JP5428884B2 - Method and apparatus for manufacturing rolled shape steel - Google Patents

Description

  The present invention relates to a method and apparatus for manufacturing a rolled steel, and specifically, a long rolled steel such as a rolled H-shaped steel or a steel sheet pile is accurately stopped at a target stop position and predetermined. The present invention relates to a method and an apparatus for producing rolled steel that can be accurately cut to a length.

FIG. 6 is an explanatory view schematically showing a manufacturing process 1 of a large factory for manufacturing a rolled section steel (in the following description, a rolled H-section steel, which is a representative example of a rolled section steel).
As shown in FIG. 6, in this production process 1, after the raw steel slab is heated to a predetermined temperature by the heating furnace 2, rough rolling by the rough rolling mill 3, rough universal rolling mill 4, edger rolling mill 5, and roughing are performed. A long rolled H-section steel is manufactured by performing intermediate rolling by the universal rolling mill 6 and finish rolling by the finishing universal rolling mill 7. The long rolled H-section steel is transported by a transport table 8 having a plurality of table rollers arranged side by side. The first hot saw 9 and the second hot saw 10 have a predetermined length according to the specifications of the final product. Disconnected. In this manner, the rolled H-section steel as the final product is manufactured.

  In order to efficiently cut the rolled H-section steel to a predetermined length by the hot saws 9 and 10, the rolled H-section steel transported by the transport table 8 is accurately stopped at a predetermined target stop position. It is necessary to perform fixed position stop control.

  The conventional fixed position stop control uses the output of the hot metal detector HMD, which is an optoelectronic switch that detects infrared rays emitted from the rolled H-section steel, as a starting point for deceleration, and after the rolled H-section steel passes the hot metal detector HMD. , By tracking the position of the rolled H-section steel 8 during conveyance by integrating the rotation number of the table motor of the conveyance table 8 using a rotation detector PLG that is directly connected to the table motor and detects the rotation number, The rolling H-section steel 8 is stopped at the target stop position by reducing the speed of the table motor according to the distance from the position where the rolled H-section steel exists to the target stop position.

  With regard to the fixed position stop control, for example, in Patent Document 1, the steel material is driven based on the current position of the steel material to be transported, and when the steel material reaches a predetermined position, the transport table is stopped to stop the steel material. In the transfer control apparatus, the movement amount estimation means for estimating the movement amount of the steel material after the drive of the conveyance table is stopped from the mass per unit length of the steel material and the total mass, and this estimated by the movement amount estimation means A correction means for correcting and setting the target stop position of the steel material at a position before the movement amount, and a drive control means for performing drive control of the transfer table based on the target stop position corrected by the correction means and the current position of the steel material A steel material conveyance control device is disclosed.

  According to this conveyance control device, the parameter P (M, L) representing the kinetic energy of the steel material, which is obtained based on the single weight which is the mass per unit length of the steel material to be conveyed in advance and the total mass of the steel material, and its Correlation as a one-dimensional model with the flow rate (the amount of steel movement caused by the inertia of the steel after the transmission of the rotational driving force to the drive roller of the conveyance table stops) is transported from the obtained one-dimensional model. It is said that the steel material can be stopped at the target stop position Q with high accuracy by calculating the flow amount of the steel material and correcting the target stop position Q of the steel material to the target stop position Q ′ which is the front of this flow amount. Yes.

Japanese Patent Laid-Open No. 9-2335014

  FIG. 7 is a graph showing the relationship between the speed of the rolled H-section steel conveyed and the distance from the tip to the stop target (stopper), that is, an example of a deceleration pattern of the rolled H-section steel. The pattern 1 in the graph of FIG. 7 shows the case where the inertia of the rolled H-section steel to be conveyed is large, or there is a top slip in the rolled H-section steel to be conveyed. Pattern 3 shows the case where the inertia of the rolled H-section steel being conveyed is small or the table roller is idling.

According to the examination results of the present inventors, since the invention disclosed by Patent Document 1 has problems 1 to 3 listed below, problems 1 to 3 will be described with reference to the graph of FIG. .
(Problem 1)
The mass and dimensions of the rolled H-section steel conveyed on the conveyance table vary depending on the product specifications. If the mass and dimensions (length, width, etc.) of the rolled H-section steel are different, the inertia of the rolled H-section steel at the time of conveyance is also different, and as a matter of course, as shown in patterns 1 to 3 in the graph of FIG. The time and distance required from the time when the sheet is conveyed at a predetermined conveying speed to the time when it is stopped also vary. However, the invention disclosed in Patent Document 1 does not take into consideration that the mass and dimensions of the steel material to be conveyed are different. Therefore, if the mass and dimensions of the rolled H-shaped steel to be conveyed are different, the rolled H-shaped steel is sufficient. Cannot stop at the target stop position with high accuracy.

(Problem 2)
FIG. 8 is an explanatory view showing the detection of the rolled H-section steels 11 and 12 by the hot metal detector HMD 13 used for the conventional fixed position stop control, and FIG. FIG. 8B shows a case where the degree of warpage occurring in the rolled H-section steel 12 is large.

  As shown in FIGS. 8A and 8B, the hot metal detector HMD 13 is installed on the side of the rolled shape steels 11 and 12 to be conveyed. For this reason, as shown in FIG. 8A, when the degree of warping inevitably occurring in the rolled H-section steel 11 is small, the tip of the rolled H-section steel 11 reaches the on position of the hot metal detector HMD13. If this is done, this can be detected accurately.

  On the other hand, as shown in FIG. 8 (b), when there is a warp in the rolled H-section steel 12, the hot metal detector HMD 13 reaches the tip end portion 14 of the rolled H-section steel 12, depending on the degree of the warpage. Since the detection timing of the rolled H-section steel 12 by the hot metal detector HMD13, that is, the tracking start timing of the rolled H-section steel 12 is delayed, an error occurs in the calculation of the transport amount of the rolled H-section steel 12, and the rolling H The shape steel 12 cannot be accurately stopped at the target stop position with high accuracy.

  Further, since the hot metal detector HMD13 is an infrared sensor, the hot metal detector HMD13 is also rolled H-section steel 11 even when the temperature of the rolled H-section steel 11 being conveyed is lower than the temperature measurable by the hot metal detector HMD13. Therefore, the rolled H-section steel 11 cannot be accurately stopped at the target stop position with high accuracy.

(Problem 3)
FIG. 9 shows that the degree of warping and bending inevitably generated in the rolled H-section steel 15 being conveyed is large, and the rotation is detected by directly connecting to the table motor 17 that drives the table roller 16 of the conveying table. It is explanatory drawing which shows typically the condition where the detector (PLG) 18 idles.

  As shown in FIG. 9, when the degree of warping or bending of the rolled H-section steel 15 is large, the rolled H-section steel 15 cannot obtain an appropriate frictional force with the table roller 16. As shown in pattern 3 in the graph of FIG. 7, the rotation detector PLG 18 also idles, the length measurement error increases, and an error occurs in the calculation of the transport amount of the rolled H-section steel 15.

  As described above, the invention disclosed in Patent Document 1 has a problem that the stop position accuracy of the rolled shape steel is insufficient when the mass, dimensions, shape, etc. of the rolled shape steel that is the table transported material fluctuate. is there.

  For this reason, according to the invention disclosed in Patent Document 1, even if the rolled shape steel transported on the transport table is stopped, the operator then visually confirms the deviation from the actual stop position with respect to the target stop position, It was necessary to finely adjust the stop position of the rolled shape steel by manual operation. Therefore, even when based on the invention disclosed in Patent Document 1, it has not been possible to completely automate the fixed position stop control of the rolled shape steel for cutting by the hot saw HS in a large factory.

The present invention relates to a method for manufacturing a rolled shape steel, in which a rolled shape steel conveyed by a conveyance table having a plurality of table rollers arranged in parallel is stopped at a target stop position and then cut into a predetermined length. When stopping the rolled shape steel, the position of the rolled shape steel is continuously measured using a two-dimensional image of the camera that photographs the rolled shape steel, and the rolling shape steel is decelerated based on the continuous measurement results. The start position is determined, and the speed of the rolled shape steel after the deceleration starts from the deceleration start position is determined in advance before the start of deceleration, and the position of the tip of the rolled shape steel during deceleration, which is a continuous measurement result. In this method, the deviation of the deceleration pattern from the position of the tip is obtained and corrected based on the obtained deviation .

From another point of view, the present invention uses a two-dimensional image of a camera for photographing a rolled steel shape, a conveying table having a plurality of table rollers arranged in parallel, and a position of the rolled steel shape conveyed by the conveying table. Measuring device for continuous measurement and determining the deceleration start position of the rolled shape steel based on the continuous measurement result of the measurement device, and the speed of the rolled shape steel after starting deceleration from the deceleration start position The deviation between the position of the tip of the rolled shape steel during deceleration, which is a continuous measurement result , and the position of this tip in a predetermined deceleration pattern before the start of deceleration is obtained and corrected based on the obtained deviation. A stop position control device for stopping the rolled shape steel conveyed by the conveyance table at the target stop position, and a cutting device for cutting the rolled shape steel stopped at the target stop position to a predetermined length. An apparatus for manufacturing a rolling shape steel, characterized in that it comprises and.

  According to the present invention, a rolled shape steel such as a rolled H-section steel or a steel sheet pile, which is conveyed on the conveyance table, is accurately stopped at a predetermined stop position, and a fine adjustment operation of the stop position of the stopped rolled shape steel is performed. Without being cut, the cutting device can cut to a predetermined length.

FIG. 1 is an explanatory diagram showing a simplified configuration example of a manufacturing apparatus according to the present invention. FIG. 2 is an explanatory diagram illustrating an example of a camera installation state. FIG. 3 is a graph showing an example of the relationship between the length of the rolled H-section steel and the stop distance. FIG. 4 is a graph showing the relationship between the speed of the rolled H-section steel conveyed and the distance from its tip to the stop target (stopper), that is, a deceleration pattern example of the rolled H-section steel according to the present invention. FIG. 5 is a graph showing the elapsed time from the start of deceleration and the distance from the deceleration start position to the target stop position in each of the present invention example and the conventional example. FIG. 6 is an explanatory view schematically showing a manufacturing process of a large factory for manufacturing rolled steel. FIG. 7 is a graph showing the relationship between the speed of the rolled H-section steel conveyed and the distance from the tip to the stop target (stopper), that is, an example of a deceleration pattern of the rolled H-section steel. FIG. 8 is an explanatory view showing detection of a rolled H-section steel by a hot metal detector HMD used for conventional fixed position stop control, and FIG. 8A is normal with a small degree of warpage occurring in the rolled H-section steel. FIG. 8B shows a case where the degree of warpage generated in the rolled H-section steel is large. FIG. 9 shows a rotation detector (directly connected to a table motor that drives a table roller of a conveyance table and detects the number of rotations because the degree of warping and bending inevitably occurring in the rolled H-section steel being conveyed is large. It is explanatory drawing which shows typically the condition where PLG) idles.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.
First, the manufacturing apparatus according to the present invention will be described. In the following description, the case where the rolled section steel is a rolled H-section steel is taken as an example, but the present invention is similarly applied to a rolled section steel other than the rolled H-section steel such as a steel sheet pile. In the following description, the mass and dimensions of the rolled H-section steel transported on the transport table are (flange width 100 mm, web height 100 mm, length 8 m and total weight 0.2 tons) to (flange width 900 mm, web height). It varies within a range of 350 mm in length, 30 m in length, and a total weight of 22 tons. Furthermore, when it illustrates also about a steel sheet pile, it fluctuates in the range of (width 400mm, length 8m and total weight 0.2 tons)-(width 900mm, length 30m and total weight 15 tons).

  FIG. 1 is an explanatory diagram showing a simplified configuration example of a manufacturing apparatus 20 according to the present invention. As shown in FIG. 1, the manufacturing apparatus 20 includes a transfer table 21, a measuring device 22, a stop position control device 23, and a cutting device (not shown), and these components will be described sequentially.

[Conveyance table 21]
The conveyance table 21 has a plurality of table rollers 24 arranged side by side, and is a device for conveying the rolled H-section steel 26 to be conveyed. A table motor (not shown) that drives each table roller 24 is provided with a rotation detector (PLG) 25.

The transfer table 21 may be any well-known and commonly used transfer table of this type, and is not limited to a specific type.
[Measurement device 22]
The measuring device 22 is a device for continuously measuring the position of the rolled H-shaped steel 26 conveyed by the conveying table 21 using a two-dimensional image of the camera 22a that photographs the rolled H-shaped steel 26. As described above, in the present invention, the measuring device 22 uses the camera 22a capable of continuously capturing a two-dimensional image of the rolled H-shaped steel 26, and uses the two-dimensional image of the camera 22a to perform rolling. The position of the H-shaped steel 26 is continuously measured.

  For example, as described above, when an attempt is made to detect the position of the rolled H-section steel 26 using an optical axis sensor such as a hot metal detector HMD as in the prior art, as described above, the rolled H-section steel that is transported on the transport table 21. Therefore, the passage of the rolled H-section steel 26 conveyed as described above may not be detected accurately.

  On the other hand, in the present invention, by continuously photographing the rolled H-section steel 26 in two dimensions, the continuous position of the camera 22a capable of accurately measuring the position of the rolled H-section steel 26 without being affected by the disturbance factor. Use images. By using the camera 22a, the detection resolution of the current position of the rolled H-section steel 26 can be greatly improved, so that the fixed position stop accuracy of the rolled H-section steel 26 can be greatly improved.

In the present invention, “continuously” means an extremely short time interval, and includes, for example, an interval of (1/100) to (1/10) seconds.
The camera 22a may determine an appropriate installation position and the number of installed cameras so that the visual field range can be covered with the resolution of the camera 22a determined from the required stop accuracy.

  FIG. 2 is an explanatory diagram showing an example of the installation status of the camera 22a. In this example, the stop accuracy required for the rolled H-section steel 26 is within ± 100 mm. Therefore, the required resolution of the camera 22a is about ¼, that is, 25 mm. The number of cameras 22a is 512 pixels per unit, and since an overlap of 0.8 m (800 mm / 25 mm = 32 pixels) at both ends is considered in the part where the field of view overlaps with the adjacent camera 22a, the camera 22a One real pixel is 512-32 × 2 = 448 pixels. If the line range to be monitored this time is 67 meters, 67 meters / (25 mm × 448) = 5.98 units, that is, six cameras 22a need to be arranged.

  The installation location of the camera 22a is preferably a location where there are no obstacles and the line can be seen, and where the camera 22a is not subjected to vibration, water vapor, or radiant heat. The distance from the line only needs to be 25 mm per pixel in combination with the lens. This time, in light of the above-mentioned installation environment conditions, it was installed at a location approximately 10 meters above the rolled H-section steel 26.

  Table 1 shows a comparison of specifications of the conventional example using the present invention and the hot metal detector HMD.

As shown in Table 1, by using the camera 22a which is a two-dimensional image sensor, it is possible to greatly increase the detection accuracy while greatly reducing the number of installed units.
As described later, the rotation detector (PLG) 25 described above may be used as a backup for the camera 22a.

[Stop position control device 23]
The stop position control device 23 determines the deceleration start position of the rolled H-section steel 26 based on the continuous measurement results of the measurement device 22, and the rolling H-section steel 26 after starting deceleration from the deceleration start position. This is a control device for stopping the rolled H-section steel 26 conveyed by the conveyance table 21 at the target stop position by correcting the speed.

  The stop position control device 23 calculates the deceleration start position of the rolled H-section steel 26 in advance according to the mass and dimensions of the rolled H-section steel 26, and the calculated value of the time required from when deceleration starts to when it stops. To be determined.

Hereinafter, an example of calculating the stop distance based on the material length will be specifically described.
The deceleration time T _β (second) of the rolled H-section steel 26 is obtained by T _β = {(GD _S ² + GD _A ² ) × N ² × 10 ⁻³ ) / (365 × P), and is determined by GD ² of the material. Change. However, GD _S ² is GD ² (Kg-m ² ) of the rolled H-shaped steel 26 that is a material, GD _A ² is GD ² (Kg-m ² ) of the motor, the table roller 24, etc., and N is The rotational speed (rpm), and P is the motor capacity (KW).

The GD ² of the rolled H-section steel 26 is determined by the unit weight, and the unit weight is determined by the length. Since the mass W (Kg) is determined by the steel type, by measuring the rolling schedule and the rolled material from the finish rolling mill, the single weight W ₁ (Kg / m) is calculated by the following equation (1). It is done. However, in Formula (1), W is material weight (Kg) and S is material length (m).

W ₁ = W / S (Kg / m) (1)
From the single weight W ₁ (Kg / m) determined by the equation (1), the GD ² of the rolled H-section steel 26 is GD _S ² = 365 × W ₁ × (V _T / n) ² (Kg-m ^2). ) However, _{V T} represents the conveying speed of the rolled H-beams 26 (m / s), n represents the rotation speed of the table rollers 24 (rpm).

The stopping distance L (m) is
L = V _T × T _β / 2 (m) (2)
Given by.

As described above, the stop distance L (m) can be obtained from the steel type information by calculation.
Next, an example of calculating the stop distance will be described. In this example, JISH400 × 400 is used, and the slab mass is 26100 kg. Deceleration time T _β (seconds) is
_Tβ = {(GD _S ² + GD _A ² ) × N ² × 10 ⁻³ } / (365 × P) (seconds)
^{_{However, GD S 2: GD 2 (}} Kg-m 2) of material, _GD ^{A 2:} motor, a ^GD 2 of table rollers ^{(60Kg-m 2).}

Here, assuming that the rotation speed N = 290 rpm and the motor capacity P = 30 kW,
The GD ² of the rolled H-section steel 26 is GD _S ² = 365 × W ₁ × (V _T / n) ² (Kg−m ² ). However, the conveyance speed V _T = 2 m / sec and the rotation speed n of the table roller 24 is 96 rpm.

Table 2 shows the length measurement result and deceleration time of the rolled H-section steel 26, and the GD ² calculation result of the rolled H-section steel 26.

As described above, since the stop distance L (m) is L = V _T × T _β / 2 (m), the stop distance L with respect to the length S of the rolled H-section steel 26 is as shown in Table 3 and FIG. It looks like a graph.

Since the relationship of L = 6 / S ^0.6 (m) is obtained from the graph of FIG. 3, control is performed using this relationship.
Further, the stop position control device 23 starts the deceleration of the rolled H-section steel 26 when the position of the tip in the transport direction of the rolled H-section steel 26 reaches the deceleration start position.

FIG. 4 is a graph showing the relationship between the speed of the rolled H-section steel conveyed and the distance from its tip to the stop target (stopper), that is, a deceleration pattern example of the rolled H-section steel according to the present invention.
As shown in the graph of FIG. 4, the conventional image sensor has been used to measure the position of the stopped object. In the present invention, the position of the rolled H-section steel 26 to be conveyed is two-dimensionally imaged by the camera 22a. Therefore, the position at the time of conveyance of the rolled H-section steel 26 that moves at high speed can be measured continuously (every 20 ms) with high accuracy (60 mm). For this reason, the speed command for the table roller 24 is corrected based on the deviation between the position of the rolled H-shaped steel 26 during deceleration and the target value, specifically, the rolling H-shaped by the stop position control device 23 in the present invention. For the speed of the steel 26, the deviation between the position of the tip of the rolled H-section steel 26 during deceleration and the position of this tip in a predetermined deceleration pattern is obtained, and the speed command for the table roller is corrected based on the obtained deviation. It became possible to control.

  For this reason, according to the present invention, the speed of the rolled H-section steel 26 can be precisely corrected based on the deviation between the actual position and the target position of the rolled H-section steel 26 during deceleration. In the graph, it becomes possible to make the speed of the rolled H-section steel conveyed coincide with the reference curve indicated by the solid line over the entire period from the start of deceleration to the stop of the rolled H-section steel 26. The fixed position stop system for the H-section steel 26 can be greatly improved.

  Further, the stop position control device 23 indicates the position of the rolled H-section steel 26, the two-dimensional image of the camera 22a that photographs the rolled H-section steel 26, and the output value of the rotation detector 25 of the motor of the table roller 21. , Specifically, the position of the rolled H-section steel 26 is measured using the image of the camera 22a when it is possible to photograph the rolled H-section steel 26 with the camera 22a. It is desirable to use the output value of the rotation detector 25 when it is impossible to photograph the rolled H-section steel 26 with the camera 22a. Disturbances such as the suspended load 28 of the traveling crane 27 may be reflected in the field of view of the camera 22a, making it impossible to measure the exact position of the rolled H-section steel 26. For this reason, the image of the camera 22a and the output value of the motor rotation detector (PLG) 25 are always input to the stop position control device 23, and it is impossible to photograph the rolled H-section steel 26 by the camera 22a. The output value of the motor rotation detector (PLG) 25 is used as a backup so that the tracking of the rolled H-section steel 26 can be continuously performed by instantaneously switching to the fixed position control using the output value of the PLG. It is desirable to use it.

[Cutting device]
The cutting device (not shown) is a cutting device for cutting the rolled H-section steel 26 that has been transported by the transport table 21 and stopped at a predetermined target stop position into a predetermined length, and is known as this type of cutting device. The use of a conventional hot saw is exemplified.

When the rolled H-section steel 26 is accurately stopped at a predetermined target stop position, the cutting device can be activated immediately to cut the long rolled H-section steel 26 to a desired length.
The manufacturing apparatus 20 according to the present invention is configured as described above. Next, the manufacturing method according to the present invention will be described.

  In FIG. 1, according to the manufacturing method of the present invention, a rolled H-section steel 26 conveyed by a conveyance table 21 having a plurality of table rollers 24 arranged in parallel is stopped at a target stop position, and then a predetermined length is obtained by a cutting device. The rolled H-section steel 26 is manufactured by cutting into two pieces.

  In the present invention, when the rolled H-section steel 26 to be conveyed is stopped, the position of the rolled H-section steel 26 is continuously measured by the measuring device 22 having the camera 22a, and the continuous measurement result of the measuring device 22 is obtained. Based on this, the deceleration start position of the rolled H-section steel 26 is determined, and the speed of the rolled H-section steel 26 after starting deceleration from the deceleration start position is feedback controlled based on continuous measurement results.

  For this reason, according to the present invention, the position during conveyance of the rolled H-section steel 26 that moves at a high speed can be measured continuously (every 20 ms) and with high accuracy (60 mm). The speed of the rolled H-section steel 26 can be precisely corrected based on the deviation between the actual position and the target position of the rolled H-section steel 26 in the middle, whereby the speed of the conveyed rolled H-section steel is changed to the rolled H-shape. It becomes possible to match the target speed as much as possible over the entire period from the start of deceleration to the stop of the steel 26 so that the fixed position stop system of the rolled H-section steel 26 can be greatly improved. Become.

In the present invention,
(A) Deceleration start position is determined based on the calculated value of the time required from the time of starting deceleration to the time of stopping obtained in advance according to the mass and dimension of rolled H-section steel 26, (b ) Deceleration of the rolled H-section steel 26 is started when the position of the tip in the conveying direction of the rolled H-section steel 26 reaches the deceleration start position, and (c) the speed of the rolled H-section steel 26 is changed to the rolled H-section. By obtaining a deviation between the position of the tip of the rolled H-section steel 26 during deceleration of the steel 26 and the position of the tip in a predetermined deceleration pattern, and correcting the speed command for the table roller 24 based on the obtained deviation, By performing at least one of the corrections, the accuracy of the stop position of the rolled H-section steel 26 can be further increased.

  In this way, according to the present invention, even if the mass, dimensions, shape, and the like of the rolled H-section steel 26 that is transported on the transport table 21 fluctuate, the rolled H-section steel 26 can be placed at the target stop position with high accuracy. Therefore, it is not necessary to finely adjust the stop position manually by the operator thereafter. For this reason, according to the present invention, it is possible to completely automate the fixed position stop control of the rolled H-section steel 26 for cutting with a hot saw in a large factory.

  50 rolled H-section steels (H400 × 200) were manufactured according to the present invention example and the conventional example described below, respectively, and the deviation of the stop position of the rolled H-section steel during the production of these rolled H-section steels was determined. .

(Example of the present invention)
As shown in FIG. 1, the position of the rolled H-section steel 26 (H400 × 200) conveyed by the conveyance table 21 having a plurality of table rollers 24 arranged in parallel is arranged as shown in FIG. Measurement is continuously performed using a two-dimensional image of the camera 22a that captures the H-section steel 26, and the deceleration start position of the rolled H-section steel 26 is determined based on the continuous measurement results, and deceleration is performed from the deceleration start position. The rolled H-section steel 26 is stopped at the target stop position by correcting the speed of the rolled H-section steel 26 after the start based on the continuous measurement result by the camera 22a, and then cut to a predetermined length. did.

(Conventional example)
The deceleration start position of the rolled H-section steel 26 is determined using the output value of the hot metal detector HMD instead of the continuous measurement result of the camera 22a in the above-described example of the present invention, and the continuous measurement result by the camera 22a is used. Instead, the output value of the rotation detector (PLG) 25 of the transport table 21 was used to feedback control the speed of the rolled H-section steel 26 after the start of deceleration.

  Table 4 shows stop position deviations of the present invention example and the conventional example, and FIG. 5 shows the elapsed time from the start of deceleration and the distance from the deceleration start position to the target stop position for each of the present invention example and the conventional example. Are shown by a graph.

  From Table 4 and FIG. 5, it can be seen that the stop position deviation was 700 mm in the conventional example, but 0 mm in the present invention example, and extremely high stop position accuracy can be obtained by the present invention.

DESCRIPTION OF SYMBOLS 1 Large factory manufacturing process 2 Heating furnace 3 Coarse rolling mills 4 and 6 Coarse universal rolling mill 5 Edger rolling mill 7 Finishing universal rolling mill 8 Transport table 9 First hot saw 10 Second hot saw 11 and 12 Rolled H-section steel 13 Hot metal detector HMD
14 Tip portion 15 Rolled H-section steel 16 Table roller 17 Table motor 18 Rotation detector (PLG)
20 Manufacturing device 21 Transport table 22 Measuring device 22a Camera 23 Stop position control device 24 Table roller 25 Rotation detector (PLG)
26 Rolled H-section steel 27 Crane 28 Suspended load

Claims (5)

It is a method for manufacturing a rolled shape steel, which is cut into a predetermined length after stopping the rolled shape steel conveyed by a conveyance table having a plurality of table rollers arranged side by side at a target stop position,
When stopping the rolled shape steel transported, the position of the rolled shape steel is continuously measured using a two-dimensional image of a camera that photographs the rolled shape steel, and based on the continuous measurement result. And determining the deceleration start position of the rolled shape steel, and the speed of the rolled shape steel after starting deceleration from the deceleration start position is the tip of the rolled shape steel during the deceleration as the continuous measurement result And a position of the tip in a predetermined deceleration pattern before the start of deceleration, and a correction is made based on the obtained deviation . The deceleration start position is determined based on a calculated value of a time required from a start of deceleration to a stop time, which is obtained in advance according to a mass and a dimension of the rolled shape steel. A method for producing a rolled steel described in 1. The method of manufacturing rolled steel according to claim 1 or 2, wherein the deceleration is started when a position of a tip in a conveyance direction of the rolled steel reaches the deceleration start position. The measurement of the position of the rolled shape steel is performed using an image of the camera at a time when the rolled shape steel can be photographed by the camera, and the rolling shape steel cannot be photographed by the camera. The method for manufacturing rolled steel according to any one of claims 1 to 3, wherein an output value of a rotation detector provided on the table roller is used at a time. A transport table having a plurality of table rollers arranged side by side;
A measuring device for continuously measuring the position of the rolled shape steel conveyed by the conveyance table using a two-dimensional image of a camera that images the rolled shape steel;
The deceleration start position of the rolled shape steel is determined based on the continuous measurement result of the measuring device, and the speed of the rolled shape steel after starting deceleration from the deceleration start position is determined by the continuous measurement result. By calculating the deviation between the position of the tip of the rolled shape steel during the deceleration and the position of the tip in a predetermined deceleration pattern before the start of deceleration, and correcting based on the obtained deviation , A stop position control device for stopping the rolled shape steel conveyed by the conveyance table at the target stop position;
An apparatus for producing a rolled shape steel, comprising: a cutting device for cutting the rolled shape steel stopped at the target stop position into a predetermined length.

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