JP2556945B2 - Thickness measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thickness measuring device for measuring the thickness of steel materials such as shaped steel.

[0002]

2. Description of the Related Art In a thickness measuring device of this type, it is general to obtain the true thickness of a steel material by making a correction in consideration of flange collapse of the steel material.

That is, as shown in FIG. 5, the steel material 200 is not perpendicular to the measuring axis m of the sensor of the apparatus, and the inclination angle θ of the steel material 200 with respect to the measuring axis m due to the fall of the flange or the like.
If it is tilted at, the measured thickness by the sensor t
_s does not match the true thickness t of the steel material 200.

The relationship between the measured value t _s and the true thickness t in this case is expressed by the equation

[Equation 1] Is represented by

Therefore, for example, when the inclination angle θ is 5 ° and the true thickness t is 10 mm, the measured value t
_{Since s} becomes 10.038 mm, an error of 38 μm will occur in the measurement. This error is particularly remarkable when the thickness of the steel material 200 is large.

Therefore, it is necessary to correct the measured value t _s and the true thickness t by making a correction corresponding to the inclination angle θ of the steel material 200.

Conventionally, as a thickness measuring device of this type, there is a device described in Japanese Utility Model Laid-Open No. 61-139411, which was invented by the present inventor.

This thickness measuring device has two parts in a C-shaped frame.
The one-dimensional laser rangefinders of the stand are arranged so as to face each other, and the flange portion of the steel material is positioned between these laser rangefinders. Corresponding to the inclination angle of the flange portion C
By correcting the tilt of the entire mold frame, the optical axis (measurement axis) between the laser rangefinders is perpendicular to the flange.

Further, as described in JP-A-56-135106 and JP-A-58-24806, there is also invented a thickness measuring device for measuring the inclination angle of a steel material and correcting the thickness measurement value. .

These thickness measuring devices measure the apparent thickness of the steel material with a thickness gauge using radiation, and measure the inclination angle of the steel material by means of measuring the inclination angle to measure the apparent thickness. The true thickness of the steel material is calculated from the value and the measured inclination angle.

[0011]

However, the thickness measuring device described in Japanese Utility Model Laid-Open No. 61-139411 described above has a structure in which the C-shaped frame is mechanically tilted for correction, so that the correction accuracy is improved. Is low and the reliability of measurement accuracy is low. Further, since a mechanism for tilting the C-shaped frame according to the shape of the flange portion of the steel material is required, there is a drawback that the structure of the device becomes complicated.

On the other hand, in the thickness measuring devices described in JP-A-56-135106 and JP-A-58-24806, since radiation is used, the influence of radiation exposure on the human body poses a problem. Furthermore, these devices are based on the assumption that the steel material is accurately positioned at the preset measuring point and have a uniform inclination angle, so that the steel material may not be accurately positioned at the measuring point, or If there is a large inclination angle, there is a drawback that the measurement accuracy becomes poor. In particular,
The H-section steel during hot rolling rarely passes through the preset measurement points, and the inclination angles and lengths of the four flange portions on the top, bottom, left, and right are also different from each other, and thus are uneven.
Accurate measurement cannot be performed with the thickness measuring device described above.

The present invention has been made to solve the above-mentioned conventional problems, and provides a thickness measuring device capable of highly accurately measuring the thickness of shaped steels of various shapes with a simple structure. To aim.

[0014]

In order to achieve the above object, the present invention provides a first distance measuring means capable of measuring a plurality of distances to one surface of an object to be measured, and an object to be measured. And a second distance measuring means which is arranged so as to face the first distance measuring means and which can measure the distance to the other surface of the object to be measured. It is characterized in that the apparent thickness of the measured object obtained by the second distance measuring means is corrected by the tilt angle of the measured object obtained by the first distance measuring means.

[0015]

According to the present invention, by the first distance measuring means,
Since a plurality of distances to one surface of the measured object can be measured, the tilt angle of the measured object can be obtained from these distances.

At this time, if a plurality of distances are measured, for example, according to the shape of the widthwise end of the shape steel, accurate inclination angle measurement can be performed for the shape steel having various widthwise ends. It can be performed.

Then, the first and second distance measuring means measure the distance between the front surface and the back surface of the object to be measured to obtain the apparent thickness of the object to be measured. First
The true thickness of the object to be measured can be measured with high accuracy by correcting the inclination angle obtained by the distance measuring means.

[0018]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows the construction of a thickness measuring apparatus according to an embodiment of the present invention.

Reference numeral 1 denotes a C-shaped frame provided on a pedestal 2. Inside the C-shaped frame 1, a two-dimensional laser distance meter 3 and a one-dimensional laser distance meter 4 have their optical axes aligned. And are arranged opposite to each other.

The opening size of this C-shaped frame 1 is H-shaped steel 1.
00 measurement range. Further, left and right guide guides (not shown) are provided before and after the laser distance meters 3 and 4 so that the flange portion 101 of the H-shaped steel 100 does not interfere with the two-dimensional laser distance meter 3 and the one-dimensional laser distance meter 4. .

The two-dimensional laser range finder 3 includes a flange portion 1 of an H-shaped steel 100 that passes over a roller table (not shown).
It is an electronic scanning type laser rangefinder for measuring the distance to 01.

Specifically, the two-dimensional laser rangefinder 3 is
As shown in FIG. 2, laser light is vertically irradiated to the front surface of the flange portion 101 to coordinate the optical axis point O, arbitrary points P and Q (x ₀ , y ₀ ), (x ₁ , y ₁ ) and (
x ₂ , y ₂ ) can be measured, and its coordinate signal O (
x ₀ , y ₀ ), P (x ₁ , y ₁ ) and Q (x ₂ , y ₂ ) are output to the calculation unit 5.

On the other hand, the one-dimensional laser range finder 4 irradiates the back surface of the flange portion 101 with laser light to measure the coordinates (x ₀ ′, y ₀ ′) of the optical axis point O ′ and obtain the coordinate signal O. ′
It outputs (x ₀ ′, y ₀ ′) to the calculation unit 5.

The calculation unit 5 inputs the two coordinate signals output from the two-dimensional laser range finder 3 to obtain an equation

[Equation 2] Is calculated. Here, θ is the inclination angle of the flange portion 101.

The arithmetic unit 5 is also a one-dimensional laser rangefinder 4
Based on the coordinate signal O ′ (x ₀ ′, y ₀ ′) from the two-dimensional laser rangefinder 3 and the coordinate signal O (x ₀ , y ₀ ) from the two-dimensional laser range finder 3

(Equation 3) Is calculated, and the apparent thickness t _s and the inclination angle θ of the above equation (2) are calculated.
From the above equation

[Equation 4] Is calculated to calculate the true thickness t 1 of the flange portion 101. Here, l is the distance between the two-dimensional laser range finder 3 and the one-dimensional laser range finder 4.

A thickness meter 6 is provided at the subsequent stage of the arithmetic unit 5.
Is provided, and the inclination angle θ calculated by the calculator 5 and the true thickness t are displayed by the thickness meter 6.

Reference numeral 7 denotes a moving motor for moving the C-shaped frame 1 to the left and right through the C-shaped frame moving screw 8, and by controlling the rotation of the moving motor 7, the H-shaped steel 100 is moved. The lateral positional relationship between the flange portion 101 and the one-dimensional and two-dimensional laser rangefinders 4 and 3 can be determined. The positional relationship is set with high accuracy by a positioner (not shown).

Therefore, if the measurement point of the thickness of the flange portion 101 and the like are known in advance, an upper CPU (not shown)
Since the up, down, left and right positions of the C-shaped frame 1 are calculated and set by the above, if the moving motor 7 is controlled based on this set value, the one-dimensional and two-dimensional laser rangefinders 4 and 3 can be obtained.
Can be positioned.

Reference numeral 9 denotes a lifting motor for vertically moving the pedestal 2 via the pedestal lifting jack 10. By controlling the rotation direction of the lifting motor 9, the vertical positioning of the C-shaped frame 1 is performed. It can be performed.

Although only the measuring means of the left flange portion 101 of the H-section steel 100 is shown in FIG. 1, a measuring means having the same structure as the illustrated measuring means is provided on the right side of the drawing and is not shown. It is also possible to measure the thickness of the right side flange portion of the.

Next, the operation of this embodiment will be described.

Lower flange portion 101a of the flange portion 101
When the thickness of the H-shaped steel 100 passing on the roller table (not shown) is displaced from the measurement point, the moving motor 7 moves the C-shaped frame 1 to the left and right, The one-dimensional and two-dimensional laser rangefinders 4 and 3 are positioned with respect to the lower flange portion 101a.

In this state, as shown in FIG. 2, the two-dimensional laser range finder 3 first measures the coordinates of the closest point P and the farthest point Q of the lower flange portion 101a.

These coordinate signals P (x ₁ , y ₁ ) and Q
(X ₂ , y ₂ ) is input to the calculation unit 5, and in the calculation unit 5, the coordinate values x ₁ , y ₁ , x ₂ , y _{2 of} these coordinate signals are input.
Equation (2) is calculated based on
The inclination angle θ of a is obtained.

Subsequently, the coordinates of the optical axis points O and O'of the lower flange portion 101a are measured by the two-dimensional laser distance meter 3 and the one-dimensional laser distance meter 4.

These coordinate signals O (x ₀ , y ₀ ), O ′
(X ₀ ′, y ₀ ′) is input to the calculation unit 5, and the calculation unit 5 calculates the formula (3) based on the coordinate values x ₀ and x ₀ ′ to obtain the apparent thickness t _s. .

Then, the inclination angle θ and the apparent thickness
Formula (1) is calculated from t _s and the lower flange portion 101a
The true thickness t of the lower flange portion 101a and the inclination angle θ are displayed on the thickness gauge 6.

The upper flange portion 10 of the flange portion 101
When measuring the inclination angle θ of 1b, the C-shaped frame 1 is moved by the moving motor 7 and the lifting motor 9,
As shown in FIG. 3, the optical axis of the two-dimensional laser range finder 3 is substantially aligned with the position of the web 102.

Then, as shown in FIG. 3, the optical axis point O of the upper flange portion 101b is measured by the two-dimensional laser distance meter 3.
The coordinates of (the closest point) and the closest point P are measured.

These coordinate signals O (x ₀ , y ₀ ), P
(X ₁ , y ₁ ) is input to the calculation unit 5, the calculation unit 5 calculates the equation (2), and the inclination angle θ of the upper flange portion 101 b is displayed on the thickness meter 6.

Further, the thickness of the right flange portion of the H-section steel 100 is similarly measured by the above-mentioned measuring means (not shown).

As described above, according to the thickness measuring apparatus of this embodiment, the inclination angles of the upper, lower, left and right flanges of the H-section steel 100 can be measured independently, so that as shown in FIG. An abnormally shaped H-section steel 100 with poor squareness ((a) and (b) in Fig. 4) and flange warp ((c) and (d) in Fig. 4)
Even in this case, the thickness of each flange portion can be measured with high accuracy.

As a result, the profile of the H-section steel 100 can be sampled, the dimension of the defective shape can be grasped, and the acceptance / rejection of the product can be promptly and accurately determined.

Further, since it is not necessary to set the angle of the C-shaped frame 1 according to the shape of the H-shaped steel 100, the structure of the entire apparatus is simplified.

Further, even if the H-section steel 100 is deviated from the measurement point, the measurement can be performed accurately, so that the degree of freedom of measurement is high.

In this embodiment, the two-dimensional laser range finder 3 and the one-dimensional laser range finder 4 are arranged at the left end and the right end of the C-shaped frame 1, but conversely they are arranged at the right end and the left end. It is clear that the same effect is obtained.

Further, in this embodiment, the thickness is measured by the combination of the one-dimensional laser range finder 4 and the two-dimensional laser range finder 3, but the present invention is not limited to this, and the two-dimensional laser range finder 3 is used. Replaced by two 1-dimensional laser rangefinders, 2
Of course, the same function as the three-dimensional laser range finder 3 can be provided.

Further, although the H-section steel has been described in the present embodiment, it is needless to say that the same thickness measurement can be performed for the section steel such as the U-section steel.

[0050]

As described above, according to the thickness measuring apparatus of the present invention, it is possible to measure the thickness of shaped steels of various shapes with high precision by a simple structure, and at the same time, the shaped steels can be used. There is an excellent effect that the thickness of the shaped steel can be accurately measured even when is deviated from the measurement point.

[Brief description of drawings]

FIG. 1 is a schematic view showing a thickness measurement apparatus according to an embodiment of the present invention with a part of the configuration omitted.

FIG. 2 is a schematic explanatory diagram illustrating a measuring method when measuring an inclination angle of a lower flange portion.

FIG. 3 is a schematic explanatory diagram illustrating a measuring method when measuring an inclination angle of an upper flange portion.

FIG. 4 is a view showing an H-shaped steel having an abnormal shape, and FIG.
4 (a) and 4 (b) are H-section steels with poor squareness, and FIGS. 4 (c) and 4 (d) are H-section steels with flange warpage.

FIG. 5 is a schematic explanatory view for explaining the relationship between the true thickness of steel material and the apparent thickness and inclination angle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... C-type frame, 2 ... Frame, 3 ... Two-dimensional laser range finder (first distance measuring means), 4 ... One-dimensional laser range finder (second distance measuring means), 5 ... Calculation part, 6 ... Thickness Total: 7 ... Moving motor, 8 ... C type frame moving screw, 9 ... Lifting motor, 10 ... Stand lifting jack, 100 ... H-shaped steel (shaped steel), 101 ... Flange portion (width direction end portion), 101a ... lower flange portion, 101b ... upper flange portion, 102 ... web.

Claims (1)

(57) [Claims] 1. A first distance measuring means capable of measuring a plurality of distances to one surface of an object to be measured, and a first distance measuring means arranged so as to face the first distance measuring means with the object to be measured interposed therebetween. And a second distance measuring means that is capable of measuring the distance to the other surface of the measured object, and the apparent thickness of the measured object obtained by the first and second distance measuring means. The thickness measuring device is characterized in that the thickness is corrected by an inclination angle of the object to be measured which is obtained by the first distance measuring means.