Front beam sub-welding jig set, welding processing method and front longitudinal beam

Abstract

The application relates to a front beam sub-welding jig set, a welding processing method and a front longitudinal beam, which comprises a U-shaped part welding positioning mechanism, a T-shaped part welding positioning mechanism and a reinforcing part welding positioning mechanism; the U-shaped part welding positioning mechanism, the T-shaped part welding positioning mechanism and the reinforcing part welding positioning mechanism are sequentially arranged according to a welding sequence, and coaxial degree restraining devices for restraining the coaxial degree of a shaft sleeve on the T-shaped part and a through hole on the reinforcing part are arranged between the T-shaped part positioning device and the reinforcing part positioning device. Advantages are that the three groups of positioning mechanisms arranged in sequence according to the welding sequence are adopted, front longitudinal beam sub-sequence welding processing is realized, positioning references of all stations are unified, accumulated tolerances generated in multi-process circulation are eliminated, the coaxial degree restraining devices are arranged, the coaxial degree of the shaft sleeve and the through hole of the reinforcing part is restrained, the axial center lines of the two can be completely coincident, the axial center lines of two adjacent through holes can be parallel, the axial center lines of the shaft sleeves can be parallel, and assembly precision is improved.

Description

Technical Field

[0001] This invention relates to the field of welding fixtures for off-road vehicle frame components, and particularly to a front beam welding fixture assembly, welding processing method, and front longitudinal beam. Background Technology

[0002] like Figure 2 As shown, off-road vehicles, such as four-wheeled off-road vehicles, include at least a front beam, such as a front longitudinal beam, which serves as a high-strength supporting frame. Currently, welding of the front longitudinal beam involves using a welding positioning fixture to fix the components in place before welding is performed.

[0003] Existing welding positioning fixtures cannot guarantee the coaxiality of the bushing and the through hole, resulting in a high scrap rate for welding the front longitudinal beam. Therefore, there is an urgent need to develop a welding fixture that can completely solve the above technical problems. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a front beam welding fixture assembly, a welding process, and a front longitudinal beam that can solve the aforementioned technical problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions: A front beam welding fixture assembly, the front beam including a U-shaped portion, a T-shaped portion connected to the middle of the U-shaped portion, and a reinforcing portion disposed at a right angle of the T-shaped portion, the front beam welding fixture assembly including: The U-shaped welding positioning mechanism includes a middle tube positioning device and two side tube positioning devices distributed on the side of the middle tube positioning device. The T-shaped welding positioning mechanism includes a first U-shaped positioning device, a transverse tube positioning device, and a longitudinal tube positioning device located between the first U-shaped positioning device and the transverse tube positioning device. The reinforcing part welding positioning mechanism includes a second U-shaped part positioning device, a T-shaped part positioning device, and a reinforcing part positioning device located between the second U-shaped part positioning device and the T-shaped part positioning device; The U-shaped welding positioning mechanism, the T-shaped welding positioning mechanism, and the reinforcing part welding positioning mechanism are arranged sequentially according to the welding sequence, and a coaxiality constraint device is provided between the T-shaped positioning device and the reinforcing part positioning device to constrain the coaxiality of the bushing on the T-shaped part and the through hole on the reinforcing part.

[0006] Furthermore, the intermediate tube positioning device includes a first support base having an intermediate tube positioning groove, and the first support base is located between two positioning members of the intermediate tube. A positioning clamping assembly is provided on the first support base that penetrates the positioning member and clamps the positioning member in the axial direction of the intermediate tube. The intermediate tube positioning device also includes an end clamping assembly that clamps both ends of the intermediate tube.

[0007] Furthermore, the side tube positioning device includes a side tube support base with a side tube positioning groove, a side tube radial pressing assembly on the side tube support base, and an end pressing assembly on the side tube support base that presses against the end of the side tube away from the intermediate tube.

[0008] Furthermore, the transverse tube positioning device includes a second support base with a transverse tube positioning groove, and a transverse tube radial pressing assembly that presses against the transverse tube. The transverse tube positioning device also includes a telescopic transverse tube centering positioning assembly, the telescopic direction of which is perpendicular to the transverse tube. The longitudinal tube positioning device includes a third support base with a longitudinal tube positioning groove, and a longitudinal tube radial pressing assembly that presses against the longitudinal tube.

[0009] Furthermore, there are two sets of the transverse tube centering positioning components, and the longitudinal tube positioning device and the two sets of the transverse tube centering positioning components are arranged in a triangular distribution.

[0010] Furthermore, the middle part of the T-shaped portion has a bent section connected to the longitudinal tube, and the through hole is provided on the bent section; The reinforcing part positioning device includes a fourth support seat that contacts one end of the bent section and a fifth support seat that contacts the other end of the bent section. The coaxiality constraint device includes an intermediate constraint seat located at one end of the bushing and having a constraint telescopic shaft hole, and a movable seat located at the other end of the bushing. A telescopic driver connected to the constraint telescopic shaft is provided on the movable seat. The telescopic driver drives the constraint telescopic shaft to pass through the bushing, the constraint telescopic shaft hole and the through hole in sequence, thereby fixing the axial direction of the bushing relative to the transverse tube.

[0011] Furthermore, the front beam welding fixture assembly also includes a reinforcing plate positioning mechanism disposed inside the second U-shaped positioning device. The reinforcing plate positioning mechanism includes a bottom support and a reinforcing plate clamping device located at least partially above the bottom support.

[0012] Furthermore, a reinforcing locating pin is provided on the bottom support.

[0013] As one application, this application also provides a welding method for a front beam, wherein the welding method employs the aforementioned front beam welding fixture assembly, and the welding method includes the following steps: S1. Prepare the accessories for the U-shaped and T-shaped parts, as well as the reinforcement parts; S2. Position the U-shaped part on the U-shaped part welding positioning mechanism and obtain the U-shaped part by welding; S3. Position the U-shaped part and the T-shaped part accessories on the T-shaped part welding positioning mechanism, then weld the T-shaped part and the U-shaped part while the bushing and the T-shaped part are not welded, to obtain a welded semi-finished product; S4. Position the semi-finished product, the bushing, and the reinforcing part on the T-shaped welding positioning mechanism. Use a coaxiality constraint device to position the bushing on the T-shaped part and the through hole on the reinforcing part coaxially. Then, perform welding of the bushing and the semi-finished product, and welding of the reinforcing part and the semi-finished product to obtain the finished front beam.

[0014] As one application, this application also provides a front longitudinal beam, which is manufactured by welding.

[0015] Compared with existing technologies, the advantages of this application are as follows: This application adopts three sets of positioning mechanisms arranged in sequence according to the welding order to realize the sequential welding processing of the front longitudinal beam, unify the positioning datum of each station, eliminate the cumulative tolerance caused by multiple process flows, and by setting a coaxiality constraint device to constrain the coaxiality of the bushing and the through hole of the reinforcing part, it can ensure that the axis lines of the two are completely coincident and can also ensure that the axis lines of two adjacent through holes are parallel and the axis lines of the bushing are parallel to each other, thereby improving the assembly accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main assembly of the front beam welding fixture assembly of the present invention. Figure 2 This is a schematic front view of the welded finished front longitudinal beam of the present invention; Figure 3 This is a schematic front view of the main assembly of the reinforcing welding positioning mechanism of the present invention; Figure 4 This is an exploded view of the main assembly of the reinforcing welding positioning mechanism of the present invention; Figure 5 This is a top view of the main assembly of the welding positioning mechanism for the reinforcing part of the present invention; Figure 6 This is a schematic front view of the main assembly of the T-shaped welding positioning mechanism of the present invention; Figure 7 This is a top view of the main assembly of the T-shaped welding positioning mechanism of the present invention; Figure 8 This is a schematic diagram of the main assembly of the U-shaped welding positioning mechanism of the present invention; Figure 9 This is a top view of the main assembly of the U-shaped welding positioning mechanism of the present invention.

[0017] In the figure, the components are: U-shaped welding positioning mechanism 1, intermediate tube positioning device 11, first support base 111, intermediate tube positioning groove 1111, positioning component 112, positioning clamping assembly 113, end clamping assembly 114, side tube positioning device 12, side tube support base 121, side tube positioning groove 1211, side tube radial clamping assembly 122, one-end clamping assembly 123; T-shaped welding positioning mechanism 2, first U-shaped positioning device 21, transverse tube positioning device 22, second support base 221, transverse tube positioning groove 2211, transverse tube radial clamping assembly 222, transverse tube centering positioning assembly 223; longitudinal tube positioning device 23, third support base 231, longitudinal tube positioning groove 2311, longitudinal tube radial clamping assembly 232. The components include: bushing pre-positioning assembly 24, pre-positioning driver 241, pre-positioning shaft 242, reinforcing part welding positioning mechanism 3, second U-shaped part positioning device 31, T-shaped part positioning device 32, reinforcing part positioning device 33, fourth support seat 331, fifth support seat 332, coaxiality constraint device 4, intermediate constraint seat 41, constraint telescopic shaft hole 411, moving seat 42, telescopic driver 43, constraint telescopic shaft 44, reinforcing piece positioning mechanism 5, bottom support seat 51, reinforcing piece positioning pin 511, reinforcing piece clamp 52, U-shaped part P1, intermediate tube P11, side tube P12, T-shaped part P2, transverse tube P21, longitudinal tube P22, reinforcing part P3, bending section P31, through hole P311, bushing P4, and reinforcing piece P5. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0019] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0022] Example 1

[0023] In this embodiment, as Figure 2 As shown, the front beam includes a U-shaped part P1 with a U-shaped profile, a T-shaped part P2 connected to the outer side of the middle part of the U-shaped part P1, and a reinforcing part P3 provided at the right angle of the T-shaped part P2. A bushing P4 is to be welded and fixed on the horizontal tube of the T-shaped part P2, and an assembly through hole P311 is opened at the corresponding position of the reinforcing part P3.

[0024] like Figure 1 As shown, the front beam welding fixture assembly provided in this embodiment is used for the step-by-step welding processing of the front beam workpiece. The front beam welding fixture assembly adopts a sequential workstation layout and consists of three parts: a U-shaped welding positioning mechanism 1, a T-shaped welding positioning mechanism 2, and a reinforcing welding positioning mechanism 3. The three parts are arranged sequentially on the tooling table according to the welding process sequence of the front beam to form a step-by-step welding operation unit, ensuring that the positioning reference of each process is consistent before and after, and avoiding the cumulative tolerance caused by multi-process clamping.

[0025] like Figure 8 and Figure 9 As shown, the U-shaped welding positioning mechanism 1 undertakes the assembly and positioning function of each pipe component of the U-shaped part P1. It consists of a middle pipe positioning device 11 and two sets of side pipe positioning devices 12. The two sets of side pipe positioning devices 12 are symmetrically distributed on the left and right sides of the middle pipe positioning device 11, respectively corresponding to the outlines of the middle pipe P11 and the side pipe P12 of the U-shaped part P1.

[0026] like Figure 6 and Figure 7As shown, the T-shaped welding positioning mechanism 2 is responsible for the combined welding positioning of the U-shaped part P1 and the T-shaped part P2 pipe fittings. It includes a first U-shaped part positioning device 21, a transverse pipe positioning device 22 and a longitudinal pipe positioning device 23. The longitudinal pipe positioning device 23 is located between the first U-shaped part positioning device 21 and the transverse pipe positioning device 22. The positioning reference of the first U-shaped part positioning device 21 is consistent with the U-shaped part welding positioning mechanism 1, ensuring that the reference is not deviated after the previous formed workpiece is transferred in.

[0027] like Figures 3-5 As shown, the reinforcement welding positioning mechanism 3 undertakes the final assembly welding positioning process, including the second U-shaped part positioning device 31, the T-shaped part positioning device 32, and the reinforcement part positioning device 33. The reinforcement part positioning device 33 is located between the second U-shaped part positioning device 31 and the T-shaped part positioning device 32. A coaxiality constraint device 4 is also provided between the T-shaped part positioning device 32 and the reinforcement part positioning device 33 to rigidly constrain the coaxiality of the bushing P4 on the T-shaped part P2 and the through hole P311 on the reinforcement part P3, and to counteract the hole position displacement caused by welding heat deformation and other operations.

[0028] Specifically, the intermediate tube positioning device 11 is provided with a first support base 111. The top surface of the first support base 111 is provided with an intermediate tube positioning groove 1111 that matches the curvature of the outer wall of the intermediate tube P11. The intermediate tube P11 is placed in the positioning groove to complete the initial radial positioning. Two lug-shaped positioning parts are prefabricated on the outer wall of the intermediate tube P11. The first support base 111 is exactly between the two positioning parts 112 in the axial direction. A positioning clamping assembly 113 is provided on the first support base 111. The positioning clamping assembly 113 consists of a linear drive cylinder and a positioning pin. The positioning pin can pass through the prefabricated holes of the two positioning parts 112 along the axial direction of the intermediate tube, and clamps the positioning parts 112 in both directions in the axial direction by the driving force of the cylinder. While realizing the axial limitation of the intermediate tube P11, the circumferential rotation of the tube body is simultaneously restricted. To further enhance the fixing effect, the intermediate tube positioning device 11 is also provided with a set of end clamping components 114 at each end of the intermediate tube P11. Each set of end clamping components 114 consists of a lateral clamping block and a driving cylinder, which can clamp the tube wall radially from the side of the tube opening to prevent the tube body from moving radially during the welding process.

[0029] Furthermore, the side tube positioning devices 12 are correspondingly arranged on both sides of the intermediate tube positioning device 11. Each set of side tube positioning devices 12 is equipped with a side tube support seat 121. The top surface of the side tube support seat 121 is provided with a side tube positioning groove 1211 that is adapted to the outer wall of the side tube P12, which is used to support the tube body of the side tube P12 to complete the initial positioning. A side tube radial clamping assembly 122 is provided above the side tube support seat 121. A vertically arranged clamping cylinder is used with a pressure head to clamp the tube body vertically from above, limiting the radial displacement of the side tube. In order to ensure that the butt end faces of the side tube P12 and the intermediate tube P11 are tightly fitted and the weld bevel gap is uniform, the side tube support seat 121 is also provided with a clamping assembly 123 at the end of the side tube P12 away from the intermediate tube P11. The clamping assembly 123 abuts against the end face of the side tube P12, pressing the side tube P12 towards the intermediate tube P11, ensuring the forming quality of the butt weld.

[0030] like Figure 6 and Figure 7 As shown, in the T-shaped welding positioning mechanism 2, the transverse tube positioning device 22 is provided with a second support seat 221. The top surface of the second support seat 221 has a transverse tube positioning groove 2211, which is used to support the transverse tube P21 to complete the initial positioning. A transverse tube radial pressing component 222 is provided above the second support seat 221, which uses a cylinder and a pressing head to press the tube wall radially. To achieve the centering and alignment of the transverse tube, the transverse tube positioning device 22 is also equipped with a telescopic transverse tube centering positioning component 223, whose telescopic direction is perpendicular to the axial direction of the transverse tube P21. It can telescopically extend and retract from the side to abut against the tube wall and finely adjust the transverse position of the transverse tube P21. The longitudinal tube positioning device 23 is provided with a third support seat 231. The top surface of the third support seat 231 has a longitudinal tube positioning groove 2311, and a longitudinal tube radial pressing component 232 is provided above it. The longitudinal tube P22 is fixed by a mechanical pressing head or by a cylinder and a pressing head. In this embodiment, two sets of transverse tube centering positioning components 223 are provided, respectively arranged on both sides of the transverse tube P21. The two sets of transverse tube centering positioning components 223 and the longitudinal tube positioning device 23 are distributed in a triangle. A stable positioning system is formed by three-point constraint, which improves the tube positioning and resistance to welding deformation.

[0031] In addition, such as Figure 6As shown, the T-shaped welding positioning mechanism 2 also includes a bushing pre-positioning component 24. The bushing pre-positioning component 24 is located in the middle area of ​​the transverse tube positioning device 22 and corresponds one-to-one with the bushing mounting points on the transverse tube P21 of the T-shaped part. The bushing pre-positioning component 24 includes a pre-positioning driver 241 and a pre-positioning shaft 242 provided on the pre-positioning driver. The pre-positioning shaft 242 is adapted to the bushing P4. Specifically, in the T-shaped welding process, the bushing is only pre-positioned and aligned by the bushing pre-positioning component 24 and is not welded to the transverse tube P21 temporarily. This helps to calibrate the axial and circumferential positions of the transverse tube P21 and improve the welding position accuracy between the transverse tube P21 and the longitudinal tube P22. The pre-positioning driver 241 can be any one of a screw driver, a motor driver, or a cylinder driver. In this embodiment, a screw driver is preferred as the pre-positioning driver 241.

[0032] In addition, such as Figures 3-5 As shown, in the reinforcing welding positioning mechanism 3, the middle of the T-shaped part P2 is provided with a bent section P31 that connects with the longitudinal tube P22. The through hole P311 is pre-fabricated on the bent section P31. The bushing P4 is to be welded and fixed at the corresponding position of the T-shaped part P2, and the inner hole of the bushing P4 must maintain the designed coaxiality with the through hole P311 of the bent section P31. The reinforcing positioning device 33 is provided with a fourth support 331 and a fifth support 332. The fourth support 331 and the fifth support 332 respectively support the two ends of the bent section P31, and the two-point support ensures that the bent section P31 is placed stably. The coaxiality constraint device 4 consists of an intermediate constraint seat 41 and a movable seat 42. The intermediate constraint seat 41 is fixedly installed on one side of the bushing P4. A constraint telescopic shaft hole 411 is provided on the intermediate constraint seat 41, and the axis of the constraint telescopic shaft hole 411 is completely coincident with the designed coaxial axis. The movable seat 42 is located on the other side of the bushing P4. A telescopic driver 43 is fixedly installed on the movable seat 42, and the output end of the telescopic driver 43 is coaxially connected to the constraint telescopic shaft 44. During operation, the telescopic actuator 43 drives the constraint telescopic shaft 44 to extend forward, passing through the inner hole of the bushing, the constraint telescopic shaft hole 411 of the intermediate constraint seat 41, and the through hole P311 of the bent section in sequence. The three holes are simultaneously inserted by a single mandrel, which rigidly constrains and ensures the coaxiality of the bushing P4 and the through hole P311, while limiting the axial displacement of the bushing P4 to prevent the bushing P4 from shifting during welding. Furthermore, the telescopic actuator 43 can be any one of a screw actuator, a motor actuator, or a cylinder actuator. In this embodiment, a screw actuator is preferred as the telescopic actuator 43 to drive the constraint telescopic shaft 44. In this embodiment, all the components and materials involved can be commercially available in the existing market.

[0033] Furthermore, the front beam welding fixture assembly also includes a reinforcing plate positioning mechanism 5. This mechanism 5 is located within the internal area of ​​the second U-shaped positioning device 31 and is used to position the reinforcing plate P5 welded to the inner side of the U-shaped part P1. The reinforcing plate positioning mechanism 5 includes a horizontally positioned bottom support 51 and a reinforcing plate clamping device 52. The top surface of the bottom support 51 supports the bottom surface of the reinforcing plate P5. The reinforcing plate clamping device 52 is at least partially located above the bottom support 51, and uses a mechanical pressure head or a pneumatic cylinder pressure head to stably press the reinforcing plate P5 onto the surface of the bottom support 51. To achieve rapid and accurate clamping of the reinforcing plate P5, the top surface of the bottom support 51 is also provided with an upwardly protruding reinforcing plate positioning pin 511, which matches and engages with pre-made pin holes on the reinforcing plate P5. Positioning is completed by aligning the workpiece with the pin holes, effectively improving loading and unloading efficiency.

[0034] Example 2

[0035] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in that, for the welding of a front beam in Embodiment 1, this embodiment provides a welding process method for the front beam.

[0036] The front beam welding fixture assembly of Example 1 was used to complete the processing, and the specific steps are as follows.

[0037] S1. Prepare the middle tube P11 and the two side tubes P12 fittings that make up the U-shaped part P1, and prepare the horizontal tube P21 and the vertical tube P22 fittings that make up the T-shaped part P2. At the same time, prepare all welding auxiliary materials such as reinforcing parts, bushings, and reinforcing plates. Check the external dimensions, pre-made hole positions and bevel quality of each workpiece one by one to confirm that they meet the requirements of the design drawings.

[0038] S2. Mount the intermediate tube P11 onto the intermediate tube positioning device 11 of the U-shaped welding positioning mechanism 1, activate the positioning clamping assembly 113 to pass through the positioning piece 112 and complete the axial clamping, and then drive the end clamping assemblies 114 at both ends to clamp the tube openings; then install the two side tubes P12 into the side tube positioning devices 12 on both sides respectively, press the tube body through the side tube radial pressing assembly 122, and make the side tubes P12 and the mating end faces of the intermediate tube P11 fit together; confirm that all tubes are accurately positioned, perform butt joint circumferential welding, and obtain the formed U-shaped part workpiece.

[0039] S3. Transfer the formed U-shaped part P1 to the T-shaped part welding positioning mechanism 2. The main body is positioned by the first U-shaped part positioning device 21 to ensure consistency with the previous reference. Simultaneously, the transverse tube P21 and the longitudinal tube P22 are respectively installed into the transverse tube positioning device 22 and the longitudinal tube positioning device 23. The transverse tube P21 is adjusted to the designed center position by the two sets of transverse tube centering positioning components 223. After confirming that the position is correct, the radial clamping components are activated to lock the tubes. At this time, the bushing P4 is pre-placed in the corresponding installation position of the T-shaped part P2 without welding. The welding operation of the T-shaped part P2 tube and the U-shaped part P1 is performed to obtain the front beam welding semi-finished product.

[0040] S4. Transfer the welded semi-finished product to the reinforcing part welding positioning mechanism 3. The main structure is positioned by the second U-shaped part positioning device 31 and the T-shaped part positioning device 32. Simultaneously, insert the bushing P4 workpiece and the reinforcing part P3 workpiece. Activate the coaxiality constraint device 4. Drive the constraint telescopic shaft 44 through the inner hole of the bushing P4, the constraint telescopic shaft hole 411, and the bending section through hole P311 in sequence by the telescopic driver 43. After completing the coaxial positioning of the bushing P4 and the through hole P311, lock all positioning and clamping components. Sequentially perform welding operations on the bushing P4 and the T-shaped part P2 semi-finished product, the reinforcing part P3 and the semi-finished product, and the reinforcement plate P5 and the inner side of the U-shaped part P1. After all welding is completed, remove the workpiece to obtain the front beam finished product.

[0041] Example 3

[0042] The structure and principle of this embodiment are basically the same as those of Embodiment 1 and Embodiment 2. The difference lies in that this embodiment provides a front longitudinal beam manufactured by the processing method of Embodiment 2.

[0043] The front longitudinal beam provided in this embodiment is manufactured by the welding process of embodiment 2. The welding position accuracy of the U-shaped part P1, T-shaped part P2 and the reinforcing part P3 of the workpiece is stable. The coaxiality of the bushing P4 and the through hole P311 can be stably controlled within the design tolerance range. The overall welding deformation is small, the structural strength is uniform, and the consistency of each assembly part is excellent. It can be directly applied to the automobile frame assembly process.

[0044] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A front beam welding fixture assembly, the front beam comprising a U-shaped portion (P1), a T-shaped portion (P2) connected to the middle of the U-shaped portion (P1), and a reinforcing portion (P3) disposed at a right angle of the T-shaped portion (P2), characterized in that, The front beam welding fixture assembly includes: The U-shaped welding positioning mechanism (1) includes a middle tube positioning device (11) and two side tube positioning devices (12) distributed on the side of the middle tube positioning device (11). The T-shaped welding positioning mechanism (2) includes a first U-shaped positioning device (21), a transverse tube positioning device (22), and a longitudinal tube positioning device (23) located between the first U-shaped positioning device (21) and the transverse tube positioning device (22). The reinforcing part welding positioning mechanism (3) includes a second U-shaped part positioning device (31), a T-shaped part positioning device (32), and a reinforcing part positioning device (33) located between the second U-shaped part positioning device (31) and the T-shaped part positioning device (32). The U-shaped welding positioning mechanism (1), the T-shaped welding positioning mechanism (2) and the reinforcing part welding positioning mechanism (3) are arranged in sequence according to the welding order, and a coaxiality constraint device (4) is provided between the T-shaped positioning device (32) and the reinforcing part positioning device (33) to constrain the coaxiality of the bushing (P4) on the T-shaped part (P2) and the through hole (P311) on the reinforcing part (P3).

2. The front beam welding fixture assembly according to claim 1, characterized in that, The intermediate tube positioning device (11) includes a first support (111) having an intermediate tube positioning groove (1111), and the first support (111) is located between two positioning members (112) of the intermediate tube. A positioning clamping assembly (113) is provided on the first support (111) that passes through the positioning member (112) and clamps the positioning member (112) in the axial direction of the intermediate tube. The intermediate tube positioning device (11) also includes an end clamping assembly (114) clamping both ends of the intermediate tube.

3. The front beam welding fixture assembly according to claim 2, characterized in that, The side tube positioning device (12) includes a side tube support (121) with a side tube positioning groove (1211), a side tube radial pressing assembly (122) is provided on the side tube support (121), and a one-end pressing assembly (123) is provided on the side tube support (121) to press the side tube away from the middle tube.

4. The front beam welding fixture assembly according to claim 1, characterized in that, The transverse tube positioning device (22) includes a second support base (221) with a transverse tube positioning groove (2211) and a transverse tube radial pressing assembly (222) that presses against the transverse tube. The transverse tube positioning device (22) also includes a telescopic transverse tube centering positioning assembly (223), the telescopic direction of which is perpendicular to the transverse tube. The longitudinal tube positioning device (23) includes a third support (231) with a longitudinal tube positioning groove (2311) and a longitudinal tube radial clamping assembly (232) that clamps the longitudinal tube.

5. A front beam welding fixture assembly according to claim 4, characterized in that, There are two sets of the transverse tube centering positioning components (223), and the longitudinal tube positioning device (23) and the two sets of the transverse tube centering positioning components (223) are arranged in a triangle.

6. A front beam welding fixture assembly according to claim 1, characterized in that, The T-shaped portion (P2) has a bent section in the middle that connects to the longitudinal tube, and the through hole (P311) is provided on the bent section. The reinforcing part positioning device (33) includes a fourth support seat (331) that contacts one end of the bent section and a fifth support seat (332) that contacts the other end of the bent section. The coaxiality constraint device (4) includes an intermediate constraint seat (41) located at one end of the bushing (P4) and having a constraint telescopic shaft hole, and a movable seat (42) located at the other end of the bushing (P4). A telescopic driver (43) connected to the constraint telescopic shaft (44) is provided on the movable seat (42). The telescopic driver (43) drives the constraint telescopic shaft (44) to pass through the bushing (P4), the constraint telescopic shaft hole and the through hole (P311) in sequence, thereby fixing the axial direction of the bushing (P4) relative to the transverse tube.

7. A front beam welding fixture assembly according to claim 1, characterized in that, The front beam welding fixture assembly also includes a reinforcing plate positioning mechanism (5) located inside the second U-shaped positioning device (31). The reinforcing plate positioning mechanism (5) includes a bottom support (51) and a reinforcing plate clamp (52) located at least partially above the bottom support (51).

8. A front beam welding fixture assembly according to claim 7, characterized in that, A reinforcing plate positioning pin (511) is provided on the bottom support (51).

9. A welding method for a front beam, wherein the welding method employs a front beam sub-welding fixture assembly as described in any one of claims 1-8, characterized in that, The welding process includes the following steps: S1. Prepare the accessories for the U-shaped part (P1) and the T-shaped part (P2), and prepare the reinforcing part (P3). S2. Position the U-shaped part on the welding positioning mechanism (1) and obtain the U-shaped part (P1) by welding. S3. Position the accessories of the U-shaped part (P1) and the T-shaped part (P2) on the T-shaped part welding positioning mechanism (2), then weld the T-shaped part (P2) and the U-shaped part (P1) while the bushing (P4) and the T-shaped part (P2) are not welded, to obtain a welded semi-finished product; S4. Position the semi-finished product, the bushing (P4), and the reinforcing part (P3) on the T-shaped welding positioning mechanism (2). Use the coaxiality constraint device (4) to position the bushing (P4) on the T-shaped part (P2) and the through hole (P311) on the reinforcing part (P3) coaxially. Then, perform welding of the bushing (P4) and the semi-finished product, and perform welding of the reinforcing part (P3) and the semi-finished product to obtain the front beam finished product.

10. A front longitudinal beam, characterized in that, The front longitudinal beam is manufactured by the welding process described in claim 9.

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