JPS58195112A - Method for measuring width of rolled material - Google Patents

Abstract

PURPOSE:To determine the true width W of a rolled material by disposing at least a pair of range finders on both sides of the area where the rolled material passes through so as to face each other, determining the measured width by measuring the width of the rolled material and determining the bias traveling angle theta of the rolled material. CONSTITUTION:At least a pair of range finders 13, 14 are disposed so as to face each other on both sides of the area where a rolled material 12 passes through. The respective distances measured with the range finders 13, 14 with respect to the side surfaces of the rolled materials are subtracted to measure the width of the rolled material, from which the measured width X is determined. At least a pair of range finders 16, 17 are juxtaposed on one side in the area where said rolled material passes through. The ratios that the difference between the respective distances measured with a pair of said range finders with respect to the side surfaces of the rolled material to the distance Lb at which the range finders 16, 17 are juxtaposed are calculated, whereby the bias traveling angle theta of the rolled material is determined. The errors in measurement occurring in the bias traveling of the rolled material are thus corrected and the exact width of the rolled material is determined.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring the width of a rolled material, and the present invention relates to a method for measuring the width of a rolled material using a hook. Concerning width measurement method.

For example, when manufacturing steel plates using a plate rolling mill, it is extremely important to accurately obtain the target plate width from the standpoint of improving yield. In plate rolling, as shown in Figure 111, the rolled material is heated to the required temperature, and after adjusting the shape of the rolled material by rolling, which is called forming rolling, the material is rolled to the width required for the product. In order to achieve this, the sheet is turned 90 degrees, so-called tenter rolling, to achieve the target width, and then turned 90 degrees again and further thickened to the thickness required for the monthly salary. Here, in tentering rolling, as shown in FIG. 1, the plate thickness and width before tentering rolling are 8 plates.

W5, the plate thickness and target plate width after top rolling) 12
．． When W2 is assumed, and assuming that the plate length does not change due to rolling, the F period (formula 11) holds from the condition that the volume remains unchanged after rolling bending.

HIWsL = HxW2L... (11th Gen (
By transforming equation 1), we obtain equation (2).

Hs = HxWt/Wa -...
(In other words, during set-up rolling, it is possible to perform L-force plate width control by controlling the plate thickness with the plate thickness H2 after tentering rolling as the target.The current control accuracy regarding plate thickness is high. As shown in equation (2) above, the accuracy of the target plate width W! is determined by the measurement accuracy of the initial plate width W1.

Therefore, in tentering rolling, it is necessary to accurately measure the initial strip width W1, and various hot online strip width measurement methods have been proposed.

FIG. 2 is an explanatory diagram showing a conventional method for measuring the width of a rolled material. That is, a pair of He-
A distance meter such as an optical distance meter using a Ne laser is placed facing each other at a predetermined distance, and after measuring a distance of 11.72 with respect to the - plane of the rolled material 2, the distance y is determined.
ji La distance Il, l! By reducing the width of the rolled material 2, the width of the rolled material 2 can be reduced to 6fll ffl 1iiT N@5. ′■ However, generally rolled material 2
often travels diagonally, that is, diagonally, on the table roller 1, and the oblique angle changes from time to time.

Therefore, assuming that the rolled material passes through the measurement system at an oblique angle θ with respect to the traveling direction, the strip width X measured by the strip width measuring method according to the above-mentioned conventional example is (-!7-1)
This results in a relative error of X 10056. In other words, if the true width of the rolled material 2 is 1500 square meters, if the oblique angle is 5 degrees, then if it is 5.71111.15 degrees, there will be a measurement difference of 53 square meters. However, there is a problem in that it is not possible to accurately measure the width of the rolled material.

In order to solve the above problem, a method has been proposed in the past in which side guides are provided on the measurement line to correct the skew of the rolled material, but this requires complicated equipment and requires the operation of the side guides. Therefore, it is necessary to temporarily stop the conveyance of the rolled material, which creates a new problem of impeding the rolling grinding efficiency.

The present invention corrects the plate width measurement error due to the skew of rolling i,
It is an object of the present invention to provide a method for measuring the width of a rolled material 1 that can accurately determine the width of a rolled material.

In order to achieve the above object, the method for measuring the width of a rolled material according to the present invention includes arranging at least a pair of rangefinders facing each other on both sides of a threading area of the rolled material, and distances between the opposing arrangement of the pair of rangefinders. By subtracting each measurement distance from the pair of distance meters to the side surface of the rolled material, the plate width of the rolled material is measured to obtain the measured plate width X, and the passing area of the rolled material is at least unilateralized. By arranging a pair of distance meters side by side and calculating the ratio of the difference between the measured distances of the pair of distance meters to the side surface of the rolled material to the juxtaposition distance of the pair of distance meters, the skew angle of the rolled material is calculated. θ is calculated, and the true plate width W of the rolled material is determined by multiplying the measured plate width X by the cosine value cxxxaa of the skew angle 0.

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

FIG. 3 is a plan view showing the first embodiment of the present invention. A pair of distance meters 13.degree. 14 are disposed facing each other at a distance gI.3 on both sides of the sheet passing area where the table roller 11 conveys the rolled material 12. Each ship [@''t13.14 is capable of measuring IMlx, 1g of each ship with respect to the side surface of the rolled material 12.The computing unit 15 calculates the measured plate width X of the rolled material 12 using the above equation (3). It is possible.

X = La-(lx + lx) --(31
Further, a pair of distances 1111tt14 and 16 are arranged side by side with a distance Lb between the sides of the sheet passing region of the rolled material 12. The distance tt14 is the distance between the rolled material 12 and
The distance 12 to the side surface of the rolled material 12 can be measured, and the distance meter 16 can measure the distance 13 to the side surface of the rolled material 12. The calculator 15 is capable of calculating the oblique angle 0 of the rolled material 12 using the following equation (4).

Further, the calculator 15 is capable of calculating the true width W of the rolled material 12 based on the measured plate width X and the skew angle WL# of the rolled material 12 using the following equation (5).

W=(La-(/l+jg))amθ, that is, the above first Sii! According to the embodiment, the error based on the oblique angle of the measured board width is corrected, and it becomes possible to accurately calculate the true board width. Furthermore, it is possible to accurately measure the width of the rolled material 12 while it is being continuously transported without temporarily stopping the transportation of the rolled material 12. That is, the rolled material 12 reaches the threading area and is measured at each distance 11. by each distance meter 13, 14, 16. From the moment when simultaneous measurement of Ig and is becomes possible, it becomes possible to simultaneously measure each distance 11.7 and is at appropriate time intervals and calculate the true plate width W, and also to calculate the true plate width W. By averaging the results, it is also possible to improve the measurement accuracy.

FIG. 4 is an explanatory diagram showing a second embodiment of the present invention. The second embodiment differs from the first embodiment in that a rangefinder 17 is disposed opposite the rangefinder 16 with a distance La between them. That is, c(7) second fruit! ?
! l jc distance r4・, pressure, 12°:1 On both sides of the threading area, distance 111tt13 and distance #t14,
Two pairs of distance meters each consisting of a distance meter 16 and a distance meter 17 are arranged opposite to each other, and the rolled material 12
A distance meter 14 and a distance of 5t16. Two pairs of rangefinders consisting of a combination of rangefinder 13 and distance ftt17 are arranged side by side.

Therefore, in the above WA2 embodiment, each distance m correction 1
3.14, 16.17 each measurement distance 11゜lx +
Based on Is + laK, the oblique angle of rolling 4t12 is calculated by the following formula (6), and the following (7)
The true width W of the rolled material 12 can be measured using the formula.

In other words, according to this second embodiment, the measurement accuracy of the measurement board width X and the measurement accuracy of the approximate oblique angle θ are improved, and the constant degree of cylindrical shape of the board width W can be further improved. .

(Fig. 5 is an explanatory diagram showing the third embodiment of the present invention.) This third embodiment differs from the first embodiment 1ζ in that the distance meter 16 is placed on one side of the rolled material 12. The distance meter 18 is arranged in parallel with the distance Lc between the distance meter 18 and the distance meter 18. That is, on one side of the rolling material 12 passing area, the distance meter 14 and the distance meter 16, the distance meter 16 and the distance 11t17, and the distance meter 18 are provided. Three pairs of distance meters each consisting of a total of 14 and a distance meter 17 are arranged side by side.

Therefore, according to the third embodiment, each distance #t13
, 14.16.18 each measured distance Is , Is .

Based on In, 1m, the skew angle f# can be calculated using the following equation (8), and the true plate width W can be calculated using the following equation (9).

) (8) ) That is, according to the third embodiment, the oblique angle of the rolled material 12 can be measured at high f# degrees, and the true sheet width W can be calculated more accurately.

As described above, the rolled material plate @ measurement method according to the present invention is as follows:
By arranging at least a pair of distance needles facing each other on both sides of the rolling material passing area, and subtracting each measured distance of the pair of distance meters with respect to the side surface of the rolled material from the opposing arrangement distance of the pair of distance needles, Determine the plate width of the rolled material to determine the measured plate width , by calculating the ratio of the seat of each measurement distance to the rolled material @ plane of the pair of distance needles, the oblique angle He of the rolled material is calculated.
, and the cosine value am of the above oblique angle 0 to the measured upper width X
By multiplying by #, the plate width W of ^ of the rolled material is calculated, so that the error in measuring the plate width due to the skew of the rolled material is corrected, and the accurate width of the plate is obtained without any harm to the progress of the rolled material. This has the effect that it is possible to obtain

[Brief explanation of drawings]

FIG. 1 is a process diagram showing the manufacturing process of thick plate rolling, FIG. 2 is a front view showing a conventional plate width measuring method, FIG. 3 is a plan view showing the first embodiment of the present invention, and FIG. The figure is a plan view showing a second embodiment of the invention, and FIG. 5 is a plan view showing a third embodiment of the invention. 12 Rolled material, 13.14.16.17.18...Distance meter, 15 Calculator s ``a Opposing distance s ''b + ''C... Juxtaposition distance, lh, lx, Il, la IIm
Measurement distance, X Measurement plate width - W・True plate width, 0・Oblique angle. Agent Patent Attorney Osamu Shiokawa Figure 4 Figure 5

Claims (1)

[Claims] (1) At least a pair of distance meters are arranged facing each other on both sides of the rolling material passing area, and each measured distance of the pair of distance meters with respect to the side surface of the rolled material is subtracted from the opposing arrangement distance of the pair of distance needles. By measuring the plate width of the rolled material, the measured plate width
At the same time, at least one pair of distance meters are arranged side by side on one side of the rolling material passing area, and each measured distance of the pair of distance meters with respect to the side surface of the rolled material is determined relative to the juxtaposition distance of the pair of distance meters. By calculating the ratio of the difference, the skew angle θ of the rolled material is determined, and by multiplying the measured plate width X by the cosine value O0 of the skew angle θ, the true plate width W of the rolled material is determined. How to measure the width of the desired rolled material.