JPH05346313A - Cross-sectional-shape measuring method - Google Patents

Abstract

PURPOSE:To measure the cross-sectional shape of the specified part of a long material, which is moved in the longitudinal direction, accurately. CONSTITUTION:Slit light beams are projected from slit-light projecting devices 6A, 6B and 6C on the outer surfaces of the specified parts of a long material from the surrounding side of the long material 1. The reflected light beams are detected as profile parts A, B and C of the long material 1. The profile parts A, B and C are synthesized, and the cross-sectional shape at the part is measured.

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 sectional shape of a rolled steel rod, for example.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, in order to measure the cross-sectional shape of a rod-shaped steel material (1) that moves in the longitudinal direction, a lamp (2) and a projection lens ( 3), a light receiving lens (4), and a CCD sensor (5) are placed in the cross-section shape measuring device, and the device is rotated in the direction of the arrow, and the lamp (2) is placed at the focal point of the light projecting lens (3). From the floodlight lens
It is projected onto the light receiving lens (4) side as a parallel light flux via (3), and the rod-shaped steel material (1) is projected onto a CCD sensor (5) arranged behind the focal point of the light receiving lens (4) to project the light. Point distance l
Was measured, and the cross-sectional shape of the rod-shaped steel material (1) was measured by synthesizing the measured values over the entire circumference.

[0003]

However, even while the above device makes one revolution around the rod-shaped steel (1), the rod-shaped steel (1)
Since it is moving in the longitudinal direction, it was impossible to accurately measure the cross-sectional shape of a specific portion of the rod-shaped steel material (1).

[0004]

Means for Solving the Problems The present invention is, as a means for solving the above-mentioned conventional problems, at the time of measuring the cross-sectional shape of a long material (1) which moves in the longitudinal direction, the long material at a predetermined position. A specified number of slit light projection devices around (1)
(6A, 6B, 6C) and a predetermined number of reflected light detection devices (7A, 7B, 7C) are arranged, and the slit light projection device (6A, 6B, 6C) is directed toward the long material (1), respectively. The reflected light of the projected light is reflected by the reflected light detecting device (7A, 7B, 7C), and the contour portion of the long material (1) is
(A, B, C), and each reflected light detector (7A, 7B, 7)
(C) provides a cross-sectional shape measuring method for measuring the cross-sectional shape of the long material (1) by synthesizing the contour portion (A, B, C) detected by The present invention provides a cross-sectional shape measuring method for detecting a deviation from the axis of (1) and correcting the cross-sectional shape.

[0005]

[Operation] Slit light is projected from each of the slit light projection devices (6A, 6B, 6C) onto a predetermined portion of the long material (1) moving in the longitudinal direction, and the reflected light is reflected by the reflected light detection device (7A , 7B, 7C)
Are detected as contour portions (A, B, C) of the long material (1), respectively. By synthesizing the detected contour portions (A, B, C), the cross-sectional shape of the long material (1) can be measured.

However, when the axis of the long material (1) is deviated from the reference axis, an error occurs in the measured cross-sectional shape. Therefore, the deviation is detected and the cross-sectional shape is corrected.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to one embodiment shown in FIGS. 1 to 3. (1) is a bar-shaped steel material manufactured by continuous casting and rolled into a predetermined circular cross section. Is moving in the direction. Three slit light projection devices (6A, 6B, 6C) and three reflected light detection devices (7A, 7B, 7C) are arranged around the elongated material at predetermined positions. The slit light projection device (6A, 6B, 6C) includes a semiconductor laser oscillator (61), a slit light generation lens (62, 63) and a slit, respectively.
(64), and the reflected light detection devices (7A, 7B, 7C) each include a lens (71) and a CCD sensor (72). And the slit light projection device (6A, 6B, 6C) and reflected light detection device (7A, 7A
B, 7C) are arranged in the same plane including the y-axis parallel to the moving direction of the steel material (1) as the reference axis and the x-axis orthogonal to the y-axis.

Further, as a deviation detecting device, a lamp (2), a light projecting lens (3), a light receiving lens (4) and a CCD sensor (5) are arranged on the upper row of the steel material (1) in the x direction. , Y
Lamp (8), light projecting lens (9) in front of steel material (1), light receiving lens (10), CCD sensor (11) in the rear direction
Are arranged.

In the above device, the slit light projection device (6
When slit light is projected onto the steel material (1) from (A, 6B, 6C) respectively,
The slit light is reflected on the peripheral surface of the steel material (1) and a reflected light detection device
By (7A, 7B, 7C), respectively, the arc-shaped contour portion A shown in FIG. 2,
It is detected as B and C.

At the same time, the light from the lamp (2, 8) is projected onto the lens (3,
9) It is projected as a parallel light flux on the light receiving lens (4, 10) side, and the steel material (1) is projected on the CCD sensor (5, 11) from the x direction and the y direction, respectively, and the axis A of the steel material (1) is used as a reference. The deviation from the x-axis and the y-axis as axes is measured.

If, for example, the axis A of the steel material (1) is deviated from the x axis or the y axis by an angle θ as shown in FIG. 3, the distance D'between the two points on the measured contour P '(dotted line).
And the actual distance P between the two points on the contour P (solid line) is D = D ′ / cos θ. Therefore, the deviation of the axis A of the steel material (1) from the x direction and the y direction is measured, the contour portions A, B and C measured by the above equation are corrected, and the actual contour P shown in FIG. 2 is synthesized by signal processing. To do.

Other than the above embodiment, two or three or more slit light projection devices and reflected light detection devices may be arranged, but the contour must be detected over the entire circumference of the long material. Further, when the deviation between the x-axis and / or y-axis and the axis A of the long material is small, the deviation detecting device in the x-direction and / or the y-direction is not necessary. The reference axis does not necessarily have to be the y-axis parallel to the moving direction of the long material.

[0013]

Therefore, in the present invention, the cross-sectional shape of a predetermined portion of a long material can be accurately measured.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 relate to an embodiment of the present invention.

FIG. 1 is an explanatory diagram of the apparatus

FIG. 2 is an explanatory diagram of signal processing.

FIG. 3 is an explanatory diagram of deviation correction

FIG. 4 is a conventional explanatory diagram.

[Explanation of symbols]

 1 Steel (long material) 6A, 6B, 6C Slit light projection device 7A, 7B, 7C Reflected light detection device

Claims (2)

[Claims] 1. When measuring the cross-sectional shape of a long material moving in the longitudinal direction, a predetermined number of slit light projection devices and a predetermined number of reflected light detection devices are arranged around the long material at predetermined positions. , The reflected light of the light respectively projected from the slit light projection device toward the elongated material is detected as the contour portion of the elongated material by the reflected light detection device, and is detected by each reflected light detection device. A cross-sectional shape measuring method, characterized in that the cross-sectional shape of the long material is measured by synthesizing the contoured portions. 2. The cross-sectional shape measuring method according to claim 1, wherein a deviation between the reference axis and the axis of the long material is detected to correct the cross-sectional shape.