JP7347403B2 - Cutting device and method for metal plates, and method for manufacturing product metal plates - Google Patents

Description

The present invention cuts the edge of a metal plate such as a thick steel plate in the longitudinal direction, and when cutting the metal plate into specified dimensions, simultaneously cuts the metal plate in the longitudinal direction. The present invention relates to a metal plate cutting device and a cutting method capable of cutting generated ear waste into a size that can be transported, and a method of manufacturing a product metal plate using this cutting device.

In the steel plate manufacturing process at a steel mill, in order to finish the rolled steel plate to the specified product steel plate dimensions, the steel plate is placed at a position a predetermined distance away from the width edge of both sides of the steel plate towards the center. Both longitudinal sides (both edges) of the thick steel plate are cut in the longitudinal direction of the thick steel plate. The part separated from the thick steel plate by this longitudinal cutting is called "ear scrap", and this ear scrap is reused as iron scrap. Gas cutting, laser cutting, or plasma cutting is used to cut thick steel plates in the longitudinal direction, and the cutting process itself is automated using a portal-type numerically controlled cutting machine or a self-propelled cutting machine. is progressing.

Gas cutting, laser cutting, plasma cutting, etc. are called "thermal cutting." Thermal cutting is a method of cutting by melting (or evaporating) the cut part and blowing off the melted (or evaporated) part with gas. On the other hand, a method of cutting using a blade (shear, scissors, saw, etc.) is called mechanical cutting. Thick steel plates have a long longitudinal length and a large thickness, and are difficult to cut by mechanical cutting, so thermal cutting is usually used.

The length of the product thick steel plate is 10 to 20 m long, and the shavings produced by cutting the thick steel plate in the longitudinal direction on both sides are also the same length as the product thick steel plate. Therefore, when transporting ear waste using a scrap chute or the like, it is necessary to cut it into pieces of size and weight that are easy to transport.

Conventionally, the means to cut the ear scraps generated by longitudinal cutting on both sides of a thick steel plate into pieces of size and weight that are easy to transport has not been automated, and the ear scraps are cut manually using hand torches and the like. Cutting is being carried out. Manual work not only increases the number of work steps, but is also a dangerous work in which there is a risk of injury to the worker due to scattering of molten slag during cutting.

In order to solve this problem, methods have been proposed in recent years to automatically cut ear waste into pieces of size and weight that are easy to transport.

For example, Patent Document 1 describes a process of longitudinal cutting in which a cutting torch is used to cut both longitudinal sides of a thick steel plate to a predetermined length in the longitudinal direction, and a cutting groove formed by this longitudinal cutting is cut from the width end of the thick steel plate. A method for disposing of ear scraps has been proposed in which cutting the ear scraps into pieces of predetermined length is performed repeatedly by cutting the ear scraps in the width direction.

Furthermore, Patent Document 2 discloses a longitudinal cutting machine having a large plate cutting nozzle for cutting both longitudinal edges of the thick steel plate along the scribed lines on a processing line that conveys the thick steel plate along its longitudinal direction. A waste material cutting nozzle is installed at a position slightly below the installation position of the longitudinal cutting machine and moves back and forth according to a certain cycle in a direction intersecting with the conveying direction of the thick steel plate, and is linked with the movement of the longitudinal cutting machine. A thick steel plate processing device equipped with a waste cutting machine has been proposed. In Patent Document 2, a thick steel plate is cut in the longitudinal direction using a large plate cutting torch (main cutting torch), and waste material (edge scraps) generated by the cutting is cut into a predetermined length using a waste material cutting torch (edge cutting torch). This is the technology.

JP2013-123738A Utility Model Publication No. 5-84466

However, the above conventional technology has the following problems.

That is, in Patent Document 1, the ear scraps are cut into small pieces by moving one cutting torch in the width direction of the thick steel plate or in the longitudinal direction of the thick steel plate, so the ear scraps are cut into small pieces. The problem arises that extra cutting time is required for this purpose, resulting in a longer cutting time. Furthermore, since the cutting does not proceed in one direction, there is also the problem that a misfire occurs and the cutting cannot proceed.

In Patent Document 2, the position of a waste material cutting torch (edge cutting torch) is set by an action piece attached to an operating rod, and the waste material is cut from a score line (cutting groove) of a thick steel plate toward the width end of the thick steel plate. Cutting waste wood (ear scraps) while moving the cutting tip (ear cutting torch). For this reason, the positional accuracy of the waste material cutting tip (edge cutting torch) on the score line (cutting groove) is low, and the waste material cutting tip (edge cutting torch) cannot be placed on the scoring line (cutting groove). This results in the preheating of waste material (slag), which causes problems such as scratches or adhesion of molten slag to the cut surface of the product thick steel plate after cutting the waste material (slag).

The present invention has been made in view of the above circumstances, and its purpose is to cut metal plates such as thick steel plates into specified dimensions by thermal cutting such as gas cutting or plasma cutting. In addition to the main cutting torch, which thermally cuts longitudinally at a predetermined distance from the width edge toward the center, a selvage torch is also installed to thermally cut shavings generated by longitudinal thermal cutting, and the To provide a metal plate cutting device and a cutting method capable of simultaneously cutting the metal plate in the longitudinal direction and cutting the lug of the metal plate into a size that can be transported without damaging the cut surface. Another object of the present invention is to provide a method for manufacturing a product metal plate using this cutting device.

The gist of the present invention for solving the above problems is as follows.

[1] The metal plate is thermally cut at a position away from the width end of the metal plate toward the center of the metal plate, and the metal plate is cut into a product metal plate and the ear scraps, and the ear scraps are thermally cut. A cutting device,
a main cutting torch that thermally cuts the metal plate in the longitudinal direction to form a cutting groove in the metal plate and cuts the metal plate into the product metal plate and the ear scraps;
an edge cutting torch that thermally cuts the edge waste from the width end side of the metal plate toward the cutting groove;
an ear cutting torch position detection sensor that detects the position of the ear cutting torch;
Edge cutting torch moving means for moving the edge cutting torch from the width end side of the metal plate toward the cutting groove;
A metal plate cutting device comprising:

[2] The metal plate cutting device according to [1] above, wherein the main cutting torch and the edge cutting torch are attached to the cart that moves in the longitudinal direction.

[3] The metal plate cutting device according to [1] or [2] above, wherein the main cutting torch and the edge cutting torch are any one of a gas cutting torch, a plasma cutting torch, and a laser cutting torch. .

[4] The selvage torch position detection sensor is a sensor that measures the distance between the width end of the metal plate and the selvage torch using light or sound waves, [1] to [3] above. The metal plate cutting device according to any one of the above.

[5] The metal plate cutting device according to any one of [1] to [4] above, further comprising a main cutting torch position detection sensor that detects the position of the main cutting torch.

[6] Using the metal plate cutting device according to any one of [1] to [5] above, move the main cutting torch in the longitudinal direction of the metal plate, or move the metal plate with respect to the main cutting torch. While moving the metal plate in the longitudinal direction and thermally cutting the metal plate in the longitudinal direction with the main cutting torch to cut the metal plate into product metal plates and ear scraps, the edge cutting torch position detection sensor cuts the edges. A method for cutting a metal plate, in which the edge cutting torch is moved from the width end side of the metal plate toward the cutting groove to thermally cut the edge scraps while detecting the position of the torch.

[7] Using the metal plate cutting device according to any one of [1] to [5] above, move the main cutting torch in the longitudinal direction of the metal plate, or move the metal plate with respect to the main cutting torch. While moving the metal plate in the longitudinal direction and thermally cutting the metal plate in the longitudinal direction with the main cutting torch to cut the metal plate into product metal plates and ear scraps, the edge cutting torch position detection sensor cuts the edges. While detecting the position of the torch, the edge cutting torch is moved from the width end side of the metal plate toward the cutting groove to thermally cut the edge scraps, thereby manufacturing a product metal plate from the metal plate. , a method for manufacturing a product metal plate.

According to the metal plate cutting device according to the present invention, by being equipped with two torches, the main cutting torch and the edge cutting torch, it is possible to cut the metal plate in the longitudinal direction and automatically cut the edge scraps into small pieces at the same time. This eliminates the need to manually cut ear waste into small pieces. In addition, since cutting the metal plate in the longitudinal direction and cutting the ear waste into small pieces are carried out at the same time, the overall cutting time is not extended due to the cutting time required to cut the ear waste into small pieces, and the ear waste can be cut efficiently. You can achieve small cuts. Furthermore, when cutting the ear scraps, the width end of the metal plate is preheated, and then the ear scrap is cut from the width end side of the metal plate toward the cutting groove of the longitudinal direction cutting. Compared to the method of preheating the cutting groove and then cutting the shavings from the cutting groove side toward the width end of the metal plate in the longitudinal direction, cutting is possible without damaging the cut surface of the product metal plate.

1 is a schematic perspective view of a cutting device that is an example of a metal plate cutting device according to an embodiment of the present invention. 1 is a schematic diagram of an example of a metal plate cutting device according to an embodiment of the present invention viewed from three directions. FIG. 2 is a schematic diagram of a method for automatically cutting ear waste into small pieces. It is a figure which shows the detection method of the cutting start point (edge cutting start point) of an edge cutting torch.

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

1 and 2 are schematic diagrams of an example of a metal plate cutting device according to an embodiment of the present invention. FIG. 1 is a perspective view of a metal plate cutting device. FIG. 2 is a schematic diagram of a metal plate cutting device viewed from three directions, and FIG. 2-(A) is a diagram (front view) of the cutting device viewed from a direction perpendicular to the direction of movement of the cutting device; Figure 2-(B) is a view (side view) of the cutting device viewed from a direction parallel to the direction of movement of the cutting device, and Figure 2-(C) is a view of the cutting device viewed from vertically above (plan view). ). The metal plate cutting apparatus according to the present invention is used, for example, in a steel plate refining process at a steel mill that manufactures product steel plates as product metal plates.

First, a metal plate cutting device according to an embodiment of the present invention will be described.

A metal plate cutting device 1 according to the present invention includes a main cutting torch 3, an edge cutting torch 4, and an edge cutting torch position detection sensor 6. The main cutting torch 3 includes a blowpipe 3a and a nozzle 3b, and the selvage torch 4 includes a blowpipe 4a and a nozzle 4b.

The main cutting torch 3 is attached to a main cutting torch base 7 via a main cutting torch support shaft 9, and the main cutting torch base 7 is fixedly installed on the cart 2. Similarly, the selvage torch 4 is attached to an selvage torch base 8 via an selvage torch support shaft 10, and this selvage torch base 8 is fixedly installed on the cart 2.

A rail (see FIG. 3, which will be described later) is installed on the thick steel plate 11 over the entire length of the thick steel plate 11 in the longitudinal direction. It is possible to move along.

The main cutting torch support shaft 9 is provided with a telescopic actuator (not shown) as a means for moving the main cutting torch, and similarly, the selvage torch support shaft 10 is provided with a telescoping actuator (not shown) as a means for moving the selvage torch. (not shown) is provided. As a result, the main cutting torch 3 and the edge cutting torch 4 are moved independently from the main cutting torch base 7 and the edge cutting torch base 8 to the width direction of the thick steel plate (metal plate) 11 with the trolley 2 as the base point. It is expandable and contractable. Note that the main cutting torch support shaft 9 does not necessarily need to be provided with a telescopic actuator, and the main cutting torch 3 may be fixed to the cart 2 and installed.

The edge cutting torch position detection sensor 6 is attached to the edge cutting torch 4, and is movable together with the edge cutting torch 4 in the width direction of the thick steel plate 11 relative to the trolley 2. The edge cutting torch position detection sensor 6 is a sensor that measures the distance between the width end portion 11a of the thick steel plate 11 and the edge cutting torch 4 using light or sound waves.

Assuming that the longitudinal direction of the thick steel plate 11 (carriage movement direction) is the x direction, the width direction of the thick steel plate 11 is the y direction, and the vertical direction of the thick steel plate 11 is the z direction, the y direction coordinate of the edge cutting torch position detection sensor 6 is: The coordinates are made to match the y-direction coordinates of the selvage torch 4. In this embodiment, the edge cutting torch position detection sensor 6 is, for example, a laser sensor, and measures the distance (distance in the y direction) between the width end 11a of the thick steel plate 11 and the edge cutting torch 4 using laser light. By doing so, the position (y-direction coordinate) of the selvage torch 4 is detected. In other words, the edge cutting torch position detection sensor 6 is an edge detection sensor. Here, the thick steel plate 11 is manufactured by hot rolling, and the width of the thick steel plate 11 is the width at the time of hot rolling, and is set larger than the width of the product thick steel plate (product metal plate) 12. There is.

In this embodiment, the main cutting torch 3 is also equipped with a main cutting torch position detection sensor 5. The x-direction coordinate of the main cutting torch position detection sensor 5 is made to match the x-direction coordinate of the main cutting torch 3. The main cutting torch position detection sensor 5 is, for example, a laser sensor, and measures the distance (distance in the x direction) between the longitudinal end 11b of the thick steel plate 11 and the main cutting torch 3 using laser light. It is configured to detect the position (x-direction coordinate) of the main cutting torch 3.

Note that the main cutting torch position detection sensor 5 does not necessarily need to be attached to the main cutting torch 3. Even if the main cutting torch position detection sensor 5 is not installed, by manually aligning the main cutting torch 3 when starting to cut the thick steel plate 11, the main cutting torch 3 can be adjusted longitudinally. It can be determined at the position (x-direction coordinate) of the direction end portion 11b.

The main cutting torch 3 and the edge cutting torch 4 shown in FIGS. 1 and 2 are gas cutting torches. A gas cutting torch is a gas cutting torch that uses preheating gas (propane gas, natural gas, etc.) to inject a preheating flame from the burners 3b and 4b at the tip of the torch to preheat the thick steel plate 11, and also to preheat the thick steel plate 11 that has been preheated. This is a torch that cuts a thick steel plate 11 by spraying a cutting oxygen stream. The horizontal cross-sectional structure of the crater 3b and the crater 4b is such that one nozzle that injects a cutting oxygen stream is arranged at the center, and a plurality of nozzles that inject a preheating gas are arranged around it.

The main cutting torch 3 is fixed at a predetermined position away from the width end portion 11a of the thick steel plate 11 toward the center of the thick steel plate 11. That is, the main cutting torch 3 has its y-direction coordinate fixed to a certain constant value with respect to the cart 2, and moves together with the cart 2 in the longitudinal direction (x direction) of the thick steel plate 11 to cut the thick steel plate 11. Thermal cutting is performed along the scored lines 14 drawn on the steel plate 11. By thermally cutting the thick steel plate 11 with the main cutting torch 3, a cutting groove 15 is formed in the thick steel plate 11, and the thick steel plate 11 is cut into a product thick steel plate (product metal plate) 12 and a selvedge 13.

The edge cutting torch 4 can be expanded and contracted in the width direction (y direction) of the thick steel plate 11 by a edge cutting torch support shaft 10 provided with an expansion and contraction actuator. By contracting the telescopic actuator, the edge cutting torch 4 thermally cuts the edge waste 13 from the width end side of the thick steel plate 11 toward the cutting groove 15 . In FIG. 1, the portion formed by thermal cutting with the edge cutting torch 4 is shown as a cutting groove 16. Since the edge cutting torch 4 also moves in the x direction together with the trolley 2 like the main cutting torch 3, the cutting groove 16 by the edge cutting torch 4 is formed in the thick steel plate 11 at an angle with respect to the x direction and the y direction. . The moving speed of the main cutting torch 3 and the edge cutting torch 4 is set, for example, in a range of 200 to 400 mm/min.

Note that the main cutting torch 3 and the edge cutting torch 4 are not limited to gas cutting torches, and may be plasma cutting torches or laser cutting torches. The plasma cutting torch is a torch that cuts the thick steel plate 11 by emitting plasma, and does not require preheating. Moreover, the laser cutting torch is a torch that cuts the thick steel plate 11 by irradiating it with a laser.

In addition, in the above explanation, the main cutting torch 3 and the edge cutting torch 4 attached to the cart 2 are moved together with the cart 2 relative to the thick steel plate 11 to thermally cut the thick steel plate 11, but the main cutting torch 3 and the edge cutting torch 4 are attached to a fixed base, and using a thick steel plate moving means (metal plate moving means), a thick steel plate (metal plate) 11 is attached to the main cutting torch 3 and the edge cutting torch 4 attached to the base. It is also possible to thermally cut the thick steel plate (metal plate) 11 by moving the cutting torch 4 in the longitudinal direction of the thick steel plate (metal plate) 11.

Here, the thick steel plate refers to a carbon steel plate and a low alloy steel plate having a thickness of 6 mm or more. In addition, the above explanation has been made using a thick steel plate as an example of a metal plate, but other than thick steel plates, metal plates include stainless steel plates, nickel-based metal plates, aluminum-based metal plates, copper-based metal plates, etc. It is also possible to perform thermal cutting by applying the present invention.

Next, a method for cutting a metal plate and a method for manufacturing a product metal plate according to the present invention will be explained.

A schematic diagram of the method for automatically cutting ear waste into small pieces is shown in FIG. The automatic ear waste cutting procedure is as follows.

Step 1: First, a score line 14 is drawn along the entire length of the surface of the thick steel plate 11 to serve as a cutting position. This scoring line 14 is determined based on the width dimension of the product thick steel plate 12. Then, the main cutting torch 3 is aligned. Specifically, the main cutting torch 3 is installed at a position separated from the width end 11a of the thick steel plate 11 by a predetermined distance at the longitudinal end 11b of the thick steel plate 11. That is, the main cutting torch 3 is installed at the position of the score line 14.

Step 2: Once the main cutting torch 3 is installed at a predetermined position, a preheating flame is blown out from the nozzle 3b of the main cutting torch 3 to preheat the cutting start surface of the longitudinal end portion 11b of the thick steel plate 11. After heating for a certain period of time, when the longitudinal end portion 11b of the thick steel plate 11 reaches a cutting start temperature (800° C. or higher in the case of a thick steel plate), the main cutting torch 3 cuts the thick steel plate 11 in the longitudinal direction. Specifically, the trolley 2 is run on the rails 17, and the main cutting torch 3 cuts the thick steel plate 11 while moving the main cutting torch 3 in the longitudinal direction with respect to the thick steel plate 11. Thereby, the thick steel plate 11 is cut into the product thick steel plate 12 and the ear scraps 13 (see FIG. 3-(1)).

Step 3: Simultaneously with the cutting by the main cutting torch 3 in step 2, the edge cutting torch 4 and the edge cutting torch position detection sensor 6 are moved to the width end of the thick steel plate 11 by the edge cutting torch support shaft 10 equipped with a telescopic actuator. The coordinates of the cutting start point (edge cutting start point) of the edge cutting torch 4 are detected by scanning in the direction (y direction) toward the section 11a (see FIG. 3-(1)).

FIG. 4 shows a method of detecting the cutting start point (edge cutting start point) of the edge cutting torch 4. First, the selvage torch position detection sensor 6 is caused to scan in the direction (y direction) from the scanning start position _y0 of the selvage torch position detection sensor 6 toward the width end portion 11a. At this time, the edge cutting torch position detection sensor 6 detects the distance _d1 between the thick steel plate 11 and the edge cutting torch position detection sensor 6. Furthermore, when the edge cutting torch position detection sensor 6 is scanned in the y direction, after passing the position of the width end 11a of the thick steel plate 11, that is, the position _y1 , the edge cutting torch position detection sensor 6 scans the floor surface 18. The distance _d2 between the edge cutting torch position detection sensor 6 and the edge cutting torch position detection sensor 6 is detected. The position y 1 at which the distance measurement value measured by _the selvage torch position detection sensor 6 changes from distance d ₁ to distance d ₂ is recorded as the cutting start point. In FIG. 4, reference numeral 19 is an installation stand on which a thick steel plate is placed.

Step 4: At the detected coordinates of the cutting starting surface, a preheating flame is blown out from the tip 4b of the edge cutting torch 4 to preheat the cutting starting surface (see FIG. 3-(2)). After heating for a certain period of time and when the width end portion 11a of the thick steel plate 11 reaches the cutting start temperature (800° C. or higher in the case of a thick steel plate), a cutting oxygen stream is blown from the tip 4b of the edge cutting torch 4 to cut the edge scraps 13. Start cutting. The preheating time using the preheating flame is, for example, about 10 seconds.

Step 5: While continuing cutting with the main cutting torch 3, the edge cutting torch 4 is directed from the width end portion 11a side toward the cutting groove 15 by the main cutting torch 3 using the edge cutting torch support shaft 10 equipped with a telescopic actuator. and move it to cut the eardust 13 (see FIG. 3-(3)).

Step 6: When the edge cutting torch 4 reaches the same y-axis coordinate as the main cutting torch 3, that is, when it reaches the cutting groove 15, stop blowing the cutting oxygen stream from the edge cutting torch 4, The cutting of the ear scraps 13 is completed (see FIG. 3-(4)).

Step 7: After the trolley 2 has traveled a certain distance in the x direction, it returns to step 1 and cuts the ear shavings 13 repeatedly. When the longitudinal cutting of the thick steel plate 11 by the main cutting torch 3 is completed, the thick steel plate 11 is cut into product thick steel plates 12 and shavings 13.

As explained above, according to the metal plate cutting device 1 according to the present invention, by providing two torches, the main cutting torch 3 and the edge cutting torch 4, At the same time as the cutting, the ear waste 13 can be automatically cut into small pieces, and the manual cutting of the ear waste 13 into small pieces becomes unnecessary.

Furthermore, since the longitudinal cutting of the thick steel plate (metal plate) 11 and the cutting of the ear scraps 13 are carried out at the same time, the overall cutting time is not extended by the cutting time for cutting the ear scraps 13 into small pieces. , it is possible to efficiently cut ear waste 13 into small pieces.

In addition, when cutting the ear scraps 13, the position of the ear cutting torch 4 is detected by the ear cutting torch position detection sensor 6, so that the ear scraps 13 on the width end 11a of the thick steel plate (metal plate) 11 and on the cutting groove 15 are The positional accuracy of the cutting torch 4 can be improved. Thereby, the cutting precision of the ear scraps 13 by the ear cutting torch 4 can be improved, and the ear scraps 13 can be cut without damaging the cut surface of the product thick steel plate (product metal plate) 12.

Furthermore, when cutting the lug 13, the width end 11a of the thick steel plate (metal plate) 11 is preheated, and then the lug is cut from the width end 11a side of the thick steel plate (metal plate) 11 in the direction of the cutting groove 15. Since the scrap 13 is cut, that is, preheating is not performed on the cutting groove 15 for longitudinal cutting, the thick steel plate (metal plate) is cut from the cutting groove 15 side for longitudinal cutting after preheating the cutting groove 15 for longitudinal cutting. Compared to the method of cutting the ear scraps toward the width end portion 11a of the product thick steel plate (product metal plate) 12, the cut surface of the product thick steel plate (product metal plate) 12 can be cut without damaging it.

1 Cutting device 2 Cart 3 Main cutting torch 3a Blowpipe 3b Tinder 4 Ear cutting torch 4a Blowpipe 4b Tinder 5 Main cutting torch position detection sensor 6 Ear cutting torch position detection sensor 7 Main cutting torch base 8 Ear cutting torch base 9 Main cutting Torch support shaft 10 Edge cutting torch support shaft 11 Thick steel plate (metal plate)
11a Width end 11b Longitudinal end 12 Product thick steel plate (product metal plate)
13 Ear scraps 14 Scoring lines 15 Grooves cut by main cutting torch 16 Grooves cut by edge cutting torch 17 Rail 18 Floor surface 19 Installation stand

Claims (7)

A metal plate cutting device that thermally cuts the metal plate at a position away from the width end of the metal plate toward the center of the metal plate to cut the metal plate into a product metal plate and the metal plate while thermally cutting the metal plate. There it is,
a main cutting torch that thermally cuts the metal plate in the longitudinal direction to form a cutting groove in the metal plate and cuts the metal plate into the product metal plate and the ear scraps;
an edge cutting torch that thermally cuts the edge waste from the width end side of the metal plate toward the cutting groove;
an ear cutting torch position detection sensor that detects the position of the ear cutting torch;
Edge cutting torch moving means for moving the edge cutting torch from the width end side of the metal plate toward the cutting groove;
A metal plate cutting device comprising: The metal plate cutting device according to claim 1, wherein the main cutting torch and the edge cutting torch are attached to the cart that moves in the longitudinal direction. The metal plate cutting apparatus according to claim 1 or 2, wherein the main cutting torch and the edge cutting torch are any one of a gas cutting torch, a plasma cutting torch, and a laser cutting torch. The selvage torch position detection sensor is a sensor that measures the distance between the width end of the metal plate and the selvage torch using light or sound waves. The metal plate cutting device described. The metal plate cutting device according to any one of claims 1 to 4, further comprising a main cutting torch position detection sensor that detects the position of the main cutting torch. Using the metal plate cutting apparatus according to any one of claims 1 to 5, the main cutting torch is moved in the longitudinal direction of the metal plate, or the metal plate is moved relative to the main cutting torch. While moving the main cutting torch in the longitudinal direction and thermally cutting the metal plate in the longitudinal direction to separate the metal plate into a product metal plate and ear scraps, the position of the edge cutting torch is determined by the edge cutting torch position detection sensor. A method for cutting a metal plate, in which the edge cutting torch is moved from the width end side of the metal plate toward the cutting groove to thermally cut the edge waste while detecting the edge scrap. Using the metal plate cutting apparatus according to any one of claims 1 to 5, the main cutting torch is moved in the longitudinal direction of the metal plate, or the metal plate is moved relative to the main cutting torch. While moving the main cutting torch in the longitudinal direction and thermally cutting the metal plate in the longitudinal direction to separate the metal plate into a product metal plate and ear scraps, the position of the edge cutting torch is determined by the edge cutting torch position detection sensor. The product metal is manufactured by thermally cutting the selvage by moving the selvage torch from the width end side of the metal plate toward the direction of the cutting groove while detecting the shavings, thereby producing a product metal plate from the metal plate. Method of manufacturing the board.

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