the flange width B (left flange in figure) of H-type steel 14 is measured, distances l1 and l2 to both end surfaces 13 of the flange are detected by ultrasonic range finders 12A and 12B and distances l3 and l4 to flange flanks are detected by range finders 16A and 16B for flange position measurement at the same time. Deviation correction value computing elements 20A and 20B are stored with measurement errors for a deviation quantity in flange units previously and find correction values. Then a flange width computing element 22 calculates the flange width B from the correction values and the distances l1 and l2 which are detected by the range finders 12A and 12B.

Description

[Detailed description of the invention] [Industrial application field]

The present invention is a method using an ultrasonic distance meter that is suitable for non-contact measurement of the flange width of H-beam steel at room temperature while driving.
The present invention relates to a method and device for measuring the width of a profile flange.

[Conventional technology]

BACKGROUND ART Conventionally, as a technique for measuring the flange width of an H-shaped member, for example, an H-shaped steel, there is a so-called backlight method as described in, for example, the literature "Tetsu to Hagane", Vol. 70, No. 015. In this backlighting method, as shown in FIG. The camera 2 receives light (parallel light) from the flange, detects the edge position of the flange, and measures the flange width. There is also a light cutting method disclosed in Japanese Patent Application Laid-Open No. 57-144404. In this photosection method, as shown in FIG.
Slit light (band-shaped light flux) on both sides of the H-type steel flange 10
3.4 is projected and the reflected light is imaged with camera 5.6,
The flange width is measured by analyzing the captured image.

[Problem to be solved by the invention]

However, the conventional flange width measurement technique has the following problems. In the backlight method, the slanted structure that requires a camera with a floodlight and a linear image sensor is complicated and expensive, and the H-shaped material has small dimensions (for example, flange width x web height = 50 x 100v).
In the case of (approximately i), there is a risk that the projector and the H-shaped material to be measured may come into contact with each other, causing a practical problem. In addition, the light cutting method requires a light source that projects a slit light and a camera, making the device configuration large and expensive, and in order to ensure high-precision measurement,
It is necessary to reduce the angle of incidence of the slit light, but if the angle of incidence is reduced, the measurement results will be strongly influenced by the bending, and there is a risk that accuracy will deteriorate. Moreover, since the device configuration becomes large, installation work, especially foundation work on the lower surface side, becomes large-scale work. The present invention has been made in view of the above-mentioned conventional problems, and
It is an object of the present invention to provide a method and device for measuring the flange width of an H-shaped material that can accurately measure the flange width of the H-shaped material in a non-contact manner while traveling at low cost and with a small device configuration.

[Means to achieve the task]

The present invention detects the distance to the flange end face with an ultrasonic distance meter installed opposite both end faces of the flange of an H-shaped member,
Determining the flange width from the detection distance, detecting the displacement of the flange in a direction perpendicular to its side surface, and calculating the amount of deviation of the flange with respect to the center line of the ultrasonic distance meter based on the detected displacement and flange thickness, The above-mentioned problem was achieved by determining the correction amount of the flange width from the calculated leakage amount based on the relationship between the predetermined deviation amount and the flange width measurement error, and correcting the determined flange width with the correction amount. It is something. The present invention also provides an ultrasonic distance meter for detecting the distance to the flange end face, which is provided facing both end faces of the flange of the H-shaped member, a means for determining the flange width from the detected distance, and an ultrasonic distance meter for detecting the distance to the flange end face, and a , means for detecting displacement in a direction perpendicular to the side surface thereof, means for calculating the amount of deviation of the flange with respect to the center line of the ultrasonic range finder based on the detected displacement and the flange thickness, means for storing the relationship between the calculated deviation amount and the flange width measurement error as a table; means for calculating the correction amount of the flange width based on the table from the calculated deviation amount; The above object has been achieved by providing means for correcting the corrected flange width and means for displaying the corrected flange width.

[Effect]

The inventor conducted various studies in order to make it possible to measure the flange width of an H-shaped member using a measuring device that is simpler, smaller, and less expensive than the conventional technology. As a result, in order to configure the device at low cost, it is sufficient to use an inexpensive sensor, so do not consider using an ultrasonic distance meter. Distance meters are provided facing the surface at predetermined intervals, and the flange width is calculated by subtracting the detection values of both distance meters from the distance. However, when trying to measure the flange width with an ultrasonic distance meter, it is necessary to measure the distance to both end surfaces of the flange with the distance meter, but the width of the flange end surface is narrow (in the case of the example, the minimum flange thickness As a result, the ultrasonic reflecting surface becomes small, and furthermore, the H-shaped material during transportation causes lateral vibration (also referred to as meandering), so detection accuracy cannot be guaranteed. Therefore, when we investigated the influence of lateral vibration on the measurement values of ultrasonic rangefinders, we found that there is a certain relationship between the amount of lateral vibration and measurement error. An example of the survey results is shown in Fig. 1. In this case, the amount of deviation (lateral runout ff1) C is:
As shown in FIG. 1, the distance from the distance meter 12 to be detected to the end face of the flange 10 is 1601HI, which refers to the amount of deviation of the flange 10 with respect to the center line of the ultrasonic distance meter 12. The thickness is 6.1aII and 1
711 H-type steel was measured. From the results shown in Figure 1, it was found that if the geometric positional relationship of the flange end face with respect to the ultrasonic rangefinder, that is, the amount of deflection of the flange from the center of the rangefinder, is known, the measurement error due to Ta runout can be determined. . Therefore, measurement errors due to this lateral runout are investigated in advance for each flange thickness and compiled into a table, for example. Online, by measuring the lateral runout, calculating the measurement error due to the lateral runout using the table, and correcting the flange width measured by the ultrasonic distance meter using the correction amount for the measurement error, the flange width can be determined with high accuracy. be able to. The present invention was created based on the above findings. According to the present invention, since an inexpensive ultrasonic distance meter is used and no light source is required, the entire device configuration can be downsized and no construction work is required. Since there is no need to insert it, there is no risk of contact between the light source and the H-shaped material, and since measurement errors due to lateral vibration are reduced, the flange width of the H-shaped material while it is traveling can be measured accurately without contact.

【Example】

Embodiments of the present invention will be described in detail below with reference to the drawings. This embodiment is a flange width measuring device for measuring the widths B1 and B2 of a flange 10 of an H-shaped steel 14 as shown in FIG. The H-shaped steel 14 to be measured has a flange whose thickness is tfj to tf. In FIG. The configuration of the flange width measuring device is shown in FIG. 3. As shown in Fig. 3, this flange width measuring device has H
The flange work 0 of the mold 1114 is provided above and below facing both end faces, and the distance to each flange end face is llI!
Ultrasonic distance meter 12A, 1 for detecting J21.12
2B, and a flange position measuring distance meter provided perpendicularly to the flange 10 and comprising an ultrasonic distance meter for detecting the positions of the upper side surface and lower side surface of the flange 10 from the distance HJ23, A< to those surfaces. 16A, 16B, and the detected distance [3, i4 to flange deviation amount (lateral runout amount) C
+, bias amount calculators 18A and 18B for calculating C2
and the calculated deviation amount c,,c2, the correction value E when calculating the flange width using a preset table.
+, bias correction value calculator 2OA for calculating E2
, 20B, the detection distance and the correction values E t , E z
Flange width calculator 2 for calculating flange @B from
2, a flange thickness setter 24 for setting the flange thickness in the bias amount calculators 18A and 18B, and a display section 26 for displaying the calculated flange width. Although Fig. 3 only shows the configuration of the device for measuring the flange width B1 on the left side in Fig. 3 of H-type fI414, the device configuration for measuring the flange width B2 on the right side is also similar. Therefore, illustration and explanation of its configuration will be omitted. In addition, a flange width measuring device for only one side is provided, and one flange width B1 is measured, and then the H type g4
14 by changing the position of the other flange I using the same device.
! B2 can also be measured. Next, the operation of the embodiment will be explained. The flange width measuring device shown in FIG.
When measuring, first use the ultrasonic distance meter 12A, 12
At B, the distances 1 and λ2 to both end faces 13 of the flange are detected. On the other hand, distance meters 16A and 16B for measuring the flange position
The distance to the side of the flange is RtJ! , 3. Detect fl* simultaneously and know the position of the flange side surface. Bias amount calculator 18
A and 18B calculate the leakage amount of the flange 1o from the detected pressures Ni13 and J2s as follows. In this case, the flange thickness t set in advance in the flange thickness setting device 24
f is input to each arithmetic unit 18A, 18B. The distance calculation units 18A and 18B calculate the input detection pressure ui, 3, J! From s and the set flange thickness tf,
The deviations ff1c+ and C2 of the upper and lower parts of the flange 10 are determined by the following equations (1) and (2). C+=Loa-Js-(tf/2)"(1)C2=LO
4-, +24 (tf/2)...<2) However, L
O3 is the distance meter 16A and the ultrasonic distance meter 12A.
The distance between the center line (C+=O line) and Log is the distance between the center line (C2=O line) of the Noh rangefinder 16B and the Noh ultrasonic range finder 12B. The bias correction value calculators 20A and 20B have the aforementioned first
As shown in the figure, measurement errors with respect to deviation amounts are stored as a table for each flange thickness. Therefore, the offset correction value calculators 2OA and 20B calculate correction values E+ and Ez from the deviation amounts Ct and C2 calculated in the above (1) and (2) using the table. Next, the flange width calculator 22 uses the correction values El, E2 obtained as described above and the ultrasonic distance meters 12A, 1.
The flange width B is calculated using the following equation (3) from the distance β1.12 to the flange end face detected at 2B. B=Lo+-(i++E+)-<Jz+Ez)...
(3) However, L and o+ are the distances between the respective ultrasonic distance meters 12A and 12B. The calculated flange width B is displayed on the display section 26 and used as data for quality control of the H-shaped steel. In this embodiment, since an inexpensive ultrasonic range finder is used as the range finder for flange position measurement, the apparatus can be constructed at low cost. However, when implementing the present invention, the distance meter for flange position measurement is not limited to using such an ultrasonic distance meter,
Any other type of distance meter, such as a laser distance meter, that can detect the distance to the side surface of the flange without contact can also be used. In addition, in the above embodiment, H-shaped steel was used as an example of the H-shaped material, but
The H-shaped material whose flange width can be detected in the present invention is not limited to H-shaped steel.

【Effect of the invention】

As explained above, according to the present invention, the excellent effect of being able to accurately measure the flange width of an H-shaped member in a non-contact manner with an inexpensive and compact device configuration can be obtained. In addition, since an ultrasonic distance meter is used, the distance from the end face of the flange to be measured can be large (approximately 200 nIl), so the possibility of the distance meter coming into contact with the object to be measured is extremely small, and safety is high. Since the measurement period can be shortened to 513 CIC (approximately 115 CIC of conventional optical cutting method), 411/5
Measurement can be performed without any problem even during running of 13C. Therefore, it can be said that the present invention is extremely useful.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of error with respect to the amount of clearance for explaining the present invention in detail. FIG. 2 is a diagram showing an H-shaped steel to be measured by a flange measuring device according to an embodiment of the present invention. 3 is a block diagram including a partial view showing the overall configuration of the device according to the embodiment; FIG. 4 is a sectional view showing the configuration of a conventional flange width measuring device using a backlight method; Similarly, FIG. 5 is a perspective view showing the configuration of an apparatus for the optical cutting method. 10...Flange, 12.12A, 12B...Ultrasonic distance meter, 13...
Flange end face, 14... H-shaped steel, 16A, 16B... Distance meter for flange position measurement, 1
8A, 18B... Bias 1 calculator, 2OA, 20B... Deviation correction value calculator, 22... Flange width calculator, 24... Flange thickness setter, 26... Display unit.

Claims (2)

[Claims] (1) An ultrasonic distance meter installed opposite both end faces of the flange of the H-shaped material detects the distance to the flange end face, calculates the flange width from the detected distance, and measures the distance in the direction perpendicular to the side surface of the flange. Detect the displacement of the flange, calculate the amount of deviation of the flange with respect to the center line of the ultrasonic distance meter based on the detected displacement and flange thickness, and calculate the relationship between the predetermined deviation amount and the flange width measurement error from the calculated deviation amount. A method for measuring the flange width of an H-shaped material using an ultrasonic distance meter, characterized in that the amount of correction of the flange width is determined based on the amount of correction, and the determined flange width is corrected using the amount of correction. (2) Provided opposite to both end faces of the flange of the H-shaped member,
an ultrasonic distance meter for detecting the distance to the flange end face; a means for determining the flange width from the detection distance; a means for detecting displacement of the flange in a direction perpendicular to its side surface; means for calculating the amount of deviation of the flange with respect to the center line of the ultrasonic distance meter based on the displacement and flange thickness; and means for storing the relationship between the predetermined deviation amount and the flange width measurement error as a table. and means for determining a correction amount for the flange width based on the table from the calculated deviation amount; means for correcting the determined flange width using the correction amount; and displaying the corrected flange width. 1. An ultrasonic distance meter type H-shaped material flange width measuring device characterized by comprising means for measuring the width of an H-shaped material.