JP2007017202A - Apparatus for measuring dimensions and shape of rolled material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for measuring dimensions and a shape which can measure the dimensions and shape of a rolled material such as bar steel and wire rod rolled by a rolling machine constantly and surely. <P>SOLUTION: A light emitting device 4 for emitting a collimated light beam 6 and a first CCD light receiving device 8 for receiving the collimated light beam are arranged by facing each other across the rolled material 1 such as bar steel and wire rod which has been just rolled by the rolling machine and is moving in the longitudinal direction. Second and third CCD light receiving devices 12, 13 which can detect the reflected light of the collimated light beam for each part of the rolled material are arranged by facing each other at both side positions perpendicular to the collimated light and the moving direction of the rolled material. The dimensions and shape of the rolled material are measured on the basis of the light receiving status of the CCD light receiving devices. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for optically measuring the size and shape of a rolled material such as a steel bar or wire.

A long member such as a wire rod is inserted into a through hole provided in the center of the rotating disk, and a projector and a light receiver are arranged on the rotating disk so as to sandwich the wire, and the rotating disk is rotated. An optical dimension measuring apparatus that continuously detects the outer diameter of the wire rod by moving is known from Patent Documents 1 and 2 listed below.
JP 2000-131021 A JP 54-94064 A

By the way, rolling materials such as steel bars and wire rods moving in the longitudinal direction by being rolled by a rolling mill may cause twisting synchronized with the rotational movement of the rotating disk. Even if it is deformed into an elliptical shape, a daruma shape, or has burrs, it may not be detected.
The present invention eliminates the above-mentioned drawbacks and provides an apparatus that can always reliably measure the size and shape of a rolled material.

  For this purpose, the rolled shape and shape measuring apparatus according to the present invention moves the projector in the longitudinal direction immediately after being rolled by the rolling machine and the projector for irradiating the parallel rays and the first CCD receiver for receiving the parallel rays. The rolled material such as steel bars and wire rods are arranged so as to be sandwiched from both sides, and the reflected light of the parallel light beam is detected for each portion of the rolled material at both sides perpendicular to the moving direction of the parallel light beam and the rolled material. The obtained second and third CCD light receivers are arranged to face each other, and the size and shape of the rolled material are measured from the light receiving state of each CCD light receiver.

  Immediately after being rolled by a rolling mill, the size and shape of a rolled material such as a steel bar or wire moving in the longitudinal direction can always be reliably measured.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an outline of a dimension / shape measuring apparatus according to the present invention, and 1 is a rolled material such as a steel bar or a wire rod which is moved in the longitudinal direction immediately after being hot-rolled to a predetermined diameter by a rolling mill (not shown). Reference numeral 2 denotes a rotating disk formed with a through hole 3 through which the rolled material 1 is inserted, and the rotating disk can be rotated in the direction of an arrow by a motor (not shown). 4 is a projector provided on the rotating disk 2. The projector 4 is a laser diode 5 that oscillates blue-violet light having a wavelength of about 400 nm, and a collimator that irradiates the rolled material 1 with the light as a parallel light beam 6. It consists of a meter lens 7. Reference numeral 8 denotes a first CCD light receiver provided on the opposite side of the rotating disk 2 with the rolled material 1 in between. The light receiver includes a collimator lens 9 and a number of CCD light receiving elements arranged in parallel on the substrate. The collimator lens 9 condenses the parallel light beam 6 emitted from the projector 4 on the CCD light receiving element substrate 10. In addition, 11 is a band pass filter provided in order to block the infrared rays radiated from the rolled material 1.

  In addition, the second CCD light receiver 12 and the third CCD light receiver 13 are disposed opposite to each other on the rotating disk 2 at both sides orthogonal to the parallel light beam 6 and the moving direction of the rolled material 1. The light receivers 12 and 13 are CCD light receiving element substrates 4 and 15 in which a large number of CCD light receiving elements are arranged in parallel on the substrate, and an optical lens 16 for condensing light from the rolling material 1 on the CCD light receiving element substrate. , 17, and band pass filters 18, 19 for blocking infrared rays radiated from the rolled material 1 are provided on the front surface of the optical lens. Therefore, the reflected light reflected in the orthogonal direction of the parallel light beam 6 irradiated on the rolled material 1 can be detected for each part of the rolled material 1 by the CCD light receiving element substrates 14 and 15.

FIG. 2 shows the light receiving state of each of the CCD light receivers 8, 12, and 13 when the cross-sectional shape of the rolled material 1 is a perfect circle. The diameter of the rolled material 1 can be measured from the width W ₁ obtained by signal processing since the amount of received light is equal to or less than a predetermined threshold. Also, since the CCD light receiver 12 and the CCD light receiver 13 receive the reflected light which is reflected in the orthogonal direction when the parallel light beam 6 hits the rolling material 1, the amount of reflected light incident on the CCD light receivers 12 and 13 is as follows. As shown in the figure, the half portion on the side of the projector 4 is remarkably enlarged, and the width W ₂ and the width W ₃ are obtained by performing signal processing with a predetermined threshold value. Then, by confirming that the width W ₂ and the width W ₃ are half of the width W ₁ by calculation, it is detected that the rolled material 1 is a perfect circle. That is, the condition that the strip 1 is true circle _{is W 1/2 = W 2 =} W 3.

On the other hand, as shown in FIG. 3, when the rolled material 1 is elliptical and twisted obliquely with respect to the parallel light beam 6, the distribution of the reflected light that hits the rolled material 1 and is reflected in the orthogonal direction is CCD photodetector 13 and different from the value of the value and the width W ₃ width W ₂ which is calculated by the signal processing is significantly different from the large in, whereby the strip 1 is detected that not a perfect circle.

Further, as shown in FIG. 4 or 5, when the rolled material 1 is elliptical and directly opposed to the parallel light beam 6, the width W ₂ and the width W ₃ are 2 of the width W ₁ . Since it is no longer a fraction, it is detected that the rolled material 1 is not a perfect circle. Similarly, when the rolled material 1 is deformed to a daruma shape or the like, or the burrs are formed, the values of W ₁ , W _2, and W ₃ show abnormalities. A shape abnormality can be detected. Further, the shape abnormality can be detected from the difference in distribution position between W ₂ and W ₃ . In any case, even if the rolled material 1 is twisted, it is possible to easily monitor the dimension of the rolled material and the shape abnormality thereof based on the light reception status of the three CCD light receivers 8, 12, and 13. .

It is the schematic of the dimension shape measuring apparatus of the rolling material which concerns on this invention. Explanatory drawing which shows the light reception condition of each light receiver in the measuring apparatus of FIG. Explanatory drawing which shows the light reception condition of each light receiver in the measuring apparatus of FIG. Explanatory drawing which shows the light reception condition of each light receiver in the measuring apparatus of FIG. Explanatory drawing which shows the light reception condition of each light receiver in the measuring apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolled material 2 Rotating disk 3 Through-hole 4 Projector 5 Laser diode 6 Parallel light 7 Collimator lens 8 1st CCD light receiver 9 Collimator lens 11 Band pass filter 12 2nd CCD light receiver 13 3rd CCD light reception 16 and 17 Optical lens 18 and 19 Band pass filter

Claims (1)

  A projector that irradiates parallel light beams and a first CCD light receiver that receives the parallel light beams are arranged so as to sandwich a rolled material such as a bar or wire that is moved in the longitudinal direction immediately after being rolled by a rolling mill. In addition, second and third CCD receivers that can detect the reflected light of the parallel light beam for each part of the rolled material are arranged opposite to the parallel light beam and the side parts orthogonal to the moving direction of the rolled material, An apparatus for measuring a dimension and shape of a rolled material, wherein the size and shape of the rolled material are measured from the light reception status of each CCD light receiver.

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