Box structure welding method

Abstract

The present invention discloses a box-type structure welding method, comprising: providing two target plates, each having a width margin added to the lofted and expanded dimensions; bending the two target plates to obtain two bent plates; cutting the weld edges of the two bent plates to allow for a uniform weld gap between the weld edges of the two bent plates to obtain two welded plates; and pair-welding the two welded plates to obtain a box-type structure. The present invention utilizes the reserved width margin to offset errors in the cutting, bending, and pair-welding processes, and sequentially performs rough and fine cutting, thereby improving the welding accuracy and quality stability of the box-type structure.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to a box-type structure welding method. Background Art

[0002] In engineering machinery structures, such as the box-type boom of engineering cranes, two plates are bent and welded together. However, the current process is subject to many constraints, and the accuracy of incoming materials and bending performance are uncontrollable, which leads to a series of problems in the root welding process, such as low assembly accuracy and poor consistency. In the existing welding assembly process of box-type structures, manual spot welding is required one by one along the direction of the welding gap. At locations with smaller gaps, the spot fixation is manually pried open, and the root welding needs to be ground before welding. At locations with larger gaps, manual swinging is required during the root welding, and even edging, grinding, and repair welding are required, resulting in poor processing accuracy, complex processes, and unstable quality. Summary of the Invention

[0003] The main purpose of the present invention is to provide a box-type structure welding method, aiming to solve the technical problems of low box-type structure welding precision and unstable quality in the prior art.

[0004] In order to achieve the above object, the present invention provides a box-type structure welding method, which comprises:

[0005] Two target plates are provided, wherein the target plates have a width margin added to the lofted and expanded size;

[0006] performing a bending operation on the two target plates to obtain two bent plates;

[0007] Performing a width margin cutting operation on the welding edges of the two bent plates to make the welding gaps between the welding edges of the two bent plates consistent, thereby obtaining two welded plates;

[0008] The two welding plates are butt-welded to obtain a box-type structure.

[0009] In an embodiment of the present invention, the bent plate includes a middle section divided along the width direction and bending sections located on both sides of the middle section. The welding edge is arranged at one end of the bending section away from the middle section. During the bending operation, the width margin is distributed in the two bending sections.

[0010] In an embodiment of the present invention, before performing the width allowance cutting operation on the welded edges of the two bent plates, the method further includes:

[0011] Adsorbing one of the bent plates by an external adsorption mechanism, and fixing the bent plate with its opening facing upward in a preliminary assembly position as a lower bent plate;

[0012] The outer adsorption mechanism adsorbs another bent plate with its opening facing downward as an upper bent plate, and moves the upper bent plate until the welding edge of the upper bent plate abuts against the welding edge of the lower bent plate.

[0013] In an embodiment of the present invention, before adsorbing another bent plate with its opening facing downward as an upper bent plate by the external adsorption mechanism, the method further comprises:

[0014] The inner wall of the lower bent plate is supported outwardly by an inner supporting mechanism located in the lower bent plate, and the lower bent plate is clamped and fixed inside and outside by an external pressing mechanism arranged in alignment with the inner supporting mechanism;

[0015] After the welding edge of the upper bent plate and the welding edge of the lower bent plate are abutted, the method further includes:

[0016] The inner wall of the upper bent plate is supported outwardly by an inner supporting mechanism located in the upper bent plate, and the upper bent plate is clamped and fixed inside and outside by an external pressing mechanism arranged in correspondence with the inner supporting mechanism.

[0017] In an embodiment of the present invention, the step of pair-welding the two welding plates comprises:

[0018] Adjusting the external adsorption mechanism, the internal support mechanism, and the external pressure mechanism to close the two welded plates;

[0019] A laser welding head is used to perform laser welding on the two welding plates, and the inner support mechanism and the outer pressure mechanism are controlled to move with the laser welding head at a welding speed and in a welding direction to clamp and fix the two welding plates.

[0020] In an embodiment of the present invention, the method of adsorbing one of the bent plates by an external adsorption mechanism and fixing the bent plate with its opening facing upward in a preliminary assembly position as a lower bent plate includes:

[0021] Transporting the bent sheet with the opening facing upward to a welding station below a gantry with a laser cutting head;

[0022] Adjust the bent plate so that the center line of both ends of the bent plate in the length direction corresponds to the track of the gantry;

[0023] The external adsorption mechanism is controlled to adsorb and fix the bent plate as a lower bent plate.

[0024] In an embodiment of the present invention, the operation of cutting the width allowance of the welding edges of the two bent plates includes:

[0025] Based on the welding gap between the two bent plates, the welding edges of the two bent plates are respectively cut to allow for width margin.

[0026] In an embodiment of the present invention, the operation of performing width margin cutting on the welding edges of the two bent plates based on the welding gap between the two bent plates comprises:

[0027] A laser cutting head is used to cut the two bent plates, and the cutting straight lines of the first and last sections during the cutting process are parallel to the center line of the box-shaped structure.

[0028] In an embodiment of the present invention, the cutting width of the welding edge is less than half of the width margin.

[0029] In an embodiment of the present invention, providing two target plates includes:

[0030] Determine the initial cutting parameters based on the lofted expansion size and width allowance;

[0031] The initial plate is cut according to the preliminary cutting parameters to obtain the two target plates.

[0032] Through the above technical solution, the box-type structure welding method provided by the embodiment of the present invention has the following beneficial effects:

[0033] The box-type structure welding method provided in the embodiment of the present application has a target plate with a width margin added on the basis of the lofted and unfolded size, and is precisely cut in conjunction with the width margin cutting operation after bending. On the one hand, it can offset the errors caused by the bending operation, etc. On the other hand, it can ensure that the welding gap between the two bent plates is more uniform, thereby effectively eliminating the errors caused by subsequent group welding operations, further ensuring welding accuracy and welding consistency.

[0034] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 1 is a schematic flow chart of a box-type structure welding method according to one embodiment of the present invention;

[0037] Figure 2is a structural schematic diagram of a welding system according to another embodiment of the present invention;

[0038] Figure 3 FIG. 1 is a partial structural diagram of a welding system according to another embodiment of the present invention.

[0039] Description of Reference Numerals

[0040] Label Name Label Name

[0041] 100 Welding system 221a upper mounting frame

[0042] 1 Welding device 221b Lower mounting frame

[0043] 11 Gantry 222 elastic pressing component

[0044] 111 X-axis arm 2221 elastic buffer

[0045] 112 Y-axis arm 2222 follower roller

[0046] 113 welding space 223 drive components

[0047] 12 Joint Action Mechanism 2231 Chain

[0048] 121 Laser welding head 2232 Chain tensioner

[0049] 122 Bevel grinding head 2232a Upper chain tensioner

[0050] 123 Laser cutting head 2232b Lower chain tensioner

[0051] 124 Weld Seam Tracking Sensor 2233 Chain Seat

[0052] 2 Positioning and clamping device 23 External pressure mechanism

[0053] 21 External adsorption mechanism 200 box structure

[0054] 211 Magnetic suction machine 210 Bending plate

[0055] 22 Internal support mechanism 220 Welding gap

[0056] 221 Mounting Bracket DETAILED DESCRIPTION

[0057] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0058] The box-type structure welding method according to the present invention will be described below with reference to the accompanying drawings.

[0059] like Figure 1 As shown, in an embodiment of the present invention, a box-type structure welding method is provided, wherein the box-type structure welding method includes:

[0060] Step S10, providing two target plates, wherein the target plates have a width margin added to the lofted and unfolded dimensions;

[0061] Step S20, performing a bending operation on the two target plates to obtain two bent plates 210;

[0062] Step S30, performing a width margin cutting operation on the welding edges of the two bent plates 210 to make the welding gaps between the welding edges of the two bent plates 210 consistent, thereby obtaining two welded plates;

[0063] In step S40 , two welding plates are butt-welded to obtain a box-type structure 200 .

[0064] In the embodiment of the present application, the target plate is increased with a width margin on the basis of the lofted and unfolded size, and the width margin cutting operation after bending is combined with precision cutting. On the one hand, it can offset the errors caused by the bending operation, etc. On the other hand, it can ensure that the welding gap between the two bent plates is more uniform, thereby effectively eliminating the errors caused by the subsequent group welding operation, further ensuring welding accuracy and welding consistency.

[0065] In one embodiment, the width margin is related to the cutting process accuracy, the bending process accuracy, and the assembly and welding process accuracy.

[0066] This embodiment combines the cutting process accuracy, the bending process accuracy, and the group welding process accuracy to reserve a margin, so that the target plate has a corresponding process margin after the preliminary cutting, which can offset the assembly gap caused by the subsequent bending operation, the width margin cutting operation, and the group welding operation errors. In addition, the width margin cutting operation after bending is combined with precision cutting to ensure that the welding gap 220 between the two bent plates 210 is more uniform in the vertical direction. At the same time, the cutting width of the welding edge is less than half of the width margin, which can eliminate the errors caused by the subsequent group welding operation, further ensuring welding accuracy and welding consistency. In this embodiment, the target plate is given a preliminary width margin by combining the cutting process accuracy, the bending process accuracy, and the group welding process accuracy, and precision cutting is performed after the bending operation. The width margin reservation can offset the cutting process error, the bending process error, and the group welding process error. The rough cutting and fine cutting performed in succession provide conditions for precise welding, thereby improving the welding accuracy and quality stability of the box-type structure 200.

[0067] Specifically, two target plates are provided:

[0068] Determine the initial cutting parameters based on the lofted expansion size and width allowance;

[0069] The initial plate is cut according to the preliminary cutting parameters to obtain two target plates.

[0070] The lofted expansion size can be w, and the width margin can be 4×g. g can be pre-set according to the specific cutting process accuracy, bending process accuracy and group welding process accuracy. It can be understood that the initial cutting parameter is w+4×g to cut the target plate, so that the width of the two target plates is w+4×g, providing cutting, bending and welding margins for the two target plates. The higher the cutting process accuracy, bending process accuracy and group welding process accuracy, the lower the g value. The g value is between 2mm and 8mm, and is usually 7mm or 8mm. The length direction is Figure 3 The front-to-back direction is shown in Figure 2 Left-right direction shown in .

[0071] In one embodiment, the bent sheet 210 includes a middle section divided along the width direction and two bent sections located on either side of the middle section. The welding edge is provided at the end of the bent section away from the middle section. During the bending operation, the width margin is distributed between the two bent sections. In this embodiment, 4g is distributed between the two bent sections, so that the total width margin of the two bent sections of a bent sheet 210 is 4g. This ensures the accuracy of the middle section and facilitates the subsequent width margin cutting operation, improving both welding quality and operational convenience.

[0072] In another embodiment, Figure 2 and Figure 3 As shown, the welding system 100 is used to weld a box-type structure 200. The welding system 100 includes a mobile welding device 1 and a positioning clamping device 2. The mobile welding device 1 can move along the length direction of the plate for welding. The positioning clamping device 2 includes an external adsorption mechanism 21, an internal support mechanism 22 and an external pressure mechanism 23. The internal support mechanism 22 and the external pressure mechanism 23 can move along the length direction of the plate with the mobile welding device 1. The external adsorption mechanism 21 can adopt a structural form of fixed adsorption relative to the plate and does not move with the weld.

[0073] Specifically, the internal support mechanism 22 includes a mounting frame 221, an elastic pressing assembly 222, and a driving assembly 223. The mounting frame 221 is provided with elastic pressing assemblies 222 at both ends along the width direction of the plate, which are elastically pressed against the inner wall of the bent plate 210. The driving assembly 223 is used to drive the mounting frame 221 to move along the length direction of the plate. In this embodiment, the internal support mechanism 22 adopts an elastic extrusion method, so that the internal support mechanism 22 can be adjusted in real time during the welding process, thereby ensuring the consistency of the welding gap 220. Figure 2 As shown, elastic pressing components 222 are provided at both ends of the mounting frame 221 in the left and right directions. The elastic pressing components 222 at both ends can laterally support the bent plate 210 internally.

[0074] The elastic pressing assembly 222 includes a follower roller 2222 and an elastic buffer 2221 connected between the mounting frame 221 and the follower roller 2222. The elastic buffer 2221 in this embodiment is a spring or other flexible buffer structure. In this embodiment, the follower roller 2222 and the elastic buffer 2221 cooperate to enable the follower roller 2222 to roll, thereby improving the assembly convenience of the internal support mechanism 22 and the driving convenience of the drive assembly 223.

[0075] The two mounting frames 221 are connected to each other. The internal support mechanism 22 includes two drive assemblies 223 arranged on both sides of the box structure 200 along the length direction of the plate. The drive assembly 223 includes a chain 2231 and a chain tensioner 2232 for tightening or loosening the chain 2231. The chain tensioner 2232 is connected to the mounting frame 221 through the chain 2231. Figure 3 As shown, drive assemblies 223 are provided on both the front and rear sides of the box-shaped structure 200. Chain tensioners 2232 can tension or release chains 2231, thereby driving the two mounting frames 221 forward or backward in a synchronized manner. In this embodiment, the mounting frames 221 of the internal support mechanism 22 are interconnected, allowing the two mounting frames 221 to offset the reaction force of the elastic pressure assembly 222, thereby smoothing the movement of the internal support mechanism 22. Furthermore, the chain tensioning or releasing drive mechanism provides a simple structure and facilitates assembly and control.

[0076] The two mounting frames 221 are an upper mounting frame 221a and a lower mounting frame 221b, respectively. The chain tensioners 2232 corresponding to the upper mounting frame 221a and the lower mounting frame 221b are respectively an upper chain tensioner 2232a and a lower chain tensioner 2232b. The drive assembly 223 also includes two chain seats 2233 disposed opposite each other in the width direction of the box-shaped structure 200. The upper chain tensioner 2232a and the lower chain tensioner 2232b are both mounted on the chain seats 2233. In this embodiment, the upper and lower chain tensioners 2232b on the front and rear sides are integrated through the chain seats 2233, which can improve the installation convenience and structural compactness of the internal support mechanism 22.

[0077] A plurality of elastic pressing components 222 are arranged at intervals along the length direction of the plate and installed on the mounting frame 221. Figure 3 As shown, in this embodiment, the mounting frame 221 is provided with two elastic pressing components 222 along the front-to-back direction. In other embodiments, the elastic pressing components 222 can be provided according to specific usage requirements, and the present invention is not limited thereto.

[0078] The mobile welding device 1 may include a gantry 11 and an articulated mechanism 12 mounted on the gantry 11. The articulated mechanism 12 is movable relative to the gantry 11 along the length of the plate. A laser welding head 121, a groove grinding head 122, and a laser cutting head 123 are disposed at the lower end of the articulated mechanism 12. The articulated mechanism 12 may utilize an existing industrial robot, dedicated machine, or the like, and accurately deliver the end effector to the desired position. The laser welding head 121 may utilize an existing laser welding head, and the groove grinding head may utilize an existing grinding head. Laser cutting utilizes a non-contact laser beam, is unaffected by the magnetic field on the fixture, and minimizes deformation caused by cutting. The laser welding head 121 may utilize a laser welding head, allowing for higher efficiency, lower heat input, and less deformation during subsequent laser welding. In this embodiment, the laser welding head 121, groove grinding head 122, and laser cutting head 123 are integrated through the articulated mechanism 12, facilitating operational control of cutting, welding, and groove processing, while also providing a more integrated structure.

[0079] Specifically, a weld tracking sensor 124 electrically connected to the internal support mechanism 22 and the external pressure mechanism 23 may be provided at the lower end of the joint action mechanism 12. The weld tracking sensor 124 in this embodiment may be a welding gap visual tracking sensor in the prior art. The weld tracking sensor 124 can identify and detect weld gap information and transmit the weld gap information to the internal support mechanism 22 and the external pressure mechanism 23, so that the internal support mechanism 22 and the external pressure mechanism 23 move synchronously with the mobile welding device 1 according to the weld gap information.

[0080] In this embodiment of the present invention, the gantry 11 includes two X-axis arms 111 that can move along the length of the plate, and a Y-axis arm 112 connected between the two X-axis arms 111 and capable of movement perpendicular to the length of the plate. The joint mechanism 12 is mounted on the Y-axis arm 112 and can translate on the Y-axis arm 112. In this embodiment, the X-axis arms 111, Y-axis arm 112, and joint mechanism 12 cooperate to enable the mobile welding apparatus 1 to cover two welding gaps 220. The X-axis 111 and Y-axis arm 112 enclose a welding space 113 that can accommodate the box-shaped structure 200.

[0081] The external adsorption mechanism 21 may include at least two magnetic adsorption machines 211 arranged at intervals and used for magnetically adsorbing the bent plate 210. Figure 2 As shown, in this embodiment, the upper and lower bent plates 210 are each provided with an external adsorption mechanism 21. The magnetic attraction machine 211 of the external adsorption mechanism 21 is provided with an electromagnet in the prior art. By energizing, the magnetic attraction machine 211 can be made to magnetically attract the bent plate 210. The external pressure mechanism 23 can be pressed against the outer surface of the bent plate 210 by a motor-driven screw rod. The external pressure mechanism 23 can be driven by a gear in the prior art to move synchronously with the mobile welding device 1. Before performing the width margin cutting operation on the welded edges of the two bent plates 210, the method further includes:

[0082] The external adsorption mechanism 21 is used to adsorb one of the bent plates 210 and fix the bent plate with its opening facing upward in the preliminary assembly position as the lower bent plate;

[0083] The outer adsorption mechanism 21 adsorbs another bent plate with its opening facing downward as an upper bent plate, and moves the upper bent plate until the welding edge of the upper bent plate abuts against the welding edge of the lower bent plate.

[0084] In this embodiment, the upper and lower bending plates are preliminarily assembled and positioned by first preliminarily fixing the lower bending plate, then adsorbing and fixing the upper bending plate, and finally driving the upper bending plate to move toward the lower bending plate until the welding edges abut, thereby providing a corresponding welding gap 220 for the subsequent width allowance cutting operation, thereby facilitating the subsequent width allowance cutting operation.

[0085] In one embodiment, the width margin cutting operation on the welding edges of the two bent plates 210 includes:

[0086] Using the weld gap 220 between the upper and lower bent sheets as a reference, width allowance cutting is performed on the weld edges of the upper and lower bent sheets, starting from the centerline of the weld gap 220. This width allowance cutting in this embodiment is performed after initial assembly, providing a reference for precision cutting. Cutting can be performed along the maximum gap toward the longitudinal protrusion, facilitating the cutting operation while also improving cutting accuracy.

[0087] Specifically, based on the welding gap between the two bent plates 210, the width margin cutting operation of the welding edges of the two bent plates 210 includes:

[0088] The two bent sheets 210 are cut using a laser cutting head 123, with the leading and trailing cutting lines parallel to the centerline of the box-shaped structure 200. The laser cutting head 123 is used to cut the upper and lower bent sheets perpendicularly, with the leading and trailing cutting lines parallel to the centerline of the box-shaped structure 200.

[0089] This embodiment utilizes laser cutting, a non-contact cutting method utilizing a light beam. This method is unaffected by the magnetic field of the fixture, minimizing deformation caused by cutting and improving cutting quality. Furthermore, the cutting lines at the beginning and end of the cutting process are parallel to the centerline of the box-shaped structure 200, improving the uniformity of the weld gap 220 in the vertical direction.

[0090] In one embodiment, before the outer adsorption mechanism 21 adsorbs another bent plate 210 with its opening facing downward as the upper bent plate, the method further includes:

[0091] The inner support mechanism 22 located in the lower bent plate is used to support the inner wall of the lower bent plate outward, and the external pressure mechanism 23 arranged in alignment with the inner support mechanism 22 is used to clamp and fix the lower bent plate inside and outside;

[0092] After the welding edge of the upper bent plate and the welding edge of the lower bent plate are abutted, the method further includes:

[0093] The inner wall of the upper bending plate is supported outward by the inner support mechanism 22 located in the upper bending plate, and the upper bending plate is clamped and fixed inside and outside in cooperation with the external pressure mechanism 23 arranged in opposition to the inner support mechanism 22. In this embodiment, after the lower bending plate is initially fixed, the lower bending plate can be further precisely positioned, fixed and clamped by the inner support mechanism 22 and the external pressure mechanism 23, thereby improving the stability and positioning accuracy of the lower bending plate. In addition, the manual operation link is replaced, greatly improving the automation and intelligence of the operation. The initial adsorption and fixation of the lower bending plate, the precise positioning and clamping of the lower bending plate, the initial adsorption and fixation of the upper bending plate, the alignment of the upper and lower bending plates, and the high-precision positioning and clamping of the lower bending plate can be performed in sequence, which can ensure the accuracy of the initial assembly of the lower bending plate and the upper bending plate, and improve the accuracy and stability of the initial assembly while facilitating the subsequent width margin cutting operation.

[0094] In yet another embodiment, pair welding two welding plates comprises:

[0095] Adjust the external adsorption mechanism 21, the internal support mechanism 22 and the external pressure mechanism 23 to close the two welded plates;

[0096] The laser welding head 121 is used to perform laser welding on the two welding plates, and the internal support mechanism 22 and the external pressure mechanism 23 are controlled to clamp and fix the two welding plates according to the welding speed and welding direction along with the laser welding head 121.

[0097] In this embodiment, the internal support mechanism 22 and external pressure mechanism 23 move with the movement of the weld point, thereby preventing weld failures due to weld wave deformation. The internal support mechanism 22 and external pressure mechanism 23 always remain close to the weld gap 220. Furthermore, the combination of laser cutting and laser welding in this embodiment further improves weld quality.

[0098] In one embodiment, the outer adsorption mechanism 21 is used to adsorb one of the bent plates 210 and fix the bent plate 210 in a preliminary assembly position with the opening facing upward. The lower bent plate includes:

[0099] The bent sheet 210 is transported with the opening facing upward to the welding station below the gantry 11 with the laser cutting head 123;

[0100] Adjust the bent plate 210 so that the center line of the two ends of the bent plate 210 in the length direction corresponds to the track of the gantry 11;

[0101] The external adsorption mechanism 21 is controlled to adsorb and fix the bent plate 210 as a lower bent plate.

[0102] In the present embodiment, during the preliminary fixation of the lower bent plate, the bent plate 210 can be transported first, and the position of the bent plate 210 can be precisely adjusted so that the center lines at both ends of the length direction of the bent plate 210 correspond to the tracks of the gantry 11, thereby facilitating the subsequent cutting operation of the bent plate 210 by the laser cutting head 123 on the gantry 11, while avoiding welding errors caused by skewness.

[0103] In another embodiment, before pair welding the two welding plates, the method includes:

[0104] The welding edges of the welding plates are subjected to groove grinding. In this embodiment, in order to improve the convenience of welding operation, the welding edges of the welding plates can be groove ground before the assembly welding, thereby facilitating the subsequent solder filling and welding.

[0105] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0106] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0107] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0108] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A box-type structure welding method, characterized in that: The box-type structure welding method comprises: Two target plates are provided, wherein the target plates have a width margin added to the lofted and expanded size; performing a bending operation on the two target plates to obtain two bent plates; The welding edges of the two bent plates are brought into contact with each other, and based on the welding gap between the two bent plates, the welding edges of the two bent plates are respectively cut to allow for a certain amount of width, so that the welding gaps between the welding edges of the two bent plates are consistent, thereby obtaining two welded plates; The two welding plates are butt-welded to obtain a box-type structure.

2. The box-type structure welding method according to claim 1, characterized in that: The bent plate includes a middle section divided along the width direction and bending sections located on both sides of the middle section. The welding edge is arranged at one end of the bending section away from the middle section. During the bending operation, the width margin is distributed in the two bending sections.

3. The box-type structure welding method according to claim 2, characterized in that: Before performing the width margin cutting operation on the welding edges of the two bent plates, the method further includes: Adsorbing one of the bent plates by an external adsorption mechanism, and fixing the bent plate with its opening facing upward in a preliminary assembly position as a lower bent plate; The outer adsorption mechanism adsorbs another bent plate with its opening facing downward as an upper bent plate, and moves the upper bent plate until the welding edge of the upper bent plate abuts against the welding edge of the lower bent plate.

4. The box-type structure welding method according to claim 3, characterized in that: Before the outer adsorption mechanism adsorbs another bent plate with its opening facing downward as an upper bent plate, the method further comprises: The inner wall of the lower bent plate is supported outwardly by an inner supporting mechanism located in the lower bent plate, and the lower bent plate is clamped and fixed inside and outside by an external pressing mechanism arranged in alignment with the inner supporting mechanism; After the welding edge of the upper bent plate and the welding edge of the lower bent plate are abutted, the method further includes: The inner wall of the upper bent plate is supported outwardly by an inner supporting mechanism located in the upper bent plate, and the upper bent plate is clamped and fixed inside and outside by an external pressing mechanism arranged in correspondence with the inner supporting mechanism.

5. The box-type structure welding method according to claim 4, characterized in that: The pair welding of the two welding plates comprises: Adjusting the external adsorption mechanism, the internal support mechanism, and the external pressure mechanism to close the two welded plates; A laser welding head is used to perform laser welding on the two welding plates, and the inner support mechanism and the outer pressure mechanism are controlled to move with the laser welding head at a welding speed and in a welding direction to clamp and fix the two welding plates.

6. The box-type structure welding method according to claim 3, characterized in that: The method of adsorbing one of the bent plates by an external adsorption mechanism and fixing the bent plate with its opening facing upward in a preliminary assembly position as a lower bent plate includes: Transporting the bent sheet with the opening facing upward to a welding station below a gantry with a laser cutting head; Adjust the bent plate so that the center line of both ends of the bent plate in the length direction corresponds to the track of the gantry; The external adsorption mechanism is controlled to adsorb and fix the bent plate as a lower bent plate.

7. The box-type structure welding method according to any one of claims 1 to 6, characterized in that: The operation of performing width margin cutting on the welding edges of the two bent plates based on the welding gap between the two bent plates comprises: A laser cutting head is used to cut the two bent plates, and the cutting straight lines of the first and last sections during the cutting process are parallel to the center line of the box-shaped structure.

8. The box-type structure welding method according to any one of claims 1 to 6, characterized in that: The cutting width of the welding edge is less than half of the width margin.

9. The box-type structure welding method according to any one of claims 1 to 6, characterized in that: Providing two target plates includes: Determine the initial cutting parameters based on the lofted expansion size and width allowance; The initial plate is cut according to the preliminary cutting parameters to obtain the two target plates.

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