JPH087057B2 - Board width measurement method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for measuring a plate width of a steel plate, a non-ferrous metal or the like.

[Prior Art] Conventionally, in the case of continuously measuring the plate width online, as shown in FIG. 4, the photoelectric tubes 42 are arranged near both ends of the plate 41, and when the projected light is received, the The board width was determined based on the interrupted position.

However, tension is applied to the plate in order to pass it on the line, and bending occurs in the plate width direction as shown in Fig. 4. In the measurement method described above, the bending is also included, so the actual plate width is measured. It was not done, and it was hard to say that the measurement accuracy was always good.

[Problems to be Solved by the Invention] The present invention solves the problems of the prior art described above,
It is intended to provide a plate width measuring method for measuring an actual plate width by simultaneously measuring and correcting the amount of deflection in the plate width direction that has occurred during sheet passing.

[Means for Solving the Problems] The present invention provides a method for measuring a strip width when a strip-shaped coil is passed through a conditioning facility by using a strip width measuring instrument and a flexure measuring instrument, and is generated by strip tension. There is a gist in the plate width measuring method characterized by continuously measuring the plate width while correcting the deflection of the plate width method.

[Operation] In the present invention, the strip coil may be a steel plate, a non-ferrous metal, or the like. The strip coil may be accurately passed after passing it through a conditioning facility, that is, a slitter, a trimmer, a shear line, or a straightening line. It is intended to continuously measure the strip width online.

The present invention can be used in a line, for example, as shown in FIG.
The continuous plate width measuring device 1 and the plate flexure measuring device 2 are installed at the same position, the flexure measuring device 2 measures the shape of the plate 3 in the plate width direction, and the flexure data and the plate width measuring device 1 are used. The true plate width W is calculated by computer processing by inputting the data of the width W'to a computer.

The deflection measuring device 2 will be described in detail. As shown in FIG. 1, a laser beam from a laser light source 4 provided in the deflection measuring device 2 is applied to each plate surface 3 in the plate width direction and its reflected light is reflected. Is also received by the light receiving CCD element 5 mounted on the deflection measuring device 2 and is scanned to draw a plate shape. A commercially available optator (Matsushita Trading Co., Ltd.) is an example of this deflection measuring device.

[Examples] The present invention will be specifically described with reference to Examples.

The process of measuring the plate width will be described using the device shown in FIG.

The plate width W ′ is measured by the plate width measuring device 1.

The shape of the actual plate 3 is detected by the deflection measuring device as shown in FIG.

The information from and is input to the computer to obtain the true plate width W.

More specifically, the shape of the plate 3 drawn in the step is divided into minute sections as shown in FIG.
The distance of each small sections _{W 1, W 2, W 3} , ..., and W _n, assuming a right triangle having the hypotenuse distance of each small sections, each of the base _{l 1, l 2, l 3} , ... , l _n, and the opposite sides of each are h ₁ , h ₂ , h ₃ ,…,
h _n .

From the above, W ₁ = (l ₁ ² + h ₁ ² ) ^1/2 , W ₂ = (l ₂ ² + h ₂ ² )
The equation of ^1/2 , ..., W _n = (l _n ² + h _n ² ) ^1/2 is established. continue To calculate.

Then, the formula W ″ / l = W / W ′ holds. Therefore, the true plate width W is W = W ′ × (W ″ / l), and W ″ / l
The value is corrected.

The comparison between the corrected and uncorrected ones depends on the amount of deflection due to the line tension, but the value of W-W 'has a difference of 0.1 to 0.4 mm.

[Effects of the Invention] As described above, according to the present invention, when a product having a deflection is measured by the deflection correction, an error is about ± 50 μm when compared with an actual measurement value by calipers,
It is now possible to perform continuous measurements with the same accuracy as calipers measurements over the entire length of the coil, including the middle part, which was not possible during conventional coil threading.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an apparatus for carrying out the present invention,
FIG. 2 is a diagram showing the shape of the plate obtained by the deflection measuring device, and FIG. 3 is a graph for calculating the true length by breaking down FIG. FIG. 4 is a schematic diagram showing a conventional technique. 1 ... Plate width measuring device, 2 ... Deflection measuring device, 3 ... Plate, 4
...... Laser light source, 5 …… Receiving CCD element, 41 …… Plate, 42…
… Photocell.

Claims (1)

[Claims] 1. A plate width measuring method for passing a strip-shaped coil through a refining facility, using a plate width measuring device and a bending measuring device while compensating for bending in the plate width direction caused by plate passing tension. A plate width measuring method characterized by continuously measuring the plate width.