Cutting device and cutting method for lap-welded corrugated plates

Abstract

The invention belongs to the technical field of corrugated plate cutting, and particularly relates to a lap-welded corrugated plate cutting device and a lap-welded corrugated plate cutting method. The device comprises three-dimensional laser cutting equipment, a corrugated plate cutting clamp and a special workbench. The corrugated plate cutting clamp comprises a corrugated pressing cross beam, a corrugated pressing base and an anti-splashing baffle, and profiling clamping of the corrugated plate after lap welding is achieved through a lifting device. The special workbench is provided with a metal slag recovery groove and a side face telescopic area, slag can be effectively collected, and the plates are prevented from deforming. Through the steps of cleaning, scribing, fixing, laser cutting and the like, high-precision laser path planning and accurate welding bead cutting, a single corrugated plate for training can be effectively recycled for at least three times. The industrial problem of efficient and high-quality cutting of the complex curved-surface thin-wall welded plate is solved, and the construction cost of an LNG ship is remarkably reduced.

Description

Technical Field

[0001] This invention belongs to the field of corrugated plate cutting technology, and particularly relates to a device and method for cutting corrugated plates after lap welding. Background Technology

[0002] LNG carriers employing the Mark III membrane-type cargo containment system technology rely on a core component: the main shield wall, constructed from 1.2 mm thick 304L stainless steel corrugated plates. The welding quality of these plates directly determines the sealing safety and reliability of the entire cargo containment system. To ensure welding quality on actual vessels, welders involved in the construction must pass a rigorous skills certification exam organized by the patent licensor, GTT. This necessitates extensive welding training before the exam. Traditional training involves trainees practicing lap welding on the edges of individual 1030mm × 135mm × 1.2mm corrugated plates, after which the entire plate is discarded due to the inability to effectively remove the weld beads. Statistics show that each welder consumes approximately 500 corrugated plates during the entire training period, resulting in material costs of approximately 100,000 yuan. This not only represents a significant waste of the valuable 304L stainless steel but also significantly increases the construction cost of LNG vessels. In other words, the stainless steel corrugated plates used in current welding training are discarded after a single use, leading to substantial waste.

[0003] Existing technologies for cutting corrugated sheets cannot utilize traditional methods like cold rolling and shearing, which are suitable for flat sheets, due to the complex three-dimensional corrugated shape of the finished product. Forced cutting easily results in deformation and burrs, and the heat-affected zone and spatter during the cutting process contaminate the back of the corrugated sheet, rendering it unsuitable for re-welding. Therefore, how to efficiently and effectively cut corrugated sheets after lap welding to enable their reuse has become a long-standing technical challenge in the industry. Current technologies lack specific cutting methods and equipment for this type of special-shaped, thin-walled welded sheet, hindering the recycling of materials.

[0004] Although laser cutting equipment exists, it is mostly used in the production of stainless steel corrugated sheets, and there are no specialized devices for stainless steel corrugated sheets, especially simple devices used in training sessions. Summary of the Invention

[0005] This invention addresses the problems of low cutting efficiency and quality, easy deformation and burrs, and contamination of the back of the corrugated sheet by heat-affected zone and spatter during cutting, which prevent it from meeting the requirements for re-welding, in existing corrugated sheet cutting devices and methods. This invention is specifically designed for 1.2 mm thick 304L stainless steel corrugated sheets. Unlike the applications of corrugated sheets made of other materials, this invention relates to the corrugated sheets used in the main wall layer of liquefied natural gas (LNG) carriers, which require extremely high processing quality and assembly precision, and must meet low-temperature requirements. This invention also provides a simple cutting device specifically for training in the welding stage of stainless steel corrugated sheets, thereby meeting training needs, reducing waste, and improving training efficiency and effectiveness.

[0006] To this end, the present invention proposes a corrugated plate cutting device after lap welding, comprising: a three-dimensional laser cutting device, a corrugated plate cutting fixture, and a special worktable; the corrugated plate cutting fixture is disposed on the special worktable; the three-dimensional laser cutting device is disposed on one side of the special worktable; The corrugated plate cutting fixture includes: a corrugated clamping beam, a corrugated clamping base, and a splash guard. The corrugated clamping base is fixedly installed on the table surface of a special workbench. The corrugated clamping crossbeam is raised and lowered by a lifting device set on the side of the special workbench, so as to cooperate with the corrugated clamping base to clamp or loosen the corrugated plate after lap welding. The bottom of the corrugated clamping beam is provided with a corrugated groove adapted to the corrugated plate after lap welding; the anti-splash baffle is vertically arranged on the corrugated clamping base. After the corrugated clamping beam and the corrugated clamping base clamp the corrugated plate after lap welding, the anti-splash baffle is located on the central axis in the corrugated groove. The dedicated workbench also includes a molten metal slag recovery tank and a side telescopic area. The molten metal slag recovery tank is located adjacent to the corrugated pressing base. The top of the molten metal slag recovery tank is provided with a cover plate. Laser cutting start and end points are engraved at both ends of the cover plate. The side telescopic area is connected to the dedicated workbench through a nested structure and can be horizontally extended and retracted to support the overhanging part of the corrugated plate after lap welding.

[0007] According to the above-described corrugated plate cutting device after lap welding, the corrugated groove at the bottom of the corrugated clamping beam and the corrugated contact surface of the corrugated plate after lap welding are continuous curved surfaces that conform to the corrugated shape of the corrugated plate after lap welding.

[0008] According to the above-described corrugated plate cutting device after lap welding, a slot is provided on the corrugated clamping base; the lower part of the anti-splash baffle is inserted into the slot, and the height of its exposed part is equal to the corrugation height of the corrugated plate after lap welding, dividing the trough of each corrugation into two independent cutting areas, preventing molten metal slag from splashing onto the opposite side of each independent cutting area of ​​the corrugated plate after lap welding during cutting.

[0009] According to the above-described corrugated plate cutting device after lap welding, the metal slag recovery tank is a tank-shaped structure with water inside, and its top cover has a strip-shaped opening. The strip-shaped opening is located directly below the laser cutting path and is used to receive and cool the metal slag and spatter generated during laser cutting.

[0010] According to the above-described corrugated plate cutting device after lap welding, the lifting device is a pneumatic lifting device, which is connected to an external compressed air source through an air circuit and controlled by an electric control valve to drive the lifting and lowering of the corrugated clamping beam. Its lifting height is greater than the height of the corrugated plate after lap welding, so as to ensure that the corrugated plate after lap welding can be smoothly put in and taken out.

[0011] According to the above-described corrugated plate cutting device after lap welding, the three-dimensional laser cutting equipment is composed of a six-axis industrial robot integrated with a laser cutting head. It presets the cutting path through a teaching programming control cabinet, and the cutting path coincides with the cutting line trajectory on both sides of the weld bead of the corrugated plate after lap welding.

[0012] According to the above-described corrugated plate cutting device after lap welding, the side telescopic area of ​​the special workbench is composed of multiple nested crossbeams. In the non-working state, it can be completely retracted into the main frame of the special workbench, and in the working state, it can be completely pulled out to provide additional support area.

[0013] According to the above-described corrugated plate cutting device after lap welding, the special workbench is provided with a side telescopic area pneumatic mechanism for driving the side telescopic area to extend and retract; the side telescopic area pneumatic mechanism is connected to the side telescopic area to drive the side telescopic area to extend and retract.

[0014] According to the above-described corrugated plate cutting device after lap welding, the corrugated plate cutting fixture and the special worktable can form multiple cutting stations, arranged around the three-dimensional laser cutting equipment, to achieve alternating feeding and cutting.

[0015] The method for cutting corrugated plates after lap welding using the above-described lap welding corrugated plate cutting device is characterized by comprising the following steps: Step S1: Clean the edges of the corrugated plate after lap welding. Use a deburring knife or sandpaper to clean the edges of the corrugated plate after lap welding. Step S2: Clean the weld bead of the corrugated plate after lap welding, and clean the 20mm area on both sides of the weld bead with alcohol or acetone. Step S3: Mark the entire corrugated plate after lap welding. Draw cutting lines above and below the weld bead on the entire plate. Draw cutting lines parallel to the weld bead at a distance of 5mm from the top and bottom of the weld bead. Step S4: Check and confirm the water level in the metal slag recovery tank on the dedicated workbench, ensuring that the water level is between 1 / 3 and 2 / 3 of the total height of the metal slag recovery tank; Step S5: Vertically install the anti-splash baffle on the corrugated clamping base of the corrugated plate cutting fixture on the dedicated workbench, and ensure that the anti-splash baffle extends beyond the cutting line on the dedicated workbench. Step S6: Extend the side telescopic area of ​​the special workbench to ensure that the entire corrugated plate is completely placed above the side telescopic area after the lap welding. Step S7: Start the lifting device of the corrugated plate cutting fixture on the special workbench to fully lift the corrugated clamping beam, ensuring that the lifting height of the corrugated clamping beam is greater than the corrugated height of the corrugated plate after lap welding. Step S8: Place the corrugated plate to be cut horizontally on the special workbench and the side telescopic area, and slowly push the corrugated plate after lap welding directly under the corrugated plate cutting fixture. Step S9: Align the cutting line of the corrugated plate after lap welding with the start and end points of laser cutting on the special workbench; Step S10: Operate the lifting device of the corrugated plate cutting fixture on the special workbench to lower the corrugated plate cutting fixture completely, so that the corrugated plate after lap welding is fixed on the special workbench. Step S11: Turn on the power of the 3D laser cutting equipment and preheat the laser cutting equipment for more than 25 minutes; Step S12: Adjust the position of the 3D laser cutting equipment directly above the corrugated plate after lap welding to ensure that the laser emitted by the 3D laser cutting equipment falls at the starting point of the laser cutting start and end point. Step S13: Start the three-dimensional laser cutting equipment and begin cutting the corrugated plate after lap welding along the cutting line; Step S14: The cutting is completed when the laser emitted by the 3D laser cutting equipment lands at the end point of the laser cutting start and end points, and the 3D laser cutting equipment stops running. Step S15: Activate the lifting device of the corrugated plate cutting fixture on the special workbench to fully lift the corrugated plate cutting fixture. Step S16: Repeat steps S9 to S15 above. By repeatedly pushing the corrugated plate after lap welding along the extension direction of the side extension area, the cutting lines are placed sequentially at the laser cutting start and end points on the special worktable. After fixing the corrugated plate after lap welding with the corrugated plate cutting clamp, the three-dimensional laser cutting equipment is started to cut sequentially along the subsequent cutting lines. Step S17: Turn off the power of the three-dimensional laser cutting equipment, fully retract the side telescopic area of ​​the special worktable, clean the metal slag recovery tank on the special worktable, and disassemble and clean the anti-splash baffle. Step S18: Keep the independent corrugated plate obtained after cutting, check whether there is a heat-affected zone on its back that needs to be treated, grind the burrs on the edges, and clean the cut welds. Step S19: Place the cut individual corrugated sheets into a wooden box and cover the surface of the cut corrugated sheets after lap welding with plastic film.

[0016] The beneficial effects of this invention are as follows: 1. Achieved high-quality cutting of complex curved thin plates. Existing technologies cannot effectively cut corrugated plates due to their complex shapes, thin walls, and susceptibility to deformation. This invention utilizes a corrugated plate cutting fixture, where the corrugated clamping beam and base apply force evenly across their matching curved surfaces, ensuring no deformation of the thin plate during clamping and providing a stable reference for laser cutting. Combined with a six-axis robotic laser device, the cutting head is always aligned with the normal direction of the curved surface, thus achieving high-precision, low-heat-affected cutting. The cut is smooth and burr-free, and the appearance and quality of the cut plate are close to that of a new product, directly meeting the stringent requirements for re-welding.

[0017] 2. Anti-spatter structure ensures the cleanliness of the welding surface of the reusable sheet metal. If molten slag from laser cutting adheres to the back of the corrugated sheet after lap welding, it will cause defects during re-welding. This invention's unique anti-spatter baffle structure physically separates each corrugated valley during cutting, forming an independent cutting chamber, effectively blocking lateral slag spatter. This structure solves the problem of cutting contamination at its source, ensuring the cleanliness of the welding area of ​​the corrugated sheet after cutting.

[0018] 3. Integrated structure enhances the stability and efficiency of cutting operations: This invention integrates functional modules such as clamps, worktables, slag treatment, and extension supports into one unit. The side extension area of ​​the dedicated worktable solves the problem of large-sized plates sagging due to overhang, ensuring stability throughout the cutting process. The slag recovery tank treats slag in real time through water cooling, improving the working environment. The pneumatic clamping method significantly improves clamping efficiency. The coordinated operation of the entire device makes cutting operations for complex workpieces simple, stable, and efficient, and easy to promote and apply on-site.

[0019] 4. Excellent scalability and adaptability. The device architecture of this invention is flexible, and one to three or even more cutting stations can be flexibly configured around the three-dimensional laser cutting equipment according to the amount of corrugated plate accumulated after lap welding. While the operator is clamping and positioning at one station, cutting is being carried out at another station, realizing assembly line operation and greatly improving equipment utilization and overall productivity. This modular expansion capability enables this invention to flexibly adapt to different production cycles and capacity requirements, and has wide applicability.

[0020] 5. This invention achieves the recycling of valuable materials, resulting in significant economic benefits. Compared to the existing technology's "one-time welding, entire plate scrapped" model, this invention successfully "recycles" corrugated plates after lap welding using a laser cutting method. Specifically, a standard-width lap-welded corrugated plate can be effectively cut and reused at least three times, extending the service life of a single lap-welded plate by more than 200%. This directly reduces the training material cost per welder from approximately 100,000 yuan to approximately 30,000 yuan, saving LNG shipbuilding companies huge production preparation costs and achieving the recycling of this valuable 304L stainless steel corrugated plate material.

[0021] Therefore, this invention has the advantages of simple structure, convenient use, and significant savings in training costs. Attached Figure Description

[0022] Figure 1 This is a perspective view of a structural schematic diagram of a corrugated plate cutting device after lap welding according to the present invention.

[0023] Figure 2 This is a front view of a structural schematic diagram of a corrugated plate cutting device after lap welding according to the present invention.

[0024] Figure 3 This is a left view of a structural schematic diagram of a corrugated plate cutting device after lap welding according to the present invention.

[0025] Figure 4 This is a top view of a structural schematic diagram of a corrugated plate cutting device after lap welding according to the present invention.

[0026] Figure 5 This is a schematic diagram of the corrugated plate cutting fixture structure of the corrugated plate cutting device after lap welding according to the present invention.

[0027] Figure 6 This is a schematic diagram showing the location of the metal slag recovery tank on the special workbench of the corrugated plate cutting device after lap welding according to the present invention.

[0028] Figure 7 This is a schematic diagram of the telescopic area on the side of the special workbench of the corrugated plate cutting device after lap welding according to the present invention.

[0029] Figure 8 This is a schematic diagram of the lifting device on the special workbench of the corrugated plate cutting device after lap welding according to the present invention.

[0030] Figure 9 This is a schematic diagram of the laser cutting start and end points on a dedicated workbench of a corrugated plate cutting device after lap welding, according to the present invention.

[0031] Figure 10 This is a schematic diagram of the marking of the entire corrugated plate after lap welding.

[0032] In the diagram: 1-3D laser cutting equipment, 2-cutting corrugated plate clamp, 3-dedicated worktable, 4-corrugated clamping beam, 5-corrugated clamping base, 6-anti-splash baffle, 7-metal slag recovery tank, 8-side telescopic area, 9-lifting device, 10-laser cutting start and end points, 41-corrugated groove. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] like Figures 1 to 9 As shown in this embodiment, a corrugated plate cutting device and cutting method after lap welding are used to efficiently and precisely cut 304L stainless steel corrugated plates with weld beads after LNG ship welder training, so that they can be reused for training, thereby significantly saving material costs.

[0035] The present invention provides a corrugated plate cutting device after lap welding, comprising a three-dimensional laser cutting device 1, a corrugated plate cutting fixture 2, and a special worktable 3.

[0036] In this embodiment, the 3D laser cutting equipment 1 is a six-axis industrial robot integrating a high-power laser cutting head, such as the Canopy RH14-10-W model. The cutting path is pre-input via a teach pendant programming control cabinet, and this path is completely consistent with the cutting lines QGX drawn on both sides of the weld bead HQ in subsequent steps. The six-axis robot provides sufficient degrees of freedom to flexibly adapt to the three-dimensional curved surface of the corrugated plate, ensuring that the laser beam is always perpendicular to the plate surface at the cutting point.

[0037] The dedicated workbench 3 is a three-dimensional frame structure made of high-strength steel to ensure stability. Its upper surface is used to mount the corrugated plate cutting fixture 2 and the molten metal slag recovery tank 7. The molten metal slag recovery tank 7 is a built-in trough-shaped water collection box, located adjacent to the corrugated plate cutting fixture 2. Its top is covered by a cover plate with a strip-shaped opening, the ends of which are precisely marked with the laser cutting start and end points 10. The hot molten slag and spatter generated during laser cutting fall through this strip-shaped opening into the water tank below, where they are instantly cooled and collected. This not only maintains a clean working environment but, more importantly, prevents spatter from contaminating the back of the corrugated plate, ensuring welding quality during reuse.

[0038] The dedicated workbench 3 is equipped with a side telescopic area 8. This side telescopic area 8 consists of multiple sliding and nested crossbeams. When processing large-sized corrugated plates after lap welding, it can be fully pulled out to form a complete, unsuspended support plane with the main table surface. This effectively prevents the thin-walled corrugated plates from sagging or shifting due to their own weight, thus affecting cutting accuracy. After the work is completed, it can be pushed back in, saving space.

[0039] The corrugated plate cutting fixture 2 is a specialized tooling designed specifically for fixing three-dimensional corrugated plates. It consists of a corrugated clamping beam 4, a corrugated clamping base 5, and a splash guard 6. The corrugated clamping beam 4 and the corrugated clamping base 5 are a pair of rigid components with specific curvatures, the curved shape of their working surfaces perfectly matching the corrugated shape of the 304L stainless steel corrugated plate to be cut. This ensures that during clamping, pressure is evenly applied to the crests and troughs of the corrugations, preventing excessive local stress that could cause deformation of the thin plate. The corrugated clamping base 5 is fixed to a dedicated workbench 3, while the corrugated clamping beam 4 is connected to a lifting device 9 installed on the side of the dedicated workbench 3. In this embodiment, the lifting device 9 is a cylinder controlled by an electrically controlled valve. External compressed air drives its piston rod to rise and fall, thereby causing the corrugated clamping beam 4 to complete the clamping and releasing actions. Its lifting height is higher than the corrugated plate after lap welding, ensuring that the corrugated plate can be smoothly placed in.

[0040] Anti-splash baffles 6 are positioned at the center of each corrugated valley of the corrugated clamping base 5 and are vertically installed through pre-set slots. After installation, the exposed portion of the anti-splash baffles 6 divides each corrugated valley in two. During laser cutting, these baffles effectively prevent molten metal slag from splashing onto the already cut or uncut corrugated areas, providing physical isolation and greatly ensuring the cleanliness of the back of the corrugated plate after cutting.

[0041] like Figure 10 As shown: The size of the corrugated plate after lap welding in this embodiment is 1030mm×770mm; it needs to be cut into 7 independent corrugated plates.

[0042] The method for cutting corrugated sheets after lap welding using the lap welding corrugated sheet cutting device in this embodiment is performed in the following steps: First, we need to do the preparatory work.

[0043] Clean the entire corrugated sheet with 6 parallel weld beads (HQ). Use a deburring tool or sandpaper to clean the edges, then thoroughly clean the area 20mm on both sides of each weld bead (HQ) with alcohol or acetone to ensure clear markings and cutting quality. After cleaning, mark the lines. Mark parallel cutting lines (QGX) 5mm above and below each weld bead (HQ), for a total of 12 cutting lines (QGX) for the 6 weld beads (HQ). Ensure that any substandard weld beads are completely removed while preserving as much good base material as possible.

[0044] Next, prepare the equipment and load the materials. Check the water level in the molten metal recovery tank 7, ensuring it is between 1 / 3 and 2 / 3 of the tank height. Then, insert the anti-splash baffle 6 into the corresponding slot of the corrugated clamping base 5. Next, pull out the side telescopic area 8 of the special worktable 3 and activate the lifting device 9 to raise the corrugated clamping beam 4. At this time, place the corrugated plate after lap welding smoothly on the main table surface of the special worktable 3 and the extended side telescopic area 8, and slowly push it in so that its cutting line is precisely aligned with the laser cutting start and end points 10 engraved on the special worktable 3.

[0045] Next, the cutting cycle begins. The pneumatic lifting device 9 is controlled to lower the corrugated clamping beam 4, which, along with the mating surface of the corrugated clamping base 5, firmly clamps the lap-welded corrugated plate. After clamping, the preheated three-dimensional laser cutting equipment 1 is started. The laser head travels along the preset cutting path, completing the cutting of the first independent corrugated plate. During this process, most of the slag and spatter generated are blocked by the anti-spatter baffle 6 and fall into the water in the slag recovery tank 7. After the single independent corrugated plate is cut, the equipment is paused, the corrugated clamping beam 4 is raised again, the lap-welded corrugated plate is pushed, and the next cutting line is moved and aligned with the laser cutting start and end point 10. The clamping and cutting process is repeated until all 12 cutting lines are cut.

[0046] Finally, the finishing work is carried out. After all cutting is completed, the power to the 3D laser cutting equipment 1 is turned off, the side telescopic zone 8 is pushed back, the slag in the slag recovery tank 7 is cleaned and the water is changed, and the anti-spatter baffle 6 is removed for cleaning. The 7 individually cut corrugated plates are removed from the worktable, and their heat-affected zones and edge burrs are inspected. If necessary, they are lightly sanded with sandpaper. Finally, these reusable corrugated plates are covered with plastic film, stacked in a special wooden box, and awaited use in the next welding training session.

[0047] Through this system and method, corrugated training boards that could originally only be used once can be effectively recycled at least three times, greatly improving material utilization and resulting in significant economic benefits.

[0048] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for cutting corrugated plates after lap welding, characterized in that, include: A three-dimensional laser cutting device (1), a corrugated plate cutting fixture (2), and a special worktable (3); the corrugated plate cutting fixture (2) is set on the special worktable (3); the three-dimensional laser cutting device (1) is set on one side of the special worktable (3); The corrugated plate cutting fixture (2) includes: a corrugated clamping beam (4), a corrugated clamping base (5), and a splash guard (6). The corrugated clamping base (5) is fixedly installed on the table surface of the special workbench (3). The corrugated clamping beam (4) is raised and lowered by a lifting device (9) set on the side of the special workbench (3), so as to cooperate with the corrugated clamping base (5) to clamp or loosen the corrugated plate after lap welding. The bottom of the corrugated clamping beam (4) is provided with a corrugated groove (41) adapted to the corrugated plate after lap welding; the anti-splash baffle (6) is vertically arranged on the corrugated clamping base (5); After the corrugated clamping beam (4) and the corrugated clamping base (5) clamp the corrugated plate after lap welding, the anti-splash baffle (6) is located on the central axis inside the corrugated groove (41); The special workbench (3) also includes a metal slag recovery tank (7) and a side telescopic area (8). The metal slag recovery tank (7) is located adjacent to the corrugated pressing base (5). The top of the metal slag recovery tank (7) is provided with a cover plate. Laser cutting start and end points (10) are engraved at both ends of the cover plate. The side telescopic area (8) is connected to the special workbench (3) through a nested structure and can be horizontally extended to support the overhang of the corrugated plate after lap welding.

2. The corrugated plate cutting device after lap welding according to claim 1, characterized in that, The corrugated groove (41) at the bottom of the corrugated clamping beam (4) and the corrugated contact surface of the corrugated plate after lap welding are continuous curved surfaces that are consistent with the corrugated shape of the corrugated plate after lap welding.

3. The corrugated plate cutting device after lap welding according to claim 2, characterized in that, The corrugated pressing base (5) is provided with a slot; the lower part of the anti-splash baffle (6) is inserted into the slot, and the height of its exposed part is equal to the corrugation height of the corrugated plate after lap welding, dividing the trough of each corrugation into two independent cutting areas, preventing molten metal slag from splashing onto the opposite side of each independent cutting area of ​​the corrugated plate after lap welding during cutting.

4. The corrugated plate cutting device after lap welding according to claim 3, characterized in that, The metal slag recovery tank (7) is a tank-shaped structure filled with water inside. Its top cover has a strip-shaped opening located directly below the laser cutting path, which is used to receive and cool the metal slag and splashes generated during laser cutting.

5. The corrugated plate cutting device after lap welding according to claim 4, characterized in that, The lifting device (9) is a pneumatic lifting device. It is connected to an external compressed air source through an air circuit and its on / off state is controlled by an electric control valve to drive the lifting and lowering of the corrugated pressing beam (4). Its lifting height is greater than the height of the corrugated plate after lap welding, so as to ensure that the corrugated plate after lap welding can be smoothly put in and taken out.

6. The corrugated plate cutting device after lap welding according to claim 5, characterized in that, The three-dimensional laser cutting equipment (1) is composed of a six-axis industrial robot integrated with a laser cutting head. It presets the cutting path through a teaching programming control cabinet. The cutting path coincides with the cutting line trajectory on both sides of the corrugated plate weld after lap welding.

7. The corrugated plate cutting device after lap welding according to claim 6, characterized in that, The side telescopic area (8) of the special workbench (3) is composed of multiple nested crossbeams. In the non-working state, it can be completely retracted into the main frame of the special workbench (3), and in the working state, it can be completely pulled out to provide additional support area.

8. The corrugated plate cutting device after lap welding according to claim 7, characterized in that, The dedicated workbench (3) is equipped with a side telescopic area pneumatic mechanism that drives the side telescopic area (8) to extend and retract; the side telescopic area pneumatic mechanism is connected to the side telescopic area (8) to drive the side telescopic area (8) to extend and retract.

9. The corrugated plate cutting device after lap welding according to claim 8, characterized in that, The cutting corrugated plate clamp (2) and the special workbench (3) can form multiple cutting stations, arranged around the three-dimensional laser cutting equipment (1) to achieve alternating feeding and cutting.

10. A cutting method using a corrugated plate cutting device after lap welding as described in any one of claims 1-9, characterized in that, Includes the following steps: Step S1: Clean the edges of the corrugated plate after lap welding. Use a deburring knife or sandpaper to clean the edges of the corrugated plate after lap welding. Step S2: Clean the weld bead of the corrugated plate after lap welding, and clean the 20mm area on both sides of the weld bead with alcohol or acetone. Step S3: Mark the entire corrugated plate after lap welding. Draw cutting lines above and below the weld bead on the entire plate. Draw cutting lines parallel to the weld bead at a distance of 5mm from the top and bottom of the weld bead. Step S4: Check and confirm the water level of the metal slag recovery tank (7) on the special workbench (3), and ensure that the water level is between 1 / 3 and 2 / 3 of the total height of the metal slag recovery tank (7); Step S5: Vertically install the anti-splash baffle (6) on the corrugated clamping base (5) of the cutting corrugated plate clamp (2) on the special workbench (3), and ensure that the anti-splash baffle (6) extends beyond the cutting line on the special workbench (3). Step S6: Extend the side telescopic area (8) of the special workbench (3) to ensure that the entire corrugated plate is completely placed above the side telescopic area (8) after the lap welding is completed. Step S7: Start the lifting device (9) of the corrugated plate cutting fixture (2) on the special workbench (3) to fully lift the corrugated clamping beam (4) and ensure that the lifting height of the corrugated clamping beam (4) is greater than the corrugated height of the corrugated plate after lap welding. Step S8: Place the corrugated plate to be cut horizontally on the special workbench (3) and the side telescopic area (8), and slowly push the corrugated plate after lap welding directly under the corrugated plate cutting fixture (2); Step S9: Align the cutting line of the corrugated plate after lap welding with the laser cutting start and end points (10) on the special worktable (3); Step S10: Operate the lifting device (9) of the corrugated plate cutting fixture (2) on the special workbench (3) to lower the corrugated plate cutting fixture (2) completely, so that the corrugated plate after lap welding is fixed on the special workbench (3). Step S11: Turn on the power of the three-dimensional laser cutting equipment (1) and preheat the laser cutting equipment for more than 25 minutes; Step S12: Adjust the position of the three-dimensional laser cutting equipment (1) directly above the corrugated plate after the lap welding to ensure that the laser emitted by the three-dimensional laser cutting equipment (1) falls on the starting point of the laser cutting start and end point (10); Step S13: Start the three-dimensional laser cutting equipment (1) and begin cutting the corrugated plate after lap welding along the cutting line; Step S14: The cutting is completed when the laser emitted by the three-dimensional laser cutting equipment (1) falls at the end point of the laser cutting start and end point (10), and the three-dimensional laser cutting equipment (1) stops running. Step S15: Activate the lifting device (9) of the corrugated plate cutting fixture (2) on the special workbench (3) to fully lift the corrugated plate cutting fixture (2); Step S16: Repeat steps S9 to S15 above. By repeatedly pushing the corrugated plate after lap welding along the extension direction of the side extension area (8), the cutting line is placed sequentially at the laser cutting start and end points (10) on the special worktable (3). After fixing the corrugated plate after lap welding with the corrugated plate cutting clamp (2), the three-dimensional laser cutting equipment (1) is started to cut sequentially along the subsequent cutting lines. Step S17: Turn off the power of the three-dimensional laser cutting equipment (1), completely retract the side extension area (8) of the special worktable (3), clean the metal slag recovery tank (7) on the special worktable (3), and disassemble and clean the anti-splash baffle (6). Step S18: Keep the independent corrugated plate obtained after cutting, check whether there is a heat-affected zone on its back that needs to be treated, grind the burrs on the edges, and clean the cut welds. Step S19: Place the cut individual corrugated sheets into a wooden box and cover the surface of the cut corrugated sheets after lap welding with plastic film.

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