JP2008105071A - Method and device for cutting thick steel plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for cutting a thick steel plate for performing the cutting work on a conveying line for connecting a rolling line to a shearing line or on a separate line. <P>SOLUTION: In a thick steel plate manufacturing line having a rolling line and a shearing line, and having a cutting device on a conveying line for conveying a thick steel plate after the rolling from the rolling line to the shearing line or on a separate line, the thick steel plate having the thickness which cannot be sheared by a shearing machine of the shearing line is cut to a predetermined dimension by the cutting device. The cutting device comprises a width distance meter using a non-contact type distance meter for cutting the thick steel plate in a conveying mode taking into consideration the dimension and the arrangement on the line of the thick steel plate, and a gas plasma or laser cutting machine which is movable in the XY direction of the line. Two sets of gas plasma or laser cutting machines are provided so as to cut the thick steel plate simultaneously in the longitudinal direction with the desired width. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and apparatus for cutting a thick steel plate, and more particularly to a material for cutting a thick steel plate that cannot be cut by a shearing device.

  Patent Document 1 relates to a method of manufacturing a thick steel plate. When a thick steel plate that cannot be sheared by an on-line shearing machine (a steel plate whose shear load exceeds the shearing functional force) is cut to a predetermined size, the conveyance line is once taken offline. It is described that a steel plate is placed on a dedicated pedestal and cut by a gas cutting machine or a laser cutting machine.

  In the case of the above-mentioned method, (1) The work efficiency is low due to the large number of crane handling due to the off-line wholesale from the transfer line and the steel plate placement on the dedicated gantry, and the steel plate is scratched during handling. Likely to happen.

  (2) Since a predetermined product is cut and collected, work efficiency is low because it is necessary for a person to make a rule or store a cutting path in gas or laser cutting. (3) After the completion of cutting, problems such as the need to pay out with a crane again from the gantry were pointed out.

  Several proposals have been made to improve the working efficiency of the gas cutting operation. Patent Document 2 relates to a gas cutting method for a steel plate, and when a steel plate placed on a mounting table is gas cut along a planned cutting line, the shape of the steel plate and the position on the mounting table are detected by a planar shape recognition device. It is described that a cutting line is determined and gas cutting is performed.

Patent Document 3 relates to a method for efficiently collecting a product of a predetermined size from a thick steel plate using an automatic gas cutting machine equipped with a plurality of torches, and performing a plurality of cuttings at the same time by setting the plurality to three or more. Thus, it is described that work efficiency is improved and quality deterioration due to thermal deformation is prevented.
JP-A 64-56619 JP-A-1-95887 JP-A-4-231175

  However, as described above, taking a thick steel plate off-line from the conveying line and performing gas cutting causes various problems. Also, by the gas cutting methods described in Patent Documents 2 and 3, Since the cutting operation is performed by moving the gas cutting torch in the stopped state, the delay in carrying in to the next process due to offline is not recovered.

  Therefore, the present invention provides a method for cutting a thick steel plate that improves the cutting work efficiency of the thick steel plate by cutting on the transport line the steel plate that has been sheared in excess of the shearing functional force arranged online and could not be cut online. And an object to provide an apparatus.

The object of the present invention can be achieved by the following means.
1. This is a cutting method that has a rolling line and a shear line, and cuts the thick steel sheet to a predetermined dimension in a thick steel sheet production line having a cutting device on a conveying line that conveys the rolled thick steel sheet from the rolling line to the shearing line. A thick steel plate having a thickness that cannot be sheared by a shearing machine in the shear line is cut into a predetermined size by the cutting device.
2. The cutting device is a non-contact type distance meter that measures the distance to the thick steel plate that is transporting the transport line at a position opposite to the left and right of the transport line on the upstream side of the cutting machine and the cutting machine, above the transport line Comprising a measuring device having a length meter for measuring the length of the thick steel plate from
The non-contact distance meter is disposed as a pair at opposing positions across the conveyance line, and at least three pairs are disposed in the conveyance direction so that the total length of the thick steel plate can be measured at at least three locations,
The distance meter and the length meter arranged in at least three pairs are arranged so that the shape of the thick steel plate and the mounting state on the conveying line can be measured before cutting the thick steel plate with a cutting machine,
When cutting a thick steel plate that is being transported from the rolling line to the transport line and is being transported, the width information and the mounting state on the transport line (rotation, oblique) are obtained from the distance information obtained by the at least three pairs of non-contact distance meters. Line), stop the conveyance, first cut in the C direction at the position where the product can be sampled from the tip of the thick steel plate, then start the conveyance, while conveying, the product dimension width L The method for cutting a thick steel plate according to 1, wherein the cutting is performed in the direction, and finally, the conveyance is stopped, and the product is cut in the C direction at a position where the product can be collected at the rear end of the thick steel plate.
3. A cutting apparatus for a thick steel plate, which is installed in a conveying line connecting a rolling line and a shearing line, and includes the following apparatuses.

(1) A measuring device that measures the planar shape (width, bend), skew amount, and rotation of a steel plate being conveyed on the conveying line. (2) Width direction arranged on the downstream side of the measuring device described in (1) Gas plasma or laser cutting machine (3) Steel plate length measuring device (4) Chip treatment device (5) Noro removal (position perpendicular to the conveyance line center) and longitudinal direction (conveyance line center direction) A cutting method for a thick steel plate, characterized in that, in the apparatus 4.1 or 2, the cutting apparatus is installed on a line provided separately from the conveying line.
The thick steel plate cutting device according to 5.3, wherein the cutting device is installed in a line provided separately from the conveying line.

  According to the present invention, a planar shape measuring device, a gas plasma or laser cutting machine capable of position control in the width direction, and a device for processing cutting waste are arranged on a steel sheet conveying line, and a steel plate that cannot be cut online (shearing) The cutting work efficiency is improved because it is possible to cut a steel sheet whose load exceeds the shearing function force on the conveying line. Moreover, the following effects can be obtained.

  (1) Handling with a crane can be reduced and handling scratches can be prevented.

  (2) Since the skew and rotation of the steel sheet being cut are grasped in real time from a plurality of width gauge measurement results, and the position of the cutting torch is controlled, cutting can be performed with high accuracy.

  (3) Since the cutting torch is configured to be position-controllable in the longitudinal direction, the longitudinal cutting of the steel plate placed obliquely from the advancing direction on the transport line can be performed with high accuracy. A perpendicularity can be secured.

  (4) When the measuring device is configured to scan and measure from both sides of the steel plate in the plate thickness direction, the cross-sectional profile can also be grasped.

  (5) Therefore, it is possible to collect a product from a non-defective part even when the difference in elongation due to rolling occurs in the upper and lower surfaces of the steel sheet or in the central part of the thickness and the cross section is oblique, concave or convex. I can do it.

  The present invention obtains the shape of a thick steel plate being transported on a transport line or a line provided separately from the transport line, and the mounting status of rotation, skew, etc. on any of these lines. It cut | disconnects to a predetermined dimension with the cutting device arrange | positioned above. Hereinafter, the line in which the cutting device is arranged will be described as a conveyance line.

  FIG. 1 is a diagram for explaining an example of the configuration of a cutting device installed on a conveying line in the cutting method according to the present invention. In the figure, 1 is a cutting device, 2 is a pedestal, 3 is a measuring device, 4 is a conveying roller, 5 Is a thick steel plate (shown by dotted lines), 7 is a slot removing device, 8 is a chip disposal device, 9 is a chip box, 10 is a chip, 21 is a cutting torch, 31, 32 and 33 are distance meters, and 34 is a length meter. Indicates.

  The cutting means of the cutting device 1 is composed of a cutting torch 21 and a gantry 2 to which the cutting torch 21 is attached. The cutting torch 21 has two pieces so that a thick steel plate can be cut simultaneously with the cutting lines on the left and right of the product width.

  Each cutting torch 21 is attached to the gantry 2 so as to be movable in a line center direction (L direction) of the transfer line and a direction (C direction) perpendicular to the line center. The cutting method is preferably gas plasma cutting or laser cutting.

  On the upstream side of the cutting torch 21, a measuring device 3 having distance meters 31, 32, 33 and a length meter 34 is arranged at a position facing the left and right of the transport line.

  The distance meters 31, 32, and 33 measure distances from the respective installation positions to the thick steel plate 5, and are arranged as a pair at opposing positions across the conveyance line, and the total length of the thick steel plate 5 is at least at three locations. At least three pairs are arranged in the transport direction so that measurement can be performed.

  With this arrangement, it is possible to obtain the shape of the thick steel plate 5 and the mounting state (rotation, skew) of the thick steel plate 5 from the distance information of the distance meters 31, 32, 33.

  When the distance meter 31, 32, 33 is configured to scan and measure from both sides of the thick steel plate 5 in the plate thickness direction, the cross-sectional profile can also be grasped, by rolling on the upper and lower surfaces of the thick steel plate or the central portion of the thickness. Even when the difference in elongation occurs and the cross section is oblique, concave or convex, the product can be collected from the non-defective part.

  In the present invention, the distance meters 31, 32, 33 are non-contact distance meters so that the shape of the thick steel plate 5 can be measured while the thick steel plate 5 is being conveyed on the conveying roller 4.

  A length meter 34 for measuring the length of the thick steel plate 5 is installed above the transport roller 4. The length gauge 34 may be either a contact type or a non-contact type.

  The distance meters 31, 32, 33 and the length meter 34 can measure the shape of the thick steel plate 5 and the mounting state on the conveying roller 4 before cutting the thick steel plate 5 with the cutting torch 21. It suffices if it is arranged upstream, and is not specifically defined in the present invention. FIG. 2 shows a schematic perspective external view of the cutting apparatus 1 described above.

  In the transport line, a noro removal device 7 is arranged on the upstream side of the cutting device 1, and removes the noro before cutting. The chips 10 from the cutting torch 21 are put into the chip box 9 by the chip processing device 8.

  In addition, when cutting a thick steel plate with the cutting torch 21, if the thick steel plate is moved, skewing or the like may occur, and the measurement result may not be reflected. Therefore, the cutting torch 21 is moved. Therefore, the cutting torch 21 is movably attached to the gantry 2 as described above.

  In addition, it is preferable that the cutting is started when the tail end of the steel plate is detected by the pair of distance meters arranged last, because the cutting accuracy is improved. When it is determined that productivity is reduced when the cutting device is provided on the transport line, the cutting device is installed on a line provided separately from the transport line.

Next, the cutting procedure of the cutting method according to the present invention will be described with reference to FIGS. 4A, 4B, 4C, and 4D in the case where the product 6 is cut out from the thick steel plate 5. FIG. In addition, in FIG. 4, the arrow shows the conveyance direction (L direction) of a thick steel plate.
(1) While transporting the thick steel plate 5, the width is measured by the distance meters 31, 32, 33 at three locations in the longitudinal direction. A cutting line a at the tip, which is a position where the product can be collected from the tip of the thick steel plate 5, is determined (FIG. 4 (a)).
(2) The cutting line a at the tip is aligned with the position of the cutting torch 21, the conveyance of the thick steel plate 5 is stopped, and the cutting torch 21 is moved in the C direction to cut the cutting line a (FIG. 4B).
(3) Next, the cutting line b which becomes the width of the product 6 is determined. The cutting torch 21 is moved to the position of the cutting line b, and the width cutting is performed while moving the cutting torch 21. At this time, grasping the rotation and skew, which is the mounting state on the conveying line of the thick steel plate 5 from the width measurement position information measured by the distance meters 31, 32, 33 at three positions in the longitudinal direction of the thick steel plate 5, The cutting position is corrected timely (FIG. 4C).
(4) Finally, the cutting line c from which the product 6 can be collected at the rear end of the thick steel plate 5 is aligned with the position of the cutting torch 21, the thick steel plate 5 is stopped, and the product 6 is cut by the cutting line c. Is obtained (FIG. 4D).
FIG. 3 is a flowchart showing the cutting procedure described above.

An example in which a product 6 having a product thickness of 70 mm, a product width of 3000 mm, and a product length of 7000 mm is cut and extracted from the rolled steel plate 5 shown in FIG.
1) During the conveyance of the steel plate 5 to the cutting device, the width shape is measured by a plurality of distance meters 31, 32, 33 installed in the conveyance line, and the product 6 can be collected at l ₂ : 154 mm from the tip of the steel plate 5 Judgment.
2) The product 6 determined in 1) is transported so that the sampling position is below the cutting machine, and the steel plate 5 is stopped.
3) When the steel plate 5 stops, the angle difference θ between the center C ₂ of the product 6 to be collected and the conveyance line center C ₁ is calculated from the measurement results of the plurality of width gauges 31, 32, 33, and the inclination is 2 °. It was determined.
4) Start cutting in the width direction from both sides of the steel plate 5 with two cutting torches (not shown in FIG. 5). Cutting was performed while correcting the position of the longitudinal position 34.9 mm / width 1 m for tilt correction. Width cutting time 7 min.
5) Tip cutting waste treatment. Time required 1 min
6) Set two cutting torches at a cutting start position with a spacing W of 3010 mm (= cutting width).
7) The conveyance of the steel plate 5 is started. Conveying speed is 240 mm / min.
8) Cutting is performed while correcting the position of the width direction position 34.9 mm / length conveyance 1 m for inclination correction. There is no rotation of the steel plate this time. Cutting time 30 min.
9) Length conveyance distance l ₁ : The conveyance stops when it reaches 7015 mm.
10) Cutting waste disposal. Required time 1 min.
11) Start cutting in the width direction. Cutting was performed while correcting the position of the longitudinal position 34.9 mm / width 1 m for tilt correction. Width cutting time 7 min.
12) Product delivery. Cutting scraps after paying out.
When cut by the above procedure, the time required from the start of cutting the tip to the delivery of the product was 46 min.

The figure explaining an example of a structure of the cutting device installed in a conveyance line in the cutting method which concerns on this invention. The typical perspective appearance figure of the cutting device shown in FIG. The figure which shows the cutting procedure of the cutting method which concerns on this invention. It is a figure explaining the cutting | disconnection procedure of the cutting method which concerns on this invention, (a) is the measurement condition of a width length (b) is the cutting condition of the front-end | tip part width direction (c) is the cutting condition of a longitudinal direction (d) is back The figure explaining the cutting condition of an edge part width direction. Example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting device 2 Base 3 Measuring device 4 Conveying roller 5 Thick steel plate (illustrated with dotted line)
6 Product 7 Noro removal device 8 Chip disposal device 9 Chip box 10 Chip 21 Cutting torch 31, 32, 33 Distance meter 34 Length meter

Claims (5)

  This is a cutting method that has a rolling line and a shear line, and cuts the thick steel sheet to a predetermined dimension in a thick steel sheet production line having a cutting device on a conveying line that conveys the rolled thick steel sheet from the rolling line to the shearing line. A thick steel plate having a thickness that cannot be sheared by a shearing machine in the shear line is cut into a predetermined size by the cutting device. The cutting device is a non-contact type distance meter that measures the distance to the thick steel plate that is transporting the transport line at a position opposite to the left and right of the transport line on the upstream side of the cutting machine and the cutting machine, above the transport line Comprising a measuring device having a length meter for measuring the length of the thick steel plate from
The non-contact distance meter is disposed as a pair at opposing positions across the conveyance line, and at least three pairs are disposed in the conveyance direction so that the total length of the thick steel plate can be measured at at least three locations,
The distance meter and the length meter arranged in at least three pairs are arranged so that the shape of the thick steel plate and the mounting state on the conveying line can be measured before cutting the thick steel plate with a cutting machine,
When cutting a thick steel plate that is being transported from the rolling line to the transport line and is being transported, the width information and the mounting state on the transport line (rotation, oblique) are obtained from the distance information obtained by the at least three pairs of non-contact distance meters. Line), stop the conveyance, first cut in the C direction at the position where the product can be sampled from the tip of the thick steel plate, then start the conveyance, while conveying, the product dimension width L The method for cutting a thick steel plate according to claim 1, characterized in that the cutting is performed in the direction, and finally, the conveyance is stopped and the product is cut in the C direction at a position where the product can be collected at the rear end of the thick steel plate. A cutting apparatus for a thick steel plate, which is installed in a conveying line connecting a rolling line and a shearing line, and includes the following apparatuses.
(1) A measuring device that measures the planar shape (width, bend), skew amount, and rotation of a steel plate being conveyed on the conveying line. (2) Width direction arranged on the downstream side of the measuring device described in (1) Gas plasma or laser cutting machine (3) Steel plate length measuring device (4) Chip treatment device (5) Slot removal (position perpendicular to the transfer line center) and longitudinal direction (transfer line center direction) apparatus   The method for cutting a thick steel plate according to claim 1 or 2, wherein the cutting device is installed on a line provided separately from the conveying line.   The thick steel plate cutting device according to claim 3, wherein the cutting device is installed in a line provided separately from the conveying line.

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