Sheet metal forming welding device and forming welding method

Abstract

This invention relates to a sheet metal forming and welding apparatus and method. The sheet metal forming and welding apparatus includes: an upper die base and a lower die base arranged opposite to each other; the upper die base is provided with a bending punch; the lower die base is provided with a bending station and a bending die; the bending station is arranged opposite to the bending punch; the bending die is arranged on the four sides of the bending station and is higher than the plane on which the bending station is located. The solution provided in this application can quickly and accurately bend thin metal sheets into square box-shaped sheet metal parts in one operation during the processing and production of such parts. After bending, multi-point spot welding can be performed simultaneously, effectively reducing labor intensity, saving costs, improving production efficiency, and accelerating the automation process. Furthermore, by combining bending and spot welding, space and time are greatly saved.

Description

Technical Field

[0001] This application relates to the field of sheet metal processing technology, and in particular to a sheet metal forming and welding device and a forming and welding method. Background Technology

[0002] Sheet metal processing is a comprehensive cold working process for thin metal sheets (parts), including shearing, punching / cutting / combined cutting, bending, welding, riveting, splicing and forming; products processed by sheet metal processing are called sheet metal parts.

[0003] Currently, the main processing steps for precision sheet metal parts include: blanking, bending, spot welding, assembly, and packaging. Specifically, after the sheet metal (parts) is blanked, it is bent into shape according to the required dimensions. Then, spot welding is used to weld the overlapping joints of the sheet metal (parts). After welding, subsequent assembly and packaging are carried out to complete the production of sheet metal parts.

[0004] In the process of sheet metal processing and production, due to the complex structure of square box-type sheet metal parts (i.e., a pentahedron with one less face), bending requires bending a flat metal sheet to add four sides, and welding is required at the overlapping welding points of the four newly added sides. In the existing technology, there are two welding methods: The first is manual spot welding. Specifically, when the worker uses spot welding equipment, the overlapping welding points of the four sides of the metal sheet (part) (i.e., the four corners of the square box) need to be welded. After welding each corner, the metal sheet (part) needs to be rotated to the next corner and spot welded again. A total of four repetitions are required to complete the welding of a sheet metal part. This processing method results in high labor intensity for workers, low efficiency, and poor welding quality consistency. To reduce the labor intensity of manual labor, a second method can be adopted: spot welding is performed by replacing manual operation with a robotic arm and a rotary positioning fixture. Specifically, the robotic arm welds the four corners of the metal sheet (part). After each corner is welded, the rotary positioning fixture automatically rotates the metal sheet (part) to the next corner. This also requires four repetitions to complete the welding of a sheet metal part. Moreover, this processing method requires the investment of rotary positioning fixtures that are compatible with the robotic arm, which has a high investment cost, is difficult to debug, and has low efficiency.

[0005] Therefore, there is an urgent need to design a sheet metal forming and welding device that can quickly and accurately bend thin metal sheets (parts) into square box-shaped sheet metal parts in one go during the processing and production of square box-shaped sheet metal parts. After bending and forming, it can perform multi-point spot welding at the same time, effectively reducing labor intensity, saving costs, saving space and time, improving production efficiency, and accelerating the automation process. Summary of the Invention

[0006] To overcome the problems existing in related technologies, this application provides a sheet metal forming and welding device and a forming and welding method. The sheet metal forming and welding device and the forming and welding method can quickly and accurately bend thin metal sheets into square box-shaped sheet metal parts in one go. After bending and forming, multi-point spot welding can be performed simultaneously, which can effectively reduce labor intensity, save costs, save space and time, improve production efficiency, and accelerate the automation process.

[0007] The first aspect of this application provides a sheet metal forming and welding apparatus, including an upper die base and a lower die base arranged opposite to each other. The upper die base is provided with a bending punch; the lower die base is provided with a bending station and a bending die; the bending station is arranged opposite to the bending punch; the bending die is arranged on the four sides of the bending station and is higher than the plane on which the bending station is located.

[0008] In one embodiment, the bending die includes a first bending die, a second bending die, a third bending die, and a fourth bending die; the first bending die and the second bending die are disposed opposite each other on both sides of the bending station, and the length direction of the first bending die is parallel to the length direction of the second bending die; the third bending die and the fourth bending die are disposed opposite each other on both sides of the bending station, and the length direction of the third bending die is parallel to the length direction of the fourth bending die; the length directions of the first bending die and the second bending die are perpendicular to the length directions of the third bending die and the fourth bending die.

[0009] In one embodiment, the heights of the first bending die and the second bending die are greater than the heights of the third bending die and the fourth bending die.

[0010] In one embodiment, the system further includes a spot welding mechanism; the upper mold base also includes an upper electrode fixing block; the lower mold base also includes a lower electrode fixing block; the upper electrode fixing block and the lower electrode fixing block are respectively connected to the spot welding mechanism.

[0011] In one embodiment, a wedge mechanism is also included for moving the lower electrode fixing block.

[0012] In one embodiment, the wedge mechanism includes a wedge and a slider moving assembly; the wedge is disposed on the upper mold base; the slider moving assembly is disposed opposite to the lower mold base; and the lower electrode fixing block is disposed on the slider moving assembly.

[0013] In one embodiment, the slider moving assembly includes a linear slide rail, a stop block, a pull rod, and a spring; the stop block is fixedly disposed at one end of the linear slide rail; the spring is sleeved on the pull rod; the pull rod passes through the stop block and is connected to the slider on the linear slide rail; the slider is connected to the lower electrode fixing block.

[0014] In one embodiment, the upper mold base is further provided with a guide sleeve; the lower mold base is further provided with a guide post adapted to the guide sleeve.

[0015] In one embodiment, the upper mold base and / or the lower mold base are provided with a limiting block, which is used to limit the position of the upper mold base when it runs toward the lower mold base.

[0016] In one embodiment, the lower die base is further provided with a positioning block and / or a positioning post; the positioning block and / or positioning post are arranged around the bending station.

[0017] The second aspect of this application provides a sheet metal forming and welding method, implemented based on the aforementioned sheet metal forming and welding apparatus, the specific steps of which include:

[0018] S1. The upper die holder moves toward the lower die holder, and the bending punch and the bending die cooperate with each other to bend the metal sheet into shape.

[0019] S2. The wedge mechanism drives the lower electrode fixing block to move to the overlapping welding point of the metal sheet;

[0020] S3. The upper and lower electrodes are connected to perform spot welding at the overlapping welding point of the metal sheet.

[0021] S4. After welding is completed, the upper mold base moves away from the lower mold base;

[0022] S5. Repeat steps S1-S4.

[0023] The technical solution provided in this application may include the following beneficial effects: When processing and generating square box-shaped sheet metal parts, after the metal sheet (part) is blanked, it is placed on the bending station on the lower die base. Since the bending die is set on the four sides of the bending station and is higher than the plane where the bending station is located, the bending die and the plane where the bending station is located can form a groove, so that the four sides of the metal sheet (part) are placed on the bending die, and the middle area of ​​the metal sheet (part) is in a suspended state. At this time, the upper die base moves toward the lower die base, driving the bending punch toward the bending station. When the bending punch contacts the metal sheet (part), it applies downward pressure to the metal sheet (part). At the same time, the bending die applies an upward reaction force to the metal sheet (part). Under the cooperation of these two forces, the four sides of the metal sheet (part) can be bent by 90 degrees to obtain four side surfaces. Compared with the prior art of bending each side surface sequentially, the solution of this application can simultaneously bend the four sides of the metal sheet (part) by 90 degrees to obtain four side surfaces, forming them in one step. This allows for the rapid and precise bending of the metal sheet into a square box-like sheet metal part, effectively improving efficiency, reducing manual labor intensity, and saving time.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0025] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0026] Figure 1 This is a schematic diagram of the sheet metal forming and welding device shown in the embodiments of this application.

[0027] Figure label:

[0028] 1. Upper die base; 11. Bending punch; 12. Upper electrode fixing block; 13. Guide sleeve; 2. Lower die base; 21. Bending station; 23. Lower electrode fixing block; 24. Guide post; 25. Limiting block; 28. Pad; 3. Spot welding mechanism; 31. Switch knob; 32. Current adjustment knob; 33. Time adjustment knob; 34. Connecting wire; 41. Wedge; 411. Wedge fixing block; 421. Linear slide rail; 422. Stop block; 423. Pull rod; 424. Spring; 425. Slider. Detailed Implementation

[0029] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0030] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0031] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] Currently, in the process of sheet metal processing and production, due to the complex structure of square box-type sheet metal parts (i.e., a pentahedron with one less face), bending requires bending one side of the thin metal sheet to add four faces. The general operation is to bend the four faces one by one, which requires bending four times. This method is not only labor-intensive but also inefficient.

[0033] To address the aforementioned issues, this application provides a sheet metal forming and welding device that can simultaneously bend all four sides of a thin metal sheet (part) by 90 degrees for one-time forming. This allows for the rapid and precise bending of the thin metal sheet into a square box-like sheet metal part, effectively improving efficiency, reducing manual labor intensity, and saving time.

[0034] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0035] Example 1

[0036] Please see Figure 1 , Figure 1 This is a schematic diagram of the sheet metal forming and welding device shown in the embodiments of this application.

[0037] This application discloses a sheet metal forming and welding device, which includes an upper mold base 1 and a lower mold base 2 arranged opposite to each other.

[0038] The upper die base 1 is provided with a bending punch 11, which is square in shape and its size is exactly the same as the bottom surface of the final square box-shaped sheet metal part. When the bending punch 11 contacts the metal sheet (part), it positions and presses down the metal sheet (part) to form the bottom surface of the sheet metal part. The lower die base 2 is provided with a bending station 21 and a bending die. The bending station 21 is opposite to the bending punch 11 and is used to place the metal sheet (part). Specifically, the lower die base 2 is provided with a pad 28, which is parallel to... A flat plate with a horizontal surface has a bending station 21 on the pad 28 to ensure that the bottom surface of the bent sheet metal part is parallel to the horizontal surface. The bending die is set on the four sides of the bending station 21 and is higher than the plane where the bending station 21 is located, so that the bending die and the plane where the bending station 21 is located can form a groove. In order to facilitate the quick positioning and placement of the metal sheet (part), the lower die base 2 is also provided with positioning blocks and / or positioning posts, which are set around the bending station 21.

[0039] The bending die includes a first bending die and a second bending die with identical structures, as well as a third bending die and a fourth bending die with identical structures. The first bending die and the second bending die are arranged opposite each other on both sides of the bending station 21, and the length direction of the first bending die is parallel to the length direction of the second bending die. The third bending die and the fourth bending die are arranged opposite each other on both sides of the bending station 21, and the length direction of the third bending die is parallel to the length direction of the fourth bending die. The length directions of the first bending die and the second bending die are perpendicular to the length directions of the third bending die and the fourth bending die, so that the four newly added sides after bending and the original bottom surface can form a square box (i.e., a pentahedron with one less face) type sheet metal part.

[0040] Because the metal sheet (part) has connecting flanges for welding (i.e., the overlapping welding points of the metal sheet after forming), these connecting flanges are placed on the third and fourth bending dies. To ensure that the connecting flanges are on the outer side after bending, the heights of the first and second bending dies are greater than the heights of the third and fourth bending dies. Thus, when the bending punch 11 presses down on the metal sheet (part), the first and second bending dies will first exert a reaction force on the metal sheet (part). This causes the metal sheet (part) located on the first and second bending dies to bend upwards first. The bending punch 11 continues to press down on the metal sheet (part) until it abuts against the third and fourth bending dies. At this time, the metal sheet (part) is bent upwards by the reaction force applied by the third and fourth bending dies. By setting different heights of the bending dies, the bending sequence of the metal sheet can be adjusted, thereby ensuring that the connecting folded edge is located on the outer side, preventing the adjacent sides from tilting outwards and improving the stability of the square box-shaped sheet metal parts. It should be noted that the outer side is the side away from the center line of the metal sheet.

[0041] To ensure the accuracy of the movement of the upper mold base 1 toward the lower mold base 2 (i.e., downward movement), the upper mold base 1 is also provided with a guide sleeve 13; the lower mold base 2 is also provided with a guide post 24 adapted to the guide sleeve 13. When the upper mold base 1 moves toward the lower mold base 2, the guide sleeve 13 is fitted onto the guide post 24. To prevent damage caused by excessive downward movement of the upper mold base 1, the upper mold base 1 and / or the lower mold base 2 are provided with a limiting block 25, which is used to limit the position of the upper mold base 1 when moving toward the lower mold base 2.

[0042] In this first embodiment, when processing and generating square box-shaped sheet metal parts, after the metal sheet (part) is cut, it is placed on the bending station on the lower die base. Since the bending die is located on the four sides of the bending station and is higher than the plane of the bending station, the bending die and the plane of the bending station can form a groove, allowing the four sides of the metal sheet (part) to rest on the bending die. The middle area of ​​the metal sheet (part) is suspended. At this time, the upper die base moves towards the lower die base, driving the bending punch towards the bending station. When the bending punch contacts... When bending a metal sheet (part), a downward pressure is applied to the sheet, while the bending die applies an upward reaction force. The combined effect of these two forces allows the sheet to bend 90 degrees on all four sides, resulting in four side surfaces. Compared to the existing method of bending each side sequentially, this invention allows for simultaneous 90-degree bending of all four sides of the sheet, forming it in one step. This enables rapid and precise bending of the sheet into a square box-like sheet metal part, effectively improving efficiency, reducing manual labor, and saving time.

[0043] Example 2

[0044] Currently, in the production and processing of square box-shaped sheet metal parts, after the metal sheet (part) is bent into shape, the overlapping welding points on the four sides need to be spot welded and fixed. In the existing technology, whether it is manual welding or welding is carried out by a combination of robotic arms and rotary positioning fixtures, the bent metal sheet (part) needs to be rotated 4 times and welded 4 times. In this process, the steps are cumbersome, inefficient and not conducive to automated production.

[0045] To address the aforementioned problems, this application proposes corresponding solutions, please refer to [link / reference]. Figure 1 Specifically:

[0046] Based on the structure of the above embodiment 1, the upper mold base 1 further includes an upper electrode fixing block 12, and the lower mold base 2 further includes a lower electrode fixing block 23. The upper electrode is fixed at the corner of the bending punch 11 by the upper electrode fixing block 12, so that after the metal sheet is bent and formed, the upper electrode can contact the inner side of the overlapping weld joint of the metal sheet. The lower electrode fixing block 23 is disposed opposite to the outer side of the overlapping weld joint and is used to fix the lower electrode. In order to prevent safety hazards caused by electrode leakage, the upper electrode fixing block 12 and the lower electrode fixing block 23 are respectively provided with insulating plates, which are made of insulating material.

[0047] The sheet metal forming and welding device of this application further includes a wedge mechanism and a spot welding mechanism 3. The wedge mechanism is used to move the lower electrode fixing block 23. Specifically, the wedge mechanism includes a wedge 41 and a slider moving assembly. The wedge 41 is disposed on the upper mold base 1. The slider moving assembly is disposed opposite to the lower mold base 2, and the lower electrode fixing block 23 is disposed on the slider moving assembly. Specifically, the wedge 41 is fixed on the upper mold base 1 by the wedge fixing block 411. The slider moving assembly includes a linear slide rail 421, a stop block 422, a pull rod 423, and a spring 424. The linear slide rail 421 is disposed on the pad 28, and the stop block 422 is fixedly disposed at one end of the linear slide rail 421. The spring 424 is sleeved on the pull rod 423. The pull rod 423 passes through the spring 424 and then through the stop block 422 to connect with the slider 425 on the linear slide rail 421. 25 is connected to the lower electrode fixing block 23; when the upper mold base 1 drives the wedge 41 to move towards the lower mold base 2, the wedge 41 is inserted between the baffle and the slider 425. Since the baffle is fixed, the slider 425 drives the lower electrode fixing block 23 to move inward, so that the lower electrode fixing block 23 moves to the outer side of the overlapping welding point of the metal sheet (part), thereby enabling the lower electrode to contact the outer side of the overlapping welding point (i.e., the welding point). Compared with the method of directly setting the lower electrode fixing block 23 at the welding point, which may cause scratches due to friction between the surface of the metal sheet and the lower electrode, thus creating quality problems, by using the slider 425 to drive the lower electrode fixing block 23 to the welding point, the starting time of spot welding can be effectively controlled, and the problem of scratches due to friction between the surface of the metal sheet and the lower electrode can be effectively prevented, further improving the quality of the finished sheet metal parts.

[0048] When the wedge 41 is inserted between the baffle and the slider 425, the slider 425 drives the pull rod 423 to move inward in sync. The spring 424 is compressed under the movement of the pull rod 423. When the wedge 41 moves away from the lower mold base 2 under the drive of the upper mold base 1, the pull rod 423 moves outward under the rebound force of the spring 424, driving the slider 425 to move outward in sync until the pull rod 423 and the slider 425 return to their original positions.

[0049] The spot welding mechanism 3 includes control knobs and connecting lines 34. The control knobs include a switch knob 31, a current adjustment knob 32, and a time adjustment knob 33. The switch knob 31 is used to control the start and stop of the spot welding mechanism 3. The current adjustment knob 32 and the time adjustment knob 33 are used to adjust the current parameters and time parameters of the spot welding mechanism 3, respectively. There are two connecting lines 34. The upper electrode fixing block 12 and the lower electrode fixing block 23 are respectively connected to the spot welding mechanism 3 through the connecting lines 34. More specifically, the upper electrode and the lower electrode are respectively connected to the spot welding mechanism 3 through the connecting lines 34.

[0050] In order to simultaneously perform spot welding operations on the formed square box-shaped metal sheet (parts), four of each of the upper electrode fixing block 12, the lower electrode fixing block 23, the wedge mechanism and the spot welding mechanism 3 are provided. The specific arrangement is as described above and will not be repeated here.

[0051] It should be noted that the outer side is the side away from the center line of the metal sheet, and the inner side is the side facing the center line of the metal sheet.

[0052] In this embodiment, after the metal sheet (part) is bent and formed, it is fixed by resistance spot welding. Specifically, the upper mold base moves the upper electrode fixing plate toward the lower mold base. After forming, the upper electrode is in contact with the inner side (i.e., the weld point) of the overlapping weld point of the metal sheet. The lower electrode, driven by the wedge mechanism, is in contact with the outer side (i.e., the weld point) of the overlapping weld point. After the upper electrode and the lower electrode are connected, the resistance heat generated by the current flowing through the overlapping weld point is used to weld and fix the overlapping weld point. By using resistance spot welding technology, four upper electrode fixing blocks, four lower electrode fixing blocks, four wedge mechanisms, and four spot welding mechanisms can be set. This allows for simultaneous spot welding of the overlapping weld points of the metal sheet (part), greatly improving efficiency. It eliminates the need to rotate the metal sheet (part), reducing manual labor intensity. Moreover, combining the bending and welding of the metal sheet (part) effectively saves space and time, reduces costs, and further accelerates the process of automated production.

[0053] Example 3

[0054] This application also provides a sheet metal forming and welding method, based on the above-mentioned sheet metal forming and welding device, the specific steps of which include:

[0055] S1. The upper die holder moves toward the lower die holder, and the bending punch and the bending die cooperate with each other to bend the metal sheet into shape.

[0056] S2. The wedge mechanism drives the lower electrode fixing block to move to the overlapping welding point of the metal sheet;

[0057] S3. The upper and lower electrodes are connected to perform spot welding at the overlapping welding point of the metal sheet.

[0058] S4. After welding is completed, the upper mold base moves away from the lower mold base;

[0059] S5. Repeat steps S1-S4.

[0060] Before step S1, the metal sheet (part) can be placed on the bending station 21 by a worker or robot, the power supply and spot welding mechanism 3 are turned on, and the current adjustment knob 32 and time adjustment knob 33 are adjusted to appropriate parameters. Then, the upper die 1 moves toward the lower die 2 (i.e., moves downward). After the bending punch 11 contacts the metal sheet (part), it continues to move downward, applying downward pressure to the metal sheet. The first bending die and the second bending die first apply a reaction force to the metal sheet, causing the metal sheet to bend upward by 90 degrees to form two sides. Then, as the metal sheet (part) moves downward, the third bending die and the fourth bending die apply a reaction force to the metal sheet, forming two more sides. The surface formed by the bending punch 11 is the bottom surface, until it is blocked by the limit block 25, at which point the upper die 1 stops running. At this time, the metal sheet is integrally bent into a square box-like sheet metal part shape, and the upper electrode is located on the inner side of the overlapping welding point of the metal sheet.

[0061] In step S2, when the upper mold base 1 moves toward the lower mold base 2 (i.e., moves downward), it will simultaneously drive the wedge 41 to move downward until the wedge 41 inserts between the baffle and the slider 425, pushing the slider 425 to move inward, driving the pull rod 423 and the motor fixing block to move inward, so that the lower electrode can contact the outer side of the overlapping welding point of the metal sheet and be in a position directly opposite the upper electrode. At this time, the spring 424 is in a compressed state.

[0062] In step S3, after the upper electrode and the lower electrode are connected, the overlapping welding point of the metal sheet sandwiched between them is spot welded by the upper electrode and the lower electrode to form a weld point.

[0063] In step S4, after welding is completed, the spot welding mechanism 3 is closed, the upper mold base 1 moves away from the lower mold base 2 (i.e., moves upward), driving the wedge 41 and bending punch 11 to move upward, the spring 424 returns to its original position, driving the pull rod 423, slider 425 and lower electrode fixing block 23 to move outward, the lower electrode and the overlapping welding point of the metal sheet are disconnected until the upper mold base 1 and the wedge mechanism return to their initial positions, and then the metal sheet is removed by the worker or robot, and the processing of the square box-type sheet metal part is completed.

[0064] In this embodiment, the bending and forming process of metal sheet (part) is combined with the welding process. The entire process can be completed without the need for staff intervention, or staff can simply place or remove the metal sheet (part). This greatly reduces the labor intensity of staff, effectively saves space and time, reduces costs, and further accelerates the process of automated production.

[0065] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated further here.

[0066] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different emphases; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0067] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A sheet metal forming and welding device, comprising an upper mold base (1) and a lower mold base (2) disposed opposite to each other, characterized in that: The upper die holder (1) is provided with a bending punch (11); The lower die base (2) is provided with a bending station (21) and a bending die; The bending station (21) is arranged opposite to the bending punch (11); The bending die is arranged on the four sides of the bending station (21) and is higher than the plane where the bending station (21) is located; The bending die includes a first bending die (221), a second bending die (222), a third bending die (223), and a fourth bending die (224); The first bending die (221) and the second bending die (222) are arranged opposite to each other on both sides of the bending station (21), and the length direction of the first bending die (221) is parallel to the length direction of the second bending die (222); The third bending die (223) and the fourth bending die (224) are arranged opposite to each other on both sides of the bending station (21), and the length direction of the third bending die (223) is parallel to the length direction of the fourth bending die (224); The first bending die (221) and the second bending die (222) are perpendicular to the length direction of the third bending die (223) and the fourth bending die (224); The heights of the first bending die (221) and the second bending die (222) are greater than the heights of the third bending die (223) and the fourth bending die (224); It also includes a spot welding mechanism (3); The upper mold base (1) also includes an upper electrode fixing block (12); The lower mold base (2) also includes a lower electrode fixing block (23); The upper electrode fixing block (12) and the lower electrode fixing block (23) are respectively connected to the spot welding mechanism (3); It also includes a wedge mechanism (4), which is used to move the lower electrode fixing block (23); the wedge mechanism (4) includes a wedge (41) and a slider (425) moving assembly; the wedge (41) is disposed on the upper mold base (1); the slider (425) moving assembly is disposed opposite to the lower mold base (2); the lower electrode fixing block (23) is disposed on the slider (425) moving assembly; Sheet metal forming and welding methods include: S1. The upper die holder moves toward the lower die holder, and the bending punch and the bending die cooperate with each other to bend the metal sheet into shape. S2. The wedge mechanism drives the lower electrode fixing block to move to the overlapping welding point of the metal sheet; S3. The upper and lower electrodes are connected to perform spot welding at the overlapping welding point of the metal sheet. S4. After welding is completed, the upper mold base moves away from the lower mold base; S5. Repeat steps S1-S4.

2. The sheet metal forming and welding device according to claim 1, characterized in that: The slider (425) moving assembly includes a linear slide rail (421), a stop (422), a pull rod (423), and a spring (424); The stop block (422) is fixedly disposed at one end of the linear slide rail (421); The spring (424) is sleeved on the pull rod (423); The pull rod (423) passes through the stop (422) and is connected to the slider (425) on the linear slide rail (421); The slider (425) is connected to the lower electrode fixing block (23).

3. The sheet metal forming and welding device according to claim 1, characterized in that: The upper mold base (1) is also provided with a guide sleeve (13); The lower mold base (2) is also provided with a guide post (24) that is adapted to the guide sleeve (13).

4. The sheet metal forming and welding device according to claim 1, characterized in that: The upper mold base (1) and / or the lower mold base (2) are provided with a limiting block (25), which is used to limit the position of the upper mold base (1) when it runs toward the lower mold base (2).

5. The sheet metal forming and welding device according to claim 1, characterized in that: The lower mold base (2) is also provided with a positioning block (26) and / or a positioning post (27); The positioning block (26) and / or positioning post (27) are disposed around the bending station (21).

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