JPS63198808A - Method and device for optical shape detection of rolled stock - Google Patents

Abstract

PURPOSE:To detect the strain of a rolled stock with high accuracy by irradiating the rolled material by plural rod type light sources and adding the quantities of distortion of plural reflected light beams from the rolled stock. CONSTITUTION:Plural slits 3a and 3b are formed in a slit plate 3 and light passed through those slits 3a and 3b is projected on the rolled stock 1. Reflected light beams R1 and R2 reflected by the rolled stock 1 are picked up by an image pickup camera 4 and monitored on a monitor 5. Further, the picked-up image signal is binarized by a binarization signal generating circuit 7, which is integrated by an integration circuit 8. An arithmetic circuit 9 calculates the strain of the rolled stock 1 from the integral output. A control circuit 10 controls the rolling condition of the rolled stock 1 according to the calculated strain quantity. Thus, plural quantities of strain based on the reflected light beams are summed up to detect the strain of the rolled stock, so the detection accuracy is improved.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a method for detecting a rolled material that improves the accuracy of shape detection of the rolled material by capturing reflected images (virtual images) of a plurality of rod-shaped light sources on the rolled material. The present invention relates to an optical shape detection method and an apparatus thereof.

[Conventional technology]

As a conventional optical shape detection device for rolled material, for example, [
Magnetism and processing Vo1.121'h124 (1971-5)
There is something shown in J. The fourth base shows an optical shape detection device for this rolled material, which irradiates the rolled material 1 rolled by the rolling mill 2 with light from a rod-shaped light source 11, and captures the reflected image (virtual image) with a television camera 4. Displayed on monitor 5,
The strain in the rolled material 1 is detected based on a predetermined detection operation. Since this detection device performs non-contact detection, it is not related to the magnetism of the rolled material or the height of the waves, in other words, it is unrelated to the material of the rolled material (copper-based material, Fe-based material). There are advantages that can be applied to The detection accuracy is given by the wave pitch I5 of the rolled material and the wave height m, steepness λ=m/L
When xlOO=about 0.5%, a predetermined accuracy can be obtained for hot-rolled materials and wide-width materials.

[Problem that the invention seeks to solve]

However, according to the conventional optical shape detection device for rolled materials,
When the plate width is as narrow as 200 mm or less, the distortion of the reflected image due to the irradiation from the rod-shaped light source becomes small, resulting in a disadvantage that the detection accuracy decreases. In addition, distortion is easily affected by the front and back tension of the rolled material, and the front tension is 20kgf/+az.
If it becomes larger than the center part (T, ) and end part (T8) of the plate,
), the tension difference T,, l-T, becomes small, so the distortion waves disappear at first glance, and the distortion of the bar-shaped light source image becomes invisible, resulting in a problem that the precision of shape detection decreases or becomes impossible.

In recent years, with electronic component materials such as IC lead frames, due to the remarkable progress in miniaturization of devices and higher integration of devices, not only the dimensions and shape of lead frames but also the precision of temporary crowns are required to be increasingly high. It has become.

Against this background, it is desired to improve the shape accuracy of cladding materials for IC lead frames.

It is also desired to obtain data necessary for controlling rolling conditions by performing numerical processing in a short time.

[Means for solving problems]

The present invention has been made in view of the above, and in order to enable highly accurate shape detection even when the width of one rolled material is as narrow as 20011 mm or less, or during a rolled material line where longitudinal tension is being applied. A method and device for optical shape detection of a rolled material, in which the rolled material is irradiated with a plurality of bar-shaped lights tX (including light passing through multiple slits) and a plurality of strain amounts of each reflected light (virtual image) are added. This is what we provide.

〔Example〕

FIG. 1 (al indicates the first embodiment of the present invention, and the rolled material (
Roller 1 (4-high rolling mill with work roll diameter φ100) 2 that rolls composite material (composite material with plate width 60 mm and plate thickness 0.4 fin) 1, and 2 rollers with slit width Pb = 10 + u and slit interval PL = 50. Slit plate 3 that emits the lights 3a and 3b
(the light source is not particularly shown), a television camera 4 that detects the reflected images R1 and R2 of the slit lights 3a and 3b irradiated onto the rolled material 1, and a television camera 4 that detects the reflected images R1 and R2 detected by the television camera 4. It has a monitor (CRT) 5 for displaying.

In addition to the above configuration, FIG.
, a binary signal generation circuit 7 that compares the video signal with a predetermined slice level and generates white and black binary signals, and an integral operation when an AND condition is established between the binary signal rLJ and the sampling signal. an integrating circuit 8 that continues m from the start to the end of the scanning line; an arithmetic circuit 9 that performs edge wave, center wave, etc. calculations based on the integral value output of the integrating circuit 8; It has a rolling device control circuit 10 that controls the rolling conditions (including longitudinal tension) of the rolled material 2 based on the rolling conditions.

The operation will be explained in the above configuration. A rolled material 1 that has been rolled and formed by a rolling mill 2 is irradiated with slit lights 3a and 3b that have passed through a slit plate 3 whose irradiation angle (θ) is set to 85'' to obtain reflected images R,,R,.Reflected images R+ and Rz become two distorted lines depending on the strain of the rolled material 1, for example, as shown in the figure. Fig. 1 (bl indicates this), and the strain (medium elongation: center wave) in the rolled material 1. The reflected images R, , R2 are captured by the television camera 4 and displayed on the monitor 5, and the video signal from the video signal generation circuit 6 is converted into a 24-fi signal generation circuit 7. The arithmetic circuit 9 calculates the integrated signal of the integrating circuit 8 based on the binarized signal.Thereby, distortion can be properly detected.

In other words, the distortion of the rolled material 1, in other words, the distortion of the reflected images R1 and R2, is determined by the reflection line R+ by using two-line passing light.
, Rz. Here, calculate the distance between the reflection lines (light source width) on the board edge side. , Distortion length Ll in the rolling direction at the center of the reflected image R1, Distortion length R3 in the rolling direction at the center of the reflected image R2,
Length R2 of distortion in the rolling direction of the two reflected images R, , R2
As, the dimensions L1 and R2 were measured continuously in the board width direction,
When we calculate the sum, Lz +]l,, = (Lo +
R3) Ll = l, o +2Ll. With a conventional rod-shaped light source (single passing light), the forward tension is 20 kg.
f/m+e'' or more, the distortion Ll of the reflected image may become small, but in the above method, the distortion of the reflected image can be detected as 2L+ by the above equation, and the detection accuracy can be improved by more than twice. In the example, although the forward tension was 40 kg f/mu z, unrestrained elongation could be detected.The detection accuracy at this time was (L+"Lz
)/L+-(5+27.5)/5=6.5, which is 6.5 times more accurate than the conventional method. The slit width, that is, the light source width, differs in light reflectance depending on the metal on the surface of the rolled material.
';'For materials with relatively low reflectance such as e-Ni alloy, it is more suitable to use a light source width of 5 to low1. The reflection angle θ is set to 45° in order to easily capture the reflected image when capturing the reflected image with a television camera and to change the light source width L0 with the same slit passing light width.
~85°. The rolling device control circuit 10 controls the rolling conditions of the rolling mill 2 based on the above detection results.

FIG. 2 shows a second embodiment of the present invention, in which a mesh-like slit plate 16 is provided with a 50 mm (P,) constant pinch multi-slit light source 16a having a mesh shape of Surin I and width pb -5 mm as a light source. This is an example in which the shape of a narrow rolled material 1 with a plate width of 100 mm was detected using this method. The other symbols are common and their explanation will be omitted.

In the above configuration, the operation will be explained. Rolled material 1 rolled and formed by rolling mill 2 (width: 100 mm, thickness: 1.
The irradiation angle (θ) is set to 606, and the light 16a passing through the multi-slits of the mesh-like slit plate 16 is irradiated onto the composite material (Ol composite material) to obtain a reflected image RI"' R4 as shown in the figure. This reflected image R
The distortion conditions of 3 to R4 are imaged by a television camera 4, a video signal is generated, and the video signal is binarized and arithmetic processed in the same manner as in the first embodiment. FIG. 3 shows the results of CRT display 1, which shows the unrestricted elongation of the rolled material, and medium elongation was properly detected. In the second embodiment, by using a mesh light source, it is possible to detect the strain of the reflected images R3 and R4 in the vertical (longitudinal) direction, and the uneven elongation of the rolled material can be detected in the width direction (B+, L
z) and the longitudinal direction (Bl, B2) at the same time to improve detection accuracy. Also, the reason why a square mesh shape of 5 to 50 m is used is to increase or reduce the number of sections depending on the width of the rolled material. This is because it becomes difficult to distinguish strain. Although three mesh-shaped slits are used in this embodiment, it is also possible to use a large number of square slits or a large number of rectangular slits. In addition, the computer-based quantification process includes the binarization process of the video signal as in this embodiment, or the calculation based on the binarization process, as well as the video signal (
It is also possible to superimpose the reflected images R4 to R4) and the coordinate axes.

Further, as the light source of the present invention, in addition to fluorescent light, halogen light, and laser light, infrared rays and ultraviolet rays can also be used.

〔Effect of the invention〕

As explained above, according to the method and apparatus for optical shape detection of a rolled material of the present invention, the rolled material is irradiated with a plurality of rod-shaped light sources (including light passing through multiple slits), and a plurality of shapes are detected based on each reflected light. Since the strain in the rolled material is detected by adding the amount of strain, the detection accuracy can be improved.For example, if the width of the rolled material is as narrow as 200 s1 or less, or the longitudinal tension is 20 kgf/m+i2 or more, However, it is possible to accurately detect strain in rolled materials.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are explanatory diagrams of a first embodiment of the present invention. FIG. 2 is an explanatory diagram of a second embodiment of the present invention. FIG. 3 is an explanatory diagram of a CRT display of uneven elongation amount according to the second embodiment of the present invention. FIG. 4 is an explanatory diagram of an optical shape detection device using a conventional rod-shaped light source. Explanation of symbols■--Rolled material 2--Rolling mills 3a, 3
b-----Slit light 4--1--Television camera 5--1--Monitor 11-1--Bar-shaped light source 16-----1 Slit provisional 16a--1~ --Slit light Tt--1.--Front (roll exit) tension P b'--"--Slit width PL-----Slit pitch θ-------Irradiation angle L o ""'-- Corner L between the rolling direction reflection image lines on the surface of the rolled material + "-'-'-' Rolling direction distortion length B2--1-2 reflection image rolling direction distortion length B
3---Length of distortion in the rolling direction of one other single-line reflection image

Claims (7)

[Claims] (1) In an optical shape detection method for a rolled material in which the rolled material is irradiated with a rod-shaped light source and the strain of the rolled material is detected based on the reflected light, the rolled material is irradiated with a plurality of rod-shaped light sources, and the plurality of An optical shape detection method for a rolled material, comprising: imaging a plurality of reflected lights of the rolled material from a rod-shaped light source; and detecting strain in the rolled material by adding up respective amounts of strain of the plurality of reflected lights. (2) An optical detection device for a rolled material that detects strain in the rolled material based on light reflected from a rod-shaped light source by the rolled material, comprising: a plurality of rod-shaped light sources that irradiate the rolled material; and rolling of the plurality of rod-shaped light sources. an imaging means for capturing images of a plurality of reflected lights from the material; and an image pickup means for capturing an image of a plurality of reflected lights from the material, and calculating an amount of strain at each position of the rolled material corresponding to each reflected light based on the plurality of reflected lights, and calculating the amount of strain by adding the amounts of strain at each of the positions. What is claimed is: 1. An optical detection device for rolled material, characterized by comprising a calculation means for detecting. (3) The optical detection device for a rolled material according to claim 2, wherein the plurality of rod-shaped light sources are arranged at intervals corresponding to a period of a strain wave in the rolled material. (4) A claim in which the plurality of rod-shaped light sources are constituted by a slit plate having a plurality of slits formed at the intervals, and a single light source that generates slit light passing through the slits. 4. The optical detection device for rolled material according to item 3. (5) The slit plate has a slit width of 0.5 to 10 mm,
The slits are spaced apart from each other by 50 mm, and the irradiation angle is 45°.
The optical detection device for a rolled material according to claim 4, configured to be arranged on the rolled material at an angle of ~85°. (6) The optical detection device for rolled material according to claim 4, wherein the slit plate has a plurality of slits having a square mesh shape of 5 to 50 mm and a slit width of 0.5 to 10 mm. (7) The optical detection device for a rolled material according to claim 2, wherein the calculation means controls the rolling conditions of the rolling device via the rolling device control means based on the strain of the rolled material.