JPS6374515A - Method and device for cutting steel sheet - Google Patents

Abstract

PURPOSE:To reduce a margin of each cut and to save manpower in the cutting work in a method for cutting a product cut sheet from a rolled steel sheet according to a required dimension by automatically adjusting an intermediate cut position according to a camber of the steel sheet. CONSTITUTION:A steel sheet 4, after being cooled, is sent one by one to a steel sheet shape recognition device PSG5 and its measured result is sent to a computer 6. Then a scribe command is sent to a scribe device 7, cut commands of front and rear end crops and intermediate cut to a crop shear 8, a sheet width command to a side shear 10, a cut layout command to a side shear 10 and a cut layout command to an end shear 9. Of the above-mentioned devices, PSG5 measures a longitudinal position of the steel sheet by means of a measuring roll 51 and a pulse generator 52 while right and left edge positions in a lateral direction are measured by means of an edge meter 53. And yield is improved by performing determinations regarding the crop cut position, the cut layout, the intermediate cut position, and the cut layout.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method and apparatus for cutting rolled thick plates, particularly steel plates.

(b) In conventional thick plate rolling, camber may occur in the steel plate due to various reasons. If a normal steel plate does not have a camber, it is the starting position where the product can be sampled during sizing work, that is, the position where the effective width calculated from the specified width of the finished product starts to be secured on the rolled steel plate (top ) and the starting position (bottom), which cannot be secured on the bottom side, are set by visual inspection by a size cutter, and the cutting line is marked on the steel plate using an automatic marking device. Then,
Cut the abnormal shape part (fishtail or tongue) at the tip using this top score line, then determine the length using a shear gauge according to the ordered length, and cut to the specified length using the end 9 shear. It was cut into plates one after another.

If there is camber, the cutting line of the product will be diagonal, so it may be necessary to cut the steel plate twice or more at approximately the center in the longitudinal direction), so it is necessary to remove the influence of camber before cutting. If you make a mistake in the middle 9th position, you will not be able to get the ordered length plate, but you will be able to get the end plate length.

For this reason, it is necessary to make a mid-cut at an appropriate position along the board length.

Currently, it is necessary to inspect the presence of camber and make a mid-cut to remove the camber, but the operator's experience has been relied upon to determine the appropriate location for the mid-cut.

Such manual sizing work is inefficient, has poor accuracy, and causes a reduction in the yield of board cutting.

Therefore, in Japanese Patent Application Laid-Open No. 56-163824, it is possible to utilize the fact that a rolled steel plate has a margin in the product cut plate and calculate the mid-cut position in advance to effectively utilize the margin. Discloses a method for cutting steel plates that prevents products from being short in length.

In conventional cutting operations, all operations were generally performed in this way, based on the order of product removal determined when designing the rolling slab. Slab design and rolling work instructions were performed with a sufficient margin for cutting in the length direction of the rolled steel plate and a sufficiently large margin for side trimming in the width direction.

However, in recent years, as rolling precision has improved, the above-mentioned margin has been reduced to improve yield. In particular, the edges in the width direction of the steel plate can be rolled using vertical rolls, etc., so that a steel plate with a nearly straight shape can be obtained, and only the margin necessary for cutting is required. There was a camber, and it was not possible to reduce the margin for that camber.

On the other hand, as one of the above-mentioned allowances in the length direction, since the portions of the leading and trailing ends that do not become a product are large, it is better to roll the steel plate as long as possible at the time of design, so that the leading and trailing ends allowance can be reduced. Therefore, extremely long (for example, 40 m long) steel plates were rolled, which resulted in a large amount of camber, which was one of the causes of a decrease in yield.

In such cases (when the camber is large), the operator visually inspects the center of the workpiece and performs mid-cutting at an appropriate position from the maximum camber position and the order of the cutout, allowing for a small margin (in the length direction). .

As a shape measuring device for steel plates, Japanese Patent Application Laid-Open No. 50-65252
In Japanese Patent Application Laid-open No. 5/1114262, a combination of a steel plate edge detector and a detector in the conveying direction is used, or a two-dimensional image pickup tube is used to detect the width and length in the same device. For example, the cutting start position and the final product position are detected by a detection device, and cutting is performed according to instructions from the device.

However, regarding the aforementioned camber, although it has been possible to measure the amount of camber by applying the above-mentioned device, there is no suitable method for its application and cutting instructions, and it still relies on the experience of the operator. Ta.

The measurement device mentioned above also had problems with accuracy, but -dimensional CCD
With the commercialization of solid-state imaging devices (solid-state image sensors), accuracy has increased,
Automation reliability has improved.

()・)Problems to be Solved by the Invention The problems to be solved by the present invention are to reduce each cutting margin by automatically adjusting the center position according to the camber of the steel plate, and to The purpose is to save labor in cutting work.

(d) Means for Solving the Problems The steel plate cutting method of the present invention is a steel plate cutting method in which pear-cut plates are cut according to required dimensions from a rolled steel plate, and the steel plate is cut at each position (x) in the longitudinal direction of the steel plate. Measuring the width edge position (y), determining the product removal start position (xT) and end position from the measured value, and determining the camber amount (yC) and maximum camber position (xC) of the steel plate from the measured value. Determine whether or not the number of products can be cut at the maximum camber position (xC), and if not, change the order of product cutting so that the possible center cutting position (xM) is at the maximum camber position (xC). The above problem is solved by performing product blanking and mid-cutting in a similar blanking order.

The steel plate cutting device of the present invention is a steel plate cutting device that cuts a product cut plate according to required dimensions from a rolled steel plate, and includes a steel plate shape detection device including a steel plate width edge position detector and a steel plate conveyance amount measuring device; a calculation device that determines the cutting position from the width edge position of the steel plate obtained by the detection device; a scribing device that displays the cutting position according to instructions from the calculation device;・The above problems are solved by configuring the machine to include cutting machines that perform board cutting.

(e) Examples Examples of the method and apparatus of the present invention will be described with reference to the drawings.

First, FIG. 1 schematically shows the steps of the method of the present invention.

The slab heated in the heating furnace 1 is rolled in a rolling mill 2 to become a thick steel plate 4, and then cooled in a cooling bed 3.

The cooled steel plates 4 are passed through a steel plate shape recognition device (hereinafter referred to as P) one by one.
It's called SG. ) 5 to grasp the planar shape of the steel plate. The measurement results from the PSG are sent to the computer 6,
Here, the processing to be described later is carried out, and each position scribing command is sent to the scribing device 7, the front/rear end cropping and mid-edge cutting commands are sent to the crop shear 8, the board width command is sent to the site 9/shear 10, and the board cutting command is sent to the two points. 9 and Sha9, respectively.

The cut plates cut to the required dimensions are sent to the inspection process.

In PSG5, the longitudinal position of the steel plate (
x) is measured, and the edge measuring device 53 measures the left and right edge positions (yA, yB) in the width direction of the steel plate.

In the computer 6, the above position (x, yA, yB
), the left and right edge trajectories are measured, and based on that, the crop cutting position, board cutting judgment, middle cutting position judgment,
Itadori decision is made.

The processing in the computer 6 will be explained below.

Camber measurement> As shown in Figure 2, each point (xo
,Xl,...,X5. x6. x7. X8. xo
,...) in the width direction (y) of the steel plate (yAo).

YBo, 'fBo + yAl r YB1r□°
゛+YAsr yB5 + yA6 + YB6
+ yA7 r yB7 +yAs + YBs l
yA9r yB91...) is measured.

In this way, the length and width coordinates (xQ, yAn, yB
Understand the planar shape of the steel plate based on n).

From the time when the tip of the steel plate reaches the width meter measurement position, the measurement results of the width meter are continued every time a pulse signal is received, and the -length-width coordinates (xn, yAn), (xn+yBn) are calculated as the sheet width or plate. Check the width variation and find the product sampling start range/position. After that, length measurement is started using a measuring roll.

<Camber center line> The center line at point Xn is determined by the following equation (1).

yAn + yBn Center position yn=□ (1) The locus of the center line is represented by a set of (xn, yn).

Assuming that both end points Ihi (xo, yo) + (xKI 3'E), the camber amount Cn at Xn, yn is expressed by equation (2) as shown in FIG.

ba=cn Therefore, Xn is X. Cr1 is found between -X2. In practice, in order to correct for errors in measuring instruments, variations, and local unevenness of the board, it is preferable to take a three-point moving average of camber or an N-point moving average.

For example, in the case of the three-point average, it can be calculated as follows.

(n21 to 3-1) This is defined as the average camber C2. As a result, the maximum camber value "I C'max l" and the maximum camber position=Xo are determined.

<Determination of Cutting Position> A method for comparing the center line locus data with the ordered length data and determining the cutting position will be described below. First, the logic for determining the camber position and the mid-cut position will be explained. The maximum camber position X is determined by comparing the longitudinal position of the maximum camber found above (maximum camber position XC) with the cumulative ordered length as shown in FIG. , yo) Select a candidate position for the hollow hole in a nearby place. Furthermore, as shown in FIG. 5, the product stripping permutation is changed to select a combination that has the closest relationship between the hollow hole candidate position and the maximum camber position.

In this case, if the number of products is N, then 1. / combinations will be tried.

In this example, products 1 to 4 are lined up and the camber position versus mid-cut position is compared in this order. Then after this attempt,
By changing the combinations of the nine board cutting terms of products 1 to 4, the hollow hole candidate position where the maximum camber position and the board boundary are closest is selected.

The logic for determining the hollow hole candidate position is shown in FIG. In the figure, in (1) to (2), it is determined at which position (plate) of the total ordered length the maximum camber position is located. In (2), the front plate boundary line difference (ρ□) and the rear plate boundary line difference (f12) are determined based on the cumulative length position determined above.

In ■ to ■, by comparing l□ and R2, find the one closest to the thickest camber position. In ① to ①, the order of plate cutting J @ plate cutting # that can obtain a plate boundary position (hollow hole candidate position) near the maximum camber position by changing the combination is determined.

Using the above method, after calculating the mid-shelf position and the itadori-shi order, the maximum harvestable width of the front and back boards (
Figure 7) is obtained. Check again whether this width satisfies the effective width calculated from the product width (effective width of the front plate group and effective width of the rear plate group), and if both the front plate and the rear plate are satisfied, the final cutting position is determined. shall be.

Specific Example> A shape detection device is installed on the exit side of the cooling bed of a thick plate production line,
A marking device was installed in front of the crop shear, and instructions from the computer were displayed on terminals in the operation rooms of the crop shear, side shear, and encoder shear.

As a test material, a product cutting area material with a width of 4rrL x length of 40m was used, and even with an average camber amount of 15mm, it was possible to improve the yield by 0.2% based on the slab design value. In other words, it is now possible to produce the same product with a slab that weighs 0.2 inch less than the conventionally designed slab.

In the past, there were 2 to 3 cases per month (however, there were about 10 cases per month where the board could not be cut due to camber, resulting in process troubles (requiring urgent measures such as photographing another rolled material).
However, when the method of the present invention was applied, this did not occur at all.

(to) Effect According to the present invention, the following effects can be obtained.

■ Automatic setting of mid-cut cutting position with camber quantification improves accuracy and improves board cutting yield.

■ Product cutting accuracy can be improved by automatically setting or instructing the product collection range in consideration of width fluctuations.

■ Improving work efficiency with lower process cutting work instructions.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a schematic configuration of the method of the present invention. Figure 2 is a graph showing the principle of camber measurement. FIG. 3 is an explanatory diagram showing camber calculation. FIG. 4 is an explanatory diagram of a product stripping plan before applying the method of the present invention. FIG. 5 is an explanatory diagram of a product stripping plan to which the method of the present invention is applied. FIG. 6 shows the logic of how to find the mid-cut candidate position. FIG. 7 is an explanatory diagram showing how to determine the maximum width that can be collected from the front plate and the rear plate. 2: Rolling mill 3: Cooling bed 4: Steel plate 5: PSG 6: Computer 7: Scoring device 8: Crop shear 9: End shear 10: Side shear Patent applicant Sumitomo Metal Industries, Ltd. (5 others)

Claims (2)

[Claims] (1) In the steel plate cutting method of cutting product plates according to required dimensions from rolled steel plates, the plate width edge position (y) at each position (x) in the length direction of the steel plate is measured, and product cutting is started from the measured value. Determining the position (x_T) and end position, determining the camber amount (y_C) and maximum camber position (x_C) of the steel plate from the measured values, and determining whether or not the product width can be obtained at the maximum camber position (x_C). If this is not possible, the product board cutting order is changed so that the mid-cutting possible position (x_M) is the maximum camber position (x_M).
A steel plate cutting method comprising performing product board cutting and mid-cutting in a board cutting order similar to C). (2) In a steel plate cutting device that cuts product plates according to required dimensions from a rolled steel plate, a steel plate shape detection device equipped with a steel plate width edge position detector and a steel plate conveyance amount measuring device;
A calculation device that determines the cutting position from the width edge position of the steel plate obtained by the detection device, a scribing device that displays the cutting position according to instructions from the calculation device, and a center cut, width cut, A steel plate cutting device consisting of each cutting machine that performs sheet cutting.